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Support cards that have ARB_fp but not ARB_shadow.

This commit is contained in:
Ian Romanick 2007-10-17 12:05:55 -07:00
parent 374158b044
commit b961eccc92
1 changed files with 49 additions and 13 deletions
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62
progs/demos/shadowtex.c
View File

@ -84,6 +84,7 @@ static const char *FragProgNames[] = {
"program with \"OPTION ARB_fragment_program_shadow\"",
};
static GLboolean HaveShadow = GL_FALSE;
static GLboolean HaveFBO = GL_FALSE;
static GLboolean UseFBO = GL_FALSE;
static GLboolean HaveVP = GL_FALSE;
@ -529,7 +530,10 @@ ShowShadowMap(void)
DisableTexgen();
/* interpret texture's depth values as luminance values */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_NONE);
if (HaveShadow) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_NONE);
}
glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE_ARB, GL_LUMINANCE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
@ -596,7 +600,9 @@ Display(void)
}
if (DisplayMode == SHOW_DEPTH_MAPPING) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_NONE);
if (HaveShadow) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB, GL_NONE);
}
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_2D);
@ -614,8 +620,10 @@ Display(void)
}
else {
assert(DisplayMode == SHOW_SHADOWS);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_COMPARE_R_TO_TEXTURE_ARB);
if (HaveShadow) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_COMPARE_R_TO_TEXTURE_ARB);
}
if (curr_frag > 0) {
glEnable(GL_FRAGMENT_PROGRAM_ARB);
@ -723,6 +731,10 @@ Key(unsigned char key, int x, int y)
break;
case 'M':
curr_frag = (1 + curr_frag) % max_frag;
if (!HaveShadow && (curr_frag == 0)) {
curr_frag = 1;
}
printf("Using fragment %s\n", FragProgNames[curr_frag]);
if (HaveFP) {
@ -740,8 +752,10 @@ Key(unsigned char key, int x, int y)
if (Operator >= 8)
Operator = 0;
printf("Operator: %s\n", OperatorName[Operator]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB,
OperatorFunc[Operator]);
if (HaveShadow) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC_ARB,
OperatorFunc[Operator]);
}
}
break;
case 'p':
@ -858,17 +872,31 @@ Init(void)
{
static const GLfloat borderColor[4] = {1.0, 0.0, 0.0, 0.0};
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");
if (!glutExtensionSupported("GL_ARB_depth_texture")) {
printf("Sorry, this demo requires the GL_ARB_depth_texture extension\n");
exit(1);
}
printf("Using GL_ARB_depth_texture and GL_ARB_shadow\n");
HaveShadow = glutExtensionSupported("GL_ARB_shadow");
HaveVP = glutExtensionSupported("GL_ARB_vertex_program");
HaveFP = glutExtensionSupported("GL_ARB_fragment_program");
HaveFP_Shadow = glutExtensionSupported("GL_ARB_fragment_program_shadow");
if (!HaveShadow && !HaveFP) {
printf("Sorry, this demo requires either the GL_ARB_shadow extension "
"or the GL_ARB_fragment_program extension\n");
exit(1);
}
printf("Using GL_ARB_depth_texture\n");
if (HaveShadow) {
printf("and GL_ARB_shadow\n");
}
if (HaveFP) {
printf("and GL_ARB_fragment_program\n");
}
HaveShadowAmbient = glutExtensionSupported("GL_ARB_shadow_ambient");
if (HaveShadowAmbient) {
printf("and GL_ARB_shadow_ambient\n");
@ -895,9 +923,12 @@ Init(void)
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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);
if (HaveShadow) {
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);
}
if (HaveShadowAmbient) {
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FAIL_VALUE_ARB, 0.3);
@ -954,6 +985,11 @@ Init(void)
max_frag = 3;
}
if (!HaveShadow) {
curr_frag = 1;
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, frag_progs[curr_frag]);
}
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);