xserver mesa xkeyboard-config git update 30 Apr 2011

1 files changed, 1543 insertions, 1535 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c b/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
index 1707f827c..9cc40c3d9 100644
--- a/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/mesalib/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -1,1535 +1,1543 @@
-/**************************************************************************
- * 
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * All Rights Reserved.
- * 
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- * 
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
- * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- * 
- **************************************************************************/
-
- /*
-  * Authors:
-  *   Brian Paul
-  */
-
-#include "main/imports.h"
-#include "main/image.h"
-#include "main/bufferobj.h"
-#include "main/macros.h"
-#include "main/mfeatures.h"
-#include "main/mtypes.h"
-#include "main/pack.h"
-#include "main/pbo.h"
-#include "main/texformat.h"
-#include "main/texstore.h"
-#include "program/program.h"
-#include "program/prog_print.h"
-#include "program/prog_instruction.h"
-
-#include "st_atom.h"
-#include "st_atom_constbuf.h"
-#include "st_cb_drawpixels.h"
-#include "st_cb_readpixels.h"
-#include "st_cb_fbo.h"
-#include "st_context.h"
-#include "st_debug.h"
-#include "st_format.h"
-#include "st_program.h"
-#include "st_texture.h"
-
-#include "pipe/p_context.h"
-#include "pipe/p_defines.h"
-#include "tgsi/tgsi_ureg.h"
-#include "util/u_draw_quad.h"
-#include "util/u_format.h"
-#include "util/u_inlines.h"
-#include "util/u_math.h"
-#include "util/u_tile.h"
-#include "cso_cache/cso_context.h"
-
-
-#if FEATURE_drawpix
-
-/**
- * Check if the given program is:
- * 0: MOVE result.color, fragment.color;
- * 1: END;
- */
-static GLboolean
-is_passthrough_program(const struct gl_fragment_program *prog)
-{
-   if (prog->Base.NumInstructions == 2) {
-      const struct prog_instruction *inst = prog->Base.Instructions;
-      if (inst[0].Opcode == OPCODE_MOV &&
-          inst[1].Opcode == OPCODE_END &&
-          inst[0].DstReg.File == PROGRAM_OUTPUT &&
-          inst[0].DstReg.Index == FRAG_RESULT_COLOR &&
-          inst[0].DstReg.WriteMask == WRITEMASK_XYZW &&
-          inst[0].SrcReg[0].File == PROGRAM_INPUT &&
-          inst[0].SrcReg[0].Index == FRAG_ATTRIB_COL0 &&
-          inst[0].SrcReg[0].Swizzle == SWIZZLE_XYZW) {
-         return GL_TRUE;
-      }
-   }
-   return GL_FALSE;
-}
-
-
-
-/**
- * Make fragment shader for glDraw/CopyPixels.  This shader is made
- * by combining the pixel transfer shader with the user-defined shader.
- * \param fpIn  the current/incoming fragment program
- * \param fpOut  returns the combined fragment program
- */
-void
-st_make_drawpix_fragment_program(struct st_context *st,
-                                 struct gl_fragment_program *fpIn,
-                                 struct gl_fragment_program **fpOut)
-{
-   struct gl_program *newProg;
-
-   if (is_passthrough_program(fpIn)) {
-      newProg = (struct gl_program *) _mesa_clone_fragment_program(st->ctx,
-                                             &st->pixel_xfer.program->Base);
-   }
-   else {
-#if 0
-      /* debug */
-      printf("Base program:\n");
-      _mesa_print_program(&fpIn->Base);
-      printf("DrawPix program:\n");
-      _mesa_print_program(&st->pixel_xfer.program->Base.Base);
-#endif
-      newProg = _mesa_combine_programs(st->ctx,
-                                       &st->pixel_xfer.program->Base.Base,
-                                       &fpIn->Base);
-   }
-
-#if 0
-   /* debug */
-   printf("Combined DrawPixels program:\n");
-   _mesa_print_program(newProg);
-   printf("InputsRead: 0x%x\n", newProg->InputsRead);
-   printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);
-   _mesa_print_parameter_list(newProg->Parameters);
-#endif
-
-   *fpOut = (struct gl_fragment_program *) newProg;
-}
-
-
-/**
- * Create fragment program that does a TEX() instruction to get a Z and/or
- * stencil value value, then writes to FRAG_RESULT_DEPTH/FRAG_RESULT_STENCIL.
- * Used for glDrawPixels(GL_DEPTH_COMPONENT / GL_STENCIL_INDEX).
- * Pass fragment color through as-is.
- * \return pointer to the gl_fragment program
- */
-struct gl_fragment_program *
-st_make_drawpix_z_stencil_program(struct st_context *st,
-                                  GLboolean write_depth,
-                                  GLboolean write_stencil)
-{
-   struct gl_context *ctx = st->ctx;
-   struct gl_program *p;
-   struct gl_fragment_program *fp;
-   GLuint ic = 0;
-   const GLuint shaderIndex = write_depth * 2 + write_stencil;
-
-   assert(shaderIndex < Elements(st->drawpix.shaders));
-
-   if (st->drawpix.shaders[shaderIndex]) {
-      /* already have the proper shader */
-      return st->drawpix.shaders[shaderIndex];
-   }
-
-   /*
-    * Create shader now
-    */
-   p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
-   if (!p)
-      return NULL;
-
-   p->NumInstructions = write_depth ? 2 : 1;
-   p->NumInstructions += write_stencil ? 1 : 0;
-
-   p->Instructions = _mesa_alloc_instructions(p->NumInstructions);
-   if (!p->Instructions) {
-      ctx->Driver.DeleteProgram(ctx, p);
-      return NULL;
-   }
-   _mesa_init_instructions(p->Instructions, p->NumInstructions);
-
-   if (write_depth) {
-      /* TEX result.depth, fragment.texcoord[0], texture[0], 2D; */
-      p->Instructions[ic].Opcode = OPCODE_TEX;
-      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
-      p->Instructions[ic].DstReg.Index = FRAG_RESULT_DEPTH;
-      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Z;
-      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
-      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
-      p->Instructions[ic].TexSrcUnit = 0;
-      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
-      ic++;
-   }
-
-   if (write_stencil) {
-      /* TEX result.stencil, fragment.texcoord[0], texture[0], 2D; */
-      p->Instructions[ic].Opcode = OPCODE_TEX;
-      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
-      p->Instructions[ic].DstReg.Index = FRAG_RESULT_STENCIL;
-      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Y;
-      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
-      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
-      p->Instructions[ic].TexSrcUnit = 1;
-      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
-      ic++;
-   }
-
-   /* END; */
-   p->Instructions[ic++].Opcode = OPCODE_END;
-
-   assert(ic == p->NumInstructions);
-
-   p->InputsRead = FRAG_BIT_TEX0 | FRAG_BIT_COL0;
-   p->OutputsWritten = 0;
-   if (write_depth)
-      p->OutputsWritten |= BITFIELD64_BIT(FRAG_RESULT_DEPTH);
-   if (write_stencil)
-      p->OutputsWritten |= BITFIELD64_BIT(FRAG_RESULT_STENCIL);
-
-   p->SamplersUsed =  0x1;  /* sampler 0 (bit 0) is used */
-   if (write_stencil)
-      p->SamplersUsed |= 1 << 1;
-
-   fp = (struct gl_fragment_program *) p;
-
-   /* save the new shader */
-   st->drawpix.shaders[shaderIndex] = fp;
-
-   return fp;
-}
-
-
-/**
- * Create a simple vertex shader that just passes through the
- * vertex position and texcoord (and optionally, color).
- */
-static void *
-make_passthrough_vertex_shader(struct st_context *st, 
-                               GLboolean passColor)
-{
-   if (!st->drawpix.vert_shaders[passColor]) {
-      struct ureg_program *ureg = ureg_create( TGSI_PROCESSOR_VERTEX );
-
-      if (ureg == NULL)
-         return NULL;
-
-      /* MOV result.pos, vertex.pos; */
-      ureg_MOV(ureg, 
-               ureg_DECL_output( ureg, TGSI_SEMANTIC_POSITION, 0 ),
-               ureg_DECL_vs_input( ureg, 0 ));
-      
-      /* MOV result.texcoord0, vertex.attr[1]; */
-      ureg_MOV(ureg, 
-               ureg_DECL_output( ureg, TGSI_SEMANTIC_GENERIC, 0 ),
-               ureg_DECL_vs_input( ureg, 1 ));
-      
-      if (passColor) {
-         /* MOV result.color0, vertex.attr[2]; */
-         ureg_MOV(ureg, 
-                  ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, 0 ),
-                  ureg_DECL_vs_input( ureg, 2 ));
-      }
-
-      ureg_END( ureg );
-      
-      st->drawpix.vert_shaders[passColor] = 
-         ureg_create_shader_and_destroy( ureg, st->pipe );
-   }
-
-   return st->drawpix.vert_shaders[passColor];
-}
-
-
-/**
- * Return a texture base format for drawing/copying an image
- * of the given format.
- */
-static GLenum
-base_format(GLenum format)
-{
-   switch (format) {
-   case GL_DEPTH_COMPONENT:
-      return GL_DEPTH_COMPONENT;
-   case GL_DEPTH_STENCIL:
-      return GL_DEPTH_STENCIL;
-   case GL_STENCIL_INDEX:
-      return GL_STENCIL_INDEX;
-   default:
-      return GL_RGBA;
-   }
-}
-
-
-/**
- * Return a texture internalFormat for drawing/copying an image
- * of the given format and type.
- */
-static GLenum
-internal_format(struct gl_context *ctx, GLenum format, GLenum type)
-{
-   switch (format) {
-   case GL_DEPTH_COMPONENT:
-      return GL_DEPTH_COMPONENT;
-   case GL_DEPTH_STENCIL:
-      return GL_DEPTH_STENCIL;
-   case GL_STENCIL_INDEX:
-      return GL_STENCIL_INDEX;
-   default:
-      if (_mesa_is_integer_format(format)) {
-         switch (type) {
-         case GL_BYTE:
-            return GL_RGBA8I;
-         case GL_UNSIGNED_BYTE:
-            return GL_RGBA8UI;
-         case GL_SHORT:
-            return GL_RGBA16I;
-         case GL_UNSIGNED_SHORT:
-            return GL_RGBA16UI;
-         case GL_INT:
-            return GL_RGBA32I;
-         case GL_UNSIGNED_INT:
-            return GL_RGBA32UI;
-         default:
-            assert(0 && "Unexpected type in internal_format()");
-            return GL_RGBA_INTEGER;
-         }
-      }
-      else {
-         switch (type) {
-         case GL_UNSIGNED_BYTE:
-         case GL_UNSIGNED_INT_8_8_8_8:
-         case GL_UNSIGNED_INT_8_8_8_8_REV:
-         default:
-            return GL_RGBA8;
-
-         case GL_UNSIGNED_BYTE_3_3_2:
-         case GL_UNSIGNED_BYTE_2_3_3_REV:
-         case GL_UNSIGNED_SHORT_4_4_4_4:
-         case GL_UNSIGNED_SHORT_4_4_4_4_REV:
-            return GL_RGBA4;
-
-         case GL_UNSIGNED_SHORT_5_6_5:
-         case GL_UNSIGNED_SHORT_5_6_5_REV:
-         case GL_UNSIGNED_SHORT_5_5_5_1:
-         case GL_UNSIGNED_SHORT_1_5_5_5_REV:
-            return GL_RGB5_A1;
-
-         case GL_UNSIGNED_INT_10_10_10_2:
-         case GL_UNSIGNED_INT_2_10_10_10_REV:
-            return GL_RGB10_A2;
-
-         case GL_UNSIGNED_SHORT:
-         case GL_UNSIGNED_INT:
-            return GL_RGBA16;
-
-         case GL_BYTE:
-            return
-               ctx->Extensions.EXT_texture_snorm ? GL_RGBA8_SNORM : GL_RGBA8;
-
-         case GL_SHORT:
-         case GL_INT:
-            return
-               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;
-
-         case GL_HALF_FLOAT_ARB:
-            return
-               ctx->Extensions.ARB_texture_float ? GL_RGBA16F :
-               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;
-
-         case GL_FLOAT:
-         case GL_DOUBLE:
-            return
-               ctx->Extensions.ARB_texture_float ? GL_RGBA32F :
-               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;
-         }
-      }
-   }
-}
-
-
-/**
- * Create a temporary texture to hold an image of the given size.
- * If width, height are not POT and the driver only handles POT textures,
- * allocate the next larger size of texture that is POT.
- */
-static struct pipe_resource *
-alloc_texture(struct st_context *st, GLsizei width, GLsizei height,
-              enum pipe_format texFormat)
-{
-   struct pipe_resource *pt;
-
-   pt = st_texture_create(st, st->internal_target, texFormat, 0,
-                          width, height, 1, 1, PIPE_BIND_SAMPLER_VIEW);
-
-   return pt;
-}
-
-
-/**
- * Make texture containing an image for glDrawPixels image.
- * If 'pixels' is NULL, leave the texture image data undefined.
- */
-static struct pipe_resource *
-make_texture(struct st_context *st,
-	     GLsizei width, GLsizei height, GLenum format, GLenum type,
-	     const struct gl_pixelstore_attrib *unpack,
-	     const GLvoid *pixels)
-{
-   struct gl_context *ctx = st->ctx;
-   struct pipe_context *pipe = st->pipe;
-   gl_format mformat;
-   struct pipe_resource *pt;
-   enum pipe_format pipeFormat;
-   GLuint cpp;
-   GLenum baseFormat, intFormat;
-
-   baseFormat = base_format(format);
-   intFormat = internal_format(ctx, format, type);
-
-   mformat = st_ChooseTextureFormat_renderable(ctx, intFormat,
