diff options
Diffstat (limited to 'progs/demos/shadowtex.c')
-rw-r--r-- | progs/demos/shadowtex.c | 62 |
1 files changed, 49 insertions, 13 deletions
diff --git a/progs/demos/shadowtex.c b/progs/demos/shadowtex.c index 59253e8c1e..c2d40bda74 100644 --- a/progs/demos/shadowtex.c +++ b/progs/demos/shadowtex.c @@ -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); |