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Diffstat (limited to 'mesalib/src/mesa/state_tracker/st_cb_clear.c')
-rw-r--r--mesalib/src/mesa/state_tracker/st_cb_clear.c1122
1 files changed, 563 insertions, 559 deletions
diff --git a/mesalib/src/mesa/state_tracker/st_cb_clear.c b/mesalib/src/mesa/state_tracker/st_cb_clear.c
index 3e27be271..d2e0cd73c 100644
--- a/mesalib/src/mesa/state_tracker/st_cb_clear.c
+++ b/mesalib/src/mesa/state_tracker/st_cb_clear.c
@@ -1,559 +1,563 @@
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * All Rights Reserved.
- * Copyright 2009 VMware, Inc. 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:
- * Keith Whitwell <keith@tungstengraphics.com>
- * Brian Paul
- * Michel Dänzer
- */
-
-#include "main/glheader.h"
-#include "main/formats.h"
-#include "main/macros.h"
-#include "program/prog_instruction.h"
-#include "st_context.h"
-#include "st_atom.h"
-#include "st_cb_accum.h"
-#include "st_cb_clear.h"
-#include "st_cb_fbo.h"
-#include "st_program.h"
-
-#include "pipe/p_context.h"
-#include "pipe/p_shader_tokens.h"
-#include "pipe/p_state.h"
-#include "pipe/p_defines.h"
-#include "util/u_format.h"
-#include "util/u_inlines.h"
-#include "util/u_simple_shaders.h"
-#include "util/u_draw_quad.h"
-
-#include "cso_cache/cso_context.h"
-
-
-/**
- * Do per-context initialization for glClear.
- */
-void
-st_init_clear(struct st_context *st)
-{
- struct pipe_context *pipe = st->pipe;
- struct pipe_screen *pscreen = st->pipe->screen;
-
- memset(&st->clear, 0, sizeof(st->clear));
-
- st->clear.raster.gl_rasterization_rules = 1;
- st->clear.enable_ds_separate = pscreen->get_param(pscreen, PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE);
-
- /* fragment shader state: color pass-through program */
- st->clear.fs = util_make_fragment_passthrough_shader(pipe);
-
- /* vertex shader state: color/position pass-through */
- {
- const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
- TGSI_SEMANTIC_COLOR };
- const uint semantic_indexes[] = { 0, 0 };
- st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
- semantic_names,
- semantic_indexes);
- }
-}
-
-
-/**
- * Free per-context state for glClear.
- */
-void
-st_destroy_clear(struct st_context *st)
-{
- if (st->clear.fs) {
- cso_delete_fragment_shader(st->cso_context, st->clear.fs);
- st->clear.fs = NULL;
- }
- if (st->clear.vs) {
- cso_delete_vertex_shader(st->cso_context, st->clear.vs);
- st->clear.vs = NULL;
- }
- if (st->clear.vbuf) {
- pipe_resource_reference(&st->clear.vbuf, NULL);
- st->clear.vbuf = NULL;
- }
-}
-
-
-/**
- * Draw a screen-aligned quadrilateral.
- * Coords are clip coords with y=0=bottom.
- */
-static void
-draw_quad(struct st_context *st,
- float x0, float y0, float x1, float y1, GLfloat z,
- const GLfloat color[4])
-{
- struct pipe_context *pipe = st->pipe;
-
- /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
- * no_flush) updates to buffers where we know there is no conflict
- * with previous data. Currently using max_slots > 1 will cause
- * synchronous rendering if the driver flushes its command buffers
- * between one bitmap and the next. Our flush hook below isn't
- * sufficient to catch this as the driver doesn't tell us when it
- * flushes its own command buffers. Until this gets fixed, pay the
- * price of allocating a new buffer for each bitmap cache-flush to
- * avoid synchronous rendering.
