Attachment 57667 Details for Bug 46631 – Test case showing reading luminance values

Test case showing reading luminance values

test-luminance.c (text/x-c), 1.27 KB, created by Neil Roberts on 2012-02-26 09:19:43 UTC

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Filename:

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Creator: Neil Roberts

Created: 2012-02-26 09:19:43 UTC

Size: 1.27 KB

patch

obsolete

>#include <GL/glew.h>
>#include <GL/freeglut.h>
>#include <GL/gl.h>
>#include <stdio.h>
>#include <string.h>
>
>static void
>display_cb (void)
>{
>  GLuint tex, fb;
>  GLubyte tex_value = 1;
>
>  glGenTextures (1, &tex);
>  glBindTexture (GL_TEXTURE_2D, tex);
>  glTexImage2D (GL_TEXTURE_2D, 0, GL_LUMINANCE, 1, 1, 0, GL_LUMINANCE,
>                GL_UNSIGNED_BYTE, &tex_value);
>  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>
>  glGenFramebuffers (1, &fb);
>  glBindFramebuffer (GL_FRAMEBUFFER, fb);
>  glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
>                          GL_TEXTURE_2D, tex, 0);
>  if (glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
>    {
>      printf ("framebuffer is incomplete :(\n");
>      return;
>    }
>
>  glReadPixels (0, 0,
>                1, 1,
>                GL_LUMINANCE,
>                GL_UNSIGNED_BYTE,
>                &tex_value);
>  printf ("tex_value = %i\n", tex_value);
>
>  glDeleteFramebuffers (1, &fb);
>  glDeleteTextures (1, &tex);
>
>  glutSwapBuffers ();
>}
>
>int
>main (int argc, char **argv)
>{
>  glutInit (&argc, argv);
>  glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE);
>  glutInitWindowSize (512, 512);
>  glutCreateWindow ("Luminance test");
>  glutDisplayFunc (display_cb);
>  glewInit ();
>
>  glutMainLoop ();
>
>  return 0;
>}

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Attachments on bug 46631: 57646 | 57665 | 57666 | 57667

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