xserver and mesa git update 28-12-2010

1 files changed, 554 insertions, 0 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_cb_readpixels.c b/mesalib/src/mesa/state_tracker/st_cb_readpixels.c
new file mode 100644
index 000000000..a03e53a50
--- /dev/null
+++ b/mesalib/src/mesa/state_tracker/st_cb_readpixels.c
@@ -0,0 +1,554 @@
+/**************************************************************************

+ * 

+ * 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.

+ * 

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

+

+

+/**

+ * glReadPixels interface to pipe

+ *

+ * \author Brian Paul

+ */

+

+

+#include "main/imports.h"

+#include "main/bufferobj.h"

+#include "main/context.h"

+#include "main/image.h"

+#include "main/pack.h"

+

+#include "pipe/p_context.h"

+#include "pipe/p_defines.h"

+#include "util/u_inlines.h"

+#include "util/u_tile.h"

+

+#include "st_debug.h"

+#include "st_context.h"

+#include "st_atom.h"

+#include "st_cb_bitmap.h"

+#include "st_cb_readpixels.h"

+#include "st_cb_fbo.h"

+

+/**

+ * Special case for reading stencil buffer.

+ * For color/depth we use get_tile().  For stencil, map the stencil buffer.

+ */

+void

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

+                       GLsizei width, GLsizei height,

+                       GLenum format, GLenum type,

+                       const struct gl_pixelstore_attrib *packing,

+                       GLvoid *pixels)

+{

+   struct gl_framebuffer *fb = ctx->ReadBuffer;

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

+   struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer);

+   struct pipe_transfer *pt;

+   ubyte *stmap;

+   GLint j;

+

+   if (strb->Base.Wrapped) {

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

+   }

+

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

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

+   }

+

+   /* Create a read transfer from the renderbuffer's texture */

+

+   pt = pipe_get_transfer(pipe, strb->texture,

+                          0, 0,

+                          PIPE_TRANSFER_READ,

+                          x, y, width, height);

+

+   /* map the stencil buffer */

+   stmap = pipe_transfer_map(pipe, pt);

+

+   /* width should never be > MAX_WIDTH since we did clipping earlier */

+   ASSERT(width <= MAX_WIDTH);

+

+   /* process image row by row */

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

+      GLvoid *dest;

+      GLstencil sValues[MAX_WIDTH];

+      GLfloat zValues[MAX_WIDTH];

+      GLint srcY;

+

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

+         srcY = height - j - 1;

+      }

+      else {

+         srcY = j;

+      }

+

+      /* get stencil (and Z) values */

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

+      case PIPE_FORMAT_S8_USCALED:

+         {

+            const ubyte *src = stmap + srcY * pt->stride;

+            memcpy(sValues, src, width);

+         }

+         break;

+      case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

+         if (format == GL_DEPTH_STENCIL) {

+            const uint *src = (uint *) (stmap + srcY * pt->stride);

+            const GLfloat scale = 1.0f / (0xffffff);

+            GLint k;

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

+               sValues[k] = src[k] >> 24;

+               zValues[k] = (src[k] & 0xffffff) * scale;

+            }

+         }

+         else {

+            const uint *src = (uint *) (stmap + srcY * pt->stride);

+            GLint k;

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

+               sValues[k] = src[k] >> 24;

+            }

+         }

+         break;

+      case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

+         if (format == GL_DEPTH_STENCIL) {

+            const uint *src = (uint *) (stmap + srcY * pt->stride);

+            const GLfloat scale = 1.0f / (0xffffff);

+            GLint k;

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

+               sValues[k] = src[k] & 0xff;

+               zValues[k] = (src[k] >> 8) * scale;

+            }

+         }

+         else {

+            const uint *src = (uint *) (stmap + srcY * pt->stride);

+            GLint k;

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

+               sValues[k] = src[k] & 0xff;

+            }

+         }

+         break;

+      default:

+         assert(0);

+      }

+

+      /* store */

+      dest = _mesa_image_address2d(packing, pixels, width, height,

+                                   format, type, j, 0);

+      if (format == GL_DEPTH_STENCIL) {

+         _mesa_pack_depth_stencil_span(ctx, width, dest,

+                                       zValues, sValues, packing);

+      }

+      else {

+         _mesa_pack_stencil_span(ctx, width, type, dest, sValues, packing);

+      }

+   }

+

+   /* unmap the stencil buffer */

+   pipe_transfer_unmap(pipe, pt);

+   pipe->transfer_destroy(pipe, pt);

+}

+

+

+/**

+ * Return renderbuffer to use for reading color pixels for glRead/CopyPixel

+ * commands.