- */
- const GLuint max_slots = 1; /* 1024 / sizeof(st->clear.vertices); */
- GLuint i;
-
- if (st->clear.vbuf_slot >= max_slots) {
- pipe_resource_reference(&st->clear.vbuf, NULL);
- st->clear.vbuf_slot = 0;
- }
-
- if (!st->clear.vbuf) {
- st->clear.vbuf = pipe_buffer_create(pipe->screen,
- PIPE_BIND_VERTEX_BUFFER,
- max_slots * sizeof(st->clear.vertices));
- }
-
- /* positions */
- st->clear.vertices[0][0][0] = x0;
- st->clear.vertices[0][0][1] = y0;
-
- st->clear.vertices[1][0][0] = x1;
- st->clear.vertices[1][0][1] = y0;
-
- st->clear.vertices[2][0][0] = x1;
- st->clear.vertices[2][0][1] = y1;
-
- st->clear.vertices[3][0][0] = x0;
- st->clear.vertices[3][0][1] = y1;
-
- /* same for all verts: */
- for (i = 0; i < 4; i++) {
- st->clear.vertices[i][0][2] = z;
- st->clear.vertices[i][0][3] = 1.0;
- st->clear.vertices[i][1][0] = color[0];
- st->clear.vertices[i][1][1] = color[1];
- st->clear.vertices[i][1][2] = color[2];
- st->clear.vertices[i][1][3] = color[3];
- }
-
- /* put vertex data into vbuf */
- pipe_buffer_write_nooverlap(st->pipe, st->clear.vbuf,
- st->clear.vbuf_slot
- * sizeof(st->clear.vertices),
- sizeof(st->clear.vertices),
- st->clear.vertices);
-
- /* draw */
- util_draw_vertex_buffer(pipe,
- st->clear.vbuf,
- st->clear.vbuf_slot * sizeof(st->clear.vertices),
- PIPE_PRIM_TRIANGLE_FAN,
- 4, /* verts */
- 2); /* attribs/vert */
-
- /* Increment slot */
- st->clear.vbuf_slot++;
-}
-
-
-
-/**
- * Do glClear by drawing a quadrilateral.
- * The vertices of the quad will be computed from the
- * ctx->DrawBuffer->_X/Ymin/max fields.
- */
-static void
-clear_with_quad(struct gl_context *ctx,
- GLboolean color, GLboolean depth, GLboolean stencil)
-{
- struct st_context *st = st_context(ctx);
- const struct gl_framebuffer *fb = ctx->DrawBuffer;
- const GLfloat fb_width = (GLfloat) fb->Width;
- const GLfloat fb_height = (GLfloat) fb->Height;
- const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
- const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
- const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
- const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
-
- /*
- printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
- color ? "color, " : "",
- depth ? "depth, " : "",
- stencil ? "stencil" : "",
- x0, y0,
- x1, y1);
- */
-
- cso_save_blend(st->cso_context);
- cso_save_stencil_ref(st->cso_context);
- cso_save_depth_stencil_alpha(st->cso_context);
- cso_save_rasterizer(st->cso_context);
- cso_save_viewport(st->cso_context);
- cso_save_clip(st->cso_context);
- cso_save_fragment_shader(st->cso_context);
- cso_save_vertex_shader(st->cso_context);
- cso_save_vertex_elements(st->cso_context);
-
- /* blend state: RGBA masking */
- {
- struct pipe_blend_state blend;
- memset(&blend, 0, sizeof(blend));
- blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
- blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
- blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
- blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
- if (color) {
- if (ctx->Color.ColorMask[0][0])
- blend.rt[0].colormask |= PIPE_MASK_R;
- if (ctx->Color.ColorMask[0][1])
- blend.rt[0].colormask |= PIPE_MASK_G;
- if (ctx->Color.ColorMask[0][2])
- blend.rt[0].colormask |= PIPE_MASK_B;
- if (ctx->Color.ColorMask[0][3])
- blend.rt[0].colormask |= PIPE_MASK_A;
- if (st->ctx->Color.DitherFlag)
- blend.dither = 1;
- }
- cso_set_blend(st->cso_context, &blend);
- }
-
- /* depth_stencil state: always pass/set to ref value */
- {
- struct pipe_depth_stencil_alpha_state depth_stencil;
- memset(&depth_stencil, 0, sizeof(depth_stencil));
- if (depth) {
- depth_stencil.depth.enabled = 1;
- depth_stencil.depth.writemask = 1;
- depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
- }
-
- if (stencil) {
- struct pipe_stencil_ref stencil_ref;
- memset(&stencil_ref, 0, sizeof(stencil_ref));
- depth_stencil.stencil[0].enabled = 1;
- depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
- depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
- depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
- depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
- depth_stencil.stencil[0].valuemask = 0xff;
- depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
- stencil_ref.ref_value[0] = ctx->Stencil.Clear;
