src/mesa/drivers/dri/i965/intel_pixel.c

   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