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 "swrast/swrast.h"
  31
  32 #include "intel_context.h"
  33 #include "intel_pixel.h"
  34 #include "intel_regions.h"
  35
  36 #define FILE_DEBUG_FLAG DEBUG_PIXEL
  37
  38 static GLenum
  39 effective_func(GLenum func, GLboolean 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 GLboolean
  56 intel_check_blit_fragment_ops(GLcontext * ctx, GLboolean 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 GL_FALSE;
  64    }
  65
  66    if (ctx->Color.BlendEnabled &&
  67        (effective_func(ctx->Color.BlendSrcRGB, src_alpha_is_one) != GL_ONE ||
  68         effective_func(ctx->Color.BlendDstRGB, src_alpha_is_one) != GL_ZERO ||
  69         ctx->Color.BlendEquationRGB != GL_FUNC_ADD ||
  70         effective_func(ctx->Color.BlendSrcA, src_alpha_is_one) != GL_ONE ||
  71         effective_func(ctx->Color.BlendDstA, src_alpha_is_one) != GL_ZERO ||
  72         ctx->Color.BlendEquationA != GL_FUNC_ADD)) {
  73       DBG("fallback due to blend\n");
  74       return GL_FALSE;
  75    }
  76
  77    if (ctx->Texture._EnabledUnits) {
  78       DBG("fallback due to texturing\n");
  79       return GL_FALSE;
  80    }
  81
  82    if (!(ctx->Color.ColorMask[0] &&
  83          ctx->Color.ColorMask[1] &&
  84          ctx->Color.ColorMask[2] &&
  85          ctx->Color.ColorMask[3])) {
  86       DBG("fallback due to color masking\n");
  87       return GL_FALSE;
  88    }
  89
  90    if (ctx->Color.AlphaEnabled) {
  91       DBG("fallback due to alpha\n");
  92       return GL_FALSE;
  93    }
  94
  95    if (ctx->Depth.Test) {
  96       DBG("fallback due to depth test\n");
  97       return GL_FALSE;
  98    }
  99
 100    if (ctx->Fog.Enabled) {
 101       DBG("fallback due to fog\n");
 102       return GL_FALSE;
 103    }
 104
 105    if (ctx->_ImageTransferState) {
 106       DBG("fallback due to image transfer\n");
 107       return GL_FALSE;
 108    }
 109
 110    if (ctx->Stencil.Enabled) {
 111       DBG("fallback due to image stencil\n");
 112       return GL_FALSE;
 113    }
 114
 115    if (ctx->RenderMode != GL_RENDER) {
 116       DBG("fallback due to render mode\n");
 117       return GL_FALSE;
 118    }
 119
 120    return GL_TRUE;
 121 }
 122
 123
 124 GLboolean
 125 intel_check_meta_tex_fragment_ops(GLcontext * ctx)
 126 {
 127    if (ctx->NewState)
 128       _mesa_update_state(ctx);
 129
 130    /* Some of _ImageTransferState (scale, bias) could be done with
 131     * fragment programs on i915.
 132     */
 133    return !(ctx->_ImageTransferState || ctx->Fog.Enabled ||     /* not done yet */
 134             ctx->Texture._EnabledUnits || ctx->FragmentProgram._Enabled);
 135 }
 136
 137 /* The intel_region struct doesn't really do enough to capture the
 138  * format of the pixels in the region.  For now this code assumes that
 139  * the region is a display surface and hence is either ARGB8888 or
 140  * RGB565.
 141  * XXX FBO: If we'd pass in the intel_renderbuffer instead of region, we'd
 142  * know the buffer's pixel format.
 143  *
 144  * \param format  as given to glDraw/ReadPixels
 145  * \param type  as given to glDraw/ReadPixels
 146  */
 147 GLboolean
 148 intel_check_blit_format(struct intel_region * region,
 149                         GLenum format, GLenum type)
 150 {
 151    if (region->cpp == 4 &&
 152        (type == GL_UNSIGNED_INT_8_8_8_8_REV ||
 153         type == GL_UNSIGNED_BYTE) && format == GL_BGRA) {
 154       return GL_TRUE;
 155    }
 156
 157    if (region->cpp == 2 &&
 158        type == GL_UNSIGNED_SHORT_5_6_5_REV && format == GL_BGR) {
 159       return GL_TRUE;
 160    }
 161
 162    if (INTEL_DEBUG & DEBUG_PIXEL)
 163       fprintf(stderr, "%s: bad format for blit (cpp %d, type %s format %s)\n",
 164               __FUNCTION__, region->cpp,
 165               _mesa_lookup_enum_by_nr(type), _mesa_lookup_enum_by_nr(format));
 166
 167    return GL_FALSE;
 168 }
 169
 170
 171 void
 172 intelInitPixelFuncs(struct dd_function_table *functions)
 173 {
 174    functions->Accum = _swrast_Accum;
 175    if (!getenv("INTEL_NO_BLIT")) {
 176       functions->Bitmap = intelBitmap;
 177       functions->CopyPixels = intelCopyPixels;
 178       functions->DrawPixels = intelDrawPixels;
 179 #ifdef I915
 180       functions->ReadPixels = intelReadPixels;
 181 #endif
 182    }
 183 }