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/bufferobj.h"
  30 #include "main/context.h"
  31 #include "swrast/swrast.h"
  32
  33 #include "brw_context.h"
  34 #include "intel_pixel.h"
  35
  36 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  37
  38 static GLenum
  39 effective_func(GLenum func, bool src_alpha_is_one)
  40 {
  41    if (src_alpha_is_one) {
  42       if (func == GL_SRC_ALPHA)
  43          return GL_ONE;
  44       if (func == GL_ONE_MINUS_SRC_ALPHA)
  45          return GL_ZERO;
  46    }
  47
  48    return func;
  49 }
  50
  51 /**
  52  * Check if any fragment operations are in effect which might effect
  53  * glDraw/CopyPixels.
  54  */
  55 bool
  56 intel_check_blit_fragment_ops(struct gl_context * ctx, bool src_alpha_is_one)
  57 {
  58    if (ctx->NewState)
  59       _mesa_update_state(ctx);
  60
  61    if (ctx->FragmentProgram._Enabled) {
  62       DBG("fallback due to fragment program\n");
  63       return false;
  64    }
  65
  66    if (ctx->Color.BlendEnabled &&
  67        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
  68         effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
  69         ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
  70         effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
  71         effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
  72         ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
  73       DBG("fallback due to blend\n");
  74       return false;
  75    }
  76
  77    if (ctx->Texture._MaxEnabledTexImageUnit != -1) {
  78       DBG("fallback due to texturing\n");
  79       return false;
  80    }
  81
  82    if (!(ctx->Color.ColorMask[0][0] &&
  83          ctx->Color.ColorMask[0][1] &&
  84          ctx->Color.ColorMask[0][2] &&
  85          ctx->Color.ColorMask[0][3])) {
  86       DBG("fallback due to color masking\n");
  87       return false;
  88    }
  89
  90    if (ctx->Color.AlphaEnabled) {
  91       DBG("fallback due to alpha\n");
  92       return false;
  93    }
  94
  95    if (ctx->Depth.Test) {
  96       DBG("fallback due to depth test\n");
  97       return false;
  98    }
  99
 100    if (ctx->Fog.Enabled) {
 101       DBG("fallback due to fog\n");
 102       return false;
 103    }
 104
 105    if (ctx->_ImageTransferState) {
 106       DBG("fallback due to image transfer\n");
 107       return false;
 108    }
 109
 110    if (ctx->Stencil._Enabled) {
 111       DBG("fallback due to image stencil\n");
 112       return false;
 113    }
 114
 115    if (ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F) {
 116       DBG("fallback due to pixel zoom\n");
 117       return false;
 118    }
 119
 120    if (ctx->RenderMode != GL_RENDER) {
 121       DBG("fallback due to render mode\n");
 122       return false;
 123    }
 124
 125    return true;
 126 }
 127
 128 void
 129 intelInitPixelFuncs(struct dd_function_table *functions)
 130 {
 131    functions->Accum = _mesa_accum;
 132    functions->Bitmap = intelBitmap;
 133    functions->CopyPixels = intelCopyPixels;
 134    functions->DrawPixels = intelDrawPixels;
 135    functions->ReadPixels = intelReadPixels;
 136 }
 137