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/*
render/state.cc
This file is part of the Osirion project and is distributed under
the terms of the GNU General Public License version 2
*/
#include <string>
#include <sstream>
#include "SDL/SDL.h"
#include "render/state.h"
#include "render/gl.h"
#include "render/render.h"
namespace render
{
int State::render_width = 0;
int State::render_height = 0;
float State::render_aspect = 0;
bool State::render_has_generate_mipmaps = false;
bool State::render_has_vbo = false;
GLuint State::render_vbo = 0;
void State::init(int width, int height)
{
resize(width, height);
render_has_generate_mipmaps = false;
std::string version(gl::version());
for (size_t i = 0; i < version.size(); i++) {
if (version[i] == '.')
version[i] = ' ';
}
std::stringstream versionstream(version);
int major, minor;
if (versionstream >> major >> minor) {
if (major > 1) {
render_has_generate_mipmaps = true;
} else if (major == 1) {
if (minor > 3)
render_has_generate_mipmaps = true;
}
} else {
con_warn << "Could not determine OpenGL version!" << std::endl;
}
con_print << " hardware generated mipmaps ";
if (render_has_generate_mipmaps)
con_print << "available" << std::endl;
else
con_print << "not available" << std::endl;
// initialize gl functions
render_has_vbo = true;
gl::genbuffers = (gl::genbuffers_func) SDL_GL_GetProcAddress("glGenBuffers");
if (!gl::genbuffers) {
con_debug << " glGenBuffers not available" << std::endl;
render_has_vbo = false;
}
gl::deletebuffers = (gl::deletebuffers_func) SDL_GL_GetProcAddress("glDeleteBuffers");
if (!gl::deletebuffers) {
con_debug << " glDeleteBuffers not available" << std::endl;
render_has_vbo = false;
}
gl::bindbuffer = (gl::bindbuffer_func) SDL_GL_GetProcAddress("glBindBuffer");
if (!gl::bindbuffer) {
con_debug << " glBindBuffer not available" << std::endl;
render_has_vbo = false;
}
gl::bufferdata = (gl::bufferdata_func) SDL_GL_GetProcAddress("glBufferData");
if (!gl::bufferdata) {
con_debug << " glBufferData not available" << std::endl;
render_has_vbo = false;
}
con_print << " vertex bufer objects ";
if (render_has_vbo)
con_print << "enabled" << std::endl;
else
con_print << "disabled" << std::endl;
// Generate VBO
if (render_has_vbo)
gl::genbuffers(1, &render_vbo);
}
void State::shutdown()
{
// Delete VBO
if (render_has_vbo)
gl::deletebuffers(1, &render_vbo);
}
void State::resize(int width, int height)
{
render_width = width;
render_height = height;
render_aspect = (float) width / (float) height;
clear();
}
void State::clear()
{
// set viewport
gl::viewport(0, 0, render_width, render_height);
// set clear color
gl::clearcolor(0.0f, 0.0f, 0.0f, 1.0f);
// load identity matrices
gl::matrixmode(GL_PROJECTION);
gl::loadidentity();
gl::matrixmode(GL_MODELVIEW);
gl::loadidentity();
// shading model: Gouraud (smooth, the default)
gl::shademodel(GL_SMOOTH);
//gl::shademodel(GL_FLAT);
// color tracking
glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
// material settings
GLfloat specular_reflectance[] = { 0.2f, 0.2f, 0.2f, 1.0f };
glMaterialfv(GL_FRONT, GL_SPECULAR, specular_reflectance);
glMateriali(GL_FRONT, GL_SHININESS, 128); // shininess 1-128
// alpha blending function
gl::blendfunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
gl::disable(GL_LIGHTING);
gl::disable(GL_COLOR_MATERIAL);
gl::cullface(GL_BACK);
gl::frontface(GL_CCW);
gl::disable(GL_CULL_FACE);
gl::disable(GL_DEPTH_TEST);
gl::disable(GL_BLEND);
gl::disable(GL_TEXTURE_2D);
}
void State::set_normalize(const bool enable)
{
if (r_normalize && r_normalize->value()) {
// enable full normalization
if(enable) {
gl::enable(GL_NORMALIZE);
} else {
gl::disable(GL_NORMALIZE);
}
} else {
// enable rescaling of normals
if(enable) {
gl::enable(GL_RESCALE_NORMAL);
} else {
gl::disable(GL_RESCALE_NORMAL);
}
}
}
} // namespace render
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