- cso_set_stencil_ref(st->cso_context, &stencil_ref);
- }
-
- cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
- }
-
- cso_set_vertex_elements(st->cso_context, 2, st->velems_util_draw);
-
- cso_set_rasterizer(st->cso_context, &st->clear.raster);
-
- /* viewport state: viewport matching window dims */
- {
- const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
- struct pipe_viewport_state vp;
- vp.scale[0] = 0.5f * fb_width;
- vp.scale[1] = fb_height * (invert ? -0.5f : 0.5f);
- vp.scale[2] = 1.0f;
- vp.scale[3] = 1.0f;
- vp.translate[0] = 0.5f * fb_width;
- vp.translate[1] = 0.5f * fb_height;
- vp.translate[2] = 0.0f;
- vp.translate[3] = 0.0f;
- cso_set_viewport(st->cso_context, &vp);
- }
-
- cso_set_clip(st->cso_context, &st->clear.clip);
- cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
- cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
-
- /* draw quad matching scissor rect (XXX verify coord round-off) */
- draw_quad(st, x0, y0, x1, y1,
- (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);
-
- /* Restore pipe state */
- cso_restore_blend(st->cso_context);
- cso_restore_stencil_ref(st->cso_context);
- cso_restore_depth_stencil_alpha(st->cso_context);
- cso_restore_rasterizer(st->cso_context);
- cso_restore_viewport(st->cso_context);
- cso_restore_clip(st->cso_context);
- cso_restore_fragment_shader(st->cso_context);
- cso_restore_vertex_shader(st->cso_context);
- cso_restore_vertex_elements(st->cso_context);
-}
-
-
-/**
- * Determine if we need to clear the depth buffer by drawing a quad.
- */
-static INLINE GLboolean
-check_clear_color_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb)
-{
- if (ctx->Scissor.Enabled &&
- (ctx->Scissor.X != 0 ||
- ctx->Scissor.Y != 0 ||
- ctx->Scissor.Width < rb->Width ||
- ctx->Scissor.Height < rb->Height))
- return GL_TRUE;
-
- if (!ctx->Color.ColorMask[0][0] ||
- !ctx->Color.ColorMask[0][1] ||
- !ctx->Color.ColorMask[0][2] ||
- !ctx->Color.ColorMask[0][3])
- return GL_TRUE;
-
- return GL_FALSE;
-}
-
-
-/**
- * Determine if we need to clear the combiend depth/stencil buffer by
- * drawing a quad.
- */
-static INLINE GLboolean
-check_clear_depth_stencil_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb)
-{
- const GLuint stencilMax = 0xff;
- GLboolean maskStencil
- = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
-
- assert(rb->Format == MESA_FORMAT_S8 ||
- rb->Format == MESA_FORMAT_Z24_S8 ||
- rb->Format == MESA_FORMAT_S8_Z24);
-
- if (ctx->Scissor.Enabled &&
- (ctx->Scissor.X != 0 ||
- ctx->Scissor.Y != 0 ||
- ctx->Scissor.Width < rb->Width ||
- ctx->Scissor.Height < rb->Height))
- return GL_TRUE;
-
- if (maskStencil)
- return GL_TRUE;
-
- return GL_FALSE;
-}
-
-
-/**
- * Determine if we need to clear the depth buffer by drawing a quad.
- */
-static INLINE GLboolean
-check_clear_depth_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb,
- boolean ds_separate)
-{
- const struct st_renderbuffer *strb = st_renderbuffer(rb);
- const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
-
- if (ctx->Scissor.Enabled &&
- (ctx->Scissor.X != 0 ||
- ctx->Scissor.Y != 0 ||
- ctx->Scissor.Width < rb->Width ||
- ctx->Scissor.Height < rb->Height))
- return GL_TRUE;
-
- if (!ds_separate && isDS && ctx->DrawBuffer->Visual.stencilBits > 0)
- return GL_TRUE;
-
- return GL_FALSE;
-}
-
-
-/**
- * Determine if we need to clear the stencil buffer by drawing a quad.
- */
-static INLINE GLboolean
-check_clear_stencil_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb,
- boolean ds_separate)
-{
- const struct st_renderbuffer *strb = st_renderbuffer(rb);
- const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
- const GLuint stencilMax = 0xff;
- const GLboolean maskStencil
- = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
-
- assert(rb->Format == MESA_FORMAT_S8 ||
- rb->Format == MESA_FORMAT_Z24_S8 ||
- rb->Format == MESA_FORMAT_S8_Z24);
-
- if (maskStencil)
- return GL_TRUE;
-
- if (ctx->Scissor.Enabled &&
- (ctx->Scissor.X != 0 ||
- ctx->Scissor.Y != 0 ||
- ctx->Scissor.Width < rb->Width ||
- ctx->Scissor.Height < rb->Height))
- return GL_TRUE;
-
- /* This is correct, but it is necessary to look at the depth clear
- * value held in the surface when it comes time to issue the clear,
- * rather than taking depth and stencil clear values from the
- * current state.
