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-rw-r--r--progs/demos/shadowtex.c49
1 files changed, 43 insertions, 6 deletions
diff --git a/progs/demos/shadowtex.c b/progs/demos/shadowtex.c
index 112ee0dad0..36763287a9 100644
--- a/progs/demos/shadowtex.c
+++ b/progs/demos/shadowtex.c
@@ -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 */