intel: move glClear-related code into new intel_clear.c file

1 files changed, 260 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_clear.c b/src/mesa/drivers/dri/intel/intel_clear.c
new file mode 100644
index 0000000000..921ec2dc33
--- /dev/null
+++ b/src/mesa/drivers/dri/intel/intel_clear.c
@@ -0,0 +1,260 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 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.
+ * 
+ **************************************************************************/
+
+#include "intel_clear.h"
+#include "intel_context.h"
+#include "intel_blit.h"
+#include "intel_buffers.h"
+#include "intel_chipset.h"
+#include "intel_fbo.h"
+#include "intel_regions.h"
+#include "intel_batchbuffer.h"
+#include "main/framebuffer.h"
+#include "swrast/swrast.h"
+#include "drirenderbuffer.h"
+
+#define FILE_DEBUG_FLAG DEBUG_BLIT
+
+/* A true meta version of this would be very simple and additionally
+ * machine independent.  Maybe we'll get there one day.
+ */
+static void
+intelClearWithTris(struct intel_context *intel, GLbitfield mask)
+{
+   GLcontext *ctx = &intel->ctx;
+   struct gl_framebuffer *fb = ctx->DrawBuffer;
+   GLuint buf;
+
+   intel->vtbl.install_meta_state(intel);
+
+   /* Back and stencil cliprects are the same.  Try and do both
+    * buffers at once:
+    */
+   if (mask & (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) {
+      struct intel_region *backRegion =
+	 intel_get_rb_region(fb, BUFFER_BACK_LEFT);
+      struct intel_region *depthRegion =
+	 intel_get_rb_region(fb, BUFFER_DEPTH);
+
+      intel->vtbl.meta_draw_region(intel, backRegion, depthRegion);
+
+      if (mask & BUFFER_BIT_BACK_LEFT)
+	 intel->vtbl.meta_color_mask(intel, GL_TRUE);
+      else
+	 intel->vtbl.meta_color_mask(intel, GL_FALSE);
+
+      if (mask & BUFFER_BIT_STENCIL)
+	 intel->vtbl.meta_stencil_replace(intel,
+					  intel->ctx.Stencil.WriteMask[0],
+					  intel->ctx.Stencil.Clear);
+      else
+	 intel->vtbl.meta_no_stencil_write(intel);
+
+      if (mask & BUFFER_BIT_DEPTH)
+	 intel->vtbl.meta_depth_replace(intel);
+      else
+	 intel->vtbl.meta_no_depth_write(intel);
+
+      intel->vtbl.meta_draw_quad(intel,
+				 fb->_Xmin,
+				 fb->_Xmax,
+				 fb->_Ymin,
+				 fb->_Ymax,
+				 intel->ctx.Depth.Clear,
+				 intel->ClearColor8888,
+				 0, 0, 0, 0);   /* texcoords */
+
+      mask &= ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH);
+   }
+
+   /* clear the remaining (color) renderbuffers */
+   for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
+      const GLuint bufBit = 1 << buf;
+      if (mask & bufBit) {
+	 struct intel_renderbuffer *irbColor =
+	    intel_renderbuffer(fb->Attachment[buf].Renderbuffer);
+
+	 ASSERT(irbColor);
+
+	 intel->vtbl.meta_no_depth_write(intel);
+	 intel->vtbl.meta_no_stencil_write(intel);
+	 intel->vtbl.meta_color_mask(intel, GL_TRUE);
+	 intel->vtbl.meta_draw_region(intel, irbColor->region, NULL);
+
+	 intel->vtbl.meta_draw_quad(intel,
+				    fb->_Xmin,
+				    fb->_Xmax,
+				    fb->_Ymin,
+				    fb->_Ymax,
+				    0, intel->ClearColor8888,
+				    0, 0, 0, 0);   /* texcoords */
+
+	 mask &= ~bufBit;
+      }
+   }
+
+   intel->vtbl.leave_meta_state(intel);
+}
+
+static const char *buffer_names[] = {
+   [BUFFER_FRONT_LEFT] = "front",
+   [BUFFER_BACK_LEFT] = "back",
+   [BUFFER_FRONT_RIGHT] = "front right",
+   [BUFFER_BACK_RIGHT] = "back right",
+   [BUFFER_AUX0] = "aux0",
+   [BUFFER_AUX1] = "aux1",
+   [BUFFER_AUX2] = "aux2",
+   [BUFFER_AUX3] = "aux3",
+   [BUFFER_DEPTH] = "depth",
+   [BUFFER_STENCIL] = "stencil",
+   [BUFFER_ACCUM] = "accum",
+   [BUFFER_COLOR0] = "color0",
+   [BUFFER_COLOR1] = "color1",
+   [BUFFER_COLOR2] = "color2",
+   [BUFFER_COLOR3] = "color3",
+   [BUFFER_COLOR4] = "color4",
+   [BUFFER_COLOR5] = "color5",
+   [BUFFER_COLOR6] = "color6",
+   [BUFFER_COLOR7] = "color7",
+};
+
+/**
+ * Called by ctx->Driver.Clear.
