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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
  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 TUNGSTEN GRAPHICS 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. #include "intel_regions.h"
  38.  
  39. #define FILE_DEBUG_FLAG DEBUG_PIXEL
  40.  
  41. static GLenum
  42. effective_func(GLenum func, bool src_alpha_is_one)
  43. {
  44.    if (src_alpha_is_one) {
  45.       if (func == GL_SRC_ALPHA)
  46.          return GL_ONE;
  47.       if (func == GL_ONE_MINUS_SRC_ALPHA)
  48.          return GL_ZERO;
  49.    }
  50.  
  51.    return func;
  52. }
  53.  
  54. /**
  55.  * Check if any fragment operations are in effect which might effect
  56.  * glDraw/CopyPixels.
  57.  */
  58. bool
  59. intel_check_blit_fragment_ops(struct gl_context * ctx, bool src_alpha_is_one)
  60. {
  61.    if (ctx->NewState)
  62.       _mesa_update_state(ctx);
  63.  
  64.    if (ctx->FragmentProgram._Enabled) {
  65.       DBG("fallback due to fragment program\n");
  66.       return false;
  67.    }
  68.  
  69.    if (ctx->Color.BlendEnabled &&
  70.        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
  71.         effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
  72.         ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
  73.         effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
  74.         effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
  75.         ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
  76.       DBG("fallback due to blend\n");
  77.       return false;
  78.    }
  79.  
  80.    if (ctx->Texture._EnabledUnits) {
  81.       DBG("fallback due to texturing\n");
  82.       return false;
  83.    }
  84.  
  85.    if (!(ctx->Color.ColorMask[0][0] &&
  86.          ctx->Color.ColorMask[0][1] &&
  87.          ctx->Color.ColorMask[0][2] &&
  88.          ctx->Color.ColorMask[0][3])) {
  89.       DBG("fallback due to color masking\n");
  90.       return false;
  91.    }
  92.  
  93.    if (ctx->Color.AlphaEnabled) {
  94.       DBG("fallback due to alpha\n");
  95.       return false;
  96.    }
  97.  
  98.    if (ctx->Depth.Test) {
  99.       DBG("fallback due to depth test\n");
  100.       return false;
  101.    }
  102.  
  103.    if (ctx->Fog.Enabled) {
  104.       DBG("fallback due to fog\n");
  105.       return false;
  106.    }
  107.  
  108.    if (ctx->_ImageTransferState) {
  109.       DBG("fallback due to image transfer\n");
  110.       return false;
  111.    }
  112.  
  113.    if (ctx->Stencil._Enabled) {
  114.       DBG("fallback due to image stencil\n");
  115.       return false;
  116.    }
  117.  
  118.    if (ctx->RenderMode != GL_RENDER) {
  119.       DBG("fallback due to render mode\n");
  120.       return false;
  121.    }
  122.  
  123.    return true;
  124. }
  125.  
  126. void
  127. intelInitPixelFuncs(struct dd_function_table *functions)
  128. {
  129.    functions->Accum = _mesa_accum;
  130.    functions->Bitmap = intelBitmap;
  131.    functions->CopyPixels = intelCopyPixels;
  132.    functions->DrawPixels = intelDrawPixels;
  133.    functions->ReadPixels = intelReadPixels;
  134. }
  135.  
  136.