void BL_Texture::InitNonPow2Tex(unsigned int *pix,int x,int y,bool mipmap)
{
int nx= smaller_pow2(x);
int ny= smaller_pow2(y);
unsigned int *newPixels = (unsigned int *)malloc(nx*ny*sizeof(unsigned int));
gluScaleImage(GL_RGBA, x, y, GL_UNSIGNED_BYTE, pix, nx,ny, GL_UNSIGNED_BYTE, newPixels);
glBindTexture(GL_TEXTURE_2D, mTexture );
if( mipmap ) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gluBuild2DMipmaps( GL_TEXTURE_2D, GL_RGBA, nx, ny, GL_RGBA, GL_UNSIGNED_BYTE, newPixels );
}
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, GL_RGBA, nx, ny, 0, GL_RGBA, GL_UNSIGNED_BYTE, newPixels );
}
if (GLEW_EXT_texture_filter_anisotropic)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, GPU_get_anisotropic());
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
free(newPixels);
}
int BL_Texture::GetPow2(int n)
{
if(!is_pow2(n))
n = smaller_pow2(n);
return n;
}
static void split_width(int x, int n, int *splitx, int *nx)
{
int a, newnx, waste;
/* if already power of two just use it */
if(is_pow2(x)) {
splitx[0]= x;
(*nx)++;
return;
}
if(n == 1) {
/* last part, we have to go larger */
splitx[0]= larger_pow2(x);
(*nx)++;
}
else {
/* two or more parts to go, use smaller part */
splitx[0]= smaller_pow2(x);
newnx= ++(*nx);
split_width(x-splitx[0], n-1, splitx+1, &newnx);
for(waste=0, a=0; a<n; a++)
waste += splitx[a];
/* if we waste more space or use the same amount,
* revert deeper splits and just use larger */
if(waste >= larger_pow2(x)) {
splitx[0]= larger_pow2(x);
memset(splitx+1, 0, sizeof(int)*(n-1));
}
else
*nx= newnx;
}
}