Attachment 17661 Details for Bug 16371 – test case

test case

copyteximage.c (text/x-c), 2.56 KB, created by Shuang He on 2008-07-13 23:37:52 UTC

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Creator: Shuang He

Created: 2008-07-13 23:37:52 UTC

Size: 2.56 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>#define TEXSIZE 16
>
>
>void
>init (void)
>{
>    int i;
>    GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };
>
>    glClearColor (0.0, 0.0, 0.0, 1.0);
>    glColor4fv (white);
>    glDisable (GL_DITHER);
>}
>
>
>static void
>test (void)
>{
>    int i, j;
>    int texName;
>    GLfloat readback[TEXSIZE][TEXSIZE][4];
>
>    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>    glGenTextures (1, &texName);
>    glBindTexture (GL_TEXTURE_2D, texName);
>    glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, TEXSIZE, TEXSIZE, 0, GL_RGBA, GL_FLOAT, NULL);
>    glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
>    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
>                     GL_CLAMP_TO_BORDER_ARB);
>    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
>                     GL_CLAMP_TO_BORDER_ARB);
>
>
>    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>    glDisable (GL_TEXTURE_2D);
>    glColor3f (0.0, 0.0, 1.0);
>
>    glBegin (GL_POLYGON);
>    glVertex2f (0, 0);
>    glVertex2f (TEXSIZE, 0);
>    glVertex2f (TEXSIZE, TEXSIZE);
>    glVertex2f (0, TEXSIZE);
>    glEnd ();
>
>
>    glCopyTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, TEXSIZE, TEXSIZE, 0);
>
>    glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, readback);
>    for (i=0; i<TEXSIZE; i++)
>	for (j=0; j<TEXSIZE; j++) {
>		printf("(%f, %f, %f, %f)\n", readback[i][j][0], readback[i][j][1], readback[i][j][2], readback[i][j][3]);
>	}
>    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>    glColor3f (1.0, 0.0, 0.0);
>    glEnable(GL_TEXTURE_2D);
>    glBegin (GL_POLYGON);
>	glTexCoord2f(0, 0);
>    	glVertex2f (30, 0);
>	glTexCoord2f(1, 0);
>    	glVertex2f (30+TEXSIZE, 0);
>	glTexCoord2f(1, 1);
>    	glVertex2f (30+TEXSIZE, TEXSIZE);
>	glTexCoord2f(0, 1);
> 	glVertex2f (30, TEXSIZE);
>    glEnd ();
>
>
>    glFlush ();
>}
>
>void
>display (void)
>{
>    glMatrixMode (GL_PROJECTION);
>    glLoadIdentity ();
>    glOrtho (0, 63, 0, 63, 0, 1.0);
>    glViewport (0, 0, 63, 63);
>    test ();
>}
>
>
>main (int argc, char **argv)
>{
>    glutInit (&argc, argv);
>    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGBA | GLUT_DEPTH);
>    glutInitWindowSize (WINDSIZEX, WINDSIZEY);
>    glutInitWindowPosition (100, 100);
>    glutCreateWindow (argv[0]);
>    init ();
>    glutDisplayFunc (display);
>    glutMainLoop ();
>    return 0;
>}

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Attachments on bug 16371: 17136 | 17137 | 17138 | 17661

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