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use 'c' to cycle through polygon cull modes

This commit is contained in:
Brian 2007-07-10 11:39:08 -06:00
parent 8733ee9dc9
commit 9a89cc3b6b
1 changed files with 54 additions and 24 deletions
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78
progs/trivial/tri-cull.c
View File

@ -27,25 +27,44 @@
#include <stdlib.h>
#include <GL/glut.h>
static GLenum doubleBuffer;
static GLint cullmode = 0;
#define CI_OFFSET_1 16
#define CI_OFFSET_2 32
GLenum doubleBuffer;
static void cull(void)
{
cullmode = (cullmode + 1) % 4;
if (cullmode == 0) {
glCullFace(GL_FRONT);
glEnable(GL_CULL_FACE);
printf("cull GL_FRONT\n");
}
else if (cullmode == 1) {
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
printf("cull GL_BACK\n");
}
else if (cullmode == 2) {
glCullFace(GL_FRONT_AND_BACK);
glEnable(GL_CULL_FACE);
printf("cull GL_FRONT_AND_BACK\n");
}
else {
glDisable(GL_CULL_FACE);
printf("cull none\n");
}
}
static void Init(void)
{
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
glClearColor(0.0, 0.0, 1.0, 0.0);
glClearColor(0.0, 0.0, 1.0, 0.0);
cull();
}
static void Reshape(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
@ -56,15 +75,16 @@ static void Reshape(int width, int height)
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(1);
default:
return;
}
glutPostRedisplay();
switch (key) {
case 27:
exit(1);
case 'c':
cull();
break;
default:
return;
}
glutPostRedisplay();
}
static void Draw(void)
@ -72,12 +92,22 @@ static void Draw(void)
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glColor3f(0,0,1);
glVertex3f( -1.5, 0.5, -30.0);
glColor3f(1,0,0);
glVertex3f( 0, 2.0, -30.0);
glColor3f(0,1,0);
glVertex3f(-1.5, 2.0, -30.0);
/* back-facing */
glColor3f(0,0,.7);
glVertex3f(-0.1, -0.9, -30.0);
glColor3f(.8,0,0);
glVertex3f(-0.1, 0.9, -30.0);
glColor3f(0,.9,0);
glVertex3f(-0.9, 0.0, -30.0);
/* front-facing */
glColor3f(0,0,.7);
glVertex3f( 0.1, -0.9, -30.0);
glColor3f(.8,0,0);
glVertex3f( 0.1, 0.9, -30.0);
glColor3f(0,.9,0);
glVertex3f( 0.9, 0.0, -30.0);
glEnd();
glFlush();
@ -132,5 +162,5 @@ int main(int argc, char **argv)
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
return 0;
}