[Dri-devel] tdfx, HP_occlusion_test

[Fray Bentos]

Hi I submitted a bug report a few days ago concerning the HP_OCCLUSION_TEST
extention to opengl on the tdfx driver.

Im hopefully gonna fix it myself, but i was wondering if any one can verify that
the extension works perfectly on any other (other than the v5500) voodoo card.

The bug report ID is 469331, there is a simple glut program to test it.
I have attach the prog to this email too. If you cant see the white square or
it flickers/blinks the extension is failing (well the glide register read
anyhow)

Any feedback wil be greatly appreciated.

Thanks.
-- 
                        - | TheBentos | -

The Moon is Waning Crescent (34% of full)

#include <GL/gl.h>
#include <GL/glut.h>

#define NULL    (void*)0

GLfloat rot = 0.0f;

void draw(void)
{
    glBegin(GL_QUADS);
        glVertex3f(-1.0f, 1.0f, 0.0f);
        glVertex3f(1.0f, 1.0f, 0.0f);
        glVertex3f(1.0f, -1.0f, 0.0f);
        glVertex3f(-1.0f, -1.0f, 0.0f);
    glEnd();
}
void display(void)
{
    GLboolean result = GL_TRUE;
    
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();
    glTranslatef(0.0f, 0.0f, -2.0f);
    glRotatef(rot, 0.0f, 1.0f, 0.0f);
    glColor3f(1.0f, 0.0f, 1.0f);
    draw();
    
    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
    glDepthMask(GL_FALSE);
    
    glEnable(GL_OCCLUSION_TEST_HP);
        glLoadIdentity();
        glTranslatef(0.0f, 0.0f, -4.0f);
        glColor3f(1.0f, 1.0f, 1.0f);
        draw();
        glGetBooleanv(GL_OCCLUSION_TEST_RESULT_HP, &result);
    glDisable(GL_OCCLUSION_TEST_HP);
    
    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
    glDepthMask(GL_TRUE);
    
    printf("%d\n", result);
    if (result == GL_TRUE)
    {
        draw();
    }
    
    rot += 0.5f;
    glutSwapBuffers();
}

void visible(int state)
{
    glutIdleFunc((state == GLUT_VISIBLE ? glutPostRedisplay : NULL));
}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutCreateWindow("HP_occlusion_test");
    glutDisplayFunc(display);
    glutVisibilityFunc(visible);
    
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClearDepth(1.0f);
    glMatrixMode(GL_PROJECTION);
    gluPerspective(90.0,1.0, 1.0, 10.0);
    glMatrixMode(GL_MODELVIEW);
    gluLookAt(0.0, 0.0, 5.0,
              0.0, 0.0, 0.0,
              0.0, 1.0, 0.);
    
    glutMainLoop();
    return 0;
}