diff options
| -rw-r--r-- | progs/demos/shadowtex.c | 49 |
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 */ |