shaderrenderable.cpp

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/* xoreos - A reimplementation of BioWare's Aurora engine
 *
 * xoreos is the legal property of its developers, whose names
 * can be found in the AUTHORS file distributed with this source
 * distribution.
 *
 * xoreos is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * xoreos is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with xoreos. If not, see <http://www.gnu.org/licenses/>.
 */

#include "glm/gtc/type_ptr.hpp"

#include "src/graphics/shader/shaderrenderable.h"

namespace Graphics {

namespace Shader {

ShaderRenderable::ShaderRenderable() : _surface(0), _material(0), _program(0), _mesh(0) {
}

ShaderRenderable::ShaderRenderable(Shader::ShaderSurface *surface, Shader::ShaderMaterial *material, Mesh::Mesh *mesh) : _surface(surface), _material(material), _program(0), _mesh(mesh) {
    //_program = ShaderMan.getShaderProgram(_surface->getVertexShader(), _material->getFragmentShader());
    _surface->useIncrement();
    _material->useIncrement();
    _mesh->useIncrement();
    updateProgram();
}

ShaderRenderable::ShaderRenderable(Shader::ShaderRenderable *src) : _surface(0), _material(0), _program(0), _mesh(0) {
    if (src) {
        setSurface(src->_surface, false);
        setMaterial(src->_material, false);
        setMesh(src->_mesh);
        updateProgram();
    }
}

ShaderRenderable::ShaderRenderable(const Shader::ShaderRenderable &src) : _surface(src._surface), _material(src._material), _program(src._program), _mesh(src._mesh) {
    if (_surface) {
        _surface->useIncrement();
    }
    if (_material) {
        _material->useIncrement();
    }
    if (_mesh) {
        _mesh->useIncrement();
    }
}

const ShaderRenderable &ShaderRenderable::operator=(const Shader::ShaderRenderable &src) {
    setSurface(src._surface, false);
    setMaterial(src._material, false);
    setMesh(src._mesh);
    _program = src._program;
    return *this;
}

ShaderRenderable::~ShaderRenderable() {
    if (_surface) {
        _surface->useDecrement();
    }
    if (_material) {
        _material->useDecrement();
    }
    if (_mesh) {
        _mesh->useDecrement();
    }
}

ShaderSurface *ShaderRenderable::getSurface() {
    return _surface;
}

ShaderMaterial *ShaderRenderable::getMaterial() {
    return _material;
}

ShaderProgram *ShaderRenderable::getProgram() {
    return _program;
}

Mesh::Mesh *ShaderRenderable::getMesh() {
    return _mesh;
}

void ShaderRenderable::setSurface(Shader::ShaderSurface *surface, bool rebuildProgram) {
    // TODO: check old surface for usage count decrement.
    if (_surface) {
        _surface->useDecrement();
    }
    _surface = surface;
    if (_surface) {
        _surface->useIncrement();
    }
    if (rebuildProgram) {
        updateProgram();
    }
}

void ShaderRenderable::setMaterial(Shader::ShaderMaterial *material, bool rebuildProgram) {
    if (_material) {
        _material->useDecrement();
    }
    _material = material;
    if (_material) {
        _material->useIncrement();
    }
    if (rebuildProgram) {
        updateProgram();
    }
}

void ShaderRenderable::setMesh(Mesh::Mesh *mesh) {
    if (_mesh) {
        _mesh->useDecrement();
    }
    _mesh = mesh;
    if (_mesh) {
        _mesh->useIncrement();
    }
}

void ShaderRenderable::copyRenderable(ShaderRenderable *src) {
    if (src) {
        setSurface(src->getSurface(), false);
        setMaterial(src->getMaterial(), false);
        setMesh(src->getMesh());
    } else {
        setSurface(0, false);
        setMaterial(0, false);
        setMesh(0);
    }
    updateProgram();
}

void ShaderRenderable::renderImmediate(const glm::mat4 &tform, float alpha) {
    if (!_program->glid)
        return;
    glUseProgram(_program->glid);
    _material->bindProgram(_program, alpha);
    _material->bindGLState();
    _surface->bindProgram(_program, &tform);
    _surface->bindGLState();

    _mesh->renderImmediate();

    _surface->unbindGLState();
    _material->unbindGLState();
    glUseProgram(0);
}

void ShaderRenderable::updateProgram() {
    if ((_surface != 0) && (_material != 0)) {
        ShaderMan.registerShaderProgram(_surface->getVertexShader(), _material->getFragmentShader());
        _program = ShaderMan.getShaderProgram(_surface->getVertexShader(), _material->getFragmentShader());
    } else {
        _program = 0;
    }
}

} // End of namespace Shader

} // End of namespace Graphics