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updated to use GL_ARB_depth_texture, GL_ARB_shadow, GL_ARB_shadow_ambient

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This commit is contained in:
Brian Paul 2002-02-16 14:54:18 +00:00
parent 9ac7182ec4
commit f204c9d2bb
1 changed files with 43 additions and 6 deletions
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49
progs/demos/shadowtex.c
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@ -1,8 +1,8 @@
/* $Id: shadowtex.c,v 1.4 2001/02/28 18:41:50 brianp Exp $ */
/* $Id: shadowtex.c,v 1.5 2002/02/16 14:54:18 brianp Exp $ */
/*
* Shadow demo using the GL_SGIX_depth_texture, GL_SGIX_shadow and
* GL_SGIX_shadow_ambient extensions.
* Shadow demo using the GL_ARB_depth_texture, GL_ARB_shadow and
* GL_ARB_shadow_ambient extensions (or the old SGIX extensions).
*
* Brian Paul
* 19 Feb 2001
@ -35,6 +35,12 @@
#include <GL/glut.h>
#include "../util/showbuffer.c"
#if 0 /* change to 1 if you want to use the old SGIX extensions */
#undef GL_ARB_depth_texture
#undef GL_ARB_shadow
#undef GL_ARB_shadow_ambient
#endif
#define DEG_TO_RAD (3.14159 / 180.0)
@ -302,7 +308,11 @@ Display(void)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
if (DisplayMode == SHOW_DEPTH_MAPPING) {
#if defined(GL_ARB_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_NONE);
#elif defined(GL_SGIX_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_SGIX, GL_FALSE);
#endif
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
MakeShadowMatrix(LightPos, SpotDir, SpotAngle, ShadowNear, ShadowFar);
@ -318,7 +328,12 @@ Display(void)
}
else {
assert(DisplayMode == SHOW_NORMAL);
#if defined(GL_ARB_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_COMPARE_R_TO_TEXTURE_ARB);
#elif defined(GL_SGIX_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_SGIX, GL_TRUE);
#endif
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_TEXTURE_2D);
MakeShadowMatrix(LightPos, SpotDir, SpotAngle, ShadowNear, ShadowFar);
@ -454,11 +469,21 @@ SpecialKey(int key, int x, int y)
static void
Init(void)
{
#if defined(GL_ARB_depth_texture) && defined(GL_ARB_shadow)
if (!glutExtensionSupported("GL_ARB_depth_texture") ||
!glutExtensionSupported("GL_ARB_shadow")) {
printf("Sorry, this demo requires the GL_ARB_depth_texture and GL_ARB_shadow extensions\n");
exit(1);
}
printf("Using GL_ARB_depth_texture and GL_ARB_shadow\n");
#elif defined(GL_SGIX_depth_texture) && defined(GL_SGIX_shadow)
if (!glutExtensionSupported("GL_SGIX_depth_texture") ||
!glutExtensionSupported("GL_SGIX_shadow")) {
printf("Sorry, this demo requires the GL_SGIX_depth_texture and GL_SGIX_shadow extensions\n");
exit(1);
}
printf("Using GL_SGIX_depth_texture and GL_SGIX_shadow\n");
#endif
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@ -466,13 +491,25 @@ Init(void)
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
#ifdef GL_SGIX_shadow
#if defined(GL_ARB_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_COMPARE_R_TO_TEXTURE_ARB);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB, GL_LEQUAL);
#elif defined(GL_SGIX_shadow)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_OPERATOR_SGIX,
GL_TEXTURE_LEQUAL_R_SGIX);
#endif
#ifdef GL_SGIX_shadow_ambient
if (glutExtensionSupported("GL_SGIX_shadow_ambient"))
#if defined(GL_ARB_shadow_ambient)
if (glutExtensionSupported("GL_ARB_shadow_ambient")) {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FAIL_VALUE_ARB, 0.3);
printf("and GL_ARB_shadow_ambient\n");
}
#elif defined(GL_SGIX_shadow_ambient)
if (glutExtensionSupported("GL_SGIX_shadow_ambient")) {
glTexParameterf(GL_TEXTURE_2D, GL_SHADOW_AMBIENT_SGIX, 0.3);
printf("and GL_SGIX_shadow_ambient\n");
}
#endif
/* setup 1-D grayscale texture image for SHOW_DISTANCE mode */