1 /*
2  * Copyright 2006 VMware, Inc.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the
7  * "Software"), to deal in the Software without restriction, including
8  * without limitation the rights to use, copy, modify, merge, publish,
9  * distribute, sublicense, and/or sell copies of the Software, and to
10  * permit persons to whom the Software is furnished to do so, subject to
11  * the following conditions:
12  *
13  * The above copyright notice and this permission notice (including the
14  * next paragraph) shall be included in all copies or substantial portionsalloc
15  * of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25 
26 #include "main/accum.h"
27 #include "main/enums.h"
28 #include "main/state.h"
29 #include "main/bufferobj.h"
30 #include "main/context.h"
31 #include "swrast/swrast.h"
32 
33 #include "brw_context.h"
34 #include "intel_pixel.h"
35 
36 #define FILE_DEBUG_FLAG DEBUG_PIXEL
37 
38 static GLenum
39 effective_func(GLenum func, bool 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 bool
56 intel_check_blit_fragment_ops(struct gl_context * ctx, bool 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 false;
64    }
65 
66    if (ctx->Color.BlendEnabled &&
67        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
68 	effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
69 	ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
70 	effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
71 	effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
72 	ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
73       DBG("fallback due to blend\n");
74       return false;
75    }
76 
77    if (ctx->Texture._MaxEnabledTexImageUnit != -1) {
78       DBG("fallback due to texturing\n");
79       return false;
80    }
81 
82    if (!(ctx->Color.ColorMask[0][0] &&
83 	 ctx->Color.ColorMask[0][1] &&
84 	 ctx->Color.ColorMask[0][2] &&
85 	 ctx->Color.ColorMask[0][3])) {
86       DBG("fallback due to color masking\n");
87       return false;
88    }
89 
90    if (ctx->Color.AlphaEnabled) {
91       DBG("fallback due to alpha\n");
92       return false;
93    }
94 
95    if (ctx->Depth.Test) {
96       DBG("fallback due to depth test\n");
97       return false;
98    }
99 
100    if (ctx->Fog.Enabled) {
101       DBG("fallback due to fog\n");
102       return false;
103    }
104 
105    if (ctx->_ImageTransferState) {
106       DBG("fallback due to image transfer\n");
107       return false;
108    }
109 
110    if (ctx->Stencil._Enabled) {
111       DBG("fallback due to image stencil\n");
112       return false;
113    }
114 
115    if (ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F) {
116       DBG("fallback due to pixel zoom\n");
117       return false;
118    }
119 
120    if (ctx->RenderMode != GL_RENDER) {
121       DBG("fallback due to render mode\n");
122       return false;
123    }
124 
125    return true;
126 }
127 
128 void
129 intelInitPixelFuncs(struct dd_function_table *functions)
130 {
131    functions->Bitmap = intelBitmap;
132    functions->CopyPixels = intelCopyPixels;
133    functions->DrawPixels = intelDrawPixels;
134    functions->ReadPixels = intelReadPixels;
135 }
136 
137