void BL_Texture::InitNonPow2Tex(unsigned int *pix,int x,int y,bool mipmap)
{
int nx= power_of_2_min_i(x);
int ny= power_of_2_min_i(y);
ImBuf *ibuf = IMB_allocFromBuffer(pix, NULL, x, y);
IMB_scaleImBuf(ibuf, nx, ny);
glBindTexture(GL_TEXTURE_2D, mTexture );
if ( mipmap ) {
int i;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
IMB_makemipmap(ibuf, true);
for (i = 0; i < ibuf->miptot; i++) {
ImBuf *mip = IMB_getmipmap(ibuf, i);
glTexImage2D(GL_TEXTURE_2D, i, GL_RGBA, mip->x, mip->y, 0, GL_RGBA, GL_UNSIGNED_BYTE, mip->rect);
}
}
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, ibuf->rect );
}
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);
IMB_freeImBuf(ibuf);
}
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_power_of_2_i(x)) {
splitx[0] = x;
(*nx)++;
return;
}
if (n == 1) {
/* last part, we have to go larger */
splitx[0] = power_of_2_max_i(x);
(*nx)++;
}
else {
/* two or more parts to go, use smaller part */
splitx[0] = power_of_2_min_i(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 >= power_of_2_max_i(x)) {
splitx[0] = power_of_2_max_i(x);
memset(splitx + 1, 0, sizeof(int) * (n - 1));
}
else
*nx = newnx;
}
}
int BL_Texture::GetPow2(int n)
{
if (!is_power_of_2_i(n))
n = power_of_2_min_i(n);
return n;
}