- */
- if (!ds_separate && isDS && ctx->DrawBuffer->Visual.depthBits > 0)
- return GL_TRUE;
-
- return GL_FALSE;
-}
-
-
-
-/**
- * Called when we need to flush.
- */
-void
-st_flush_clear(struct st_context *st)
-{
- /* Release vertex buffer to avoid synchronous rendering if we were
- * to map it in the next frame.
- */
- pipe_resource_reference(&st->clear.vbuf, NULL);
- st->clear.vbuf_slot = 0;
-}
-
-
-
-/**
- * Called via ctx->Driver.Clear()
- */
-static void
-st_Clear(struct gl_context *ctx, GLbitfield mask)
-{
- static const GLbitfield BUFFER_BITS_DS
- = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
- struct st_context *st = st_context(ctx);
- struct gl_renderbuffer *depthRb
- = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
- struct gl_renderbuffer *stencilRb
- = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
- GLbitfield quad_buffers = 0x0;
- GLbitfield clear_buffers = 0x0;
- GLuint i;
-
- /* This makes sure the pipe has the latest scissor, etc values */
- st_validate_state( st );
-
- if (mask & BUFFER_BITS_COLOR) {
- for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
- GLuint b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
-
- if (mask & (1 << b)) {
- struct gl_renderbuffer *rb
- = ctx->DrawBuffer->Attachment[b].Renderbuffer;
- struct st_renderbuffer *strb = st_renderbuffer(rb);
-
- if (!strb || !strb->surface)
- continue;
-
- if (check_clear_color_with_quad( ctx, rb ))
- quad_buffers |= PIPE_CLEAR_COLOR;
- else
- clear_buffers |= PIPE_CLEAR_COLOR;
- }
- }
- }
-
- if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
- /* clearing combined depth + stencil */
- struct st_renderbuffer *strb = st_renderbuffer(depthRb);
-
- if (strb->surface) {
- if (check_clear_depth_stencil_with_quad(ctx, depthRb))
- quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
- else
- clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
- }
- }
- else {
- /* separate depth/stencil clears */
- /* I don't think truly separate buffers are actually possible in gallium or hw? */
- if (mask & BUFFER_BIT_DEPTH) {
- struct st_renderbuffer *strb = st_renderbuffer(depthRb);
-
- if (strb->surface) {
- if (check_clear_depth_with_quad(ctx, depthRb,
- st->clear.enable_ds_separate))
- quad_buffers |= PIPE_CLEAR_DEPTH;
- else
- clear_buffers |= PIPE_CLEAR_DEPTH;
- }
- }
- if (mask & BUFFER_BIT_STENCIL) {
- struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
-
- if (strb->surface) {
- if (check_clear_stencil_with_quad(ctx, stencilRb,
- st->clear.enable_ds_separate))
- quad_buffers |= PIPE_CLEAR_STENCIL;
- else
- clear_buffers |= PIPE_CLEAR_STENCIL;
- }
- }
- }
-
- /*
- * If we're going to use clear_with_quad() for any reason, use it for
- * everything possible.
- */
- if (quad_buffers) {
- quad_buffers |= clear_buffers;
- clear_with_quad(ctx,
- quad_buffers & PIPE_CLEAR_COLOR,
- quad_buffers & PIPE_CLEAR_DEPTH,
- quad_buffers & PIPE_CLEAR_STENCIL);
- } else if (clear_buffers) {
- /* driver cannot know it can clear everything if the buffer
- * is a combined depth/stencil buffer but this wasn't actually
- * required from the visual. Hence fix this up to avoid potential
- * read-modify-write in the driver.
