diff options
Diffstat (limited to 'progs/trivial/tri-z.c')
-rw-r--r-- | progs/trivial/tri-z.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/progs/trivial/tri-z.c b/progs/trivial/tri-z.c index c8296a9704..335d2b90e2 100644 --- a/progs/trivial/tri-z.c +++ b/progs/trivial/tri-z.c @@ -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; } |