Attachment 18217 Details for Bug 17077 – This test-case exhibits the described bug

This test-case exhibits the described bug

break-mipmapping.c (text/x-csrc), 3.00 KB, created by Chris Lord on 2008-08-11 08:05:24 UTC

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Description:

Filename:

MIME Type:

Creator: Chris Lord

Created: 2008-08-11 08:05:24 UTC

Size: 3.00 KB

patch

obsolete

>
>/* gcc -Wall -g -o break-mipmapping break-mipmapping.c -lGL -lglut */
>
>#include <stdlib.h>
>#include <string.h>
>#include <GL/gl.h>
>#include <GL/glut.h>
>
>GLuint texture;
>
>static const unsigned char red[] = { 0xff, 0x00, 0x00, 0xff };
>static const unsigned char blue[] = { 0x00, 0x00, 0xff, 0xff };
>
>static void display_cb ()
>{
>  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>  glLoadIdentity();
>
>  glBindTexture (GL_TEXTURE_2D, texture);
>  glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
>
>  glBegin (GL_QUADS);
>  
>  glTexCoord2f (0.0, 0.0);
>  glVertex3f   (-9.0,  -9.0, -10.f);
>  
>  glTexCoord2f (1.0, 0.0);
>  glVertex3f   (9.0,  -9.0, -10.f);
>  
>  glTexCoord2f (1.0, 1.0);
>  glVertex3f   (9.0,  9.0, -10.f);
>  
>  glTexCoord2f (0.0, 1.0);
>  glVertex3f   (-9.0,  9.0, -10.f);
>  
>  glEnd ();
>
>  glFlush ();
>  glutSwapBuffers ();
>}
>
>static void reshape_cb (int w, int h)
>{
>  glViewport     (0, 0, w, h);
>  glMatrixMode   (GL_PROJECTION);
>  glLoadIdentity ();
>  gluPerspective (90.f, 1.0, 1, 120);
>  
>  glMatrixMode (GL_MODELVIEW);
>  glLoadIdentity ();
>}
>
>static void keyboard_cb (unsigned char key, int x, int y)
>{
>  switch (key) {
>    case 27:
>    case 'Q':
>    case 'q':
>      exit (0);
>      break;
>    case ' ':
>      {
>        int i;
>        unsigned char *data;
>        
>        data = malloc (256 * 256 * 4);
>        for (i = 0; i < 4 * 256 * 256; i+=4)
>          memmove (&data[i], &red, 4);
>        
>        glBindTexture (GL_TEXTURE_2D, texture);
>        
>        glTexSubImage2D (GL_TEXTURE_2D, 0, 128, 128, 256, 256,
>                         GL_RGBA, GL_UNSIGNED_BYTE, data);
>        
>        free (data);
>      }
>      break;
>  }
>}
>
>int main (int argc, char** argv)
>{
>  int i;
>  unsigned char *data;
>  
>  glutInit (&argc, argv);
>  glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
>  glutInitWindowSize (512, 512);
>  glutCreateWindow ("Mip-mapped texture breaking test");
>
>  glEnable (GL_TEXTURE_2D);
>  glEnable (GL_SMOOTH);
>  glEnable (GL_BLEND);
>  glEnable (GL_DEPTH_TEST);
>  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
>  glClearColor (.0f, .0f, .0f, 0.0f);
>  glClearDepth (1.0f);
>  
>  glutDisplayFunc (display_cb);
>  glutIdleFunc (display_cb);
>  glutReshapeFunc (reshape_cb);
>  glutKeyboardFunc (keyboard_cb);
>  
>  glGenTextures (1, &texture);
>  glBindTexture (GL_TEXTURE_2D, texture);
>  
>  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
>  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
>  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
>  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
>
>#ifndef NO_MIPMAP
>  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
>                   GL_LINEAR_MIPMAP_LINEAR);
>  glTexParameteri (GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
>#endif
>
>  data = malloc (512 * 512 * 4);
>  for (i = 0; i < 4 * 512 * 512; i += 4)
>    memmove (&data[i], &blue, 4);
>  
>  glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 512, 512, 0,
>                GL_RGBA, GL_UNSIGNED_BYTE, data);
>  
>  free (data);
>  
>  glutMainLoop ();
>  
>  return 0;
>}
>

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