- */
- if ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) &&
- ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) != PIPE_CLEAR_DEPTHSTENCIL) &&
- (depthRb == stencilRb) &&
- (ctx->DrawBuffer->Visual.depthBits == 0 ||
- ctx->DrawBuffer->Visual.stencilBits == 0))
- clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
- st->pipe->clear(st->pipe, clear_buffers, ctx->Color.ClearColor,
- ctx->Depth.Clear, ctx->Stencil.Clear);
- }
- if (mask & BUFFER_BIT_ACCUM)
- st_clear_accum_buffer(ctx,
- ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
-}
-
-
-void
-st_init_clear_functions(struct dd_function_table *functions)
-{
- functions->Clear = st_Clear;
-}
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * Copyright 2009 VMware, Inc. 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:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ * Brian Paul
+ * Michel Dänzer
+ */
+
+#include "main/glheader.h"
+#include "main/formats.h"
+#include "main/macros.h"
+#include "program/prog_instruction.h"
+#include "st_context.h"
+#include "st_atom.h"
+#include "st_cb_accum.h"
+#include "st_cb_clear.h"
+#include "st_cb_fbo.h"
+#include "st_program.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_shader_tokens.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+#include "util/u_format.h"
+#include "util/u_inlines.h"
+#include "util/u_simple_shaders.h"
+#include "util/u_draw_quad.h"
+
+#include "cso_cache/cso_context.h"
+
+
+/**
+ * Do per-context initialization for glClear.
+ */
+void
+st_init_clear(struct st_context *st)
+{
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *pscreen = st->pipe->screen;
+
+ memset(&st->clear, 0, sizeof(st->clear));
+
+ st->clear.raster.gl_rasterization_rules = 1;
+ st->clear.enable_ds_separate = pscreen->get_param(pscreen, PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE);
+
+ /* fragment shader state: color pass-through program */
+ st->clear.fs = util_make_fragment_passthrough_shader(pipe);
+
+ /* vertex shader state: color/position pass-through */
+ {
+ const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
+ TGSI_SEMANTIC_COLOR };
+ const uint semantic_indexes[] = { 0, 0 };
+ st->clear.vs = util_make_vertex_passthrough_shader(pipe, 2,
+ semantic_names,
+ semantic_indexes);
+ }
+}
+
+
+/**
+ * Free per-context state for glClear.
+ */
+void
+st_destroy_clear(struct st_context *st)
+{
+ if (st->clear.fs) {
+ cso_delete_fragment_shader(st->cso_context, st->clear.fs);
+ st->clear.fs = NULL;
+ }
+ if (st->clear.vs) {
+ cso_delete_vertex_shader(st->cso_context, st->clear.vs);
+ st->clear.vs = NULL;
+ }
+ if (st->clear.vbuf) {
+ pipe_resource_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf = NULL;
+ }
+}
+
+
+/**
+ * Draw a screen-aligned quadrilateral.
+ * Coords are clip coords with y=0=bottom.
+ */
+static void
+draw_quad(struct st_context *st,
+ float x0, float y0, float x1, float y1, GLfloat z,
+ const GLfloat color[4])
+{
+ struct pipe_context *pipe = st->pipe;
+
+ /* XXX: Need to improve buffer_write to allow NO_WAIT (as well as
+ * no_flush) updates to buffers where we know there is no conflict
+ * with previous data. Currently using max_slots > 1 will cause
+ * synchronous rendering if the driver flushes its command buffers
+ * between one bitmap and the next. Our flush hook below isn't
+ * sufficient to catch this as the driver doesn't tell us when it
+ * flushes its own command buffers. Until this gets fixed, pay the
+ * price of allocating a new buffer for each bitmap cache-flush to
+ * avoid synchronous rendering.
+ */
+ const GLuint max_slots = 1; /* 1024 / sizeof(st->clear.vertices); */
+ GLuint i;
+
+ if (st->clear.vbuf_slot >= max_slots) {
+ pipe_resource_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf_slot = 0;
+ }
+
+ if (!st->clear.vbuf) {
+ st->clear.vbuf = pipe_buffer_create(pipe->screen,
+ PIPE_BIND_VERTEX_BUFFER,
+ PIPE_USAGE_STREAM,
+ max_slots * sizeof(st->clear.vertices));
+ }
+
+ /* positions */
+ st->clear.vertices[0][0][0] = x0;
+ st->clear.vertices[0][0][1] = y0;
+
+ st->clear.vertices[1][0][0] = x1;
+ st->clear.vertices[1][0][1] = y0;
+
+ st->clear.vertices[2][0][0] = x1;
+ st->clear.vertices[2][0][1] = y1;
+
+ st->clear.vertices[3][0][0] = x0;
+ st->clear.vertices[3][0][1] = y1;
+
+ /* same for all verts: */
+ for (i = 0; i < 4; i++) {
+ st->clear.vertices[i][0][2] = z;
+ st->clear.vertices[i][0][3] = 1.0;
+ st->clear.vertices[i][1][0] = color[0];
+ st->clear.vertices[i][1][1] = color[1];
+ st->clear.vertices[i][1][2] = color[2];
+ st->clear.vertices[i][1][3] = color[3];
+ }
+
+ /* put vertex data into vbuf */
+ pipe_buffer_write_nooverlap(st->pipe, st->clear.vbuf,
+ st->clear.vbuf_slot
+ * sizeof(st->clear.vertices),
+ sizeof(st->clear.vertices),
+ st->clear.vertices);
+
+ /* draw */
+ util_draw_vertex_buffer(pipe,
+ st->cso_context,
+ st->clear.vbuf,
+ st->clear.vbuf_slot * sizeof(st->clear.vertices),
+ PIPE_PRIM_TRIANGLE_FAN,
+ 4, /* verts */
+ 2); /* attribs/vert */
+
+ /* Increment slot */
+ st->clear.vbuf_slot++;
+}
+
+
+
+/**
+ * Do glClear by drawing a quadrilateral.
