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use perspective projection, press r/R to rotate the quad

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This commit is contained in:
Brian 2007-09-18 12:55:53 -06:00
parent 2a460f6185
commit 6fbbeed690
1 changed files with 21 additions and 4 deletions
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25
progs/trivial/quad-tex-2d.c
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@ -30,6 +30,7 @@
static GLenum Target = GL_TEXTURE_2D;
static GLenum Filter = GL_NEAREST;
GLenum doubleBuffer;
static float Rot = 0;
static void Init(void)
{
@ -81,13 +82,24 @@ static void Reshape(int width, int height)
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
#if 0
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
#else
glFrustum(-1, 1, -1, 1, 10, 20);
#endif
glMatrixMode(GL_MODELVIEW);
glTranslatef(0, 0, -15);
}
static void Key(unsigned char key, int x, int y)
{
switch (key) {
case 'r':
Rot += 10.0;
break;
case 'R':
Rot -= 10.0;
break;
case 27:
exit(0);
default:
@ -100,17 +112,22 @@ static void Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(Rot, 0, 1, 0);
glBegin(GL_QUADS);
glTexCoord2f(1,0);
glVertex3f( 0.9, -0.9, -30.0);
glVertex3f( 0.9, -0.9, 0.0);
glTexCoord2f(1,1);
glVertex3f( 0.9, 0.9, -30.0);
glVertex3f( 0.9, 0.9, 0.0);
glTexCoord2f(0,1);
glVertex3f(-0.9, 0.9, -30.0);
glVertex3f(-0.9, 0.9, 0.0);
glTexCoord2f(0,0);
glVertex3f(-0.9, -0.9, -30.0);
glVertex3f(-0.9, -0.9, 0.0);
glEnd();
glPopMatrix();
glFlush();
if (doubleBuffer) {