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added filtering option, compute shadow tex size from window size

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This commit is contained in:
Brian Paul 2001-02-26 18:26:32 +00:00
parent eb198d2702
commit 511378b05d
1 changed files with 36 additions and 13 deletions
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49
progs/demos/shadowtex.c
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@ -1,4 +1,4 @@
/* $Id: shadowtex.c,v 1.2 2001/02/20 17:06:35 brianp Exp $ */
/* $Id: shadowtex.c,v 1.3 2001/02/26 18:26:32 brianp Exp $ */
/*
* Shadow demo using the GL_SGIX_depth_texture, GL_SGIX_shadow and
@ -55,6 +55,7 @@ static GLfloat ShadowNear = 4.0, ShadowFar = 24.0;
static GLint ShadowTexWidth = 256, ShadowTexHeight = 256;
static GLboolean ShowDepth = GL_FALSE;
static GLboolean LinearFilter = GL_FALSE;
static GLfloat ShadowImage[256*256];
@ -215,22 +216,30 @@ Display(void)
* Step 3: render scene from point of view of the camera
*/
glViewport(0, 0, WindowWidth, WindowHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-ar, ar, -1.0, 1.0, 4.0, 50.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -22.0);
glRotatef(Xrot, 1, 0, 0);
glRotatef(Yrot, 0, 1, 0);
glRotatef(Zrot, 0, 0, 1);
if (ShowDepth) {
ShowDepthBuffer(WindowWidth, WindowHeight, 1, 0);
}
else {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-ar, ar, -1.0, 1.0, 4.0, 50.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -22.0);
glRotatef(Xrot, 1, 0, 0);
glRotatef(Yrot, 0, 1, 0);
glRotatef(Zrot, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLightfv(GL_LIGHT0, GL_POSITION, LightPos);
glEnable(GL_TEXTURE_2D);
if (LinearFilter) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
ShadowMatrix(LightPos, SpotDir, SpotAngle, ShadowNear, ShadowFar);
EnableTexgen();
DrawScene();
@ -247,6 +256,16 @@ Reshape(int width, int height)
{
WindowWidth = width;
WindowHeight = height;
if (width >= 512 && height >= 512) {
ShadowTexWidth = ShadowTexHeight = 512;
}
else if (width >= 256 && height >= 256) {
ShadowTexWidth = ShadowTexHeight = 256;
}
else {
ShadowTexWidth = ShadowTexHeight = 128;
}
printf("Using %d x %d depth texture\n", ShadowTexWidth, ShadowTexHeight);
}
@ -275,13 +294,19 @@ Key(unsigned char key, int x, int y)
break;
case 'b':
Bias -= 0.01;
printf("Bias %g\n", Bias);
break;
case 'B':
Bias += 0.01;
printf("Bias %g\n", Bias);
break;
case 'd':
ShowDepth = !ShowDepth;
break;
case 'f':
LinearFilter = !LinearFilter;
printf("%s filtering\n", LinearFilter ? "Bilinear" : "Nearest");
break;
case 'z':
Zrot -= step;
break;
@ -293,7 +318,6 @@ Key(unsigned char key, int x, int y)
break;
}
glutPostRedisplay();
printf("Bias %g\n", Bias);
}
@ -343,8 +367,6 @@ Init(void)
exit(1);
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
#ifdef GL_SGIX_shadow
@ -369,6 +391,7 @@ PrintHelp(void)
printf("Keys:\n");
printf(" a = toggle animation\n");
printf(" d = toggle display of depth texture\n");
printf(" f = toggle nearest/bilinear texture filtering\n");
printf(" b/B = decrease/increase shadow map Z bias\n");
printf(" cursor keys = rotate scene\n");
printf(" <shift> + cursor keys = rotate light source\n");