1 files changed, 602 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
new file mode 100644
index 0000000000..fca1107d72
--- /dev/null
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -0,0 +1,602 @@
+/**************************************************************************
+ * 
+ * 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:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  *   Brian Paul
+  */
+
+#include "main/glheader.h"
+#include "main/macros.h"
+#include "shader/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_draw.h"
+#include "st_program.h"
+#include "st_public.h"
+#include "st_mesa_to_tgsi.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+#include "util/u_pack_color.h"
+#include "util/u_simple_shaders.h"
+#include "util/u_draw_quad.h"
+
+#include "cso_cache/cso_context.h"
+
+
+void
+st_init_clear(struct st_context *st)
+{
+   struct pipe_context *pipe = st->pipe;
+
+   /* rasterizer state: bypass clipping */
+   memset(&st->clear.raster, 0, sizeof(st->clear.raster));
+   st->clear.raster.gl_rasterization_rules = 1;
+   st->clear.raster.bypass_clipping = 1;
+
+   /* viewport state: identity since we're drawing in window coords */
+   st->clear.viewport.scale[0] = 1.0;
+   st->clear.viewport.scale[1] = 1.0;
+   st->clear.viewport.scale[2] = 1.0;
+   st->clear.viewport.scale[3] = 1.0;
+   st->clear.viewport.translate[0] = 0.0;
+   st->clear.viewport.translate[1] = 0.0;
+   st->clear.viewport.translate[2] = 0.0;
+   st->clear.viewport.translate[3] = 0.0;
+
+   /* fragment shader state: color pass-through program */
+   st->clear.fs =
+      util_make_fragment_passthrough_shader(pipe, &st->clear.frag_shader);
+
+   /* 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,
+                                                         &st->clear.vert_shader);
+   }
+}
+
+
+void
+st_destroy_clear(struct st_context *st)
+{
+   struct pipe_context *pipe = st->pipe;
+
+   if (st->clear.vert_shader.tokens) {
+      FREE((void *) st->clear.vert_shader.tokens);
+      st->clear.vert_shader.tokens = NULL;
+   }
+
+   if (st->clear.frag_shader.tokens) {
+      FREE((void *) st->clear.frag_shader.tokens);
+      st->clear.frag_shader.tokens = NULL;
+   }
+
+   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_buffer_reference(pipe->screen, &st->clear.vbuf, NULL);
+      st->clear.vbuf = NULL;
+   }
+}
+
+
+static GLboolean
+is_depth_stencil_format(enum pipe_format pipeFormat)
+{
+   switch (pipeFormat) {
+   case PIPE_FORMAT_S8Z24_UNORM:
+   case PIPE_FORMAT_Z24S8_UNORM:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+
+/**
+ * Draw a screen-aligned quadrilateral.
+ * Coords are window coords with y=0=bottom.  These coords will be transformed
+ * by the vertex shader and viewport transform (which will flip Y if needed).
+ */
+static void
+draw_quad(GLcontext *ctx,
+          float x0, float y0, float x1, float y1, GLfloat z,
+          const GLfloat color[4])
+{
+   struct st_context *st = ctx->st;
+   struct pipe_context *pipe = st->pipe;
+   const GLuint max_slots = 1024 / sizeof(st->clear.vertices);
+   GLuint i;
+   void *buf;
+
+   if (st->clear.vbuf_slot >= max_slots) {
+      pipe_buffer_reference(pipe->screen, &st->clear.vbuf, NULL);
+      st->clear.vbuf_slot = 0;
+   }
+
+   if (!st->clear.vbuf) {
+      st->clear.vbuf = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
+                                          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 */
+   buf = pipe_buffer_map(pipe->screen, st->clear.vbuf, PIPE_BUFFER_USAGE_CPU_WRITE);
+
+   memcpy((char *)buf + st->clear.vbuf_slot * sizeof(st->clear.vertices), 
+          st->clear.vertices, 
+          sizeof(st->clear.vertices));
+
+   pipe_buffer_unmap(pipe->screen, st->clear.vbuf);
+
+   /* 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(GLcontext *ctx,
+                GLboolean color, GLboolean depth, GLboolean stencil)
+{
+   struct st_context *st = ctx->st;
+   const GLfloat x0 = (GLfloat) ctx->DrawBuffer->_Xmin;
+   const GLfloat x1 = (GLfloat) ctx->DrawBuffer->_Xmax;
+   GLfloat y0, y1;
+
+   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
+      y0 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymax);
+      y1 = (GLfloat) (ctx->DrawBuffer->Height - ctx->DrawBuffer->_Ymin);
+   }
+   else {
+      y0 = (GLfloat) ctx->DrawBuffer->_Ymin;
+      y1 = (GLfloat) ctx->DrawBuffer->_Ymax;
+   }
+
+   /*