+ */

+struct st_renderbuffer *

+st_get_color_read_renderbuffer(struct gl_context *ctx)

+{

+   struct gl_framebuffer *fb = ctx->ReadBuffer;

+   struct st_renderbuffer *strb =

+      st_renderbuffer(fb->_ColorReadBuffer);

+

+   return strb;

+}

+

+

+/**

+ * Try to do glReadPixels in a fast manner for common cases.

+ * \return GL_TRUE for success, GL_FALSE for failure

+ */

+static GLboolean

+st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,

+                   GLint x, GLint y, GLsizei width, GLsizei height,

+                   GLenum format, GLenum type,

+                   const struct gl_pixelstore_attrib *pack,

+                   GLvoid *dest)

+{

+   enum combination {

+      A8R8G8B8_UNORM_TO_RGBA_UBYTE,

+      A8R8G8B8_UNORM_TO_RGB_UBYTE,

+      A8R8G8B8_UNORM_TO_BGRA_UINT

+   } combo;

+

+   if (ctx->_ImageTransferState)

+      return GL_FALSE;

+

+   if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&

+       format == GL_RGBA && type == GL_UNSIGNED_BYTE) {

+      combo = A8R8G8B8_UNORM_TO_RGBA_UBYTE;

+   }

+   else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&

+            format == GL_RGB && type == GL_UNSIGNED_BYTE) {

+      combo = A8R8G8B8_UNORM_TO_RGB_UBYTE;

+   }

+   else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&

+            format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {

+      combo = A8R8G8B8_UNORM_TO_BGRA_UINT;

+   }

+   else {

+      return GL_FALSE;

+   }

+

+   /*printf("st_fast_readpixels combo %d\n", (GLint) combo);*/

+

+   {

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

+      struct pipe_transfer *trans;

+      const GLubyte *map;

+      GLubyte *dst;

+      GLint row, col, dy, dstStride;

+

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

+         /* convert GL Y to Gallium Y */

+         y = strb->texture->height0 - y - height;

+      }

+

+      trans = pipe_get_transfer(pipe, strb->texture,

+                                0, 0,

+                                PIPE_TRANSFER_READ,

+                                x, y, width, height);

+      if (!trans) {

+         return GL_FALSE;

+      }

+

+      map = pipe_transfer_map(pipe, trans);

+      if (!map) {

+         pipe->transfer_destroy(pipe, trans);

+         return GL_FALSE;

+      }

+

+      /* We always write to the user/dest buffer from low addr to high addr

+       * but the read order depends on renderbuffer orientation

+       */

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

+         /* read source rows from bottom to top */

+         y = height - 1;

+         dy = -1;

+      }

+      else {

+         /* read source rows from top to bottom */

+         y = 0;

+         dy = 1;

+      }

+

+      dst = _mesa_image_address2d(pack, dest, width, height,

+                                  format, type, 0, 0);

+      dstStride = _mesa_image_row_stride(pack, width, format, type);

+

+      switch (combo) {

+      case A8R8G8B8_UNORM_TO_RGBA_UBYTE:

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

+            const GLubyte *src = map + y * trans->stride;

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

+               GLuint pixel = ((GLuint *) src)[col];

+               dst[col*4+0] = (pixel >> 16) & 0xff;

+               dst[col*4+1] = (pixel >>  8) & 0xff;

+               dst[col*4+2] = (pixel >>  0) & 0xff;

+               dst[col*4+3] = (pixel >> 24) & 0xff;

+            }

+            dst += dstStride;

+            y += dy;

+         }

+         break;

+      case A8R8G8B8_UNORM_TO_RGB_UBYTE:

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

+            const GLubyte *src = map + y * trans->stride;

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

+               GLuint pixel = ((GLuint *) src)[col];

+               dst[col*3+0] = (pixel >> 16) & 0xff;

