diff options
Diffstat (limited to 'progs/demos/lodbias.c')
| -rw-r--r-- | progs/demos/lodbias.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/progs/demos/lodbias.c b/progs/demos/lodbias.c index b2fab0b4eb7..3533241be55 100644 --- a/progs/demos/lodbias.c +++ b/progs/demos/lodbias.c @@ -40,7 +40,7 @@ static GLfloat Xrot = 0, Yrot = -30, Zrot = 0; static GLboolean Anim = GL_TRUE; static GLint Bias = 0, BiasStepSign = +1; /* ints avoid fp precision problem */ -static GLint BiasMin = -200, BiasMax = 500; +static GLint BiasMin = -400, BiasMax = 400; @@ -192,6 +192,8 @@ static void SpecialKey( int key, int x, int y ) static void Init( void ) { const char *exten = (const char *) glGetString(GL_EXTENSIONS); + GLfloat maxBias; + if (!strstr(exten, "GL_EXT_texture_lod_bias")) { printf("Sorry, GL_EXT_texture_lod_bias not supported by this renderer.\n"); exit(1); @@ -207,6 +209,11 @@ static void Init( void ) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); + + glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS_EXT, &maxBias); + printf("LOD bias range: [%g, %g]\n", -maxBias, maxBias); + BiasMin = -100 * maxBias; + BiasMax = 100 * maxBias; } |