Attachment 14547 Details for Bug 14656 – test case

test case

multtex.c (text/plain), 4.32 KB, created by Shuang He on 2008-02-24 21:49:28 UTC

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Creator: Shuang He

Created: 2008-02-24 21:49:28 UTC

Size: 4.32 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>
>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);
>    gluOrtho2D (0, WINDSIZEX, 0, WINDSIZEY);
>    glDisable (GL_DITHER);
>}
>
>void Maketexture(GLsizei size, GLfloat *buf, long texnum)
>{
>    GLint level, i, j, k;
>
>    for (i = 0; i < size; i++) {
>        for (j = 0; j < size; j++) {
>            k = (i * size + j) * 3;
>            buf[k+0] = (texnum == 0) ? 0.0 : 1.0;
>            buf[k+1] = (texnum == 0) ? 1.0 : 0.0;
>            buf[k+2] = 1.0;
>        }
>    }
>
>}
>
>static void
>test (void)
>{
>    int i, j;
>    GLfloat buf[WINDSIZEX * WINDSIZEY * 3];
>    GLuint numTextures, textureNames[2];
>    GLfloat *textureBuf[2];
>
>    glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &numTextures);
>    if (numTextures <= 1)
>	exit(0);
>
>    glClearColor (0.0, 0.0, 0.0, 0.0);
>    glColor3f (1.0, 1.0, 1.0);
>    glClear (GL_COLOR_BUFFER_BIT);
>
>    glGenTextures(2, textureNames);
>
>    for (i=0; i<2; i++)
>    {
>        glActiveTextureARB(GL_TEXTURE0_ARB+i);
>        glBindTexture(GL_TEXTURE_2D, textureNames[i]);
>        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>        textureBuf[i] = (GLfloat *)malloc(8*8*3*sizeof(GLfloat));
>        Maketexture(8, textureBuf[i], i);
>        glTexImage2D(GL_TEXTURE_2D, 0, 3, 8, 8, 0, GL_RGB,
>                     GL_FLOAT, textureBuf[i]);
>    }
>
>    // enable two texture unit separately with GL_DECAL mode
>    for (i=0; i<2; i++)
>    {
>        glActiveTextureARB(GL_TEXTURE0_ARB+i);
>        glEnable(GL_TEXTURE_2D);
>        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
>	glBegin(GL_POLYGON);
>        glMultiTexCoord2fARB(GL_TEXTURE0_ARB+i, 0.0, 0.0);
>        glVertex2i(0, 0);
>        glMultiTexCoord2fARB(GL_TEXTURE0_ARB+i, 0.0, 1.0);
>        glVertex2i(0, 8);
>        glMultiTexCoord2fARB(GL_TEXTURE0_ARB+i, 1.0, 1.0);
>        glVertex2i(8, 8);
>        glMultiTexCoord2fARB(GL_TEXTURE0_ARB+i, 1.0, 0.0);
>        glVertex2i(8, 0);
>        glEnd();
>//	glFlush();
>	glReadPixels (0, 0, WINDSIZEX, WINDSIZEY, GL_RGB, GL_FLOAT, buf);
>	glDisable(GL_TEXTURE_2D);
>    }
>
>    // enable two texture units together, with GL_MODULATE mode.
>    for (i = 0; i < 2; i++) {
>        glActiveTextureARB(GL_TEXTURE0_ARB+i);
>        glEnable(GL_TEXTURE_2D);
>        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
>    }
>
>    glBegin(GL_POLYGON);
>    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
>    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
>    glVertex2i(0, 0);
>    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 1.0);
>    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
>    glVertex2i(0, 8);
>    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0, 1.0);
>    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
>    glVertex2i(8, 8);
>    glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0, 0.0);
>    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
>    glVertex2i(8, 0);
>    glEnd();
>
>
>
>    glReadPixels (0, 0, WINDSIZEX, WINDSIZEY, GL_RGB, GL_FLOAT, buf);
>    for (j = 0; j < WINDSIZEY; j++)
>    {
>        for (i = 0; i < WINDSIZEY; i++)
>        {
>            if (buf[(j * WINDSIZEX + i) * 3] != 0
>                || buf[(j * WINDSIZEX + i) * 3 + 1] != 0
>                || buf[(j * WINDSIZEX + i) * 3 + 2] != 0)
>            {
>                printf ("(%d, %d) = [%f, %f, %f]\n", i, j,
>                        buf[(j * WINDSIZEX + i) * 3],
>                        buf[(j * WINDSIZEX + i) * 3 + 1],
>                        buf[(j * WINDSIZEX + i) * 3 + 2]);
>            }
>        }
>    }
>}
>
>void
>display (void)
>{
>    glViewport (0, 0, WINDSIZEX, WINDSIZEY);
>    glMatrixMode (GL_PROJECTION);
>    glLoadIdentity ();
>    gluOrtho2D (0, WINDSIZEX, 0, WINDSIZEY);
>    glMatrixMode (GL_MODELVIEW);
>    glLoadIdentity ();
>
>    test ();
>}
>
>int
>main (int argc, char **argv)
>{
>    glutInit (&argc, argv);
>    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGBA);
>    glutInitWindowSize (WINDSIZEX, WINDSIZEY);
>    glutInitWindowPosition (100, 100);
>    glutCreateWindow (argv[0]);
>    init ();
>    glutDisplayFunc (display);
>    glutMainLoop ();
>    return 0;
>}

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Attachments on bug 14656: 14547

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