+               dst[col*3+1] = (pixel >>  8) & 0xff;

+               dst[col*3+2] = (pixel >>  0) & 0xff;

+            }

+            dst += dstStride;

+            y += dy;

+         }

+         break;

+      case A8R8G8B8_UNORM_TO_BGRA_UINT:

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

+            const GLubyte *src = map + y * trans->stride;

+            memcpy(dst, src, 4 * width);

+            dst += dstStride;

+            y += dy;

+         }

+         break;

+      default:

+         ; /* nothing */

+      }

+

+      pipe_transfer_unmap(pipe, trans);

+      pipe->transfer_destroy(pipe, trans);

+   }

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Do glReadPixels by getting rows from the framebuffer transfer with

+ * get_tile().  Convert to requested format/type with Mesa image routines.

+ * Image transfer ops are done in software too.

+ */

+static void

+st_readpixels(struct gl_context *ctx, GLint x, GLint y, GLsizei width, GLsizei height,

+              GLenum format, GLenum type,

+              const struct gl_pixelstore_attrib *pack,

+              GLvoid *dest)

+{

+   struct st_context *st = st_context(ctx);

+   struct pipe_context *pipe = st->pipe;

+   GLfloat (*temp)[4];

+   const GLbitfield transferOps = ctx->_ImageTransferState;

+   GLsizei i, j;

+   GLint yStep, dfStride;

+   GLfloat *df;

+   struct st_renderbuffer *strb;

+   struct gl_pixelstore_attrib clippedPacking = *pack;

+   struct pipe_transfer *trans;

+

+   assert(ctx->ReadBuffer->Width > 0);

+

+   st_validate_state(st);

+

+   /* Do all needed clipping here, so that we can forget about it later */

+   if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {

+      /* The ReadPixels transfer is totally outside the window bounds */

+      return;

+   }

+

+   st_flush_bitmap_cache(st);

+

+   dest = _mesa_map_pbo_dest(ctx, &clippedPacking, dest);

+   if (!dest)

+      return;

+

+   if (format == GL_STENCIL_INDEX ||

+       format == GL_DEPTH_STENCIL) {

+      st_read_stencil_pixels(ctx, x, y, width, height,

+                             format, type, pack, dest);

+      return;

+   }

+   else if (format == GL_DEPTH_COMPONENT) {

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

+      if (strb->Base.Wrapped) {

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

+      }

+   }

+   else {

+      /* Read color buffer */

+      strb = st_get_color_read_renderbuffer(ctx);

+   }

+

+   if (!strb)

+      return;

+

+   /* try a fast-path readpixels before anything else */

+   if (st_fast_readpixels(ctx, strb, x, y, width, height,

+                          format, type, pack, dest)) {

+      /* success! */

+      _mesa_unmap_pbo_dest(ctx, &clippedPacking);

+      return;

+   }

+

+   /* allocate temp pixel row buffer */

+   temp = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));

+   if (!temp) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");

+      return;

+   }

+

+   if (format == GL_RGBA && type == GL_FLOAT) {

+      /* write tile(row) directly into user's buffer */

+      df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width,

+                                             height, format, type, 0, 0);

+      dfStride = width * 4;

+   }

+   else {

+      /* write tile(row) into temp row buffer */

+      df = (GLfloat *) temp;

+      dfStride = 0;

+   }

+

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

+      /* convert GL Y to Gallium Y */

+      y = strb->Base.Height - y - height;

+   }

+

+   /* Create a read transfer from the renderbuffer's texture */

+   trans = pipe_get_transfer(pipe, strb->texture,

+                             0, 0,

+                             PIPE_TRANSFER_READ,

+                             x, y, width, height);

+

+   /* determine bottom-to-top vs. top-to-bottom order */

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

+      y = height - 1;

+      yStep = -1;

+   }

+   else {

+      y = 0;

+      yStep = 1;

+   }

+

+   if (ST_DEBUG & DEBUG_FALLBACK)

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

+

+   /*

+    * Copy pixels from pipe_transfer to user memory

+    */

+   {

+      /* dest of first pixel in client memory */

+      GLubyte *dst = _mesa_image_address2d(&clippedPacking, dest, width,

+                                           height, format, type, 0, 0);

