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#include <assert.h>
#include <stdlib.h> /* for exit */
#include "gli.h"
extern const char *myProgramName;
gliGenericImage *
readImage(const char *filename)
{
FILE *file;
gliGenericImage *image;
int yFlip = 1;
file = fopen(filename, "rb");
if (file == NULL) {
printf("%s: could not open \"%s\"\n", myProgramName, filename);
exit(1);
}
image = gliReadTGA(file, filename, yFlip);
if (image == NULL) {
printf("%s: \"%s\" is not a TGA image\n", myProgramName, filename);
exit(1);
}
fclose(file);
return image;
}
static int
roundUp(int v)
{
int i;
for (i=0; i<31; i++) {
if (v <= (1<<i)) {
return 1<<i;
}
}
return 1<<31;
}
gliGenericImage *
loadTextureDecal(gliGenericImage *image, int mipmap)
{
int needsScaling;
int nw, nh;
nw = roundUp(image->width);
nh = roundUp(image->height);
if ((nw != image->width) || (nh != image->height)) {
needsScaling = 1;
} else {
needsScaling = 0;
}
assert(image->format != GL_COLOR_INDEX);
if (needsScaling) {
gliGenericImage *nimage;
nimage = gliScaleImage(image, nw, nh);
gliFree(image);
image = nimage;
}
#ifdef __APPLE__
mipmap = 0; /* Why doesn't Apple's gluBuild2DMipmaps work correctly? */
#endif
if (mipmap) {
GLint status;
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
status = gluBuild2DMipmaps(GL_TEXTURE_2D, image->internalFormat,
nw, nh, image->format, image->type, image->pixels);
if (status == GLU_INVALID_ENUM) {
gliConvertImageToCoreFormat(image);
status = gluBuild2DMipmaps(GL_TEXTURE_2D, image->internalFormat,
nw, nh, image->format, image->type, image->pixels);
}
assert(status == 0);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, image->internalFormat,
nw, nh, 0,
image->format, image->type, image->pixels);
}
return image;
}
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