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use/test GL_SGIS_generate_mipmaps if available

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This commit is contained in:
Brian Paul
2002-12-10 16:51:28 +00:00
parent 6f458650bf
commit 76d2a77291
1 changed files with 41 additions and 3 deletions
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44
progs/demos/lodbias.c
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@@ -27,6 +27,7 @@
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
@@ -191,16 +192,53 @@ 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")) {
if (!glutExtensionSupported("GL_EXT_texture_lod_bias")) {
printf("Sorry, GL_EXT_texture_lod_bias not supported by this renderer.\n");
exit(1);
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
if (glutExtensionSupported("GL_SGIS_generate_mipmap")) {
/* test auto mipmap generation */
GLint width, height, i;
GLenum format;
GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format);
if (!image) {
printf("Error: could not load texture image %s\n", TEXTURE_FILE);
exit(1);
}
/* resize to 256 x 256 */
if (width != 256 || height != 256) {
GLubyte *newImage = malloc(256 * 256 * 4);
gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
256, 256, GL_UNSIGNED_BYTE, newImage);
free(image);
image = newImage;
}
printf("Using GL_SGIS_generate_mipmap\n");
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
glTexImage2D(GL_TEXTURE_2D, 0, format, 256, 256, 0,
format, GL_UNSIGNED_BYTE, image);
free(image);
/* make sure mipmap was really generated correctly */
width = height = 256;
for (i = 0; i < 9; i++) {
GLint w, h;
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
printf("Level %d size: %d x %d\n", i, w, h);
assert(w == width);
assert(h == height);
width /= 2;
height /= 2;
}
}
else if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
printf("Error: could not load texture image %s\n", TEXTURE_FILE);
exit(1);
}