-                                               format, type, GL_FALSE);
-   assert(mformat);
-
-   pipeFormat = st_mesa_format_to_pipe_format(mformat);
-   assert(pipeFormat);
-   cpp = util_format_get_blocksize(pipeFormat);
-
-   pixels = _mesa_map_pbo_source(ctx, unpack, pixels);
-   if (!pixels)
-      return NULL;
-
-   /* alloc temporary texture */
-   pt = alloc_texture(st, width, height, pipeFormat);
-   if (!pt) {
-      _mesa_unmap_pbo_source(ctx, unpack);
-      return NULL;
-   }
-
-   {
-      struct pipe_transfer *transfer;
-      static const GLuint dstImageOffsets = 0;
-      GLboolean success;
-      GLubyte *dest;
-      const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;
-
-      /* we'll do pixel transfer in a fragment shader */
-      ctx->_ImageTransferState = 0x0;
-
-      transfer = pipe_get_transfer(st->pipe, pt, 0, 0,
-                                   PIPE_TRANSFER_WRITE, 0, 0,
-                                   width, height);
-
-      /* map texture transfer */
-      dest = pipe_transfer_map(pipe, transfer);
-
-
-      /* Put image into texture transfer.
-       * Note that the image is actually going to be upside down in
-       * the texture.  We deal with that with texcoords.
-       */
-      success = _mesa_texstore(ctx, 2,           /* dims */
-                               baseFormat,       /* baseInternalFormat */
-                               mformat,          /* gl_format */
-                               dest,             /* dest */
-                               0, 0, 0,          /* dstX/Y/Zoffset */
-                               transfer->stride, /* dstRowStride, bytes */
-                               &dstImageOffsets, /* dstImageOffsets */
-                               width, height, 1, /* size */
-                               format, type,     /* src format/type */
-                               pixels,           /* data source */
-                               unpack);
-
-      /* unmap */
-      pipe_transfer_unmap(pipe, transfer);
-      pipe->transfer_destroy(pipe, transfer);
-
-      assert(success);
-
-      /* restore */
-      ctx->_ImageTransferState = imageTransferStateSave;
-   }
-
-   _mesa_unmap_pbo_source(ctx, unpack);
-
-   return pt;
-}
-
-
-/**
- * Draw quad with texcoords and optional color.
- * Coords are gallium window coords with y=0=top.
- * \param color  may be null
- * \param invertTex  if true, flip texcoords vertically
- */
-static void
-draw_quad(struct gl_context *ctx, GLfloat x0, GLfloat y0, GLfloat z,
-          GLfloat x1, GLfloat y1, const GLfloat *color,
-          GLboolean invertTex, GLfloat maxXcoord, GLfloat maxYcoord)
-{
-   struct st_context *st = st_context(ctx);
-   struct pipe_context *pipe = st->pipe;
-   GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */
-
-   /* setup vertex data */
-   {
-      const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
-      const GLfloat fb_width = (GLfloat) fb->Width;
-      const GLfloat fb_height = (GLfloat) fb->Height;
-      const GLfloat clip_x0 = x0 / fb_width * 2.0f - 1.0f;
-      const GLfloat clip_y0 = y0 / fb_height * 2.0f - 1.0f;
-      const GLfloat clip_x1 = x1 / fb_width * 2.0f - 1.0f;
-      const GLfloat clip_y1 = y1 / fb_height * 2.0f - 1.0f;
-      const GLfloat sLeft = 0.0f, sRight = maxXcoord;
-      const GLfloat tTop = invertTex ? maxYcoord : 0.0f;
-      const GLfloat tBot = invertTex ? 0.0f : maxYcoord;
-      GLuint i;
-
-      /* upper-left */
-      verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */
-      verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */
-
-      /* upper-right */
-      verts[1][0][0] = clip_x1;
-      verts[1][0][1] = clip_y0;
-
-      /* lower-right */
-      verts[2][0][0] = clip_x1;
-      verts[2][0][1] = clip_y1;
-
-      /* lower-left */
-      verts[3][0][0] = clip_x0;
-      verts[3][0][1] = clip_y1;
-
-      verts[0][1][0] = sLeft; /* v[0].attr[1].S */
-      verts[0][1][1] = tTop;  /* v[0].attr[1].T */
-      verts[1][1][0] = sRight;
-      verts[1][1][1] = tTop;
-      verts[2][1][0] = sRight;
-      verts[2][1][1] = tBot;
-      verts[3][1][0] = sLeft;
-      verts[3][1][1] = tBot;
-
-      /* same for all verts: */
-      if (color) {
-         for (i = 0; i < 4; i++) {
-            verts[i][0][2] = z;         /* v[i].attr[0].z */
-            verts[i][0][3] = 1.0f;      /* v[i].attr[0].w */
-            verts[i][2][0] = color[0];  /* v[i].attr[2].r */
-            verts[i][2][1] = color[1];  /* v[i].attr[2].g */
-            verts[i][2][2] = color[2];  /* v[i].attr[2].b */
-            verts[i][2][3] = color[3];  /* v[i].attr[2].a */
-            verts[i][1][2] = 0.0f;      /* v[i].attr[1].R */
-            verts[i][1][3] = 1.0f;      /* v[i].attr[1].Q */
-         }
-      }
-      else {
-         for (i = 0; i < 4; i++) {
-            verts[i][0][2] = z;    /*Z*/
-            verts[i][0][3] = 1.0f; /*W*/
-            verts[i][1][2] = 0.0f; /*R*/
-            verts[i][1][3] = 1.0f; /*Q*/
-         }
-      }
-   }
-
-   {
-      struct pipe_resource *buf;
-
-      /* allocate/load buffer object with vertex data */
-      buf = pipe_buffer_create(pipe->screen,
-			       PIPE_BIND_VERTEX_BUFFER,
-			       PIPE_USAGE_STATIC,
-                               sizeof(verts));
-      pipe_buffer_write(st->pipe, buf, 0, sizeof(verts), verts);
-
-      util_draw_vertex_buffer(pipe, st->cso_context, buf, 0,
-                              PIPE_PRIM_QUADS,
-                              4,  /* verts */
-                              3); /* attribs/vert */
-      pipe_resource_reference(&buf, NULL);
-   }
-}
-
-
-
-static void
-draw_textured_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,
-                   GLsizei width, GLsizei height,
-                   GLfloat zoomX, GLfloat zoomY,
-                   struct pipe_sampler_view **sv,
-                   int num_sampler_view,
-                   void *driver_vp,
-                   void *driver_fp,
-                   const GLfloat *color,
-                   GLboolean invertTex,
-                   GLboolean write_depth, GLboolean write_stencil)
-{
-   struct st_context *st = st_context(ctx);
-   struct pipe_context *pipe = st->pipe;
-   struct cso_context *cso = st->cso_context;
-   GLfloat x0, y0, x1, y1;
-   GLsizei maxSize;
-   boolean normalized = sv[0]->texture->target != PIPE_TEXTURE_RECT;
-
-   /* limit checks */
-   /* XXX if DrawPixels image is larger than max texture size, break
-    * it up into chunks.
-    */
-   maxSize = 1 << (pipe->screen->get_param(pipe->screen,
-                                        PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
-   assert(width <= maxSize);
-   assert(height <= maxSize);
-
-   cso_save_rasterizer(cso);
-   cso_save_viewport(cso);
-   cso_save_samplers(cso);
-   cso_save_fragment_sampler_views(cso);
-   cso_save_fragment_shader(cso);
-   cso_save_vertex_shader(cso);
-   cso_save_vertex_elements(cso);
-   cso_save_vertex_buffers(cso);
-   if (write_stencil) {
-      cso_save_depth_stencil_alpha(cso);
-      cso_save_blend(cso);
-   }
-
-   /* rasterizer state: just scissor */
-   {
-      struct pipe_rasterizer_state rasterizer;
-      memset(&rasterizer, 0, sizeof(rasterizer));
-      rasterizer.clamp_fragment_color = ctx->Color._ClampFragmentColor;
-      rasterizer.gl_rasterization_rules = 1;
-      rasterizer.scissor = ctx->Scissor.Enabled;
-      cso_set_rasterizer(cso, &rasterizer);
-   }
-
-   if (write_stencil) {
-      /* Stencil writing bypasses the normal fragment pipeline to
-       * disable color writing and set stencil test to always pass.
-       */
-      struct pipe_depth_stencil_alpha_state dsa;
-      struct pipe_blend_state blend;
-
-      /* depth/stencil */
-      memset(&dsa, 0, sizeof(dsa));
-      dsa.stencil[0].enabled = 1;
-      dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
-      dsa.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
-      dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
-      if (write_depth) {
-         /* writing depth+stencil: depth test always passes */
-         dsa.depth.enabled = 1;
-         dsa.depth.writemask = ctx->Depth.Mask;
-         dsa.depth.func = PIPE_FUNC_ALWAYS;
-      }
-      cso_set_depth_stencil_alpha(cso, &dsa);
-
-      /* blend (colormask) */
-      memset(&blend, 0, sizeof(blend));
-      cso_set_blend(cso, &blend);
-   }
-
-   /* fragment shader state: TEX lookup program */
-   cso_set_fragment_shader_handle(cso, driver_fp);
-
-   /* vertex shader state: position + texcoord pass-through */
-   cso_set_vertex_shader_handle(cso, driver_vp);
-
-
-   /* texture sampling state: */
-   {
-      struct pipe_sampler_state sampler;
-      memset(&sampler, 0, sizeof(sampler));
-      sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;
-      sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;
-      sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;
-      sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
-      sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
-      sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
-      sampler.normalized_coords = normalized;
-
-      cso_single_sampler(cso, 0, &sampler);
-      if (num_sampler_view > 1) {
-         cso_single_sampler(cso, 1, &sampler);
-      }
-      cso_single_sampler_done(cso);
-   }
-
-   /* viewport state: viewport matching window dims */
-   {
-      const float w = (float) ctx->DrawBuffer->Width;
-      const float h = (float) ctx->DrawBuffer->Height;
-      struct pipe_viewport_state vp;
-      vp.scale[0] =  0.5f * w;
-      vp.scale[1] = -0.5f * h;
-      vp.scale[2] = 0.5f;
-      vp.scale[3] = 1.0f;
-      vp.translate[0] = 0.5f * w;
-      vp.translate[1] = 0.5f * h;
-      vp.translate[2] = 0.5f;
-      vp.translate[3] = 0.0f;
-      cso_set_viewport(cso, &vp);
-   }
-
-   cso_set_vertex_elements(cso, 3, st->velems_util_draw);
-
-   /* texture state: */
-   cso_set_fragment_sampler_views(cso, num_sampler_view, sv);
-
-   /* Compute Gallium window coords (y=0=top) with pixel zoom.
-    * Recall that these coords are transformed by the current
-    * vertex shader and viewport transformation.
-    */
-   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {
-      y = ctx->DrawBuffer->Height - (int) (y + height * ctx->Pixel.ZoomY);
-      invertTex = !invertTex;
-   }
-
-   x0 = (GLfloat) x;
-   x1 = x + width * ctx->Pixel.ZoomX;
-   y0 = (GLfloat) y;
-   y1 = y + height * ctx->Pixel.ZoomY;
-
-   /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */
-   z = z * 2.0 - 1.0;
-
-   draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex,
-             normalized ? ((GLfloat) width / sv[0]->texture->width0) : (GLfloat)width,
-             normalized ? ((GLfloat) height / sv[0]->texture->height0) : (GLfloat)height);
-
-   /* restore state */
-   cso_restore_rasterizer(cso);
-   cso_restore_viewport(cso);
-   cso_restore_samplers(cso);
-   cso_restore_fragment_sampler_views(cso);
-   cso_restore_fragment_shader(cso);
-   cso_restore_vertex_shader(cso);
-   cso_restore_vertex_elements(cso);
-   cso_restore_vertex_buffers(cso);
-   if (write_stencil) {
-      cso_restore_depth_stencil_alpha(cso);
-      cso_restore_blend(cso);
-   }
-}
-
-
-/**
- * Software fallback to do glDrawPixels(GL_STENCIL_INDEX) when we
- * can't use a fragment shader to write stencil values.
- */
-static void
-draw_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,
-                    GLsizei width, GLsizei height, GLenum format, GLenum type,
-                    const struct gl_pixelstore_attrib *unpack,
-                    const GLvoid *pixels)
-{
-   struct st_context *st = st_context(ctx);
-   struct pipe_context *pipe = st->pipe;
-   struct st_renderbuffer *strb;
-   enum pipe_transfer_usage usage;
-   struct pipe_transfer *pt;
-   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
-   GLint skipPixels;
-   ubyte *stmap;
-   struct gl_pixelstore_attrib clippedUnpack = *unpack;
-
-   if (!zoom) {
-      if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
-                                 &clippedUnpack)) {
-         /* totally clipped */
-         return;
-      }
-   }
-
-   strb = st_renderbuffer(ctx->DrawBuffer->
-                          Attachment[BUFFER_STENCIL].Renderbuffer);
-
-   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
-      y = ctx->DrawBuffer->Height - y - height;
-   }
-
-   if(format != GL_DEPTH_STENCIL && 
-      util_format_get_component_bits(strb->format,
-                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)