+ * The vertices of the quad will be computed from the
+ * ctx->DrawBuffer->_X/Ymin/max fields.
+ */
+static void
+clear_with_quad(struct gl_context *ctx,
+ GLboolean color, GLboolean depth, GLboolean stencil)
+{
+ struct st_context *st = st_context(ctx);
+ const struct gl_framebuffer *fb = ctx->DrawBuffer;
+ const GLfloat fb_width = (GLfloat) fb->Width;
+ const GLfloat fb_height = (GLfloat) fb->Height;
+ const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin / fb_width * 2.0f - 1.0f;
+ const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax / fb_width * 2.0f - 1.0f;
+ const GLfloat y0 = (GLfloat) ctx->DrawBuffer->_Ymin / fb_height * 2.0f - 1.0f;
+ const GLfloat y1 = (GLfloat) ctx->DrawBuffer->_Ymax / fb_height * 2.0f - 1.0f;
+
+ /*
+ printf("%s %s%s%s %f,%f %f,%f\n", __FUNCTION__,
+ color ? "color, " : "",
+ depth ? "depth, " : "",
+ stencil ? "stencil" : "",
+ x0, y0,
+ x1, y1);
+ */
+
+ cso_save_blend(st->cso_context);
+ cso_save_stencil_ref(st->cso_context);
+ cso_save_depth_stencil_alpha(st->cso_context);
+ cso_save_rasterizer(st->cso_context);
+ cso_save_viewport(st->cso_context);
+ cso_save_clip(st->cso_context);
+ cso_save_fragment_shader(st->cso_context);
+ cso_save_vertex_shader(st->cso_context);
+ cso_save_vertex_elements(st->cso_context);
+ cso_save_vertex_buffers(st->cso_context);
+
+ /* blend state: RGBA masking */
+ {
+ struct pipe_blend_state blend;
+ memset(&blend, 0, sizeof(blend));
+ blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
+ blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
+ blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
+ blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
+ if (color) {
+ if (ctx->Color.ColorMask[0][0])
+ blend.rt[0].colormask |= PIPE_MASK_R;
+ if (ctx->Color.ColorMask[0][1])
+ blend.rt[0].colormask |= PIPE_MASK_G;
+ if (ctx->Color.ColorMask[0][2])
+ blend.rt[0].colormask |= PIPE_MASK_B;
+ if (ctx->Color.ColorMask[0][3])
+ blend.rt[0].colormask |= PIPE_MASK_A;
+ if (st->ctx->Color.DitherFlag)
+ blend.dither = 1;
+ }
+ cso_set_blend(st->cso_context, &blend);
+ }
+
+ /* depth_stencil state: always pass/set to ref value */
+ {
+ struct pipe_depth_stencil_alpha_state depth_stencil;
+ memset(&depth_stencil, 0, sizeof(depth_stencil));
+ if (depth) {
+ depth_stencil.depth.enabled = 1;
+ depth_stencil.depth.writemask = 1;
+ depth_stencil.depth.func = PIPE_FUNC_ALWAYS;
+ }
+
+ if (stencil) {
+ struct pipe_stencil_ref stencil_ref;
+ memset(&stencil_ref, 0, sizeof(stencil_ref));
+ depth_stencil.stencil[0].enabled = 1;
+ depth_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
+ depth_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
+ depth_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
+ depth_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
+ depth_stencil.stencil[0].valuemask = 0xff;
+ depth_stencil.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;
+ stencil_ref.ref_value[0] = ctx->Stencil.Clear;
+ cso_set_stencil_ref(st->cso_context, &stencil_ref);
+ }
+
+ cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
+ }
+
+ cso_set_vertex_elements(st->cso_context, 2, st->velems_util_draw);
+
+ cso_set_rasterizer(st->cso_context, &st->clear.raster);
+
+ /* viewport state: viewport matching window dims */
+ {
+ const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
+ struct pipe_viewport_state vp;
+ vp.scale[0] = 0.5f * fb_width;
+ vp.scale[1] = fb_height * (invert ? -0.5f : 0.5f);
+ vp.scale[2] = 1.0f;
+ vp.scale[3] = 1.0f;
+ vp.translate[0] = 0.5f * fb_width;
+ vp.translate[1] = 0.5f * fb_height;
