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press 'f' to toggle front-face winding

This commit is contained in:
Brian 2007-07-13 14:25:28 -06:00
parent dc313b5783
commit a2e471e05e
1 changed files with 10 additions and 4 deletions
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14
progs/trivial/tri-cull.c
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@ -29,6 +29,7 @@
static GLenum doubleBuffer;
static GLint cullmode = 0;
static GLenum front = GL_CCW; /* GL default */
static void cull(void)
{
@ -76,11 +77,16 @@ static void Reshape(int width, int height)
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
case 27:
exit(1);
case 'c':
cull();
break;
case 'f':
front = ((front == GL_CCW) ? GL_CW : GL_CCW);
glFrontFace(front);
printf("front face = %s\n", front == GL_CCW ? "GL_CCW" : "GL_CW");
break;
default:
return;
}
@ -92,7 +98,7 @@ static void Draw(void)
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
/* back-facing */
/* CCW / front-facing */
glColor3f(0,0,.7);
glVertex3f(-0.1, -0.9, -30.0);
glColor3f(.8,0,0);
@ -100,7 +106,7 @@ static void Draw(void)
glColor3f(0,.9,0);
glVertex3f(-0.9, 0.0, -30.0);
/* front-facing */
/* CW / back-facing */
glColor3f(0,0,.7);
glVertex3f( 0.1, -0.9, -30.0);
glColor3f(.8,0,0);