nuclear@0: #include <stdio.h>
nuclear@0: #include <imago2.h>
nuclear@0: #include "texture.h"
nuclear@0: #include "opengl.h"
nuclear@0: 
nuclear@0: Texture::Texture()
nuclear@0: {
nuclear@0: 	width = height = tex_width = tex_height = 0;
nuclear@0: 	tex = 0;
nuclear@0: }
nuclear@0: 
nuclear@0: Texture::~Texture()
nuclear@0: {
nuclear@0: 	if(tex) {
nuclear@0: 		glDeleteTextures(1, &tex);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static unsigned int next_pow2(unsigned int x)
nuclear@0: {
nuclear@0: 	--x;
nuclear@0: 	x |= x >> 1;
nuclear@0: 	x |= x >> 2;
nuclear@0: 	x |= x >> 4;
nuclear@0: 	x |= x >> 8;
nuclear@0: 	x |= x >> 16;
nuclear@0: 	return x + 1;
nuclear@0: }
nuclear@0: 
nuclear@0: bool Texture::load(const char *fname)
nuclear@0: {
nuclear@0: 	img_pixmap img;
nuclear@0: 	img_init(&img);
nuclear@0: 	if(img_load(&img, fname) == -1) {
nuclear@0: 		fprintf(stderr, "failed to load texture: %s\n", fname);
nuclear@0: 		img_destroy(&img);
nuclear@0: 		return false;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	unsigned int intfmt = img_glintfmt(&img);
nuclear@0: 	unsigned int pixfmt = img_glfmt(&img);
nuclear@0: 	unsigned int pixtype = img_gltype(&img);
nuclear@0: 
nuclear@0: 	// if we have the sRGB extension, change the internal formats to sRGB
nuclear@0: 	if(GLEW_EXT_texture_sRGB) {
nuclear@0: 		switch(intfmt) {
nuclear@0: 		case 3:
nuclear@0: 		case GL_RGB:
nuclear@0: 			intfmt = GL_SRGB_EXT;
nuclear@0: 			break;
nuclear@0: 		case 4:
nuclear@0: 		case GL_RGBA:
nuclear@0: 			intfmt = GL_SRGB_ALPHA;
nuclear@0: 			break;
nuclear@0: 		case 1:
nuclear@0: 		case GL_LUMINANCE:
nuclear@0: 			intfmt = GL_SLUMINANCE;
nuclear@0: 			break;
nuclear@0: 		default:
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	width = img.width;
nuclear@0: 	height = img.height;
nuclear@0: 	tex_width = next_pow2(width);
nuclear@0: 	tex_height = next_pow2(height);
nuclear@0: 
nuclear@0: 	if(!tex) {
nuclear@0: 		glGenTextures(1, &tex);
nuclear@0: 	}
nuclear@0: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0: 
nuclear@0: 	if(GLEW_SGIS_generate_mipmap) {
nuclear@0: 		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
nuclear@0: 	} else {
nuclear@0: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glTexImage2D(GL_TEXTURE_2D, 0, intfmt, tex_width, tex_height, 0, pixfmt, pixtype, 0);
nuclear@0: 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, pixfmt, pixtype, img.pixels);
nuclear@0: 
nuclear@0: 	tmat.scaling((float)width / (float)tex_width, (float)height / (float)tex_height, 1);
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: const Mat4 &Texture::texture_matrix() const
nuclear@0: {
nuclear@0: 	return tmat;
nuclear@0: }
nuclear@0: 
nuclear@0: void Texture::bind(bool loadmat) const
nuclear@0: {
nuclear@0: 	if(!tex) return;
nuclear@0: 
nuclear@0: 	if(loadmat) {
nuclear@0: 		glMatrixMode(GL_TEXTURE);
nuclear@0: 		glLoadMatrixf(tmat[0]);
nuclear@0: 		glMatrixMode(GL_MODELVIEW);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0: }