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#include "api_exec_decl.h"
33
34
35/**
36 * Copy a colorbuffer from the window system framebuffer (a window or
37 * pbuffer) to a texture.
38 * This is a helper used by the wglBindTexImageARB() function.
39 *
40 * \param srcBuffer  source buffer (GL_FRONT_LEFT, GL_BACK_LEFT, etc)
41 * \param fbWidth  width of the source framebuffer
42 * \param fbHeight  height of the source framebuffer
43 * \param texTarget  which texture target to copy to (GL_TEXTURE_1D/2D/CUBE_MAP)
44 * \param texLevel  which texture mipmap level to copy to
45 * \param cubeFace  which cube face to copy to (in [0,5])
46 * \param texFormat  what texture format to use, if texture doesn't exist
47 */
48void
49st_copy_framebuffer_to_texture(GLenum srcBuffer,
50                               GLint fbWidth, GLint fbHeight,
51                               GLenum texTarget, GLint texLevel,
52                               GLuint cubeFace, GLenum texFormat)
53{
54   GLint readFBOSave, readBufSave, width, height;
55
56   assert(cubeFace < 6);
57
58   /* Save current FBO / readbuffer */
59   _mesa_GetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &readFBOSave);
60   _mesa_GetIntegerv(GL_READ_BUFFER, &readBufSave);
61
62   /* Read from the winsys buffer */
63   _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, 0);
64   _mesa_ReadBuffer(srcBuffer);
65
66   /* copy image from pbuffer to texture */
67   switch (texTarget) {
68   case GL_TEXTURE_1D:
69      _mesa_GetTexLevelParameteriv(GL_TEXTURE_1D, texLevel,
70                                   GL_TEXTURE_WIDTH, &width);
71      if (width == fbWidth) {
72         /* replace existing texture */
73         _mesa_CopyTexSubImage1D(GL_TEXTURE_1D,
74                                 texLevel,
75                                 0,    /* xoffset */
76                                 0, 0, /* x, y */
77                                 fbWidth);
78      } else {
79         /* define initial texture */
80         _mesa_CopyTexImage1D(GL_TEXTURE_1D,
81                              texLevel,
82                              texFormat,
83                              0, 0, /* x, y */
84                              fbWidth, 0);
85      }
86      break;
87   case GL_TEXTURE_2D:
88      _mesa_GetTexLevelParameteriv(GL_TEXTURE_2D, texLevel,
89                                   GL_TEXTURE_WIDTH, &width);
90      _mesa_GetTexLevelParameteriv(GL_TEXTURE_2D, texLevel,
91                                   GL_TEXTURE_HEIGHT, &height);
92      if (width == fbWidth && height == fbHeight) {
93         /* replace existing texture */
94         _mesa_CopyTexSubImage2D(GL_TEXTURE_2D,
95                                 texLevel,
96                                 0, 0, /* xoffset, yoffset */
97                                 0, 0, /* x, y */
98                                 fbWidth, fbHeight);
99      } else {
100         /* define initial texture */
101         _mesa_CopyTexImage2D(GL_TEXTURE_2D,
102                              texLevel,
103                              texFormat,
104                              0, 0, /* x, y */
105                              fbWidth, fbHeight, 0);
106      }
107      break;
108   case GL_TEXTURE_CUBE_MAP:
109      {
110         const GLenum target =
111            GL_TEXTURE_CUBE_MAP_POSITIVE_X + cubeFace;
112         _mesa_GetTexLevelParameteriv(target, texLevel,
113                                      GL_TEXTURE_WIDTH, &width);
114         _mesa_GetTexLevelParameteriv(target, texLevel,
115                                      GL_TEXTURE_HEIGHT, &height);
116         if (width == fbWidth && height == fbHeight) {
117            /* replace existing texture */
118            _mesa_CopyTexSubImage2D(target,
119                                    texLevel,
120                                    0, 0, /* xoffset, yoffset */
121                                    0, 0, /* x, y */
122                                    fbWidth, fbHeight);
123         } else {
124            /* define new texture */
125            _mesa_CopyTexImage2D(target,
126                                 texLevel,
127                                 texFormat,
128                                 0, 0, /* x, y */
129                                 fbWidth, fbHeight, 0);
130         }
131      }
132      break;
133   default:
134      _mesa_problem(NULL,
135                    "unexpected target in st_copy_framebuffer_to_texture()\n");
136   }
137
138   /* restore readbuffer */
139   _mesa_ReadBuffer(readBufSave);
140   _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, readFBOSave);
141}
142