Attachment 50814 Details for Bug 40554 – Sample application

Sample application

fbo.c (text/x-csrc), 2.32 KB, created by Stefan Dösinger on 2011-09-01 08:20:02 UTC

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Description:

Filename:

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Creator: Stefan Dösinger

Created: 2011-09-01 08:20:02 UTC

Size: 2.32 KB

patch

obsolete

>
>#define  GLUT_RGB                           0x0000
>#define  GLUT_DOUBLE                        0x0002
>#define  GLUT_ACCUM							0x0004
>#define  GLUT_DEPTH                         0x0010
>
>
>#ifdef __APPLE__
>#include <OpenGL/gl.h>
>#else
>#include <GL/gl.h>
>#endif
>#include <stdlib.h>
>#include <stdio.h>
>#include <string.h>
>    GLuint prog;
>    GLuint loc;
>
>#define TEX_W 256
>#define TEX_H 256
>
>#define CHECK_GLERROR()                                     \
>{                                                           \
>    GLenum err = glGetError();                              \
>    while (err != GL_NO_ERROR)                              \
>    {                                                       \
>        fprintf(stderr, "GL Error %#x, %s, line %d\n",      \
>                err, __FILE__, __LINE__);                   \
>        err = glGetError();                                 \
>    }                                                       \
>}
>
>void init(void)
>{
>    GLuint tex, rb, fbo;
>    GLenum status;
>
>    glDrawBuffer(GL_BACK);
>    CHECK_GLERROR();
>    glReadBuffer(GL_BACK);
>    CHECK_GLERROR();
>
>    /* Generate a destination texture */
>    glGenTextures(1, &tex);
>    glBindTexture(GL_TEXTURE_2D, tex);
>    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, TEX_W, TEX_H, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL);
>    CHECK_GLERROR();
>
>    /* Prepare a fbo with the texture as color attachment */
>    glGenFramebuffersEXT(1, &fbo);
>    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
>    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, tex, 0);
>    glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
>    glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
>    CHECK_GLERROR();
>    status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
>    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) fprintf(stderr, "FBO status %#x\n", status);
>
>    glClearColor(1, 1, 1, 0);
>    printf("clear now\n");
>    glClear(GL_COLOR_BUFFER_BIT);
>    printf("clear done\n");
>    CHECK_GLERROR();
>}
>
>int main(int argc, char** argv)
>{
>   glutInit(&argc, argv);
>   
>   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_ACCUM);
>   glutInitWindowSize (200, 200);
>   glutCreateWindow (argv[0]);
>   init();
>   return 0;
>}

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Attachments on bug 40554: 50814

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