src/mesa/drivers/dri/i915/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/stencil.h"
  32 #include "main/bufferobj.h"
  33 #include "main/context.h"
  34 #include "swrast/swrast.h"
  35
  36 #include "intel_context.h"
  37 #include "intel_pixel.h"
  38 #include "intel_regions.h"
  39
  40 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  41
  42 static GLenum
  43 effective_func(GLenum func, bool src_alpha_is_one)
  44 {
  45    if (src_alpha_is_one) {
  46       if (func == GL_SRC_ALPHA)
  47          return GL_ONE;
  48       if (func == GL_ONE_MINUS_SRC_ALPHA)
  49          return GL_ZERO;
  50    }
  51
  52    return func;
  53 }
  54
  55 /**
  56  * Check if any fragment operations are in effect which might effect
  57  * glDraw/CopyPixels.
  58  */
  59 bool
  60 intel_check_blit_fragment_ops(struct gl_context * ctx, bool src_alpha_is_one)
  61 {
  62    if (ctx->NewState)
  63       _mesa_update_state(ctx);
  64
  65    if (_mesa_arb_fragment_program_enabled(ctx)) {
  66       DBG("fallback due to fragment program\n");
  67       return false;
  68    }
  69
  70    if (ctx->Color.BlendEnabled &&
  71        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
  72         effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
  73         ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
  74         effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
  75         effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
  76         ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
  77       DBG("fallback due to blend\n");
  78       return false;
  79    }
  80
  81    if (ctx->Texture._MaxEnabledTexImageUnit != -1) {
  82       DBG("fallback due to texturing\n");
  83       return false;
  84    }
  85
  86    if (!(ctx->Color.ColorMask[0][0] &&
  87          ctx->Color.ColorMask[0][1] &&
  88          ctx->Color.ColorMask[0][2] &&
  89          ctx->Color.ColorMask[0][3])) {
  90       DBG("fallback due to color masking\n");
  91       return false;
  92    }
  93
  94    if (ctx->Color.AlphaEnabled) {
  95       DBG("fallback due to alpha\n");
  96       return false;
  97    }
  98
  99    if (ctx->Depth.Test) {
 100       DBG("fallback due to depth test\n");
 101       return false;
 102    }
 103
 104    if (ctx->Fog.Enabled) {
 105       DBG("fallback due to fog\n");
 106       return false;
 107    }
 108
 109    if (ctx->_ImageTransferState) {
 110       DBG("fallback due to image transfer\n");
 111       return false;
 112    }
 113
 114    if (_mesa_stencil_is_enabled(ctx)) {
 115       DBG("fallback due to image stencil\n");
 116       return false;
 117    }
 118
 119    if (ctx->RenderMode != GL_RENDER) {
 120       DBG("fallback due to render mode\n");
 121       return false;
 122    }
 123
 124    return true;
 125 }
 126
 127 void
 128 intelInitPixelFuncs(struct dd_function_table *functions)
 129 {
 130    functions->Bitmap = intelBitmap;
 131    functions->CopyPixels = intelCopyPixels;
 132    functions->DrawPixels = intelDrawPixels;
 133    functions->ReadPixels = intelReadPixels;
 134 }
 135