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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2006 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portionsalloc
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28. #include "main/accum.h"
  29. #include "main/enums.h"
  30. #include "main/state.h"
  31. #include "main/bufferobj.h"
  32. #include "main/context.h"
  33. #include "swrast/swrast.h"
  34.  
  35. #include "brw_context.h"
  36. #include "intel_pixel.h"
  37.  
  38. #define FILE_DEBUG_FLAG DEBUG_PIXEL
  39.  
  40. static GLenum
  41. effective_func(GLenum func, bool src_alpha_is_one)
  42. {
  43.    if (src_alpha_is_one) {
  44.       if (func == GL_SRC_ALPHA)
  45.          return GL_ONE;
  46.       if (func == GL_ONE_MINUS_SRC_ALPHA)
  47.          return GL_ZERO;
  48.    }
  49.  
  50.    return func;
  51. }
  52.  
  53. /**
  54.  * Check if any fragment operations are in effect which might effect
  55.  * glDraw/CopyPixels.
  56.  */
  57. bool
  58. intel_check_blit_fragment_ops(struct gl_context * ctx, bool src_alpha_is_one)
  59. {
  60.    if (ctx->NewState)
  61.       _mesa_update_state(ctx);
  62.  
  63.    if (ctx->FragmentProgram._Enabled) {
  64.       DBG("fallback due to fragment program\n");
  65.       return false;
  66.    }
  67.  
  68.    if (ctx->Color.BlendEnabled &&
  69.        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
  70.         effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
  71.         ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
  72.         effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
  73.         effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
  74.         ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
  75.       DBG("fallback due to blend\n");
  76.       return false;
  77.    }
  78.  
  79.    if (ctx->Texture._MaxEnabledTexImageUnit != -1) {
  80.       DBG("fallback due to texturing\n");
  81.       return false;
  82.    }
  83.  
  84.    if (!(ctx->Color.ColorMask[0][0] &&
  85.          ctx->Color.ColorMask[0][1] &&
  86.          ctx->Color.ColorMask[0][2] &&
  87.          ctx->Color.ColorMask[0][3])) {
  88.       DBG("fallback due to color masking\n");
  89.       return false;
  90.    }
  91.  
  92.    if (ctx->Color.AlphaEnabled) {
  93.       DBG("fallback due to alpha\n");
  94.       return false;
  95.    }
  96.  
  97.    if (ctx->Depth.Test) {
  98.       DBG("fallback due to depth test\n");
  99.       return false;
  100.    }
  101.  
  102.    if (ctx->Fog.Enabled) {
  103.       DBG("fallback due to fog\n");
  104.       return false;
  105.    }
  106.  
  107.    if (ctx->_ImageTransferState) {
  108.       DBG("fallback due to image transfer\n");
  109.       return false;
  110.    }
  111.  
  112.    if (ctx->Stencil._Enabled) {
  113.       DBG("fallback due to image stencil\n");
  114.       return false;
  115.    }
  116.  
  117.    if (ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F) {
  118.       DBG("fallback due to pixel zoom\n");
  119.       return false;
  120.    }
  121.  
  122.    if (ctx->RenderMode != GL_RENDER) {
  123.       DBG("fallback due to render mode\n");
  124.       return false;
  125.    }
  126.  
  127.    return true;
  128. }
  129.  
  130. void
  131. intelInitPixelFuncs(struct dd_function_table *functions)
  132. {
  133.    functions->Accum = _mesa_accum;
  134.    functions->Bitmap = intelBitmap;
  135.    functions->CopyPixels = intelCopyPixels;
  136.    functions->DrawPixels = intelDrawPixels;
  137.    functions->ReadPixels = intelReadPixels;
  138. }
  139.  
  140.