-      usage = PIPE_TRANSFER_READ_WRITE;
-   else
-      usage = PIPE_TRANSFER_WRITE;
-
-   pt = pipe_get_transfer(st_context(ctx)->pipe, strb->texture, 0, 0,
-                                     usage, x, y,
-                                     width, height);
-
-   stmap = pipe_transfer_map(pipe, pt);
-
-   pixels = _mesa_map_pbo_source(ctx, &clippedUnpack, pixels);
-   assert(pixels);
-
-   /* if width > MAX_WIDTH, have to process image in chunks */
-   skipPixels = 0;
-   while (skipPixels < width) {
-      const GLint spanX = skipPixels;
-      const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
-      GLint row;
-      for (row = 0; row < height; row++) {
-         GLubyte sValues[MAX_WIDTH];
-         GLuint zValues[MAX_WIDTH];
-         GLenum destType = GL_UNSIGNED_BYTE;
-         const GLvoid *source = _mesa_image_address2d(&clippedUnpack, pixels,
-                                                      width, height,
-                                                      format, type,
-                                                      row, skipPixels);
-         _mesa_unpack_stencil_span(ctx, spanWidth, destType, sValues,
-                                   type, source, &clippedUnpack,
-                                   ctx->_ImageTransferState);
-
-         if (format == GL_DEPTH_STENCIL) {
-            _mesa_unpack_depth_span(ctx, spanWidth, GL_UNSIGNED_INT, zValues,
-                                    (1 << 24) - 1, type, source,
-                                    &clippedUnpack);
-         }
-
-         if (zoom) {
-            _mesa_problem(ctx, "Gallium glDrawPixels(GL_STENCIL) with "
-                          "zoom not complete");
-         }
-
-         {
-            GLint spanY;
-
-            if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
-               spanY = height - row - 1;
-            }
-            else {
-               spanY = row;
-            }
-
-            /* now pack the stencil (and Z) values in the dest format */
-            switch (pt->resource->format) {
-            case PIPE_FORMAT_S8_USCALED:
-               {
-                  ubyte *dest = stmap + spanY * pt->stride + spanX;
-                  assert(usage == PIPE_TRANSFER_WRITE);
-                  memcpy(dest, sValues, spanWidth);
-               }
-               break;
-            case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
-               if (format == GL_DEPTH_STENCIL) {
-                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);
-                  GLint k;
-                  assert(usage == PIPE_TRANSFER_WRITE);
-                  for (k = 0; k < spanWidth; k++) {
-                     dest[k] = zValues[k] | (sValues[k] << 24);
-                  }
-               }
-               else {
-                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);
-                  GLint k;
-                  assert(usage == PIPE_TRANSFER_READ_WRITE);
-                  for (k = 0; k < spanWidth; k++) {
-                     dest[k] = (dest[k] & 0xffffff) | (sValues[k] << 24);
-                  }
-               }
-               break;
-            case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
-               if (format == GL_DEPTH_STENCIL) {
-                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);
-                  GLint k;
-                  assert(usage == PIPE_TRANSFER_WRITE);
-                  for (k = 0; k < spanWidth; k++) {
-                     dest[k] = (zValues[k] << 8) | (sValues[k] & 0xff);
-                  }
-               }
-               else {
-                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);
-                  GLint k;
-                  assert(usage == PIPE_TRANSFER_READ_WRITE);
-                  for (k = 0; k < spanWidth; k++) {
-                     dest[k] = (dest[k] & 0xffffff00) | (sValues[k] & 0xff);
-                  }
-               }
-               break;
-            default:
-               assert(0);
-            }
-         }
-      }
-      skipPixels += spanWidth;
-   }
-
-   _mesa_unmap_pbo_source(ctx, &clippedUnpack);
-
-   /* unmap the stencil buffer */
-   pipe_transfer_unmap(pipe, pt);
-   pipe->transfer_destroy(pipe, pt);
-}
-
-
-/**
- * Get fragment program variant for a glDrawPixels or glCopyPixels
- * command for RGBA data.
- */
-static struct st_fp_variant *
-get_color_fp_variant(struct st_context *st)
-{
-   struct gl_context *ctx = st->ctx;
-   struct st_fp_variant_key key;
-   struct st_fp_variant *fpv;
-
-   memset(&key, 0, sizeof(key));
-
-   key.st = st;
-   key.drawpixels = 1;
-   key.scaleAndBias = (ctx->Pixel.RedBias != 0.0 ||
-                       ctx->Pixel.RedScale != 1.0 ||
-                       ctx->Pixel.GreenBias != 0.0 ||
-                       ctx->Pixel.GreenScale != 1.0 ||
-                       ctx->Pixel.BlueBias != 0.0 ||
-                       ctx->Pixel.BlueScale != 1.0 ||
-                       ctx->Pixel.AlphaBias != 0.0 ||
-                       ctx->Pixel.AlphaScale != 1.0);
-   key.pixelMaps = ctx->Pixel.MapColorFlag;
-
-   fpv = st_get_fp_variant(st, st->fp, &key);
-
-   return fpv;
-}
-
-
-/**
- * Get fragment program variant for a glDrawPixels or glCopyPixels
- * command for depth/stencil data.
- */
-static struct st_fp_variant *
-get_depth_stencil_fp_variant(struct st_context *st, GLboolean write_depth,
-                             GLboolean write_stencil)
-{
-   struct st_fp_variant_key key;
-   struct st_fp_variant *fpv;
-
-   memset(&key, 0, sizeof(key));
-
-   key.st = st;
-   key.drawpixels = 1;
-   key.drawpixels_z = write_depth;
-   key.drawpixels_stencil = write_stencil;
-
-   fpv = st_get_fp_variant(st, st->fp, &key);
-
-   return fpv;
-}
-
-
-/**
- * Called via ctx->Driver.DrawPixels()
- */
-static void
-st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,
-              GLsizei width, GLsizei height,
-              GLenum format, GLenum type,
-              const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)
-{
-   void *driver_vp, *driver_fp;
-   struct st_context *st = st_context(ctx);
-   const GLfloat *color;
-   struct pipe_context *pipe = st->pipe;
-   GLboolean write_stencil = GL_FALSE, write_depth = GL_FALSE;
-   struct pipe_sampler_view *sv[2];
-   int num_sampler_view = 1;
-   enum pipe_format stencil_format = PIPE_FORMAT_NONE;
-   struct st_fp_variant *fpv;
-
-   if (format == GL_DEPTH_STENCIL)
-      write_stencil = write_depth = GL_TRUE;
-   else if (format == GL_STENCIL_INDEX)
-      write_stencil = GL_TRUE;
-   else if (format == GL_DEPTH_COMPONENT)
-      write_depth = GL_TRUE;
-
-   if (write_stencil) {
-      enum pipe_format tex_format;
-      /* can we write to stencil if not fallback */
-      if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT))
-	 goto stencil_fallback;
-      
-      tex_format = st_choose_format(st->pipe->screen, base_format(format),
-                                    PIPE_TEXTURE_2D,
-				    0, PIPE_BIND_SAMPLER_VIEW);
-      if (tex_format == PIPE_FORMAT_Z24_UNORM_S8_USCALED)
-	 stencil_format = PIPE_FORMAT_X24S8_USCALED;
-      else if (tex_format == PIPE_FORMAT_S8_USCALED_Z24_UNORM)
-	 stencil_format = PIPE_FORMAT_S8X24_USCALED;
-      else
-	 stencil_format = PIPE_FORMAT_S8_USCALED;
-      if (stencil_format == PIPE_FORMAT_NONE)
-	 goto stencil_fallback;
-   }
-
-   /* Mesa state should be up to date by now */
-   assert(ctx->NewState == 0x0);
-
-   st_validate_state(st);
-
-   /*
-    * Get vertex/fragment shaders
-    */
-   if (write_depth || write_stencil) {
-      fpv = get_depth_stencil_fp_variant(st, write_depth, write_stencil);
-
-      driver_fp = fpv->driver_shader;
-
-      driver_vp = make_passthrough_vertex_shader(st, GL_TRUE);
-
-      color = ctx->Current.RasterColor;
-   }
-   else {
-      fpv = get_color_fp_variant(st);
-
-      driver_fp = fpv->driver_shader;
-
-      driver_vp = make_passthrough_vertex_shader(st, GL_FALSE);
-
-      color = NULL;
-      if (st->pixel_xfer.pixelmap_enabled) {
-	  sv[1] = st->pixel_xfer.pixelmap_sampler_view;
-	  num_sampler_view++;
-      }
-   }
-
-   /* update fragment program constants */
-   st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
-
-   /* draw with textured quad */
-   {
-      struct pipe_resource *pt
-         = make_texture(st, width, height, format, type, unpack, pixels);
-      if (pt) {
-         sv[0] = st_create_texture_sampler_view(st->pipe, pt);
-
-         if (sv[0]) {
-	    if (write_stencil) {
-	       sv[1] = st_create_texture_sampler_view_format(st->pipe, pt,
-                                                             stencil_format);
-	       num_sampler_view++;
-	    }
-
-            draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],
-                               width, height,
-                               ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
-                               sv,
-                               num_sampler_view,
-                               driver_vp,
-                               driver_fp,
-                               color, GL_FALSE, write_depth, write_stencil);
-            pipe_sampler_view_reference(&sv[0], NULL);
-            if (num_sampler_view > 1)
-               pipe_sampler_view_reference(&sv[1], NULL);
-         }
-         pipe_resource_reference(&pt, NULL);
-      }
-   }
-   return;
-
-stencil_fallback:
-   draw_stencil_pixels(ctx, x, y, width, height, format, type,
-		       unpack, pixels);
-}
-
-
-
-/**
- * Software fallback for glCopyPixels(GL_STENCIL).
- */
-static void
-copy_stencil_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
-                    GLsizei width, GLsizei height,
-                    GLint dstx, GLint dsty)
-{
-   struct st_renderbuffer *rbDraw;
-   struct pipe_context *pipe = st_context(ctx)->pipe;
-   enum pipe_transfer_usage usage;
-   struct pipe_transfer *ptDraw;
-   ubyte *drawMap;
-   ubyte *buffer;
-   int i;
-
-   buffer = malloc(width * height * sizeof(ubyte));
-   if (!buffer) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");
-      return;
-   }
-
-   /* Get the dest renderbuffer.  If there's a wrapper, use the
-    * underlying renderbuffer.
-    */
-   rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);
-   if (rbDraw->Base.Wrapped)
-      rbDraw = st_renderbuffer(rbDraw->Base.Wrapped);
-
-   /* this will do stencil pixel transfer ops */
-   st_read_stencil_pixels(ctx, srcx, srcy, width, height,
-                          GL_STENCIL_INDEX, GL_UNSIGNED_BYTE,
-                          &ctx->DefaultPacking, buffer);
-
-   if (0) {
-      /* debug code: dump stencil values */
-      GLint row, col;
-      for (row = 0; row < height; row++) {
-         printf("%3d: ", row);
-         for (col = 0; col < width; col++) {
-            printf("%02x ", buffer[col + row * width]);
-         }
-         printf("\n");
-      }
-   }
-
-   if (util_format_get_component_bits(rbDraw->format,
-                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)
-      usage = PIPE_TRANSFER_READ_WRITE;
-   else
-      usage = PIPE_TRANSFER_WRITE;
-
-   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
-      dsty = rbDraw->Base.Height - dsty - height;
-   }
-
-   ptDraw = pipe_get_transfer(st_context(ctx)->pipe,
-                              rbDraw->texture, 0, 0,
-                              usage, dstx, dsty,
-                              width, height);
-
-   assert(util_format_get_blockwidth(ptDraw->resource->format) == 1);
-   assert(util_format_get_blockheight(ptDraw->resource->format) == 1);
-
-   /* map the stencil buffer */
-   drawMap = pipe_transfer_map(pipe, ptDraw);
-
-   /* draw */
-   /* XXX PixelZoom not handled yet */
-   for (i = 0; i < height; i++) {
-      ubyte *dst;
-      const ubyte *src;
-      int y;
-
-      y = i;
-
-      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
-         y = height - y - 1;
-      }
-
-      dst = drawMap + y * ptDraw->stride;
-      src = buffer + i * width;
-
-      switch (ptDraw->resource->format) {
-      case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
-         {
-            uint *dst4 = (uint *) dst;
-            int j;
-            assert(usage == PIPE_TRANSFER_READ_WRITE);
-            for (j = 0; j < width; j++) {
-               *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);
-               dst4++;
-            }
-         }
-         break;
-      case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
-         {
-            uint *dst4 = (uint *) dst;
-            int j;
-            assert(usage == PIPE_TRANSFER_READ_WRITE);
