Attachment 113562 Details for Bug 89148 – Test program

Test program

fbo.c (text/plain), 3.21 KB, created by Stefan Dösinger on 2015-02-17 11:43:12 UTC

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Creator: Stefan Dösinger

Created: 2015-02-17 11:43:12 UTC

Size: 3.21 KB

patch

obsolete

>#define GL_GLEXT_PROTOTYPES
>#include <GL/gl.h>
>#include <GL/glext.h>
>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <string.h>
>
>#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, fbo_dst, rb, fbo_src;
>    GLenum status;
>    unsigned int mem[TEX_W][TEX_H];
>
>    /* 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_SRGB8_ALPHA8, TEX_W, TEX_H, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, mem);
>    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SRGB_DECODE_EXT, GL_SKIP_DECODE_EXT);
>    glBindTexture(GL_TEXTURE_2D, 0);
>    CHECK_GLERROR();
>
>    /* Source renderbuffer */
>    glGenRenderbuffers(1, &rb);
>    glBindRenderbuffer(GL_RENDERBUFFER, rb);
>    glRenderbufferStorageMultisample(GL_RENDERBUFFER, 2, GL_RGBA8, TEX_W, TEX_H);
>    CHECK_GLERROR();
>
>    glGenFramebuffers(1, &fbo_src);
>    glBindFramebuffer(GL_FRAMEBUFFER, fbo_src);
>    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rb);
>    status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
>    if (status != GL_FRAMEBUFFER_COMPLETE) fprintf(stderr, "FBO status %#x\n", status);
>    CHECK_GLERROR();
>
>    glDrawBuffer(GL_COLOR_ATTACHMENT0);
>    glViewport(0, 0, TEX_W, TEX_H);
>    glClearColor(0.0, 1.0, 0.5, 0);
>    glClear(GL_COLOR_BUFFER_BIT);
>    CHECK_GLERROR();
>
>    /* Prepare a fbo with the texture as color attachment */
>    glGenFramebuffers(1, &fbo_dst);
>    glBindFramebuffer(GL_FRAMEBUFFER, fbo_dst);
>    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0);
>    status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
>    if (status != GL_FRAMEBUFFER_COMPLETE) fprintf(stderr, "FBO status %#x\n", status);
>    CHECK_GLERROR();
>
>    glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo_src);
>    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo_dst);
>    printf("Going to blit\n");
>    glBlitFramebuffer(0, 0, TEX_W, TEX_H, 0, 0, TEX_W, TEX_H, GL_COLOR_BUFFER_BIT, GL_NEAREST);
>    printf("Blit done\n");
>    CHECK_GLERROR();
>
>    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
>    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
>    CHECK_GLERROR();
>
>    glBindTexture(GL_TEXTURE_2D, tex);
>    glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, mem);
>    printf("read result: %08x\n", mem[16][16]);
>}
>
>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 89148: 113562 | 113620 | 113719 | 113802

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