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1 /*
2  * Copyright 2015 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 "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included
13  * in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21  * OTHER DEALINGS IN THE SOFTWARE.
22  */
23 
24 #include "main/mtypes.h"
25 #include "main/buffers.h"
26 #include "main/errors.h"
27 #include "main/fbobject.h"
28 #include "main/get.h"
29 #include "main/teximage.h"
30 #include "main/texparam.h"
31 #include "st_copytex.h"
32 
33 
34 /**
35  * Copy a colorbuffer from the window system framebuffer (a window or
36  * pbuffer) to a texture.
37  * This is a helper used by the wglBindTexImageARB() function.
38  *
39  * \param srcBuffer  source buffer (GL_FRONT_LEFT, GL_BACK_LEFT, etc)
40  * \param fbWidth  width of the source framebuffer
41  * \param fbHeight  height of the source framebuffer
42  * \param texTarget  which texture target to copy to (GL_TEXTURE_1D/2D/CUBE_MAP)
43  * \param texLevel  which texture mipmap level to copy to
44  * \param cubeFace  which cube face to copy to (in [0,5])
45  * \param texFormat  what texture format to use, if texture doesn't exist
46  */
47 void
st_copy_framebuffer_to_texture(GLenum srcBuffer,GLint fbWidth,GLint fbHeight,GLenum texTarget,GLint texLevel,GLuint cubeFace,GLenum texFormat)48 st_copy_framebuffer_to_texture(GLenum srcBuffer,
49                                GLint fbWidth, GLint fbHeight,
50                                GLenum texTarget, GLint texLevel,
51                                GLuint cubeFace, GLenum texFormat)
52 {
53    GLint readFBOSave, readBufSave, width, height;
54 
55    assert(cubeFace < 6);
56 
57    /* Save current FBO / readbuffer */
58    _mesa_GetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &readFBOSave);
59    _mesa_GetIntegerv(GL_READ_BUFFER, &readBufSave);
60 
61    /* Read from the winsys buffer */
62    _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
63    _mesa_ReadBuffer(srcBuffer);
64 
65    /* copy image from pbuffer to texture */
66    switch (texTarget) {
67    case GL_TEXTURE_1D:
68       _mesa_GetTexLevelParameteriv(GL_TEXTURE_1D, texLevel,
69                                    GL_TEXTURE_WIDTH, &width);
70       if (width == fbWidth) {
71          /* replace existing texture */
72          _mesa_CopyTexSubImage1D(GL_TEXTURE_1D,
73                                  texLevel,
74                                  0,    /* xoffset */
75                                  0, 0, /* x, y */
76                                  fbWidth);
77       } else {
78          /* define initial texture */
79          _mesa_CopyTexImage1D(GL_TEXTURE_1D,
80                               texLevel,
81                               texFormat,
82                               0, 0, /* x, y */
83                               fbWidth, 0);
84       }
85       break;
86    case GL_TEXTURE_2D:
87       _mesa_GetTexLevelParameteriv(GL_TEXTURE_2D, texLevel,
88                                    GL_TEXTURE_WIDTH, &width);
89       _mesa_GetTexLevelParameteriv(GL_TEXTURE_2D, texLevel,
90                                    GL_TEXTURE_HEIGHT, &height);
91       if (width == fbWidth && height == fbHeight) {
92          /* replace existing texture */
93          _mesa_CopyTexSubImage2D(GL_TEXTURE_2D,
94                                  texLevel,
95                                  0, 0, /* xoffset, yoffset */
96                                  0, 0, /* x, y */
97                                  fbWidth, fbHeight);
98       } else {
99          /* define initial texture */
100          _mesa_CopyTexImage2D(GL_TEXTURE_2D,
101                               texLevel,
102                               texFormat,
103                               0, 0, /* x, y */
104                               fbWidth, fbHeight, 0);
105       }
106       break;
107    case GL_TEXTURE_CUBE_MAP:
108       {
109          const GLenum target =
110             GL_TEXTURE_CUBE_MAP_POSITIVE_X + cubeFace;
111          _mesa_GetTexLevelParameteriv(target, texLevel,
112                                       GL_TEXTURE_WIDTH, &width);
113          _mesa_GetTexLevelParameteriv(target, texLevel,
114                                       GL_TEXTURE_HEIGHT, &height);
115          if (width == fbWidth && height == fbHeight) {
116             /* replace existing texture */
117             _mesa_CopyTexSubImage2D(target,
118                                     texLevel,
119                                     0, 0, /* xoffset, yoffset */
120                                     0, 0, /* x, y */
121                                     fbWidth, fbHeight);
122          } else {
123             /* define new texture */
124             _mesa_CopyTexImage2D(target,
125                                  texLevel,
126                                  texFormat,
127                                  0, 0, /* x, y */
128                                  fbWidth, fbHeight, 0);
129          }
130       }
131       break;
132    default:
133       _mesa_problem(NULL,
134                     "unexpected target in st_copy_framebuffer_to_texture()\n");
135    }
136 
137    /* restore readbuffer */
138    _mesa_ReadBuffer(readBufSave);
139    _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, readFBOSave);
140 }
141