-            for (j = 0; j < width; j++) {
-               *dst4 = (*dst4 & 0xffffff00) | (src[j] & 0xff);
-               dst4++;
-            }
-         }
-         break;
-      case PIPE_FORMAT_S8_USCALED:
-         assert(usage == PIPE_TRANSFER_WRITE);
-         memcpy(dst, src, width);
-         break;
-      default:
-         assert(0);
-      }
-   }
-
-   free(buffer);
-
-   /* unmap the stencil buffer */
-   pipe_transfer_unmap(pipe, ptDraw);
-   pipe->transfer_destroy(pipe, ptDraw);
-}
-
-
-/** Do the src/dest regions overlap? */
-static GLboolean
-regions_overlap(GLint srcX, GLint srcY, GLint dstX, GLint dstY,
-                GLsizei width, GLsizei height)
-{
-   if (srcX + width <= dstX ||
-       dstX + width <= srcX ||
-       srcY + height <= dstY ||
-       dstY + height <= srcY)
-      return GL_FALSE;
-   else
-      return GL_TRUE;
-}
-
-
-/**
- * Try to do a glCopyPixels for simple cases with a blit by calling
- * pipe->resource_copy_region().
- *
- * We can do this when we're copying color pixels (depth/stencil
- * eventually) with no pixel zoom, no pixel transfer ops, no
- * per-fragment ops, the src/dest regions don't overlap and the
- * src/dest pixel formats are the same.
- */
-static GLboolean
-blit_copy_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
-                 GLsizei width, GLsizei height,
-                 GLint dstx, GLint dsty, GLenum type)
-{
-   struct st_context *st = st_context(ctx);
-   struct pipe_context *pipe = st->pipe;
-   struct gl_pixelstore_attrib pack, unpack;
-   GLint readX, readY, readW, readH;
-
-   if (type == GL_COLOR &&
-       ctx->Pixel.ZoomX == 1.0 &&
-       ctx->Pixel.ZoomY == 1.0 &&
-       ctx->_ImageTransferState == 0x0 &&
-       !ctx->Color.BlendEnabled &&
-       !ctx->Color.AlphaEnabled &&
-       !ctx->Depth.Test &&
-       !ctx->Fog.Enabled &&
-       !ctx->Stencil.Enabled &&
-       !ctx->FragmentProgram.Enabled &&
-       !ctx->VertexProgram.Enabled &&
-       !ctx->Shader.CurrentFragmentProgram &&
-       st_fb_orientation(ctx->ReadBuffer) == st_fb_orientation(ctx->DrawBuffer) &&
-       ctx->DrawBuffer->_NumColorDrawBuffers == 1) {
-      struct st_renderbuffer *rbRead, *rbDraw;
-      GLint drawX, drawY;
-
-      /*
-       * Clip the read region against the src buffer bounds.
-       * We'll still allocate a temporary buffer/texture for the original
-       * src region size but we'll only read the region which is on-screen.
-       * This may mean that we draw garbage pixels into the dest region, but
-       * that's expected.
-       */
-      readX = srcx;
-      readY = srcy;
-      readW = width;
-      readH = height;
-      pack = ctx->DefaultPacking;
-      if (!_mesa_clip_readpixels(ctx, &readX, &readY, &readW, &readH, &pack))
-         return GL_TRUE; /* all done */
-
-      /* clip against dest buffer bounds and scissor box */
-      drawX = dstx + pack.SkipPixels;
-      drawY = dsty + pack.SkipRows;
-      unpack = pack;
-      if (!_mesa_clip_drawpixels(ctx, &drawX, &drawY, &readW, &readH, &unpack))
-         return GL_TRUE; /* all done */
-
-      readX = readX - pack.SkipPixels + unpack.SkipPixels;
-      readY = readY - pack.SkipRows + unpack.SkipRows;
-
-      rbRead = st_get_color_read_renderbuffer(ctx);
-      rbDraw = st_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]);
-
-      if ((rbRead != rbDraw ||
-           !regions_overlap(readX, readY, drawX, drawY, readW, readH)) &&
-          rbRead->Base.Format == rbDraw->Base.Format) {
-         struct pipe_box srcBox;
-
-         /* flip src/dst position if needed */
-         if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
-            /* both buffers will have the same orientation */
-            readY = ctx->ReadBuffer->Height - readY - readH;
-            drawY = ctx->DrawBuffer->Height - drawY - readH;
-         }
-
-         u_box_2d(readX, readY, readW, readH, &srcBox);
-
-         pipe->resource_copy_region(pipe,
-                                    rbDraw->texture, 0, drawX, drawY, 0,
-                                    rbRead->texture, 0, &srcBox);
-         return GL_TRUE;
-      }
-   }
-
-   return GL_FALSE;
-}
-
-
-static void
-st_CopyPixels(struct gl_context *ctx, GLint srcx, GLint srcy,
-              GLsizei width, GLsizei height,
-              GLint dstx, GLint dsty, GLenum type)
-{
-   struct st_context *st = st_context(ctx);
-   struct pipe_context *pipe = st->pipe;
-   struct pipe_screen *screen = pipe->screen;
-   struct st_renderbuffer *rbRead;
-   void *driver_vp, *driver_fp;
-   struct pipe_resource *pt;
-   struct pipe_sampler_view *sv[2];
-   int num_sampler_view = 1;
-   GLfloat *color;
-   enum pipe_format srcFormat, texFormat;
-   GLboolean invertTex = GL_FALSE;
-   GLint readX, readY, readW, readH;
-   GLuint sample_count;
-   struct gl_pixelstore_attrib pack = ctx->DefaultPacking;
-   struct st_fp_variant *fpv;
-
-   st_validate_state(st);
-
-   if (type == GL_STENCIL) {
-      /* can't use texturing to do stencil */
-      copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);
-      return;
-   }
-
-   if (blit_copy_pixels(ctx, srcx, srcy, width, height, dstx, dsty, type))
-      return;
-
-   /*
-    * The subsequent code implements glCopyPixels by copying the source
-    * pixels into a temporary texture that's then applied to a textured quad.
-    * When we draw the textured quad, all the usual per-fragment operations
-    * are handled.
-    */
-
-
-   /*
-    * Get vertex/fragment shaders
-    */
-   if (type == GL_COLOR) {
-      rbRead = st_get_color_read_renderbuffer(ctx);
-      color = NULL;
-
-      fpv = get_color_fp_variant(st);
-      driver_fp = fpv->driver_shader;
-
-      driver_vp = make_passthrough_vertex_shader(st, GL_FALSE);
-
-      if (st->pixel_xfer.pixelmap_enabled) {
-	  sv[1] = st->pixel_xfer.pixelmap_sampler_view;
-	  num_sampler_view++;
-      }
-   }
-   else {
-      assert(type == GL_DEPTH);
-      rbRead = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);
-      color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
-
-      fpv = get_depth_stencil_fp_variant(st, GL_TRUE, GL_FALSE);
-      driver_fp = fpv->driver_shader;
-
-      driver_vp = make_passthrough_vertex_shader(st, GL_TRUE);
-   }
-
-   /* update fragment program constants */
-   st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);
-
-
-   if (rbRead->Base.Wrapped)
-      rbRead = st_renderbuffer(rbRead->Base.Wrapped);
-
-   sample_count = rbRead->texture->nr_samples;
-   /* I believe this would be legal, presumably would need to do a resolve
-      for color, and for depth/stencil spec says to just use one of the
-      depth/stencil samples per pixel? Need some transfer clarifications. */
-   assert(sample_count < 2);
-
-   srcFormat = rbRead->texture->format;
-
-   if (screen->is_format_supported(screen, srcFormat, st->internal_target,
-                                   sample_count,
-                                   PIPE_BIND_SAMPLER_VIEW)) {
-      texFormat = srcFormat;
-   }
-   else {
-      /* srcFormat can't be used as a texture format */
-      if (type == GL_DEPTH) {
-         texFormat = st_choose_format(screen, GL_DEPTH_COMPONENT,
-                                      st->internal_target, sample_count,
-                                      PIPE_BIND_DEPTH_STENCIL);
-         assert(texFormat != PIPE_FORMAT_NONE);
-      }
-      else {
-         /* default color format */
-         texFormat = st_choose_format(screen, GL_RGBA, st->internal_target,
-                                      sample_count, PIPE_BIND_SAMPLER_VIEW);
-         assert(texFormat != PIPE_FORMAT_NONE);
-      }
-   }
-
-   /* Invert src region if needed */
-   if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
-      srcy = ctx->ReadBuffer->Height - srcy - height;
-      invertTex = !invertTex;
-   }
-
-   /* Clip the read region against the src buffer bounds.
-    * We'll still allocate a temporary buffer/texture for the original
-    * src region size but we'll only read the region which is on-screen.
-    * This may mean that we draw garbage pixels into the dest region, but
-    * that's expected.
-    */
-   readX = srcx;
-   readY = srcy;
-   readW = width;
-   readH = height;
-   _mesa_clip_readpixels(ctx, &readX, &readY, &readW, &readH, &pack);
-   readW = MAX2(0, readW);
-   readH = MAX2(0, readH);
-
-   /* alloc temporary texture */
-   pt = alloc_texture(st, width, height, texFormat);
-   if (!pt)
-      return;
-
-   sv[0] = st_create_texture_sampler_view(st->pipe, pt);
-   if (!sv[0]) {
-      pipe_resource_reference(&pt, NULL);
-      return;
-   }
-
-   /* Make temporary texture which is a copy of the src region.
-    */
-   if (srcFormat == texFormat) {
-      struct pipe_box src_box;
-      u_box_2d(readX, readY, readW, readH, &src_box);
-      /* copy source framebuffer surface into mipmap/texture */
-      pipe->resource_copy_region(pipe,
-                                 pt,                                /* dest tex */
-                                 0,
-                                 pack.SkipPixels, pack.SkipRows, 0, /* dest pos */
-                                 rbRead->texture,                   /* src tex */
-                                 0,
-                                 &src_box);
-
-   }
-   else {
-      /* CPU-based fallback/conversion */
-      struct pipe_transfer *ptRead =
-         pipe_get_transfer(st->pipe, rbRead->texture,
-                           0, 0, /* level, layer */
-                           PIPE_TRANSFER_READ,
-                           readX, readY, readW, readH);
-      struct pipe_transfer *ptTex;
-      enum pipe_transfer_usage transfer_usage;
-
-      if (ST_DEBUG & DEBUG_FALLBACK)
-         debug_printf("%s: fallback processing\n", __FUNCTION__);
-
-      if (type == GL_DEPTH && util_format_is_depth_and_stencil(pt->format))
-         transfer_usage = PIPE_TRANSFER_READ_WRITE;
-      else
-         transfer_usage = PIPE_TRANSFER_WRITE;
-
-      ptTex = pipe_get_transfer(st->pipe, pt, 0, 0, transfer_usage,
-                                0, 0, width, height);
-
-      /* copy image from ptRead surface to ptTex surface */
-      if (type == GL_COLOR) {
-         /* alternate path using get/put_tile() */
-         GLfloat *buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
-         enum pipe_format readFormat, drawFormat;
-         readFormat = util_format_linear(rbRead->texture->format);
-         drawFormat = util_format_linear(pt->format);
-         pipe_get_tile_rgba_format(pipe, ptRead, 0, 0, readW, readH,
-                                   readFormat, buf);
-         pipe_put_tile_rgba_format(pipe, ptTex, pack.SkipPixels, pack.SkipRows,
-                                   readW, readH, drawFormat, buf);
-         free(buf);
-      }
-      else {
-         /* GL_DEPTH */
-         GLuint *buf = (GLuint *) malloc(width * height * sizeof(GLuint));
-         pipe_get_tile_z(pipe, ptRead, 0, 0, readW, readH, buf);
-         pipe_put_tile_z(pipe, ptTex, pack.SkipPixels, pack.SkipRows,
-                         readW, readH, buf);
-         free(buf);
-      }
-
-      pipe->transfer_destroy(pipe, ptRead);
-      pipe->transfer_destroy(pipe, ptTex);
-   }
-
-   /* OK, the texture 'pt' contains the src image/pixels.  Now draw a
-    * textured quad with that texture.
-    */
-   draw_textured_quad(ctx, dstx, dsty, ctx->Current.RasterPos[2],
-                      width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,
-                      sv,
-                      num_sampler_view,
-                      driver_vp, 
-                      driver_fp,
-                      color, invertTex, GL_FALSE, GL_FALSE);
-
-   pipe_resource_reference(&pt, NULL);
-   pipe_sampler_view_reference(&sv[0], NULL);
-}
-
-
-
-void st_init_drawpixels_functions(struct dd_function_table *functions)
-{
-   functions->DrawPixels = st_DrawPixels;
-   functions->CopyPixels = st_CopyPixels;
-}
-
-
-void
-st_destroy_drawpix(struct st_context *st)
-{
-   GLuint i;
-
-   for (i = 0; i < Elements(st->drawpix.shaders); i++) {
-      if (st->drawpix.shaders[i])
-         _mesa_reference_fragprog(st->ctx, &st->drawpix.shaders[i], NULL);
-   }
-
-   st_reference_fragprog(st, &st->pixel_xfer.combined_prog, NULL);
-   if (st->drawpix.vert_shaders[0])
-      ureg_free_tokens(st->drawpix.vert_shaders[0]);
-   if (st->drawpix.vert_shaders[1])
-      ureg_free_tokens(st->drawpix.vert_shaders[1]);
-}
-
-#endif /* FEATURE_drawpix */
+/**************************************************************************

