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

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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/enums.h"
  29 #include "main/state.h"
  30 #include "main/bufferobj.h"
  31 #include "main/context.h"
  32 #include "swrast/swrast.h"
  33
  34 #include "intel_context.h"
  35 #include "intel_pixel.h"
  36 #include "intel_regions.h"
  37
  38 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  39
  40 static GLenum
  41 effective_func(GLenum func, GLboolean 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 GLboolean
  58 intel_check_blit_fragment_ops(struct gl_context * ctx, GLboolean 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 GL_FALSE;
  66    }
  67
  68    if (ctx->Color.BlendEnabled &&
  69        (effective_func(ctx->Color.BlendSrcRGB, src_alpha_is_one) != GL_ONE ||
  70         effective_func(ctx->Color.BlendDstRGB, src_alpha_is_one) != GL_ZERO ||
  71         ctx->Color.BlendEquationRGB != GL_FUNC_ADD ||
  72         effective_func(ctx->Color.BlendSrcA, src_alpha_is_one) != GL_ONE ||
  73         effective_func(ctx->Color.BlendDstA, src_alpha_is_one) != GL_ZERO ||
  74         ctx->Color.BlendEquationA != GL_FUNC_ADD)) {
  75       DBG("fallback due to blend\n");
  76       return GL_FALSE;
  77    }
  78
  79    if (ctx->Texture._EnabledUnits) {
  80       DBG("fallback due to texturing\n");
  81       return GL_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 GL_FALSE;
  90    }
  91
  92    if (ctx->Color.AlphaEnabled) {
  93       DBG("fallback due to alpha\n");
  94       return GL_FALSE;
  95    }
  96
  97    if (ctx->Depth.Test) {
  98       DBG("fallback due to depth test\n");
  99       return GL_FALSE;
 100    }
 101
 102    if (ctx->Fog.Enabled) {
 103       DBG("fallback due to fog\n");
 104       return GL_FALSE;
 105    }
 106
 107    if (ctx->_ImageTransferState) {
 108       DBG("fallback due to image transfer\n");
 109       return GL_FALSE;
 110    }
 111
 112    if (ctx->Stencil._Enabled) {
 113       DBG("fallback due to image stencil\n");
 114       return GL_FALSE;
 115    }
 116
 117    if (ctx->RenderMode != GL_RENDER) {
 118       DBG("fallback due to render mode\n");
 119       return GL_FALSE;
 120    }
 121
 122    return GL_TRUE;
 123 }
 124
 125 /* The intel_region struct doesn't really do enough to capture the
 126  * format of the pixels in the region.  For now this code assumes that
 127  * the region is a display surface and hence is either ARGB8888 or
 128  * RGB565.
 129  * XXX FBO: If we'd pass in the intel_renderbuffer instead of region, we'd
 130  * know the buffer's pixel format.
 131  *
 132  * \param format  as given to glDraw/ReadPixels
 133  * \param type  as given to glDraw/ReadPixels
 134  */
 135 GLboolean
 136 intel_check_blit_format(struct intel_region * region,
 137                         GLenum format, GLenum type)
 138 {
 139    if (region->cpp == 4 &&
 140        (type == GL_UNSIGNED_INT_8_8_8_8_REV ||
 141         type == GL_UNSIGNED_BYTE) && format == GL_BGRA) {
 142       return GL_TRUE;
 143    }
 144
 145    if (region->cpp == 2 &&
 146        type == GL_UNSIGNED_SHORT_5_6_5_REV && format == GL_BGR) {
 147       return GL_TRUE;
 148    }
 149
 150    DBG("%s: bad format for blit (cpp %d, type %s format %s)\n",
 151        __FUNCTION__, region->cpp,
 152        _mesa_lookup_enum_by_nr(type), _mesa_lookup_enum_by_nr(format));
 153
 154    return GL_FALSE;
 155 }
 156
 157 void
 158 intelInitPixelFuncs(struct dd_function_table *functions)
 159 {
 160    functions->Accum = _swrast_Accum;
 161    if (!getenv("INTEL_NO_BLIT")) {
 162       functions->Bitmap = intelBitmap;
 163       functions->CopyPixels = intelCopyPixels;
 164       functions->DrawPixels = intelDrawPixels;
 165    }
 166    functions->ReadPixels = intelReadPixels;
 167 }
 168