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/*
* The ManaPlus Client
* Copyright (C) 2014-2015 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* This program 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 2 of the License, or
* any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "render/shaders/shadersmanager.h"
#ifdef USE_OPENGL
#include "configuration.h"
#include "logger.h"
#include "render/mgl.h"
#include "render/shaders/shader.h"
#include "render/shaders/shaderprogram.h"
#include "resources/resourcemanager.h"
#include "utils/files.h"
#include "debug.h"
ShadersManager shaders;
Shader *ShadersManager::createShader(const unsigned int type,
const std::string &fileName)
{
const std::string str = Files::loadTextFileString(fileName);
const char *ptrStr = str.c_str();
GLuint shaderId = mglCreateShader(type);
mglShaderSource(shaderId, 1, &ptrStr, nullptr);
mglCompileShader(shaderId);
GLint isCompiled = 0;
mglGetShaderiv(shaderId, GL_COMPILE_STATUS, &isCompiled);
if (isCompiled == GL_TRUE)
return new Shader(shaderId);
GLint len = 0;
mglGetShaderiv(shaderId, GL_INFO_LOG_LENGTH, &len);
char *buf = new char[static_cast<size_t>(len) + 1];
mglGetShaderInfoLog(shaderId, len, &len, buf);
buf[len] = 0;
logger->log("Shader '%s' compilation error: %s", fileName.c_str(), buf);
delete [] buf;
mglDeleteShader(shaderId);
return nullptr;
}
ShaderProgram *ShadersManager::createProgram(const std::string &vertex,
const std::string &fragment)
{
ResourceManager *const resman = ResourceManager::getInstance();
Shader *const vertexShader = static_cast<Shader*>(
resman->getShader(GL_VERTEX_SHADER, vertex));
if (!vertexShader)
return nullptr;
Shader *const fragmentShader = static_cast<Shader*>(
resman->getShader(GL_FRAGMENT_SHADER, fragment));
if (!fragmentShader)
{
vertexShader->decRef();
return nullptr;
}
GLuint programId = mglCreateProgram();
if (!programId)
{
vertexShader->decRef();
fragmentShader->decRef();
return nullptr;
}
mglAttachShader(programId, vertexShader->getShaderId());
mglAttachShader(programId, fragmentShader->getShaderId());
mglBindFragDataLocation(programId, 0, "outColor");
mglLinkProgram(programId);
GLint isLinked = 0;
mglGetProgramiv(programId, GL_LINK_STATUS, &isLinked);
if (isLinked == GL_TRUE)
{
mglValidateProgram(programId);
GLint isValidated = 0;
mglGetProgramiv(programId, GL_VALIDATE_STATUS, &isValidated);
if (isValidated == GL_TRUE)
return new ShaderProgram(programId, vertexShader, fragmentShader);
mglDeleteProgram(programId);
return nullptr;
}
GLint len = 0;
mglGetProgramiv(programId, GL_INFO_LOG_LENGTH, &len);
char *buf = new char[static_cast<size_t>(len) + 1];
mglGetProgramInfoLog(programId, len, &len, buf);
buf[len] = 0;
logger->log("Program '%s, %s' compilation error: %s",
vertexShader->getIdPath().c_str(),
fragmentShader->getIdPath().c_str(),
buf);
delete [] buf;
mglDeleteProgram(programId);
return nullptr;
}
ShaderProgram *ShadersManager::getSimpleProgram()
{
const std::string dir = paths.getStringValue("shaders");
return createProgram(dir + paths.getStringValue("simpleVertexShader"),
dir + paths.getStringValue("simpleFragmentShader"));
}
#endif
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