+ * 

+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

+ * All Rights Reserved.

+ * 

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the

+ * "Software"), to deal in the Software without restriction, including

+ * without limitation the rights to use, copy, modify, merge, publish,

+ * distribute, sub license, and/or sell copies of the Software, and to

+ * permit persons to whom the Software is furnished to do so, subject to

+ * the following conditions:

+ * 

+ * The above copyright notice and this permission notice (including the

+ * next paragraph) shall be included in all copies or substantial portions

+ * of the Software.

+ * 

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ * 

+ **************************************************************************/

+

+ /*

+  * Authors:

+  *   Brian Paul

+  */

+

+#include "main/imports.h"

+#include "main/image.h"

+#include "main/bufferobj.h"

+#include "main/macros.h"

+#include "main/mfeatures.h"

+#include "main/mtypes.h"

+#include "main/pack.h"

+#include "main/pbo.h"

+#include "main/texformat.h"

+#include "main/texstore.h"

+#include "program/program.h"

+#include "program/prog_print.h"

+#include "program/prog_instruction.h"

+

+#include "st_atom.h"

+#include "st_atom_constbuf.h"

+#include "st_cb_drawpixels.h"

+#include "st_cb_readpixels.h"

+#include "st_cb_fbo.h"

+#include "st_context.h"

+#include "st_debug.h"

+#include "st_format.h"

+#include "st_program.h"

+#include "st_texture.h"

+

+#include "pipe/p_context.h"

+#include "pipe/p_defines.h"

+#include "tgsi/tgsi_ureg.h"

+#include "util/u_draw_quad.h"

+#include "util/u_format.h"

+#include "util/u_inlines.h"

+#include "util/u_math.h"

+#include "util/u_tile.h"

+#include "cso_cache/cso_context.h"

+

+

+#if FEATURE_drawpix

+

+/**

+ * Check if the given program is:

+ * 0: MOVE result.color, fragment.color;

+ * 1: END;

+ */

+static GLboolean

+is_passthrough_program(const struct gl_fragment_program *prog)

+{

+   if (prog->Base.NumInstructions == 2) {

+      const struct prog_instruction *inst = prog->Base.Instructions;

+      if (inst[0].Opcode == OPCODE_MOV &&

+          inst[1].Opcode == OPCODE_END &&

+          inst[0].DstReg.File == PROGRAM_OUTPUT &&

+          inst[0].DstReg.Index == FRAG_RESULT_COLOR &&

+          inst[0].DstReg.WriteMask == WRITEMASK_XYZW &&

+          inst[0].SrcReg[0].File == PROGRAM_INPUT &&

+          inst[0].SrcReg[0].Index == FRAG_ATTRIB_COL0 &&

+          inst[0].SrcReg[0].Swizzle == SWIZZLE_XYZW) {

+         return GL_TRUE;

+      }

+   }

+   return GL_FALSE;

+}

+

+

+

+/**

+ * Make fragment shader for glDraw/CopyPixels.  This shader is made

+ * by combining the pixel transfer shader with the user-defined shader.

+ * \param fpIn  the current/incoming fragment program

+ * \param fpOut  returns the combined fragment program

+ */

+void

+st_make_drawpix_fragment_program(struct st_context *st,

+                                 struct gl_fragment_program *fpIn,

+                                 struct gl_fragment_program **fpOut)

+{

+   struct gl_program *newProg;

+

+   if (is_passthrough_program(fpIn)) {

+      newProg = (struct gl_program *) _mesa_clone_fragment_program(st->ctx,

+                                             &st->pixel_xfer.program->Base);

+   }

+   else {

+#if 0

+      /* debug */

+      printf("Base program:\n");

+      _mesa_print_program(&fpIn->Base);

+      printf("DrawPix program:\n");

+      _mesa_print_program(&st->pixel_xfer.program->Base.Base);

+#endif

+      newProg = _mesa_combine_programs(st->ctx,

+                                       &st->pixel_xfer.program->Base.Base,

+                                       &fpIn->Base);

+   }

+

+#if 0

+   /* debug */

+   printf("Combined DrawPixels program:\n");

+   _mesa_print_program(newProg);

+   printf("InputsRead: 0x%x\n", newProg->InputsRead);

+   printf("OutputsWritten: 0x%x\n", newProg->OutputsWritten);

+   _mesa_print_parameter_list(newProg->Parameters);

+#endif

+

+   *fpOut = (struct gl_fragment_program *) newProg;

+}

+

+

+/**

+ * Create fragment program that does a TEX() instruction to get a Z and/or

+ * stencil value value, then writes to FRAG_RESULT_DEPTH/FRAG_RESULT_STENCIL.

+ * Used for glDrawPixels(GL_DEPTH_COMPONENT / GL_STENCIL_INDEX).

+ * Pass fragment color through as-is.

+ * \return pointer to the gl_fragment program

+ */

+struct gl_fragment_program *

+st_make_drawpix_z_stencil_program(struct st_context *st,

+                                  GLboolean write_depth,

+                                  GLboolean write_stencil)

+{

+   struct gl_context *ctx = st->ctx;

+   struct gl_program *p;

+   struct gl_fragment_program *fp;

+   GLuint ic = 0;

+   const GLuint shaderIndex = write_depth * 2 + write_stencil;

+

+   assert(shaderIndex < Elements(st->drawpix.shaders));

+

+   if (st->drawpix.shaders[shaderIndex]) {

+      /* already have the proper shader */

+      return st->drawpix.shaders[shaderIndex];

+   }

+

+   /*

+    * Create shader now

+    */

+   p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);

+   if (!p)

+      return NULL;

+

+   p->NumInstructions = write_depth ? 2 : 1;

+   p->NumInstructions += write_stencil ? 1 : 0;

+

+   p->Instructions = _mesa_alloc_instructions(p->NumInstructions);

+   if (!p->Instructions) {

+      ctx->Driver.DeleteProgram(ctx, p);

+      return NULL;

+   }

+   _mesa_init_instructions(p->Instructions, p->NumInstructions);

+

+   if (write_depth) {

+      /* TEX result.depth, fragment.texcoord[0], texture[0], 2D; */

+      p->Instructions[ic].Opcode = OPCODE_TEX;

+      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;

+      p->Instructions[ic].DstReg.Index = FRAG_RESULT_DEPTH;

+      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Z;

+      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;

+      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;

+      p->Instructions[ic].TexSrcUnit = 0;

+      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;

+      ic++;

+   }

+

+   if (write_stencil) {

+      /* TEX result.stencil, fragment.texcoord[0], texture[0], 2D; */

+      p->Instructions[ic].Opcode = OPCODE_TEX;

+      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;

+      p->Instructions[ic].DstReg.Index = FRAG_RESULT_STENCIL;

+      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Y;

+      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;

+      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;

+      p->Instructions[ic].TexSrcUnit = 1;

+      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;

+      ic++;

+   }

+

+   /* END; */

+   p->Instructions[ic++].Opcode = OPCODE_END;

+

+   assert(ic == p->NumInstructions);

+

+   p->InputsRead = FRAG_BIT_TEX0 | FRAG_BIT_COL0;

+   p->OutputsWritten = 0;

+   if (write_depth)

+      p->OutputsWritten |= BITFIELD64_BIT(FRAG_RESULT_DEPTH);

+   if (write_stencil)

+      p->OutputsWritten |= BITFIELD64_BIT(FRAG_RESULT_STENCIL);

+

+   p->SamplersUsed =  0x1;  /* sampler 0 (bit 0) is used */

+   if (write_stencil)

+      p->SamplersUsed |= 1 << 1;

+

+   fp = (struct gl_fragment_program *) p;

+

+   /* save the new shader */

+   st->drawpix.shaders[shaderIndex] = fp;

+

+   return fp;

+}

+

+

+/**

+ * Create a simple vertex shader that just passes through the

+ * vertex position and texcoord (and optionally, color).

+ */

+static void *

+make_passthrough_vertex_shader(struct st_context *st, 

+                               GLboolean passColor)

+{

+   if (!st->drawpix.vert_shaders[passColor]) {

+      struct ureg_program *ureg = ureg_create( TGSI_PROCESSOR_VERTEX );

+

+      if (ureg == NULL)

+         return NULL;

+

+      /* MOV result.pos, vertex.pos; */

+      ureg_MOV(ureg, 

+               ureg_DECL_output( ureg, TGSI_SEMANTIC_POSITION, 0 ),

+               ureg_DECL_vs_input( ureg, 0 ));

+      

+      /* MOV result.texcoord0, vertex.attr[1]; */

+      ureg_MOV(ureg, 

+               ureg_DECL_output( ureg, TGSI_SEMANTIC_GENERIC, 0 ),

+               ureg_DECL_vs_input( ureg, 1 ));

+      

+      if (passColor) {

+         /* MOV result.color0, vertex.attr[2]; */

+         ureg_MOV(ureg, 

+                  ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, 0 ),

+                  ureg_DECL_vs_input( ureg, 2 ));

+      }

+

+      ureg_END( ureg );

+      

+      st->drawpix.vert_shaders[passColor] = 

+         ureg_create_shader_and_destroy( ureg, st->pipe );

+   }

+

+   return st->drawpix.vert_shaders[passColor];

+}

+

+

+/**

+ * Return a texture base format for drawing/copying an image

+ * of the given format.

+ */

+static GLenum

+base_format(GLenum format)

+{

+   switch (format) {

+   case GL_DEPTH_COMPONENT:

+      return GL_DEPTH_COMPONENT;

+   case GL_DEPTH_STENCIL:

+      return GL_DEPTH_STENCIL;

+   case GL_STENCIL_INDEX:

+      return GL_STENCIL_INDEX;

+   default:

+      return GL_RGBA;

+   }

+}

+

+

+/**

+ * Return a texture internalFormat for drawing/copying an image

+ * of the given format and type.

+ */

+static GLenum

+internal_format(struct gl_context *ctx, GLenum format, GLenum type)

+{

+   switch (format) {

+   case GL_DEPTH_COMPONENT:

+      return GL_DEPTH_COMPONENT;

+   case GL_DEPTH_STENCIL:

+      return GL_DEPTH_STENCIL;

+   case GL_STENCIL_INDEX:

+      return GL_STENCIL_INDEX;

+   default:

+      if (_mesa_is_integer_format(format)) {

+         switch (type) {

+         case GL_BYTE:

+            return GL_RGBA8I;

+         case GL_UNSIGNED_BYTE:

+            return GL_RGBA8UI;

+         case GL_SHORT:

+            return GL_RGBA16I;

+         case GL_UNSIGNED_SHORT:

+            return GL_RGBA16UI;

+         case GL_INT:

+            return GL_RGBA32I;

+         case GL_UNSIGNED_INT:

+            return GL_RGBA32UI;

+         default:

+            assert(0 && "Unexpected type in internal_format()");

+            return GL_RGBA_INTEGER;

+         }

+      }

+      else {

+         switch (type) {

+         case GL_UNSIGNED_BYTE:

+         case GL_UNSIGNED_INT_8_8_8_8:

+         case GL_UNSIGNED_INT_8_8_8_8_REV:

+         default:

+            return GL_RGBA8;

+

+         case GL_UNSIGNED_BYTE_3_3_2:

+         case GL_UNSIGNED_BYTE_2_3_3_REV:

+         case GL_UNSIGNED_SHORT_4_4_4_4:

+         case GL_UNSIGNED_SHORT_4_4_4_4_REV:

+            return GL_RGBA4;

+

+         case GL_UNSIGNED_SHORT_5_6_5:

+         case GL_UNSIGNED_SHORT_5_6_5_REV:

+         case GL_UNSIGNED_SHORT_5_5_5_1:

+         case GL_UNSIGNED_SHORT_1_5_5_5_REV:

+            return GL_RGB5_A1;

+

+         case GL_UNSIGNED_INT_10_10_10_2:

+         case GL_UNSIGNED_INT_2_10_10_10_REV:

+            return GL_RGB10_A2;

+

+         case GL_UNSIGNED_SHORT:

+         case GL_UNSIGNED_INT:

+            return GL_RGBA16;

+

+         case GL_BYTE:

+            return

+               ctx->Extensions.EXT_texture_snorm ? GL_RGBA8_SNORM : GL_RGBA8;

+

+         case GL_SHORT:

+         case GL_INT:

+            return

+               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;

+

+         case GL_HALF_FLOAT_ARB:

+            return

+               ctx->Extensions.ARB_texture_float ? GL_RGBA16F :

+               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;

+

+         case GL_FLOAT:

+         case GL_DOUBLE:

+            return

+               ctx->Extensions.ARB_texture_float ? GL_RGBA32F :

+               ctx->Extensions.EXT_texture_snorm ? GL_RGBA16_SNORM : GL_RGBA16;

+

+         case GL_UNSIGNED_INT_5_9_9_9_REV:

+            assert(ctx->Extensions.EXT_texture_shared_exponent);

+            return GL_RGB9_E5;

+

+         case GL_UNSIGNED_INT_10F_11F_11F_REV:

+            assert(ctx->Extensions.EXT_packed_float);

+            return GL_R11F_G11F_B10F;

+         }

+      }

+   }

+}

+

+

+/**

+ * Create a temporary texture to hold an image of the given size.

+ * If width, height are not POT and the driver only handles POT textures,

+ * allocate the next larger size of texture that is POT.

+ */

+static struct pipe_resource *

+alloc_texture(struct st_context *st, GLsizei width, GLsizei height,

+              enum pipe_format texFormat)

+{

+   struct pipe_resource *pt;

+

+   pt = st_texture_create(st, st->internal_target, texFormat, 0,

+                          width, height, 1, 1, PIPE_BIND_SAMPLER_VIEW);

+

+   return pt;

+}

+

+

+/**

+ * Make texture containing an image for glDrawPixels image.