+ vp.translate[2] = 0.0f;
+ vp.translate[3] = 0.0f;
+ cso_set_viewport(st->cso_context, &vp);
+ }
+
+ cso_set_clip(st->cso_context, &st->clear.clip);
+ cso_set_fragment_shader_handle(st->cso_context, st->clear.fs);
+ cso_set_vertex_shader_handle(st->cso_context, st->clear.vs);
+
+ /* draw quad matching scissor rect (XXX verify coord round-off) */
+ draw_quad(st, x0, y0, x1, y1,
+ (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);
+
+ /* Restore pipe state */
+ cso_restore_blend(st->cso_context);
+ cso_restore_stencil_ref(st->cso_context);
+ cso_restore_depth_stencil_alpha(st->cso_context);
+ cso_restore_rasterizer(st->cso_context);
+ cso_restore_viewport(st->cso_context);
+ cso_restore_clip(st->cso_context);
+ cso_restore_fragment_shader(st->cso_context);
+ cso_restore_vertex_shader(st->cso_context);
+ cso_restore_vertex_elements(st->cso_context);
+ cso_restore_vertex_buffers(st->cso_context);
+}
+
+
+/**
+ * Determine if we need to clear the depth buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_color_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb)
+{
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ return GL_TRUE;
+
+ if (!ctx->Color.ColorMask[0][0] ||
+ !ctx->Color.ColorMask[0][1] ||
+ !ctx->Color.ColorMask[0][2] ||
+ !ctx->Color.ColorMask[0][3])
+ return GL_TRUE;
+
+ return GL_FALSE;
+}
+
+
+/**
+ * Determine if we need to clear the combiend depth/stencil buffer by
+ * drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_depth_stencil_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb)
+{
+ const GLuint stencilMax = 0xff;
+ GLboolean maskStencil
+ = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+ assert(rb->Format == MESA_FORMAT_S8 ||
+ rb->Format == MESA_FORMAT_Z24_S8 ||
+ rb->Format == MESA_FORMAT_S8_Z24);
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ return GL_TRUE;
+
+ if (maskStencil)
+ return GL_TRUE;
+
+ return GL_FALSE;
+}
+
+
+/**
+ * Determine if we need to clear the depth buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_depth_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb,
+ boolean ds_separate)
+{
+ const struct st_renderbuffer *strb = st_renderbuffer(rb);
+ const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ return GL_TRUE;
+
+ if (!ds_separate && isDS && ctx->DrawBuffer->Visual.stencilBits > 0)
+ return GL_TRUE;
+
+ return GL_FALSE;
+}
+
+
+/**
+ * Determine if we need to clear the stencil buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_stencil_with_quad(struct gl_context *ctx, struct gl_renderbuffer *rb,
+ boolean ds_separate)
+{
+ const struct st_renderbuffer *strb = st_renderbuffer(rb);
+ const GLboolean isDS = util_format_is_depth_and_stencil(strb->surface->format);
+ const GLuint stencilMax = 0xff;
+ const GLboolean maskStencil
+ = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+ assert(rb->Format == MESA_FORMAT_S8 ||
+ rb->Format == MESA_FORMAT_Z24_S8 ||
+ rb->Format == MESA_FORMAT_S8_Z24);
+
+ if (maskStencil)
+ return GL_TRUE;
+
+ if (ctx->Scissor.Enabled &&
+ (ctx->Scissor.X != 0 ||
+ ctx->Scissor.Y != 0 ||
+ ctx->Scissor.Width < rb->Width ||
+ ctx->Scissor.Height < rb->Height))
+ return GL_TRUE;
+
+ /* This is correct, but it is necessary to look at the depth clear
+ * value held in the surface when it comes time to issue the clear,
+ * rather than taking depth and stencil clear values from the
+ * current state.
+ */
+ if (!ds_separate && isDS && ctx->DrawBuffer->Visual.depthBits > 0)
+ return GL_TRUE;
+
+ return GL_FALSE;
+}
+
+
+
+/**
+ * Called when we need to flush.