+ */
+static void
+intelClear(GLcontext *ctx, GLbitfield mask)
+{
+   struct intel_context *intel = intel_context(ctx);
+   const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
+   GLbitfield tri_mask = 0;
+   GLbitfield blit_mask = 0;
+   GLbitfield swrast_mask = 0;
+   struct gl_framebuffer *fb = ctx->DrawBuffer;
+   GLuint i;
+
+   if (0)
+      fprintf(stderr, "%s\n", __FUNCTION__);
+
+   /* HW color buffers (front, back, aux, generic FBO, etc) */
+   if (colorMask == ~0) {
+      /* clear all R,G,B,A */
+      /* XXX FBO: need to check if colorbuffers are software RBOs! */
+      blit_mask |= (mask & BUFFER_BITS_COLOR);
+   }
+   else {
+      /* glColorMask in effect */
+      tri_mask |= (mask & BUFFER_BITS_COLOR);
+   }
+
+   /* HW stencil */
+   if (mask & BUFFER_BIT_STENCIL) {
+      const struct intel_region *stencilRegion
+         = intel_get_rb_region(fb, BUFFER_STENCIL);
+      if (stencilRegion) {
+         /* have hw stencil */
+         if (IS_965(intel->intelScreen->deviceID) ||
+	     (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
+	    /* We have to use the 3D engine if we're clearing a partial mask
+	     * of the stencil buffer, or if we're on a 965 which has a tiled
+	     * depth/stencil buffer in a layout we can't blit to.
+	     */
+            tri_mask |= BUFFER_BIT_STENCIL;
+         }
+         else {
+            /* clearing all stencil bits, use blitting */
+            blit_mask |= BUFFER_BIT_STENCIL;
+         }
+      }
+   }
+
+   /* HW depth */
+   if (mask & BUFFER_BIT_DEPTH) {
+      /* clear depth with whatever method is used for stencil (see above) */
+      if (IS_965(intel->intelScreen->deviceID) ||
+	  tri_mask & BUFFER_BIT_STENCIL)
+         tri_mask |= BUFFER_BIT_DEPTH;
+      else
+         blit_mask |= BUFFER_BIT_DEPTH;
+   }
+
+   /* SW fallback clearing */
+   swrast_mask = mask & ~tri_mask & ~blit_mask;
+
+   for (i = 0; i < BUFFER_COUNT; i++) {
+      GLuint bufBit = 1 << i;
+      if ((blit_mask | tri_mask) & bufBit) {
+         if (!fb->Attachment[i].Renderbuffer->ClassID) {
+            blit_mask &= ~bufBit;
+            tri_mask &= ~bufBit;
+            swrast_mask |= bufBit;
+         }
+      }
+   }
+
+   if (blit_mask) {
+      if (INTEL_DEBUG & DEBUG_BLIT) {
+	 DBG("blit clear:");
+	 for (i = 0; i < BUFFER_COUNT; i++) {
+	    if (blit_mask & (1 << i))
+	       DBG(" %s", buffer_names[i]);
+	 }
+	 DBG("\n");
+      }
+      intelClearWithBlit(ctx, blit_mask);
+   }
+
+   if (tri_mask) {
+      if (INTEL_DEBUG & DEBUG_BLIT) {
+	 DBG("tri clear:");
+	 for (i = 0; i < BUFFER_COUNT; i++) {
+	    if (tri_mask & (1 << i))
+	       DBG(" %s", buffer_names[i]);
+	 }
+	 DBG("\n");
+      }
+      intelClearWithTris(intel, tri_mask);
+   }
+
+   if (swrast_mask) {
+      if (INTEL_DEBUG & DEBUG_BLIT) {
+	 DBG("swrast clear:");
+	 for (i = 0; i < BUFFER_COUNT; i++) {
+	    if (swrast_mask & (1 << i))
+	       DBG(" %s", buffer_names[i]);
+	 }
+	 DBG("\n");
+      }
+      _swrast_Clear(ctx, swrast_mask);
+   }
+}
+
+
+void
+intelInitClearFuncs(struct dd_function_table *functions)
+{
+   functions->Clear = intelClear;
+}