+   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_depth_stencil_alpha(st->cso_context);
+   cso_save_rasterizer(st->cso_context);
+   cso_save_viewport(st->cso_context);
+   cso_save_fragment_shader(st->cso_context);
+   cso_save_vertex_shader(st->cso_context);
+
+   /* blend state: RGBA masking */
+   {
+      struct pipe_blend_state blend;
+      memset(&blend, 0, sizeof(blend));
+      blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
+      blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
+      blend.rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
+      blend.alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
+      if (color) {
+         if (ctx->Color.ColorMask[0])
+            blend.colormask |= PIPE_MASK_R;
+         if (ctx->Color.ColorMask[1])
+            blend.colormask |= PIPE_MASK_G;
+         if (ctx->Color.ColorMask[2])
+            blend.colormask |= PIPE_MASK_B;
+         if (ctx->Color.ColorMask[3])
+            blend.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) {
+         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].ref_value = ctx->Stencil.Clear;
+         depth_stencil.stencil[0].value_mask = 0xff;
+         depth_stencil.stencil[0].write_mask = ctx->Stencil.WriteMask[0] & 0xff;
+      }
+
+      cso_set_depth_stencil_alpha(st->cso_context, &depth_stencil);
+   }
+
+   cso_set_rasterizer(st->cso_context, &st->clear.raster);
+   cso_set_viewport(st->cso_context, &st->clear.viewport);
+
+   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(ctx, x0, y0, x1, y1, (GLfloat) ctx->Depth.Clear, ctx->Color.ClearColor);
+
+   /* Restore pipe state */
+   cso_restore_blend(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_fragment_shader(st->cso_context);
+   cso_restore_vertex_shader(st->cso_context);
+}
+
+
+/**
+ * Determine if we need to clear the depth buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
+      return FALSE;
+
+   if (ctx->Scissor.Enabled)
+      return TRUE;
+
+   if (!ctx->Color.ColorMask[0] ||
+       !ctx->Color.ColorMask[1] ||
+       !ctx->Color.ColorMask[2] ||
+       !ctx->Color.ColorMask[3])
+      return TRUE;
+
+   return FALSE;
+}
+
+
+static INLINE GLboolean
+check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const struct st_renderbuffer *strb = st_renderbuffer(rb);
+   const GLuint stencilMax = (1 << rb->StencilBits) - 1;
+   GLboolean maskStencil
+      = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
+      return FALSE;
+
+   if (ctx->Scissor.Enabled)
+      return TRUE;
+
+   if (maskStencil)
+      return TRUE;
+
+   return FALSE;
+}
+
+
+/**
+ * Determine if we need to clear the depth buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const struct st_renderbuffer *strb = st_renderbuffer(rb);
+   const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
+
+   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
+      return FALSE;
+
+   if (ctx->Scissor.Enabled)
+      return TRUE;
+
+   if (isDS && 
+       strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
+       ctx->DrawBuffer->Visual.stencilBits > 0)
+      return TRUE;
+
+   return FALSE;
+}
+
+
+/**
+ * Determine if we need to clear the stencil buffer by drawing a quad.
+ */
+static INLINE GLboolean
+check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const struct st_renderbuffer *strb = st_renderbuffer(rb);
+   const GLboolean isDS = is_depth_stencil_format(strb->surface->format);
+   const GLuint stencilMax = (1 << rb->StencilBits) - 1;
+   const GLboolean maskStencil
+      = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
+
+   if (strb->surface->status == PIPE_SURFACE_STATUS_UNDEFINED)
+      return FALSE;
+
+   if (maskStencil) 
+      return TRUE;
+
+   if (ctx->Scissor.Enabled)
+      return 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 (isDS && 
+       strb->surface->status == PIPE_SURFACE_STATUS_DEFINED &&
+       ctx->DrawBuffer->Visual.depthBits > 0)
+      return TRUE;
+
+   return FALSE;
+}
+
+
+
+static void
+clear_color_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+   if (!strb->surface)
+      return;
+
+   if (check_clear_color_with_quad( ctx, rb )) {
+      /* masking or scissoring */
+      clear_with_quad(ctx, GL_TRUE, GL_FALSE, GL_FALSE);
+   }
+   else {
+      /* clear whole buffer w/out masking */
+      uint clearValue;
+      /* NOTE: we always pass the clear color as PIPE_FORMAT_A8R8G8B8_UNORM
+       * at this time!
