intel_pixel.c revision 9e68e191ac9d32f2f93e840a66127e724b442756 
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 */
41GLboolean
42intel_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
65GLboolean
66intel_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 */
88GLboolean
89intel_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
112void
113intelInitPixelFuncs(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}
121