void CubemapStore::Load(const std::string& name, const RawImage& img, GLuint level /*= 0*/)
{
CubemapDescription cubemap;
glGenTextures(1, &cubemap.id);
glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap.id);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
// Calc image params
int stride = img.Width();
int width = img.Width() / 4;
int height = img.Height() / 3;
int channels = img.Channels();
// Set row read stride
glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
// Upload image data
for (int i = 0; i < 6; ++i)
{
int xoff, yoff;
int target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + i;
crossFaceOffset(target, &xoff, &yoff, stride);
glTexImage2D(
target, level, channels == 3 ? GL_RGB : GL_RGBA,
width, height,
0, channels == 3 ? GL_RGB : GL_RGBA, GL_UNSIGNED_BYTE,
img.Data() + (yoff * stride + xoff) * channels);
}
// Reset row stride
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
mCubemaps.insert({name, cubemap});
}
bool SaveRawImageToFile(const RawImage& img, const char* filename)
{
const int w = img.Width();
const int h = img.Height();
const int bpp = img.BytesPerPixel();
const ScopedFilePointer fp(filename, "wb");
if (!fp)
{
return false;
}
const void* p = img.Bits();
if (!p)
{
return false;
}
fwrite(p, w * h * bpp, 1, fp);
return true;
}