+      /* dest row stride */

+      const GLint dstStride = _mesa_image_row_stride(&clippedPacking, width,

+                                                     format, type);

+

+      if (trans->resource->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||

+          trans->resource->format == PIPE_FORMAT_Z24X8_UNORM) {

+         if (format == GL_DEPTH_COMPONENT) {

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

+               GLuint ztemp[MAX_WIDTH];

+               GLfloat zfloat[MAX_WIDTH];

+               const double scale = 1.0 / ((1 << 24) - 1);

+               pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);

+               y += yStep;

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

+                  zfloat[j] = (float) (scale * (ztemp[j] & 0xffffff));

+               }

+               _mesa_pack_depth_span(ctx, width, dst, type,

+                                     zfloat, &clippedPacking);

+               dst += dstStride;

+            }

+         }

+         else {

+            /* XXX: unreachable code -- should be before st_read_stencil_pixels */

+            assert(format == GL_DEPTH_STENCIL_EXT);

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

+               GLuint *zshort = (GLuint *)dst;

+               pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);

+               y += yStep;

+               /* Reverse into 24/8 */

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

+                  zshort[j] = (zshort[j] << 8) | (zshort[j] >> 24);

+               }

+               dst += dstStride;

+            }

+         }

+      }

+      else if (trans->resource->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||

+               trans->resource->format == PIPE_FORMAT_X8Z24_UNORM) {

+         if (format == GL_DEPTH_COMPONENT) {

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

+               GLuint ztemp[MAX_WIDTH];

+               GLfloat zfloat[MAX_WIDTH];

+               const double scale = 1.0 / ((1 << 24) - 1);

+               pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);

+               y += yStep;

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

+                  zfloat[j] = (float) (scale * ((ztemp[j] >> 8) & 0xffffff));

+               }

+               _mesa_pack_depth_span(ctx, width, dst, type,

+                                     zfloat, &clippedPacking);

+               dst += dstStride;

+            }

+         }

+         else {

+            /* XXX: unreachable code -- should be before st_read_stencil_pixels */

+            assert(format == GL_DEPTH_STENCIL_EXT);

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

+               pipe_get_tile_raw(pipe, trans, 0, y, width, 1, dst, 0);

+               y += yStep;

+               dst += dstStride;

+            }

+         }

+      }

+      else if (trans->resource->format == PIPE_FORMAT_Z16_UNORM) {

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

+            GLushort ztemp[MAX_WIDTH];

+            GLfloat zfloat[MAX_WIDTH];

+            const double scale = 1.0 / 0xffff;

+            pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);

+            y += yStep;

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

+               zfloat[j] = (float) (scale * ztemp[j]);

+            }

+            _mesa_pack_depth_span(ctx, width, dst, type,

+                                  zfloat, &clippedPacking);

+            dst += dstStride;

+         }

+      }

+      else if (trans->resource->format == PIPE_FORMAT_Z32_UNORM) {

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

+            GLuint ztemp[MAX_WIDTH];

+            GLfloat zfloat[MAX_WIDTH];

+            const double scale = 1.0 / 0xffffffff;

+            pipe_get_tile_raw(pipe, trans, 0, y, width, 1, ztemp, 0);

+            y += yStep;

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

+               zfloat[j] = (float) (scale * ztemp[j]);

+            }

+            _mesa_pack_depth_span(ctx, width, dst, type,

+                                  zfloat, &clippedPacking);

+            dst += dstStride;

+         }

+      }

+      else {

+         /* RGBA format */

+         /* Do a row at a time to flip image data vertically */

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

+            pipe_get_tile_rgba(pipe, trans, 0, y, width, 1, df);

+            y += yStep;

+            df += dfStride;

+            if (!dfStride) {

+               _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst,

+                                          &clippedPacking, transferOps);

+               dst += dstStride;

+            }

+         }

+      }

+   }

+

+   free(temp);

+

+   pipe->transfer_destroy(pipe, trans);

+

+   _mesa_unmap_pbo_dest(ctx, &clippedPacking);

+}

+

+

+void st_init_readpixels_functions(struct dd_function_table *functions)

+{

+   functions->ReadPixels = st_readpixels;

+}