+       */
+      util_pack_color(ctx->Color.ClearColor, PIPE_FORMAT_A8R8G8B8_UNORM, &clearValue);
+      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
+   }
+}
+
+
+static void
+clear_depth_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+   if (!strb->surface)
+      return;
+
+   if (check_clear_depth_with_quad(ctx, rb)) {
+      /* scissoring or we have a combined depth/stencil buffer */
+      clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_FALSE);
+   }
+   else {
+      /* simple clear of whole buffer */
+      uint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
+      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
+   }
+}
+
+
+static void
+clear_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+   if (!strb->surface)
+      return;
+
+   if (check_clear_stencil_with_quad(ctx, rb)) {
+      /* masking or scissoring or combined depth/stencil buffer */
+      clear_with_quad(ctx, GL_FALSE, GL_FALSE, GL_TRUE);
+   }
+   else {
+      /* simple clear of whole buffer */
+      GLuint clearValue = ctx->Stencil.Clear;
+
+      switch (strb->surface->format) {
+      case PIPE_FORMAT_S8Z24_UNORM:
+         clearValue <<= 24;
+         break;
+      default:
+         ; /* no-op, stencil value is in least significant bits */
+      }  
+
+      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
+   }
+}
+
+
+static void
+clear_depth_stencil_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   struct st_renderbuffer *strb = st_renderbuffer(rb);
+
+   if (!strb->surface)
+      return;
+
+   if (check_clear_depth_stencil_with_quad(ctx, rb)) {
+      /* masking or scissoring */
+      clear_with_quad(ctx, GL_FALSE, GL_TRUE, GL_TRUE);
+   }
+   else {
+      /* clear whole buffer w/out masking */
+      GLuint clearValue = util_pack_z(strb->surface->format, ctx->Depth.Clear);
+
+      switch (strb->surface->format) {
+      case PIPE_FORMAT_S8Z24_UNORM:
+         clearValue |= ctx->Stencil.Clear << 24;
+         break;
+      case PIPE_FORMAT_Z24S8_UNORM:
+         clearValue |= ctx->Stencil.Clear;
+         break;
+      default:
+         assert(0);
+      }  
+
+      ctx->st->pipe->clear(ctx->st->pipe, strb->surface, clearValue);
+   }
+}
+
+
+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_buffer_reference(st->pipe->screen, &st->clear.vbuf, NULL);
+   st->clear.vbuf_slot = 0;
+}
+ 
+
+
+/**
+ * Called via ctx->Driver.Clear()
+ * XXX: doesn't pick up the differences between front/back/left/right
+ * clears.  Need to sort that out...
+ */
+static void st_clear(GLcontext *ctx, GLbitfield mask)
+{
+   static const GLbitfield BUFFER_BITS_DS
+      = (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
+   struct st_context *st = ctx->st;
+   struct gl_renderbuffer *depthRb
+      = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+   struct gl_renderbuffer *stencilRb
+      = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+   GLbitfield cmask = mask & BUFFER_BITS_COLOR;
+
+   /* This makes sure the softpipe has the latest scissor, etc values */
+   st_validate_state( st );
+
+   /*
+    * XXX TO-DO:
+    * If we're going to use clear_with_quad() for any reason, use it to
+    * clear as many other buffers as possible.
+    * As it is now, we sometimes call clear_with_quad() three times to clear
+    * color/depth/stencil individually...
+    */
+
+   if (cmask) {
+      GLuint b;
+      for (b = 0; cmask; b++) {
+         if (cmask & (1 << b)) {
+            struct gl_renderbuffer *rb
+               = ctx->DrawBuffer->Attachment[b].Renderbuffer;
+            assert(rb);
+            clear_color_buffer(ctx, rb);
+            cmask &= ~(1 << b); /* turn off bit */
+         }
+         assert(b < BUFFER_COUNT);
+      }
+   }
+
+   if (mask & BUFFER_BIT_ACCUM) {
+      st_clear_accum_buffer(ctx,
+                       ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+   }
+
+   if ((mask & BUFFER_BITS_DS) == BUFFER_BITS_DS && depthRb == stencilRb) {
+      /* clearing combined depth + stencil */
+      clear_depth_stencil_buffer(ctx, depthRb);
+   }
+   else {
+      /* separate depth/stencil clears */
+      if (mask & BUFFER_BIT_DEPTH) {
+         clear_depth_buffer(ctx, depthRb);
+      }
+      if (mask & BUFFER_BIT_STENCIL) {
+         clear_stencil_buffer(ctx, stencilRb);
+      }
+   }
+}
+
+
+void st_init_clear_functions(struct dd_function_table *functions)
+{
+   functions->Clear = st_clear;
+}