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press 'c' to toggle Z clear value between 0/1

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This commit is contained in:
Brian Paul 2008-09-05 13:07:43 -06:00
parent 8df4c3a21f
commit 83054d9297
1 changed files with 21 additions and 4 deletions
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25
progs/trivial/tri-z.c
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@ -56,6 +56,15 @@ static struct { GLenum func; const char *str; } funcs[] =
#define NUM_FUNCS (sizeof(funcs) / sizeof(funcs[0]))
static int curFunc = 0;
static double clearVal = 1.0;
static void usage(void)
{
printf("t - toggle rendering order of triangles\n");
printf("c - toggle Z clear value between 0, 1\n");
printf("f - cycle through depth test functions\n");
}
static void init(void)
@ -88,11 +97,13 @@ static void drawRightTriangle(void)
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
printf("GL_DEPTH_FUNC = %s\n", funcs[curFunc].str);
printf("GL_CLEAR_DEPTH = %f GL_DEPTH_FUNC = %s\n",
clearVal, funcs[curFunc].str);
glClearDepth(clearVal);
glDepthFunc(funcs[curFunc].func);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
@ -120,6 +131,11 @@ void reshape(int w, int h)
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'c':
case 'C':
clearVal = 1.0 - clearVal;
glutPostRedisplay();
break;
case 'f':
case 'F':
curFunc = (curFunc + 1) % NUM_FUNCS;
@ -148,10 +164,11 @@ int main(int argc, char** argv)
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize (200, 200);
glutCreateWindow (argv[0]);
init();
glutReshapeFunc (reshape);
glutKeyboardFunc (keyboard);
glutDisplayFunc (display);
init();
usage();
glutMainLoop();
return 0;
}