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exercise GL_EXT_shadow_funcs

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This commit is contained in:
Brian Paul 2002-03-23 16:34:18 +00:00
parent 636b2801d9
commit 3c70f6f2ac
1 changed files with 32 additions and 1 deletions
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33
progs/demos/shadowtex.c
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@ -1,4 +1,4 @@
/* $Id: shadowtex.c,v 1.5 2002/02/16 14:54:18 brianp Exp $ */
/* $Id: shadowtex.c,v 1.6 2002/03/23 16:34:18 brianp Exp $ */
/*
* Shadow demo using the GL_ARB_depth_texture, GL_ARB_shadow and
@ -7,6 +7,8 @@
* Brian Paul
* 19 Feb 2001
*
* Added GL_EXT_shadow_funcs support on 23 March 2002
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
@ -67,6 +69,16 @@ static GLfloat Bias = -0.06;
static GLboolean Anim = GL_TRUE;
static GLboolean HaveEXTshadowFuncs = GL_FALSE;
static GLint Operator = 0;
static const GLenum OperatorFunc[8] = {
GL_LEQUAL, GL_LESS, GL_GEQUAL, GL_GREATER,
GL_EQUAL, GL_NOTEQUAL, GL_ALWAYS, GL_NEVER };
static const char *OperatorName[8] = {
"GL_LEQUAL", "GL_LESS", "GL_GEQUAL", "GL_GREATER",
"GL_EQUAL", "GL_NOTEQUAL", "GL_ALWAYS", "GL_NEVER" };
static GLuint DisplayMode;
#define SHOW_NORMAL 0
#define SHOW_DEPTH_IMAGE 1
@ -237,6 +249,7 @@ Display(void)
{
GLfloat ar = (GLfloat) WindowWidth / (GLfloat) WindowHeight;
GLfloat d;
GLenum error;
ComputeLightPos(LightDist, LightLatitude, LightLongitude,
LightPos, SpotDir);
@ -346,6 +359,11 @@ Display(void)
}
glutSwapBuffers();
error = glGetError();
if (error) {
printf("GL Error: %s\n", gluErrorString(error));
}
}
@ -415,6 +433,16 @@ Key(unsigned char key, int x, int y)
case ' ':
DisplayMode = SHOW_NORMAL;
break;
case 'o':
if (HaveEXTshadowFuncs) {
Operator++;
if (Operator >= 8)
Operator = 0;
printf("Operator: %s\n", OperatorName[Operator]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB,
OperatorFunc[Operator]);
}
break;
case 'z':
Zrot -= step;
break;
@ -484,6 +512,7 @@ Init(void)
}
printf("Using GL_SGIX_depth_texture and GL_SGIX_shadow\n");
#endif
HaveEXTshadowFuncs = glutExtensionSupported("GL_EXT_shadow_funcs");
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@ -541,6 +570,8 @@ PrintHelp(void)
printf(" b/B = decrease/increase shadow map Z bias\n");
printf(" cursor keys = rotate scene\n");
printf(" <shift> + cursor keys = rotate light source\n");
if (HaveEXTshadowFuncs)
printf(" o = cycle through comparison modes\n");
}