+ * If 'pixels' is NULL, leave the texture image data undefined.

+ */

+static struct pipe_resource *

+make_texture(struct st_context *st,

+	     GLsizei width, GLsizei height, GLenum format, GLenum type,

+	     const struct gl_pixelstore_attrib *unpack,

+	     const GLvoid *pixels)

+{

+   struct gl_context *ctx = st->ctx;

+   struct pipe_context *pipe = st->pipe;

+   gl_format mformat;

+   struct pipe_resource *pt;

+   enum pipe_format pipeFormat;

+   GLuint cpp;

+   GLenum baseFormat, intFormat;

+

+   baseFormat = base_format(format);

+   intFormat = internal_format(ctx, format, type);

+

+   mformat = st_ChooseTextureFormat_renderable(ctx, intFormat,

+                                               format, type, GL_FALSE);

+   assert(mformat);

+

+   pipeFormat = st_mesa_format_to_pipe_format(mformat);

+   assert(pipeFormat);

+   cpp = util_format_get_blocksize(pipeFormat);

+

+   pixels = _mesa_map_pbo_source(ctx, unpack, pixels);

+   if (!pixels)

+      return NULL;

+

+   /* alloc temporary texture */

+   pt = alloc_texture(st, width, height, pipeFormat);

+   if (!pt) {

+      _mesa_unmap_pbo_source(ctx, unpack);

+      return NULL;

+   }

+

+   {

+      struct pipe_transfer *transfer;

+      static const GLuint dstImageOffsets = 0;

+      GLboolean success;

+      GLubyte *dest;

+      const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;

+

+      /* we'll do pixel transfer in a fragment shader */

+      ctx->_ImageTransferState = 0x0;

+

+      transfer = pipe_get_transfer(st->pipe, pt, 0, 0,

+                                   PIPE_TRANSFER_WRITE, 0, 0,

+                                   width, height);

+

+      /* map texture transfer */

+      dest = pipe_transfer_map(pipe, transfer);

+

+

+      /* Put image into texture transfer.

+       * Note that the image is actually going to be upside down in

+       * the texture.  We deal with that with texcoords.

+       */

+      success = _mesa_texstore(ctx, 2,           /* dims */

+                               baseFormat,       /* baseInternalFormat */

+                               mformat,          /* gl_format */

+                               dest,             /* dest */

+                               0, 0, 0,          /* dstX/Y/Zoffset */

+                               transfer->stride, /* dstRowStride, bytes */

+                               &dstImageOffsets, /* dstImageOffsets */

+                               width, height, 1, /* size */

+                               format, type,     /* src format/type */

+                               pixels,           /* data source */

+                               unpack);

+

+      /* unmap */

+      pipe_transfer_unmap(pipe, transfer);

+      pipe->transfer_destroy(pipe, transfer);

+

+      assert(success);

+

+      /* restore */

+      ctx->_ImageTransferState = imageTransferStateSave;

+   }

+

+   _mesa_unmap_pbo_source(ctx, unpack);

+

+   return pt;

+}

+

+

+/**

+ * Draw quad with texcoords and optional color.

+ * Coords are gallium window coords with y=0=top.

+ * \param color  may be null

+ * \param invertTex  if true, flip texcoords vertically

+ */

+static void

+draw_quad(struct gl_context *ctx, GLfloat x0, GLfloat y0, GLfloat z,

+          GLfloat x1, GLfloat y1, const GLfloat *color,

+          GLboolean invertTex, GLfloat maxXcoord, GLfloat maxYcoord)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */

+

+   /* setup vertex data */

+   {

+      const struct gl_framebuffer *fb = st->ctx->DrawBuffer;

+      const GLfloat fb_width = (GLfloat) fb->Width;

+      const GLfloat fb_height = (GLfloat) fb->Height;

+      const GLfloat clip_x0 = x0 / fb_width * 2.0f - 1.0f;

+      const GLfloat clip_y0 = y0 / fb_height * 2.0f - 1.0f;

+      const GLfloat clip_x1 = x1 / fb_width * 2.0f - 1.0f;

+      const GLfloat clip_y1 = y1 / fb_height * 2.0f - 1.0f;

+      const GLfloat sLeft = 0.0f, sRight = maxXcoord;

+      const GLfloat tTop = invertTex ? maxYcoord : 0.0f;

+      const GLfloat tBot = invertTex ? 0.0f : maxYcoord;

+      GLuint i;

+

+      /* upper-left */

+      verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */

+      verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */

+

+      /* upper-right */

+      verts[1][0][0] = clip_x1;

+      verts[1][0][1] = clip_y0;

+

+      /* lower-right */

+      verts[2][0][0] = clip_x1;

+      verts[2][0][1] = clip_y1;

+

+      /* lower-left */

+      verts[3][0][0] = clip_x0;

+      verts[3][0][1] = clip_y1;

+

+      verts[0][1][0] = sLeft; /* v[0].attr[1].S */

+      verts[0][1][1] = tTop;  /* v[0].attr[1].T */

+      verts[1][1][0] = sRight;

+      verts[1][1][1] = tTop;

+      verts[2][1][0] = sRight;

+      verts[2][1][1] = tBot;

+      verts[3][1][0] = sLeft;

+      verts[3][1][1] = tBot;

+

+      /* same for all verts: */

+      if (color) {

+         for (i = 0; i < 4; i++) {

+            verts[i][0][2] = z;         /* v[i].attr[0].z */

+            verts[i][0][3] = 1.0f;      /* v[i].attr[0].w */

+            verts[i][2][0] = color[0];  /* v[i].attr[2].r */

+            verts[i][2][1] = color[1];  /* v[i].attr[2].g */

+            verts[i][2][2] = color[2];  /* v[i].attr[2].b */

+            verts[i][2][3] = color[3];  /* v[i].attr[2].a */

+            verts[i][1][2] = 0.0f;      /* v[i].attr[1].R */

+            verts[i][1][3] = 1.0f;      /* v[i].attr[1].Q */

+         }

+      }

+      else {

+         for (i = 0; i < 4; i++) {

+            verts[i][0][2] = z;    /*Z*/

+            verts[i][0][3] = 1.0f; /*W*/

+            verts[i][1][2] = 0.0f; /*R*/

+            verts[i][1][3] = 1.0f; /*Q*/

+         }

+      }

+   }

+

+   {

+      struct pipe_resource *buf;

+

+      /* allocate/load buffer object with vertex data */

+      buf = pipe_buffer_create(pipe->screen,

+			       PIPE_BIND_VERTEX_BUFFER,

+			       PIPE_USAGE_STATIC,

+                               sizeof(verts));

+      pipe_buffer_write(st->pipe, buf, 0, sizeof(verts), verts);

+

+      util_draw_vertex_buffer(pipe, st->cso_context, buf, 0,

+                              PIPE_PRIM_QUADS,

+                              4,  /* verts */

+                              3); /* attribs/vert */

+      pipe_resource_reference(&buf, NULL);

+   }

+}

+

+

+

+static void

+draw_textured_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,

+                   GLsizei width, GLsizei height,

+                   GLfloat zoomX, GLfloat zoomY,

+                   struct pipe_sampler_view **sv,

+                   int num_sampler_view,

+                   void *driver_vp,

+                   void *driver_fp,

+                   const GLfloat *color,

+                   GLboolean invertTex,

+                   GLboolean write_depth, GLboolean write_stencil)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   struct cso_context *cso = st->cso_context;

+   GLfloat x0, y0, x1, y1;

+   GLsizei maxSize;

+   boolean normalized = sv[0]->texture->target != PIPE_TEXTURE_RECT;

+

+   /* limit checks */

+   /* XXX if DrawPixels image is larger than max texture size, break

+    * it up into chunks.

+    */

+   maxSize = 1 << (pipe->screen->get_param(pipe->screen,

+                                        PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);

+   assert(width <= maxSize);

+   assert(height <= maxSize);

+

+   cso_save_rasterizer(cso);

+   cso_save_viewport(cso);

+   cso_save_samplers(cso);

+   cso_save_fragment_sampler_views(cso);

+   cso_save_fragment_shader(cso);

+   cso_save_vertex_shader(cso);

+   cso_save_vertex_elements(cso);

+   cso_save_vertex_buffers(cso);

+   if (write_stencil) {

+      cso_save_depth_stencil_alpha(cso);

+      cso_save_blend(cso);

+   }

+

+   /* rasterizer state: just scissor */

+   {

+      struct pipe_rasterizer_state rasterizer;

+      memset(&rasterizer, 0, sizeof(rasterizer));

+      rasterizer.clamp_fragment_color = ctx->Color._ClampFragmentColor;

+      rasterizer.gl_rasterization_rules = 1;

+      rasterizer.scissor = ctx->Scissor.Enabled;

+      cso_set_rasterizer(cso, &rasterizer);

+   }

+

+   if (write_stencil) {

+      /* Stencil writing bypasses the normal fragment pipeline to

+       * disable color writing and set stencil test to always pass.

+       */

+      struct pipe_depth_stencil_alpha_state dsa;

+      struct pipe_blend_state blend;

+

+      /* depth/stencil */

+      memset(&dsa, 0, sizeof(dsa));

+      dsa.stencil[0].enabled = 1;

+      dsa.stencil[0].func = PIPE_FUNC_ALWAYS;

+      dsa.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;

+      dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;

+      if (write_depth) {

+         /* writing depth+stencil: depth test always passes */

+         dsa.depth.enabled = 1;

+         dsa.depth.writemask = ctx->Depth.Mask;

+         dsa.depth.func = PIPE_FUNC_ALWAYS;

+      }

+      cso_set_depth_stencil_alpha(cso, &dsa);

+

+      /* blend (colormask) */

+      memset(&blend, 0, sizeof(blend));

+      cso_set_blend(cso, &blend);

+   }

+

+   /* fragment shader state: TEX lookup program */

+   cso_set_fragment_shader_handle(cso, driver_fp);

+

+   /* vertex shader state: position + texcoord pass-through */

+   cso_set_vertex_shader_handle(cso, driver_vp);

+

+

+   /* texture sampling state: */

+   {

+      struct pipe_sampler_state sampler;

+      memset(&sampler, 0, sizeof(sampler));

+      sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;

+      sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;

+      sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;

+      sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;

+      sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;

+      sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;

+      sampler.normalized_coords = normalized;

+

+      cso_single_sampler(cso, 0, &sampler);

+      if (num_sampler_view > 1) {

+         cso_single_sampler(cso, 1, &sampler);

+      }

+      cso_single_sampler_done(cso);

+   }

+

+   /* viewport state: viewport matching window dims */

+   {

+      const float w = (float) ctx->DrawBuffer->Width;

+      const float h = (float) ctx->DrawBuffer->Height;

+      struct pipe_viewport_state vp;

+      vp.scale[0] =  0.5f * w;

+      vp.scale[1] = -0.5f * h;

+      vp.scale[2] = 0.5f;

+      vp.scale[3] = 1.0f;

+      vp.translate[0] = 0.5f * w;

+      vp.translate[1] = 0.5f * h;

+      vp.translate[2] = 0.5f;

+      vp.translate[3] = 0.0f;

+      cso_set_viewport(cso, &vp);

+   }

+

+   cso_set_vertex_elements(cso, 3, st->velems_util_draw);

+

+   /* texture state: */

+   cso_set_fragment_sampler_views(cso, num_sampler_view, sv);

+

+   /* Compute Gallium window coords (y=0=top) with pixel zoom.

+    * Recall that these coords are transformed by the current

+    * vertex shader and viewport transformation.

+    */

+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {

+      y = ctx->DrawBuffer->Height - (int) (y + height * ctx->Pixel.ZoomY);

+      invertTex = !invertTex;

+   }

+

+   x0 = (GLfloat) x;

+   x1 = x + width * ctx->Pixel.ZoomX;

+   y0 = (GLfloat) y;

+   y1 = y + height * ctx->Pixel.ZoomY;

+

+   /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */

+   z = z * 2.0 - 1.0;

+

+   draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex,

+             normalized ? ((GLfloat) width / sv[0]->texture->width0) : (GLfloat)width,

+             normalized ? ((GLfloat) height / sv[0]->texture->height0) : (GLfloat)height);

+

+   /* restore state */

+   cso_restore_rasterizer(cso);

+   cso_restore_viewport(cso);

+   cso_restore_samplers(cso);

+   cso_restore_fragment_sampler_views(cso);

+   cso_restore_fragment_shader(cso);

+   cso_restore_vertex_shader(cso);

+   cso_restore_vertex_elements(cso);

+   cso_restore_vertex_buffers(cso);

+   if (write_stencil) {

+      cso_restore_depth_stencil_alpha(cso);

+      cso_restore_blend(cso);

+   }

+}

+

+

+/**

+ * Software fallback to do glDrawPixels(GL_STENCIL_INDEX) when we

+ * can't use a fragment shader to write stencil values.