+ */
+void
+st_flush_clear(struct st_context *st)
+{
+ /* Release vertex buffer to avoid synchronous rendering if we were
+ * to map it in the next frame.
+ */
+ pipe_resource_reference(&st->clear.vbuf, NULL);
+ st->clear.vbuf_slot = 0;
+}
+
+
+
+/**
+ * Called via ctx->Driver.Clear()
+ */
+static void
+st_Clear(struct gl_context *ctx, GLbitfield mask)
+{
+ static const GLbitfield BUFFER_BITS_DS
+ = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
+ struct st_context *st = st_context(ctx);
+ struct gl_renderbuffer *depthRb
+ = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+ struct gl_renderbuffer *stencilRb
+ = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+ GLbitfield quad_buffers = 0x0;
+ GLbitfield clear_buffers = 0x0;
+ GLuint i;
+
+ /* This makes sure the pipe has the latest scissor, etc values */
+ st_validate_state( st );
+
+ if (mask & BUFFER_BITS_COLOR) {
+ for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
+ GLuint b = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
+
+ if (mask & (1 << b)) {
+ struct gl_renderbuffer *rb
+ = ctx->DrawBuffer->Attachment[b].Renderbuffer;
+ struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+ if (!strb || !strb->surface)
+ continue;
+
+ if (check_clear_color_with_quad( ctx, rb ))
+ quad_buffers |= PIPE_CLEAR_COLOR;
+ else
+ clear_buffers |= PIPE_CLEAR_COLOR;
+ }
+ }
+ }
+
+ if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
+ /* clearing combined depth + stencil */
+ struct st_renderbuffer *strb = st_renderbuffer(depthRb);
+
+ if (strb->surface) {
+ if (check_clear_depth_stencil_with_quad(ctx, depthRb))
+ quad_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ else
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ }
+ }
+ else {
+ /* separate depth/stencil clears */
+ /* I don't think truly separate buffers are actually possible in gallium or hw? */
+ if (mask & BUFFER_BIT_DEPTH) {
+ struct st_renderbuffer *strb = st_renderbuffer(depthRb);
+
+ if (strb->surface) {
+ if (check_clear_depth_with_quad(ctx, depthRb,
+ st->clear.enable_ds_separate))
+ quad_buffers |= PIPE_CLEAR_DEPTH;
+ else
+ clear_buffers |= PIPE_CLEAR_DEPTH;
+ }
+ }
+ if (mask & BUFFER_BIT_STENCIL) {
+ struct st_renderbuffer *strb = st_renderbuffer(stencilRb);
+
+ if (strb->surface) {
+ if (check_clear_stencil_with_quad(ctx, stencilRb,
+ st->clear.enable_ds_separate))
+ quad_buffers |= PIPE_CLEAR_STENCIL;
+ else
+ clear_buffers |= PIPE_CLEAR_STENCIL;
+ }
+ }
+ }
+
+ /*
+ * If we're going to use clear_with_quad() for any reason, use it for
+ * everything possible.
+ */
+ if (quad_buffers) {
+ quad_buffers |= clear_buffers;
+ clear_with_quad(ctx,
+ quad_buffers & PIPE_CLEAR_COLOR,
+ quad_buffers & PIPE_CLEAR_DEPTH,
+ quad_buffers & PIPE_CLEAR_STENCIL);
+ } else if (clear_buffers) {
+ /* driver cannot know it can clear everything if the buffer
+ * is a combined depth/stencil buffer but this wasn't actually
+ * required from the visual. Hence fix this up to avoid potential
+ * read-modify-write in the driver.
+ */
+ if ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) &&
+ ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) != PIPE_CLEAR_DEPTHSTENCIL) &&
+ (depthRb == stencilRb) &&
+ (ctx->DrawBuffer->Visual.depthBits == 0 ||
+ ctx->DrawBuffer->Visual.stencilBits == 0))
+ clear_buffers |= PIPE_CLEAR_DEPTHSTENCIL;
+ st->pipe->clear(st->pipe, clear_buffers, ctx->Color.ClearColor,
+ ctx->Depth.Clear, ctx->Stencil.Clear);
+ }
+ if (mask & BUFFER_BIT_ACCUM)
+ st_clear_accum_buffer(ctx,
+ ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+}
+
+
+void
+st_init_clear_functions(struct dd_function_table *functions)
+{
+ functions->Clear = st_Clear;
+}