src/mesa/drivers/dri/i915/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 "enums.h"
  29 #include "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
  37 /**
  38  * Check if any fragment operations are in effect which might effect
  39  * glDraw/CopyPixels.
  40  */
  41 GLboolean
  42 intel_check_blit_fragment_ops(GLcontext * ctx)
  43 {
  44    if (ctx->NewState)
  45       _mesa_update_state(ctx);
  46
  47    /* XXX Note: Scissor could be done with the blitter:
  48     */
  49    return !(ctx->_ImageTransferState ||
  50             ctx->Color.AlphaEnabled ||
  51             ctx->Depth.Test ||
  52             ctx->Fog.Enabled ||
  53             ctx->Scissor.Enabled ||
  54             ctx->Stencil.Enabled ||
  55             !ctx->Color.ColorMask[0] ||
  56             !ctx->Color.ColorMask[1] ||
  57             !ctx->Color.ColorMask[2] ||
  58             !ctx->Color.ColorMask[3] ||
  59             ctx->Texture._EnabledUnits ||
  60             ctx->FragmentProgram._Enabled ||
  61             ctx->Color.BlendEnabled);
  62 }
  63
  64
  65 GLboolean
  66 intel_check_meta_tex_fragment_ops(GLcontext * ctx)
  67 {
  68    if (ctx->NewState)
  69       _mesa_update_state(ctx);
  70
  71    /* Some of _ImageTransferState (scale, bias) could be done with
  72     * fragment programs on i915.
  73     */
  74    return !(ctx->_ImageTransferState || ctx->Fog.Enabled ||     /* not done yet */
  75             ctx->Texture._EnabledUnits || ctx->FragmentProgram._Enabled);
  76 }
  77
  78 /* The intel_region struct doesn't really do enough to capture the
  79  * format of the pixels in the region.  For now this code assumes that
  80  * the region is a display surface and hence is either ARGB8888 or
  81  * RGB565.
  82  * XXX FBO: If we'd pass in the intel_renderbuffer instead of region, we'd
  83  * know the buffer's pixel format.
  84  *
  85  * \param format  as given to glDraw/ReadPixels
  86  * \param type  as given to glDraw/ReadPixels
  87  */
  88 GLboolean
  89 intel_check_blit_format(struct intel_region * region,
  90                         GLenum format, GLenum type)
  91 {
  92    if (region->cpp == 4 &&
  93        (type == GL_UNSIGNED_INT_8_8_8_8_REV ||
  94         type == GL_UNSIGNED_BYTE) && format == GL_BGRA) {
  95       return GL_TRUE;
  96    }
  97
  98    if (region->cpp == 2 &&
  99        type == GL_UNSIGNED_SHORT_5_6_5_REV && format == GL_BGR) {
 100       return GL_TRUE;
 101    }
 102
 103    if (INTEL_DEBUG & DEBUG_PIXEL)
 104       fprintf(stderr, "%s: bad format for blit (cpp %d, type %s format %s)\n",
 105               __FUNCTION__, region->cpp,
 106               _mesa_lookup_enum_by_nr(type), _mesa_lookup_enum_by_nr(format));
 107
 108    return GL_FALSE;
 109 }
 110
 111
 112 void
 113 intelInitPixelFuncs(struct dd_function_table *functions)
 114 {
 115    functions->Accum = _swrast_Accum;
 116    functions->Bitmap = _swrast_Bitmap;
 117    functions->CopyPixels = intelCopyPixels;
 118    functions->ReadPixels = intelReadPixels;
 119    functions->DrawPixels = intelDrawPixels;
 120 }