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added missing GL_MAX_TEXTURE_LOD_BIAS_EXT query

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Brian Paul
2001-11-06 15:53:00 +00:00
parent 85e7d7c1d8
commit 87c964d388
6 changed files with 40 additions and 7 deletions
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9
progs/demos/lodbias.c
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@@ -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;
}