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trivial/tri-viewport: add keys for frustrum/ortho and z coordinate

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This commit is contained in:
Keith Whitwell 2009-04-21 11:40:59 +01:00
parent 6e05224bc4
commit e20f837f67
1 changed files with 77 additions and 43 deletions
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120
progs/trivial/tri-viewport.c
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@ -33,9 +33,16 @@ static float tx = 0;
static float ty = 0;
static float tw = 0;
static float th = 0;
static float z = -5;
static float win_width = 250;
static float win_height = 250;
static enum {
ORTHO,
FRUSTUM,
MODE_MAX
} mode = ORTHO;
static void Init(void)
{
@ -72,8 +79,21 @@ static void Key(unsigned char key, int x, int y)
case 'H':
th -= 1.0;
break;
case 'z':
z += 1.0;
break;
case 'Z':
z -= 1.0;
break;
case 'm':
mode++;
mode %= MODE_MAX;
break;
case ' ':
tw = th = tx = ty = 0;
z = -5;
mode = ORTHO;
break;
default:
break;
@ -89,12 +109,26 @@ static void Draw(void)
float h = th + win_height;
fprintf(stderr, "glViewport(%f %f %f %f)\n", tx, ty, w, h);
fprintf(stderr, "mode: %s\n", mode == FRUSTUM ? "FRUSTUM" : "ORTHO");
fprintf(stderr, "z: %f\n", z);
fflush(stderr);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
switch (mode) {
case FRUSTUM:
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
break;
case ORTHO:
default:
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
break;
}
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT);
@ -106,35 +140,35 @@ static void Draw(void)
glBegin(GL_POLYGON);
glColor3f(1,1,0);
glVertex3f(-100, -100, -30.0);
glVertex3f(-100, 100, -30.0);
glVertex3f(100, 100, -30.0);
glVertex3f(100, -100, -30.0);
glVertex3f(-100, -100, z);
glVertex3f(-100, 100, z);
glVertex3f(100, 100, z);
glVertex3f(100, -100, z);
glEnd();
glBegin(GL_POLYGON);
glColor3f(0,1,1);
glVertex3f(-10, -10, -30.0);
glVertex3f(-10, 10, -30.0);
glVertex3f(10, 10, -30.0);
glVertex3f(10, -10, -30.0);
glVertex3f(-10, -10, z);
glVertex3f(-10, 10, z);
glVertex3f(10, 10, z);
glVertex3f(10, -10, z);
glEnd();
glBegin(GL_POLYGON);
glColor3f(1,0,0);
glVertex3f(-2, -2, -30.0);
glVertex3f(-2, 2, -30.0);
glVertex3f(2, 2, -30.0);
glVertex3f(2, -2, -30.0);
glVertex3f(-2, -2, z);
glVertex3f(-2, 2, z);
glVertex3f(2, 2, z);
glVertex3f(2, -2, z);
glEnd();
glBegin(GL_POLYGON);
glColor3f(.5,.5,1);
glVertex3f(-1, -1, -30.0);
glVertex3f(-1, 1, -30.0);
glVertex3f(1, 1, -30.0);
glVertex3f(1, -1, -30.0);
glVertex3f(-1, -1, z);
glVertex3f(-1, 1, z);
glVertex3f(1, 1, z);
glVertex3f(1, -1, z);
glEnd();
/***********************************************************************
@ -142,11 +176,11 @@ static void Draw(void)
glViewport(0, 0, win_width, win_height);
glBegin(GL_LINES);
glColor3f(1,1,0);
glVertex3f(-1, 0, -30.0);
glVertex3f(1, 0, -30.0);
glVertex3f(-1, 0, z);
glVertex3f(1, 0, z);
glVertex3f(0, -1, -30.0);
glVertex3f(0, 1, -30.0);
glVertex3f(0, -1, z);
glVertex3f(0, 1, z);
glEnd();
@ -155,33 +189,33 @@ static void Draw(void)
glViewport(tx, ty, w, h);
glBegin(GL_TRIANGLES);
glColor3f(1,0,0);
glVertex3f(-1, -1, -30.0);
glVertex3f(0, -1, -30.0);
glVertex3f(-.5, -.5, -30.0);
glVertex3f(-1, -1, z);
glVertex3f(0, -1, z);
glVertex3f(-.5, -.5, z);
glColor3f(1,1,1);
glVertex3f(0, -1, -30.0);
glVertex3f(1, -1, -30.0);
glVertex3f(.5, -.5, -30.0);
glVertex3f(0, -1, z);
glVertex3f(1, -1, z);
glVertex3f(.5, -.5, z);
glVertex3f(-.5, -.5, -30.0);
glVertex3f(.5, -.5, -30.0);
glVertex3f(0, 0, -30.0);
glVertex3f(-.5, -.5, z);
glVertex3f(.5, -.5, z);
glVertex3f(0, 0, z);
glColor3f(0,1,0);
glVertex3f(1, 1, -30.0);
glVertex3f(0, 1, -30.0);
glVertex3f(.5, .5, -30.0);
glVertex3f(1, 1, z);
glVertex3f(0, 1, z);
glVertex3f(.5, .5, z);
glColor3f(1,1,1);
glVertex3f(0, 1, -30.0);
glVertex3f(-1, 1, -30.0);
glVertex3f(-.5, .5, -30.0);
glVertex3f(0, 1, z);
glVertex3f(-1, 1, z);
glVertex3f(-.5, .5, z);
glVertex3f(.5, .5, -30.0);
glVertex3f(-.5, .5, -30.0);
glVertex3f( 0, 0, -30.0);
glVertex3f(.5, .5, z);
glVertex3f(-.5, .5, z);
glVertex3f( 0, 0, z);
glEnd();
@ -196,11 +230,11 @@ static void Draw(void)
if (i == 0)
continue;
glVertex3f(-1, f, -30.0);
glVertex3f(1, f, -30.0);
glVertex3f(-1, f, z);
glVertex3f(1, f, z);
glVertex3f(f, -1, -30.0);
glVertex3f(f, 1, -30.0);
glVertex3f(f, -1, z);
glVertex3f(f, 1, z);
}
glEnd();