press 'f' to toggle front-face winding
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dc313b5783
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a2e471e05e
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@ -29,6 +29,7 @@
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static GLenum doubleBuffer;
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static GLenum doubleBuffer;
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static GLint cullmode = 0;
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static GLint cullmode = 0;
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static GLenum front = GL_CCW; /* GL default */
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static void cull(void)
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static void cull(void)
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{
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{
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@ -76,11 +77,16 @@ static void Reshape(int width, int height)
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static void Key(unsigned char key, int x, int y)
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static void Key(unsigned char key, int x, int y)
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{
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{
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switch (key) {
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switch (key) {
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case 27:
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case 27:
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exit(1);
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exit(1);
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case 'c':
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case 'c':
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cull();
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cull();
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break;
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break;
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case 'f':
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front = ((front == GL_CCW) ? GL_CW : GL_CCW);
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glFrontFace(front);
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printf("front face = %s\n", front == GL_CCW ? "GL_CCW" : "GL_CW");
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break;
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default:
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default:
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return;
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return;
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}
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}
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@ -92,7 +98,7 @@ static void Draw(void)
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glClear(GL_COLOR_BUFFER_BIT);
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glClear(GL_COLOR_BUFFER_BIT);
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glBegin(GL_TRIANGLES);
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glBegin(GL_TRIANGLES);
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/* back-facing */
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/* CCW / front-facing */
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glColor3f(0,0,.7);
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glColor3f(0,0,.7);
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glVertex3f(-0.1, -0.9, -30.0);
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glVertex3f(-0.1, -0.9, -30.0);
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glColor3f(.8,0,0);
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glColor3f(.8,0,0);
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@ -100,7 +106,7 @@ static void Draw(void)
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glColor3f(0,.9,0);
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glColor3f(0,.9,0);
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glVertex3f(-0.9, 0.0, -30.0);
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glVertex3f(-0.9, 0.0, -30.0);
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/* front-facing */
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/* CW / back-facing */
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glColor3f(0,0,.7);
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glColor3f(0,0,.7);
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glVertex3f( 0.1, -0.9, -30.0);
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glVertex3f( 0.1, -0.9, -30.0);
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glColor3f(.8,0,0);
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glColor3f(.8,0,0);
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