nuclear@1: #include "opengl.h"
nuclear@1: #include "texture.h"
nuclear@1: 
nuclear@1: void bind_texture(const Texture *tex, int texunit)
nuclear@1: {
nuclear@1: 	static const Texture *curr_tex[8];
nuclear@1: 
nuclear@1: 	if(tex == curr_tex[texunit]) {
nuclear@1: 		return;
nuclear@1: 	}
nuclear@1: 
nuclear@1: 	glActiveTexture(GL_TEXTURE0 + texunit);
nuclear@1: 	if(tex) {
nuclear@1: 		glEnable(tex->type);
nuclear@1: 		glBindTexture(tex->type, tex->tex);
nuclear@1: 	} else {
nuclear@1: 		glDisable(tex->type);
nuclear@1: 	}
nuclear@1: 	glActiveTexture(GL_TEXTURE0);
nuclear@1: 
nuclear@1: 	curr_tex[texunit] = tex;
nuclear@1: }
nuclear@1: 
nuclear@1: 
nuclear@1: Texture::Texture()
nuclear@1: {
nuclear@1: 	type = 0;
nuclear@1: 
nuclear@1: 	size[0] = size[1] = size[2] = 0;
nuclear@1: 
nuclear@1: 	glGenTextures(1, &tex);
nuclear@1: }
nuclear@1: 
nuclear@1: Texture::~Texture()
nuclear@1: {
nuclear@1: 	if(tex) {
nuclear@1: 		glDeleteTextures(1, &tex);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: int Texture::get_size(int idx) const
nuclear@1: {
nuclear@1: 	return idx >= 0 && idx < 3 ? size[idx] : 0;
nuclear@1: }
nuclear@1: 
nuclear@1: Texture2D::Texture2D()
nuclear@1: {
nuclear@1: 	type = GL_TEXTURE_2D;
nuclear@1: 
nuclear@1: 	glBindTexture(type, tex);
nuclear@1: 	glTexParameteri(type, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@1: 	glTexParameteri(type, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@1: }
nuclear@1: 
nuclear@1: void Texture2D::create(int xsz, int ysz, float *data)
nuclear@1: {
nuclear@1: 	glBindTexture(type, tex);
nuclear@1: 	glTexImage2D(type, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_FLOAT, data);
nuclear@1: 
nuclear@1: 	size[0] = xsz;
nuclear@1: 	size[1] = ysz;
nuclear@1: }
nuclear@1: 
nuclear@1: Texture3D::Texture3D()
nuclear@1: {
nuclear@1: 	type = GL_TEXTURE_3D;
nuclear@1: 
nuclear@1: 	glBindTexture(type, tex);
nuclear@1: 	glTexParameteri(type, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@1: 	glTexParameteri(type, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@1: }
nuclear@1: 
nuclear@1: void Texture3D::create(int xsz, int ysz, int zsz, float *data)
nuclear@1: {
nuclear@1: 	glBindTexture(type, tex);
nuclear@1: 	glTexImage3D(type, 0, GL_RGBA, xsz, ysz, zsz, 0, GL_RGBA, GL_FLOAT, data);
nuclear@1: 
nuclear@1: 	size[0] = xsz;
nuclear@1: 	size[1] = ysz;
nuclear@1: 	size[2] = zsz;
nuclear@1: }