+ */

+static void

+draw_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,

+                    GLsizei width, GLsizei height, GLenum format, GLenum type,

+                    const struct gl_pixelstore_attrib *unpack,

+                    const GLvoid *pixels)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   struct st_renderbuffer *strb;

+   enum pipe_transfer_usage usage;

+   struct pipe_transfer *pt;

+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;

+   GLint skipPixels;

+   ubyte *stmap;

+   struct gl_pixelstore_attrib clippedUnpack = *unpack;

+

+   if (!zoom) {

+      if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,

+                                 &clippedUnpack)) {

+         /* totally clipped */

+         return;

+      }

+   }

+

+   strb = st_renderbuffer(ctx->DrawBuffer->

+                          Attachment[BUFFER_STENCIL].Renderbuffer);

+

+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

+      y = ctx->DrawBuffer->Height - y - height;

+   }

+

+   if(format != GL_DEPTH_STENCIL && 

+      util_format_get_component_bits(strb->format,

+                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)

+      usage = PIPE_TRANSFER_READ_WRITE;

+   else

+      usage = PIPE_TRANSFER_WRITE;

+

+   pt = pipe_get_transfer(st_context(ctx)->pipe, strb->texture, 0, 0,

+                                     usage, x, y,

+                                     width, height);

+

+   stmap = pipe_transfer_map(pipe, pt);

+

+   pixels = _mesa_map_pbo_source(ctx, &clippedUnpack, pixels);

+   assert(pixels);

+

+   /* if width > MAX_WIDTH, have to process image in chunks */

+   skipPixels = 0;

+   while (skipPixels < width) {

+      const GLint spanX = skipPixels;

+      const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);

+      GLint row;

+      for (row = 0; row < height; row++) {

+         GLubyte sValues[MAX_WIDTH];

+         GLuint zValues[MAX_WIDTH];

+         GLenum destType = GL_UNSIGNED_BYTE;

+         const GLvoid *source = _mesa_image_address2d(&clippedUnpack, pixels,

+                                                      width, height,

+                                                      format, type,

+                                                      row, skipPixels);

+         _mesa_unpack_stencil_span(ctx, spanWidth, destType, sValues,

+                                   type, source, &clippedUnpack,

+                                   ctx->_ImageTransferState);

+

+         if (format == GL_DEPTH_STENCIL) {

+            _mesa_unpack_depth_span(ctx, spanWidth, GL_UNSIGNED_INT, zValues,

+                                    (1 << 24) - 1, type, source,

+                                    &clippedUnpack);

+         }

+

+         if (zoom) {

+            _mesa_problem(ctx, "Gallium glDrawPixels(GL_STENCIL) with "

+                          "zoom not complete");

+         }

+

+         {

+            GLint spanY;

+

+            if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

+               spanY = height - row - 1;

+            }

+            else {

+               spanY = row;

+            }

+

+            /* now pack the stencil (and Z) values in the dest format */

+            switch (pt->resource->format) {

+            case PIPE_FORMAT_S8_USCALED:

+               {

+                  ubyte *dest = stmap + spanY * pt->stride + spanX;

+                  assert(usage == PIPE_TRANSFER_WRITE);

+                  memcpy(dest, sValues, spanWidth);

+               }

+               break;

+            case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

+               if (format == GL_DEPTH_STENCIL) {

+                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

+                  GLint k;

+                  assert(usage == PIPE_TRANSFER_WRITE);

+                  for (k = 0; k < spanWidth; k++) {

+                     dest[k] = zValues[k] | (sValues[k] << 24);

+                  }

+               }

+               else {

+                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

+                  GLint k;

+                  assert(usage == PIPE_TRANSFER_READ_WRITE);

+                  for (k = 0; k < spanWidth; k++) {

+                     dest[k] = (dest[k] & 0xffffff) | (sValues[k] << 24);

+                  }

+               }

+               break;

+            case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

+               if (format == GL_DEPTH_STENCIL) {

+                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

+                  GLint k;

+                  assert(usage == PIPE_TRANSFER_WRITE);

+                  for (k = 0; k < spanWidth; k++) {

+                     dest[k] = (zValues[k] << 8) | (sValues[k] & 0xff);

+                  }

+               }

+               else {

+                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

+                  GLint k;

+                  assert(usage == PIPE_TRANSFER_READ_WRITE);

+                  for (k = 0; k < spanWidth; k++) {

+                     dest[k] = (dest[k] & 0xffffff00) | (sValues[k] & 0xff);

+                  }

+               }

+               break;

+            default:

+               assert(0);

+            }

+         }

+      }

+      skipPixels += spanWidth;

+   }

+

+   _mesa_unmap_pbo_source(ctx, &clippedUnpack);

+

+   /* unmap the stencil buffer */

+   pipe_transfer_unmap(pipe, pt);

+   pipe->transfer_destroy(pipe, pt);

+}

+

+

+/**

+ * Get fragment program variant for a glDrawPixels or glCopyPixels

+ * command for RGBA data.

+ */

+static struct st_fp_variant *

+get_color_fp_variant(struct st_context *st)

+{

+   struct gl_context *ctx = st->ctx;

+   struct st_fp_variant_key key;

+   struct st_fp_variant *fpv;

+

+   memset(&key, 0, sizeof(key));

+

+   key.st = st;

+   key.drawpixels = 1;

+   key.scaleAndBias = (ctx->Pixel.RedBias != 0.0 ||

+                       ctx->Pixel.RedScale != 1.0 ||

+                       ctx->Pixel.GreenBias != 0.0 ||

+                       ctx->Pixel.GreenScale != 1.0 ||

+                       ctx->Pixel.BlueBias != 0.0 ||

+                       ctx->Pixel.BlueScale != 1.0 ||

+                       ctx->Pixel.AlphaBias != 0.0 ||

+                       ctx->Pixel.AlphaScale != 1.0);

+   key.pixelMaps = ctx->Pixel.MapColorFlag;

+

+   fpv = st_get_fp_variant(st, st->fp, &key);

+

+   return fpv;

+}

+

+

+/**

+ * Get fragment program variant for a glDrawPixels or glCopyPixels

+ * command for depth/stencil data.

+ */

+static struct st_fp_variant *

+get_depth_stencil_fp_variant(struct st_context *st, GLboolean write_depth,

+                             GLboolean write_stencil)

+{

+   struct st_fp_variant_key key;

+   struct st_fp_variant *fpv;

+

+   memset(&key, 0, sizeof(key));

+

+   key.st = st;

+   key.drawpixels = 1;

+   key.drawpixels_z = write_depth;

+   key.drawpixels_stencil = write_stencil;

+

+   fpv = st_get_fp_variant(st, st->fp, &key);

+

+   return fpv;

+}

+

+

+/**

+ * Called via ctx->Driver.DrawPixels()

+ */

+static void

+st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,

+              GLsizei width, GLsizei height,

+              GLenum format, GLenum type,

+              const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)

+{

+   void *driver_vp, *driver_fp;

+   struct st_context *st = st_context(ctx);

+   const GLfloat *color;

+   struct pipe_context *pipe = st->pipe;

+   GLboolean write_stencil = GL_FALSE, write_depth = GL_FALSE;

+   struct pipe_sampler_view *sv[2];

+   int num_sampler_view = 1;

+   enum pipe_format stencil_format = PIPE_FORMAT_NONE;

+   struct st_fp_variant *fpv;

+

+   if (format == GL_DEPTH_STENCIL)

+      write_stencil = write_depth = GL_TRUE;

+   else if (format == GL_STENCIL_INDEX)

+      write_stencil = GL_TRUE;

+   else if (format == GL_DEPTH_COMPONENT)

+      write_depth = GL_TRUE;

+

+   if (write_stencil) {

+      enum pipe_format tex_format;

+      /* can we write to stencil if not fallback */

+      if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT))

+	 goto stencil_fallback;

+      

+      tex_format = st_choose_format(st->pipe->screen, base_format(format),

+                                    PIPE_TEXTURE_2D,

+				    0, PIPE_BIND_SAMPLER_VIEW);

+      if (tex_format == PIPE_FORMAT_Z24_UNORM_S8_USCALED)

+	 stencil_format = PIPE_FORMAT_X24S8_USCALED;

+      else if (tex_format == PIPE_FORMAT_S8_USCALED_Z24_UNORM)

+	 stencil_format = PIPE_FORMAT_S8X24_USCALED;

+      else

+	 stencil_format = PIPE_FORMAT_S8_USCALED;

+      if (stencil_format == PIPE_FORMAT_NONE)

+	 goto stencil_fallback;

+   }

+

+   /* Mesa state should be up to date by now */

+   assert(ctx->NewState == 0x0);

+

+   st_validate_state(st);

+

+   /*

+    * Get vertex/fragment shaders

+    */

+   if (write_depth || write_stencil) {

+      fpv = get_depth_stencil_fp_variant(st, write_depth, write_stencil);

+

+      driver_fp = fpv->driver_shader;

+

+      driver_vp = make_passthrough_vertex_shader(st, GL_TRUE);

+

+      color = ctx->Current.RasterColor;

+   }

+   else {

+      fpv = get_color_fp_variant(st);

+

+      driver_fp = fpv->driver_shader;

+

+      driver_vp = make_passthrough_vertex_shader(st, GL_FALSE);

+

+      color = NULL;

+      if (st->pixel_xfer.pixelmap_enabled) {

+	  sv[1] = st->pixel_xfer.pixelmap_sampler_view;

+	  num_sampler_view++;

+      }

+   }

+

+   /* update fragment program constants */

+   st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);

+

+   /* draw with textured quad */

+   {

+      struct pipe_resource *pt

+         = make_texture(st, width, height, format, type, unpack, pixels);

+      if (pt) {

+         sv[0] = st_create_texture_sampler_view(st->pipe, pt);

+

+         if (sv[0]) {

+	    if (write_stencil) {

+	       sv[1] = st_create_texture_sampler_view_format(st->pipe, pt,

+                                                             stencil_format);

+	       num_sampler_view++;

+	    }

+

+            draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],

+                               width, height,

+                               ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,

+                               sv,

+                               num_sampler_view,

+                               driver_vp,

+                               driver_fp,

+                               color, GL_FALSE, write_depth, write_stencil);

+            pipe_sampler_view_reference(&sv[0], NULL);

+            if (num_sampler_view > 1)

+               pipe_sampler_view_reference(&sv[1], NULL);

+         }

+         pipe_resource_reference(&pt, NULL);

+      }

+   }

+   return;

+

+stencil_fallback:

+   draw_stencil_pixels(ctx, x, y, width, height, format, type,

+		       unpack, pixels);

+}

+

+

+

+/**

+ * Software fallback for glCopyPixels(GL_STENCIL).

+ */

+static void

+copy_stencil_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,

+                    GLsizei width, GLsizei height,

+                    GLint dstx, GLint dsty)

+{

+   struct st_renderbuffer *rbDraw;

+   struct pipe_context *pipe = st_context(ctx)->pipe;

+   enum pipe_transfer_usage usage;

+   struct pipe_transfer *ptDraw;

+   ubyte *drawMap;

+   ubyte *buffer;

+   int i;

+

+   buffer = malloc(width * height * sizeof(ubyte));

+   if (!buffer) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");

+      return;

+   }

+

+   /* Get the dest renderbuffer.  If there's a wrapper, use the

+    * underlying renderbuffer.

+    */

+   rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);

+   if (rbDraw->Base.Wrapped)

+      rbDraw = st_renderbuffer(rbDraw->Base.Wrapped);

+

+   /* this will do stencil pixel transfer ops */

+   st_read_stencil_pixels(ctx, srcx, srcy, width, height,

+                          GL_STENCIL_INDEX, GL_UNSIGNED_BYTE,

+                          &ctx->DefaultPacking, buffer);

+

+   if (0) {

+      /* debug code: dump stencil values */

+      GLint row, col;

+      for (row = 0; row < height; row++) {

+         printf("%3d: ", row);

+         for (col = 0; col < width; col++) {

+            printf("%02x ", buffer[col + row * width]);

+         }

+         printf("\n");

+      }

+   }

+

+   if (util_format_get_component_bits(rbDraw->format,

+                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)

+      usage = PIPE_TRANSFER_READ_WRITE;

+   else

+      usage = PIPE_TRANSFER_WRITE;

+

+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

+      dsty = rbDraw->Base.Height - dsty - height;

+   }

+

+   ptDraw = pipe_get_transfer(st_context(ctx)->pipe,

+                              rbDraw->texture, 0, 0,

+                              usage, dstx, dsty,

+                              width, height);

+

+   assert(util_format_get_blockwidth(ptDraw->resource->format) == 1);

+   assert(util_format_get_blockheight(ptDraw->resource->format) == 1);

+

+   /* map the stencil buffer */

+   drawMap = pipe_transfer_map(pipe, ptDraw);

+

+   /* draw */

+   /* XXX PixelZoom not handled yet */

+   for (i = 0; i < height; i++) {

+      ubyte *dst;

+      const ubyte *src;

+      int y;

+

+      y = i;

+

+      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

+         y = height - y - 1;

+      }

+

+      dst = drawMap + y * ptDraw->stride;

+      src = buffer + i * width;

+

+      switch (ptDraw->resource->format) {

+      case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

+         {

+            uint *dst4 = (uint *) dst;

+            int j;

+            assert(usage == PIPE_TRANSFER_READ_WRITE);

+            for (j = 0; j < width; j++) {

+               *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);

+               dst4++;

+            }

+         }

+         break;

+      case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

+         {

+            uint *dst4 = (uint *) dst;

+            int j;

+            assert(usage == PIPE_TRANSFER_READ_WRITE);

+            for (j = 0; j < width; j++) {

+               *dst4 = (*dst4 & 0xffffff00) | (src[j] & 0xff);

+               dst4++;

+            }

+         }

+         break;

+      case PIPE_FORMAT_S8_USCALED:

+         assert(usage == PIPE_TRANSFER_WRITE);

+         memcpy(dst, src, width);

+         break;

+      default:

+         assert(0);

+      }

+   }

+

+   free(buffer);

+

+   /* unmap the stencil buffer */

+   pipe_transfer_unmap(pipe, ptDraw);

+   pipe->transfer_destroy(pipe, ptDraw);

+}

+

+

+/** Do the src/dest regions overlap? */

+static GLboolean

+regions_overlap(GLint srcX, GLint srcY, GLint dstX, GLint dstY,

+                GLsizei width, GLsizei height)

+{

+   if (srcX + width <= dstX ||

+       dstX + width <= srcX ||

+       srcY + height <= dstY ||

+       dstY + height <= srcY)

+      return GL_FALSE;

+   else

+      return GL_TRUE;

+}

+

+

+/**

+ * Try to do a glCopyPixels for simple cases with a blit by calling

+ * pipe->resource_copy_region().

