/*
 Copyright (c) 2013 yvt
 
 This file is part of OpenSpades.
 
 OpenSpades 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.
 
 OpenSpades 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 OpenSpades.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#include "GLShadowMapShader.h"
#include "GLRenderer.h"
#include "GLProgramManager.h"
#include "GLMapShadowRenderer.h"
#include "../Core/Settings.h"
#include "GLBasicShadowMapRenderer.h"
#include "GLSparseShadowMapRenderer.h"
#include "../Core/Debug.h"

SPADES_SETTING(r_modelShadows, "1");
SPADES_SETTING(r_sparseShadowMaps, "1");

namespace spades {
	namespace draw {
		GLShadowMapShader::GLShadowMapShader():
		projectionViewMatrix("projectionViewMatrix")
		{}
		
		std::vector<GLShader *> GLShadowMapShader::RegisterShader(spades::draw::GLProgramManager *r) {
			SPADES_MARK_FUNCTION();
			std::vector<GLShader *>  shaders;
			
			// even there is no dynamic shadow,
			// this is still needed to avoid error...
			
			shaders.push_back(r->RegisterShader("Shaders/ShadowMap/Common.fs"));
			shaders.push_back(r->RegisterShader("Shaders/ShadowMap/Common.vs"));
			
			shaders.push_back(r->RegisterShader("Shaders/ShadowMap/Basic.fs"));
			shaders.push_back(r->RegisterShader("Shaders/ShadowMap/Basic.vs"));
			
			return shaders;
		}
		
		IGLShadowMapRenderer * GLShadowMapShader::CreateShadowMapRenderer(spades::draw::GLRenderer *r){
			SPADES_MARK_FUNCTION();
			if(!r_modelShadows)
				return NULL;
			if(r_sparseShadowMaps)
				return new GLSparseShadowMapRenderer(r);
			return new GLBasicShadowMapRenderer(r);
		}
		
		int GLShadowMapShader::operator()(GLRenderer *renderer,
									   spades::draw::GLProgram *program, int texStage) {
			
			
			IGLDevice *dev = program->GetDevice();
			
			if(r_sparseShadowMaps){
				GLSparseShadowMapRenderer *r = static_cast<GLSparseShadowMapRenderer *>(renderer->GetShadowMapRenderer());
				
				projectionViewMatrix(program);
				projectionViewMatrix.SetValue(r->matrix);
			}else{
				GLBasicShadowMapRenderer *r = static_cast<GLBasicShadowMapRenderer *>(renderer->GetShadowMapRenderer());
				
				projectionViewMatrix(program);
				projectionViewMatrix.SetValue(r->matrix);
			}
			
			dev->ActiveTexture(texStage);
			
			return texStage;
		}
	}
}