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