nuclear@72: #include <stdio.h>
nuclear@72: #include "opengl.h"
nuclear@72: #include "colgrade.h"
nuclear@72: 
nuclear@72: GradePalette::GradePalette()
nuclear@72: {
nuclear@72: 	tex = 0;
nuclear@72: }
nuclear@72: 
nuclear@72: GradePalette::~GradePalette()
nuclear@72: {
nuclear@72: 	destroy();
nuclear@72: }
nuclear@72: 
nuclear@72: bool GradePalette::create(int sz)
nuclear@72: {
nuclear@72: 	unsigned int clamp = GLEW_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
nuclear@72: 
nuclear@72: 	destroy();
nuclear@72: 
nuclear@72: 	glGenTextures(1, &tex);
nuclear@72: 	glBindTexture(GL_TEXTURE_3D, tex);
nuclear@72: 	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@72: 	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@72: 	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, clamp);
nuclear@72: 	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, clamp);
nuclear@72: 	glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, clamp);
nuclear@72: 	glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, sz, sz, sz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
nuclear@72: 
nuclear@72: 	unsigned char *scanline = new unsigned char[sz * 3];
nuclear@72: 
nuclear@72: 	size = sz;
nuclear@72: 	for(int i=0; i<sz; i++) {	// for each slice...
nuclear@72: 		int b = 255 * i / (sz - 1);
nuclear@72: 		for(int j=0; j<sz; j++) {	// for each scanline...
nuclear@72: 			int g = 255 * j / (sz - 1);
nuclear@72: 
nuclear@72: 			for(int k=0; k<sz; k++) {
nuclear@72: 				int r = 255 * k / (sz - 1);
nuclear@72: 
nuclear@72: 				scanline[k * 3] = r;
nuclear@72: 				scanline[k * 3 + 1] = g;
nuclear@72: 				scanline[k * 3 + 2] = b;
nuclear@72: 			}
nuclear@72: 			glTexSubImage3D(GL_TEXTURE_3D, 0, 0, j, i, sz, 1, 1, GL_RGB,
nuclear@72: 					GL_UNSIGNED_BYTE, scanline);
nuclear@72: 		}
nuclear@72: 	}
nuclear@72: 
nuclear@72: 	delete [] scanline;
nuclear@72: 	return true;
nuclear@72: }
nuclear@72: 
nuclear@72: void GradePalette::destroy()
nuclear@72: {
nuclear@72: 	if(tex) {
nuclear@72: 		glDeleteTextures(1, &tex);
nuclear@72: 	}
nuclear@72: }
nuclear@72: 
nuclear@72: bool GradePalette::save_shot(const char *fname) const
nuclear@72: {
nuclear@72: 	return false;	// TODO
nuclear@72: }
nuclear@72: 
nuclear@72: bool GradePalette::load_shot(const char *fname)
nuclear@72: {
nuclear@72: 	return false;	// TODO
nuclear@72: }
nuclear@72: 
nuclear@72: unsigned int GradePalette::get_texture() const
nuclear@72: {
nuclear@72: 	return tex;
nuclear@72: }