src/mesa/state_tracker/st_copytex.c

   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
  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 }