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

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