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