nuclear@2: #include "texture.h"
nuclear@2: #include "opengl.h"
nuclear@2: 
nuclear@2: Texture::Texture()
nuclear@2: {
nuclear@2: 	tex = 0;
nuclear@2: 	type = GL_TEXTURE_2D;
nuclear@2: }
nuclear@2: 
nuclear@2: Texture::~Texture()
nuclear@2: {
nuclear@2: 	destroy();
nuclear@2: }
nuclear@2: 
nuclear@2: void Texture::create2d(int xsz, int ysz)
nuclear@2: {
nuclear@2: 	destroy();
nuclear@2: 
nuclear@2: 	type = GL_TEXTURE_2D;
nuclear@2: 	img.create(xsz, ysz);
nuclear@2: 
nuclear@2: 	if(!tex) {
nuclear@2: 		glGenTextures(1, &tex);
nuclear@2: 	}
nuclear@2: 	glBindTexture(type, tex);
nuclear@2: 	glTexParameteri(type, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2: 	glTexParameteri(type, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2: 	glTexImage2D(type, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@2: }
nuclear@2: 
nuclear@2: void Texture::destroy()
nuclear@2: {
nuclear@2: 	if(tex) {
nuclear@2: 		glDeleteTextures(1, &tex);
nuclear@2: 	}
nuclear@2: }
nuclear@2: 
nuclear@2: void Texture::set_image(const Image &img)
nuclear@2: {
nuclear@2: 	this->img = img;
nuclear@2: 	create2d(img.get_width(), img.get_height());
nuclear@2: 
nuclear@2: 	glTexSubImage2D(type, 0, 0, 0, img.get_width(), img.get_height(),
nuclear@2: 			GL_RGBA, GL_UNSIGNED_BYTE, img.get_pixels());
nuclear@2: }
nuclear@2: 
nuclear@2: Image &Texture::get_image()
nuclear@2: {
nuclear@2: 	return img;
nuclear@2: }
nuclear@2: 
nuclear@2: const Image &Texture::get_image() const
nuclear@2: {
nuclear@2: 	return img;
nuclear@2: }
nuclear@2: 
nuclear@2: unsigned int Texture::get_texture_id() const
nuclear@2: {
nuclear@2: 	return tex;
nuclear@2: }
nuclear@2: 
nuclear@2: void Texture::bind(int tunit) const
nuclear@2: {
nuclear@2: 	glActiveTextureARB(GL_TEXTURE0_ARB + tunit);
nuclear@2: 	glBindTexture(type, tex);
nuclear@2: 	glActiveTextureARB(GL_TEXTURE0_ARB);
nuclear@2: }
nuclear@2: 
nuclear@2: bool Texture::load(const char *fname)
nuclear@2: {
nuclear@2: 	Image image;
nuclear@2: 	if(!image.load(fname)) {
nuclear@2: 		return false;
nuclear@2: 	}
nuclear@2: 	set_image(image);
nuclear@2: 	return true;
nuclear@2: }
nuclear@6: 
nuclear@6: unsigned int next_pow2(unsigned int x)
nuclear@6: {
nuclear@6: 	x -= 1;
nuclear@6: 	x |= x >> 1;
nuclear@6: 	x |= x >> 2;
nuclear@6: 	x |= x >> 4;
nuclear@6: 	x |= x >> 8;
nuclear@6: 	x |= x >> 16;
nuclear@6: 	return x + 1;
nuclear@6: }