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 #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->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F) {
 119       DBG("fallback due to pixel zoom\n");
 120       return false;
 121    }
 122
 123    if (ctx->RenderMode != GL_RENDER) {
 124       DBG("fallback due to render mode\n");
 125       return false;
 126    }
 127
 128    return true;
 129 }
 130
 131 void
 132 intelInitPixelFuncs(struct dd_function_table *functions)
 133 {
 134    functions->Accum = _mesa_accum;
 135    functions->Bitmap = intelBitmap;
 136    functions->CopyPixels = intelCopyPixels;
 137    functions->DrawPixels = intelDrawPixels;
 138    functions->ReadPixels = intelReadPixels;
 139 }
 140