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use 'p' key to toggle use of GL_EXT_packed_depth_stencil

This commit is contained in:
Brian Paul 2006-03-15 01:44:03 +00:00
parent b7e3e0d64e
commit 10f08cc202
1 changed files with 42 additions and 8 deletions
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50
progs/demos/shadowtex.c
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@ -41,7 +41,6 @@
#undef GL_ARB_shadow_ambient
#endif
#define DEG_TO_RAD (3.14159 / 180.0)
static GLint WindowWidth = 450, WindowHeight = 300;
@ -67,6 +66,7 @@ static GLfloat Bias = -0.06;
static GLboolean Anim = GL_TRUE;
static GLboolean UsePackedDepthStencil = GL_FALSE;
static GLboolean HaveEXTshadowFuncs = GL_FALSE;
static GLint Operator = 0;
static const GLenum OperatorFunc[8] = {
@ -266,7 +266,7 @@ Display(void)
0, 1, 0); /* up */
glViewport(0, 0, ShadowTexWidth, ShadowTexHeight);
glClear(GL_DEPTH_BUFFER_BIT);
glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
DrawScene();
/*
@ -274,9 +274,21 @@ Display(void)
*/
if (DisplayMode == SHOW_DEPTH_MAPPING) {
/* load depth image as gray-scale luminance texture */
GLfloat *depth = (GLfloat *) malloc(ShadowTexWidth * ShadowTexHeight
* sizeof(GLfloat));
if (depth) {
if (UsePackedDepthStencil) {
GLuint *depth = (GLuint *) malloc(ShadowTexWidth * ShadowTexHeight
* sizeof(GLuint));
assert(depth);
glReadPixels(0, 0, ShadowTexWidth, ShadowTexHeight,
GL_DEPTH_STENCIL_EXT, GL_UNSIGNED_INT_24_8_EXT, depth);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE,
ShadowTexWidth, ShadowTexHeight, 0,
GL_LUMINANCE, GL_UNSIGNED_INT, depth);
free(depth);
}
else {
GLfloat *depth = (GLfloat *) malloc(ShadowTexWidth * ShadowTexHeight
* sizeof(GLfloat));
assert(depth);
glReadPixels(0, 0, ShadowTexWidth, ShadowTexHeight,
GL_DEPTH_COMPONENT, GL_FLOAT, depth);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE,
@ -287,8 +299,18 @@ Display(void)
}
else {
/* The normal shadow case */
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
0, 0, ShadowTexWidth, ShadowTexHeight, 0);
if (UsePackedDepthStencil) {
GLint intFormat;
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_EXT,
0, 0, ShadowTexWidth, ShadowTexHeight, 0);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0,
GL_TEXTURE_INTERNAL_FORMAT, &intFormat);
assert(intFormat == GL_DEPTH_STENCIL_EXT);
}
else {
glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
0, 0, ShadowTexWidth, ShadowTexHeight, 0);
}
}
/*
@ -447,6 +469,17 @@ Key(unsigned char key, int x, int y)
OperatorFunc[Operator]);
}
break;
case 'p':
UsePackedDepthStencil = !UsePackedDepthStencil;
if (UsePackedDepthStencil
&& !glutExtensionSupported("GL_EXT_packed_depth_stencil")) {
printf("Sorry, GL_EXT_packed_depth_stencil not supported\n");
UsePackedDepthStencil = GL_FALSE;
}
else {
printf("Use GL_DEPTH_STENCIL_EXT: %d\n", UsePackedDepthStencil);
}
break;
case 'z':
Zrot -= step;
break;
@ -572,6 +605,7 @@ PrintHelp(void)
printf(" n = show normal, shadowed image\n");
printf(" f = toggle nearest/bilinear texture filtering\n");
printf(" b/B = decrease/increase shadow map Z bias\n");
printf(" p = toggle use of packed depth/stencil\n");
printf(" cursor keys = rotate scene\n");
printf(" <shift> + cursor keys = rotate light source\n");
if (HaveEXTshadowFuncs)
@ -585,7 +619,7 @@ main(int argc, char *argv[])
glutInit(&argc, argv);
glutInitWindowPosition(0, 0);
glutInitWindowSize(WindowWidth, WindowHeight);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL);
glutCreateWindow(argv[0]);
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);