+ *

+ * We can do this when we're copying color pixels (depth/stencil

+ * eventually) with no pixel zoom, no pixel transfer ops, no

+ * per-fragment ops, the src/dest regions don't overlap and the

+ * src/dest pixel formats are the same.

+ */

+static GLboolean

+blit_copy_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,

+                 GLsizei width, GLsizei height,

+                 GLint dstx, GLint dsty, GLenum type)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   struct gl_pixelstore_attrib pack, unpack;

+   GLint readX, readY, readW, readH;

+

+   if (type == GL_COLOR &&

+       ctx->Pixel.ZoomX == 1.0 &&

+       ctx->Pixel.ZoomY == 1.0 &&

+       ctx->_ImageTransferState == 0x0 &&

+       !ctx->Color.BlendEnabled &&

+       !ctx->Color.AlphaEnabled &&

+       !ctx->Depth.Test &&

+       !ctx->Fog.Enabled &&

+       !ctx->Stencil.Enabled &&

+       !ctx->FragmentProgram.Enabled &&

+       !ctx->VertexProgram.Enabled &&

+       !ctx->Shader.CurrentFragmentProgram &&

+       st_fb_orientation(ctx->ReadBuffer) == st_fb_orientation(ctx->DrawBuffer) &&

+       ctx->DrawBuffer->_NumColorDrawBuffers == 1) {

+      struct st_renderbuffer *rbRead, *rbDraw;

+      GLint drawX, drawY;

+

+      /*

+       * Clip the read region against the src buffer bounds.

+       * We'll still allocate a temporary buffer/texture for the original

+       * src region size but we'll only read the region which is on-screen.

+       * This may mean that we draw garbage pixels into the dest region, but

+       * that's expected.

+       */

+      readX = srcx;

+      readY = srcy;

+      readW = width;

+      readH = height;

+      pack = ctx->DefaultPacking;

+      if (!_mesa_clip_readpixels(ctx, &readX, &readY, &readW, &readH, &pack))

+         return GL_TRUE; /* all done */

+

+      /* clip against dest buffer bounds and scissor box */

+      drawX = dstx + pack.SkipPixels;

+      drawY = dsty + pack.SkipRows;

+      unpack = pack;

+      if (!_mesa_clip_drawpixels(ctx, &drawX, &drawY, &readW, &readH, &unpack))

+         return GL_TRUE; /* all done */

+

+      readX = readX - pack.SkipPixels + unpack.SkipPixels;

+      readY = readY - pack.SkipRows + unpack.SkipRows;

+

+      rbRead = st_get_color_read_renderbuffer(ctx);

+      rbDraw = st_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]);

+

+      if ((rbRead != rbDraw ||

+           !regions_overlap(readX, readY, drawX, drawY, readW, readH)) &&

+          rbRead->Base.Format == rbDraw->Base.Format) {

+         struct pipe_box srcBox;

+

+         /* flip src/dst position if needed */

+         if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {

+            /* both buffers will have the same orientation */

+            readY = ctx->ReadBuffer->Height - readY - readH;

+            drawY = ctx->DrawBuffer->Height - drawY - readH;

+         }

+

+         u_box_2d(readX, readY, readW, readH, &srcBox);

+

+         pipe->resource_copy_region(pipe,

+                                    rbDraw->texture, 0, drawX, drawY, 0,

+                                    rbRead->texture, 0, &srcBox);

+         return GL_TRUE;

+      }

+   }

+

+   return GL_FALSE;

+}

+

+

+static void

+st_CopyPixels(struct gl_context *ctx, GLint srcx, GLint srcy,

+              GLsizei width, GLsizei height,

+              GLint dstx, GLint dsty, GLenum type)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   struct pipe_screen *screen = pipe->screen;

+   struct st_renderbuffer *rbRead;

+   void *driver_vp, *driver_fp;

+   struct pipe_resource *pt;

+   struct pipe_sampler_view *sv[2];

+   int num_sampler_view = 1;

+   GLfloat *color;

+   enum pipe_format srcFormat, texFormat;

+   GLboolean invertTex = GL_FALSE;

+   GLint readX, readY, readW, readH;

+   GLuint sample_count;

+   struct gl_pixelstore_attrib pack = ctx->DefaultPacking;

+   struct st_fp_variant *fpv;

+

+   st_validate_state(st);

+

+   if (type == GL_STENCIL) {

+      /* can't use texturing to do stencil */

+      copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);

+      return;

+   }

+

+   if (blit_copy_pixels(ctx, srcx, srcy, width, height, dstx, dsty, type))

+      return;

+

+   /*

+    * The subsequent code implements glCopyPixels by copying the source

+    * pixels into a temporary texture that's then applied to a textured quad.

+    * When we draw the textured quad, all the usual per-fragment operations

+    * are handled.

+    */

+

+

+   /*

+    * Get vertex/fragment shaders

+    */

+   if (type == GL_COLOR) {

+      rbRead = st_get_color_read_renderbuffer(ctx);

+      color = NULL;

+

+      fpv = get_color_fp_variant(st);

+      driver_fp = fpv->driver_shader;

+

+      driver_vp = make_passthrough_vertex_shader(st, GL_FALSE);

+

+      if (st->pixel_xfer.pixelmap_enabled) {

+	  sv[1] = st->pixel_xfer.pixelmap_sampler_view;

+	  num_sampler_view++;

+      }

+   }

+   else {

+      assert(type == GL_DEPTH);

+      rbRead = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer);

+      color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];

+

+      fpv = get_depth_stencil_fp_variant(st, GL_TRUE, GL_FALSE);

+      driver_fp = fpv->driver_shader;

+

+      driver_vp = make_passthrough_vertex_shader(st, GL_TRUE);

+   }

+

+   /* update fragment program constants */

+   st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);

+

+

+   if (rbRead->Base.Wrapped)

+      rbRead = st_renderbuffer(rbRead->Base.Wrapped);

+

+   sample_count = rbRead->texture->nr_samples;

+   /* I believe this would be legal, presumably would need to do a resolve

+      for color, and for depth/stencil spec says to just use one of the

+      depth/stencil samples per pixel? Need some transfer clarifications. */

+   assert(sample_count < 2);

+

+   srcFormat = rbRead->texture->format;

+

+   if (screen->is_format_supported(screen, srcFormat, st->internal_target,

+                                   sample_count,

+                                   PIPE_BIND_SAMPLER_VIEW)) {

+      texFormat = srcFormat;

+   }

+   else {

+      /* srcFormat can't be used as a texture format */

+      if (type == GL_DEPTH) {

+         texFormat = st_choose_format(screen, GL_DEPTH_COMPONENT,

+                                      st->internal_target, sample_count,

+                                      PIPE_BIND_DEPTH_STENCIL);

+         assert(texFormat != PIPE_FORMAT_NONE);

+      }

+      else {

+         /* default color format */

+         texFormat = st_choose_format(screen, GL_RGBA, st->internal_target,

+                                      sample_count, PIPE_BIND_SAMPLER_VIEW);

+         assert(texFormat != PIPE_FORMAT_NONE);

+      }

+   }

+

+   /* Invert src region if needed */

+   if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {

+      srcy = ctx->ReadBuffer->Height - srcy - height;

+      invertTex = !invertTex;

+   }

+

+   /* Clip the read region against the src buffer bounds.

+    * We'll still allocate a temporary buffer/texture for the original

+    * src region size but we'll only read the region which is on-screen.

+    * This may mean that we draw garbage pixels into the dest region, but

+    * that's expected.

+    */

+   readX = srcx;

+   readY = srcy;

+   readW = width;

+   readH = height;

+   _mesa_clip_readpixels(ctx, &readX, &readY, &readW, &readH, &pack);

+   readW = MAX2(0, readW);

+   readH = MAX2(0, readH);

+

+   /* alloc temporary texture */

+   pt = alloc_texture(st, width, height, texFormat);

+   if (!pt)

+      return;

+

+   sv[0] = st_create_texture_sampler_view(st->pipe, pt);

+   if (!sv[0]) {

+      pipe_resource_reference(&pt, NULL);

+      return;

+   }

+

+   /* Make temporary texture which is a copy of the src region.

+    */

+   if (srcFormat == texFormat) {

+      struct pipe_box src_box;

+      u_box_2d(readX, readY, readW, readH, &src_box);

+      /* copy source framebuffer surface into mipmap/texture */

+      pipe->resource_copy_region(pipe,

+                                 pt,                                /* dest tex */

+                                 0,

+                                 pack.SkipPixels, pack.SkipRows, 0, /* dest pos */

+                                 rbRead->texture,                   /* src tex */

+                                 0,

+                                 &src_box);

+

+   }

+   else {

+      /* CPU-based fallback/conversion */

+      struct pipe_transfer *ptRead =

+         pipe_get_transfer(st->pipe, rbRead->texture,

+                           0, 0, /* level, layer */

+                           PIPE_TRANSFER_READ,

+                           readX, readY, readW, readH);

+      struct pipe_transfer *ptTex;

+      enum pipe_transfer_usage transfer_usage;

+

+      if (ST_DEBUG & DEBUG_FALLBACK)

+         debug_printf("%s: fallback processing\n", __FUNCTION__);

+

+      if (type == GL_DEPTH && util_format_is_depth_and_stencil(pt->format))

+         transfer_usage = PIPE_TRANSFER_READ_WRITE;

+      else

+         transfer_usage = PIPE_TRANSFER_WRITE;

+

+      ptTex = pipe_get_transfer(st->pipe, pt, 0, 0, transfer_usage,

+                                0, 0, width, height);

+

+      /* copy image from ptRead surface to ptTex surface */

+      if (type == GL_COLOR) {

+         /* alternate path using get/put_tile() */

+         GLfloat *buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));

+         enum pipe_format readFormat, drawFormat;

+         readFormat = util_format_linear(rbRead->texture->format);

+         drawFormat = util_format_linear(pt->format);

+         pipe_get_tile_rgba_format(pipe, ptRead, 0, 0, readW, readH,

+                                   readFormat, buf);

+         pipe_put_tile_rgba_format(pipe, ptTex, pack.SkipPixels, pack.SkipRows,

+                                   readW, readH, drawFormat, buf);

+         free(buf);

+      }

+      else {

+         /* GL_DEPTH */

+         GLuint *buf = (GLuint *) malloc(width * height * sizeof(GLuint));

+         pipe_get_tile_z(pipe, ptRead, 0, 0, readW, readH, buf);

+         pipe_put_tile_z(pipe, ptTex, pack.SkipPixels, pack.SkipRows,

+                         readW, readH, buf);

+         free(buf);

+      }

+

+      pipe->transfer_destroy(pipe, ptRead);

+      pipe->transfer_destroy(pipe, ptTex);

+   }

+

+   /* OK, the texture 'pt' contains the src image/pixels.  Now draw a

+    * textured quad with that texture.

+    */

+   draw_textured_quad(ctx, dstx, dsty, ctx->Current.RasterPos[2],

+                      width, height, ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,

+                      sv,

+                      num_sampler_view,

+                      driver_vp, 

+                      driver_fp,

+                      color, invertTex, GL_FALSE, GL_FALSE);

+

+   pipe_resource_reference(&pt, NULL);

+   pipe_sampler_view_reference(&sv[0], NULL);

+}

+

+

+

+void st_init_drawpixels_functions(struct dd_function_table *functions)

+{

+   functions->DrawPixels = st_DrawPixels;

+   functions->CopyPixels = st_CopyPixels;

+}

+

+

+void

+st_destroy_drawpix(struct st_context *st)

+{

+   GLuint i;

+

+   for (i = 0; i < Elements(st->drawpix.shaders); i++) {

+      if (st->drawpix.shaders[i])

+         _mesa_reference_fragprog(st->ctx, &st->drawpix.shaders[i], NULL);

+   }

+

+   st_reference_fragprog(st, &st->pixel_xfer.combined_prog, NULL);

+   if (st->drawpix.vert_shaders[0])

+      ureg_free_tokens(st->drawpix.vert_shaders[0]);

+   if (st->drawpix.vert_shaders[1])

+      ureg_free_tokens(st->drawpix.vert_shaders[1]);

+}

+

+#endif /* FEATURE_drawpix */