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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "OGLShader.h"
#include "ShaderRegistry.h"
#include "../base/Logger.h"
#include "../base/Exception.h"
#include "../base/OSHelper.h"
#include "../graphics/VertexArray.h"
#include <iostream>
#include <sstream>
using namespace std;
namespace avg {
OGLShader::OGLShader(const string& sName, const string& sVertProgram,
const string& sFragProgram, const string& sVertPrefix, const string& sFragPrefix)
: m_sName(sName),
m_sVertProgram(sVertProgram),
m_sFragProgram(sFragProgram)
{
m_hProgram = glproc::CreateProgram();
if (sVertProgram == "") {
m_hVertexShader = 0;
} else {
glproc::BindAttribLocation(m_hProgram, VertexArray::TEX_INDEX, "a_TexCoord");
glproc::BindAttribLocation(m_hProgram, VertexArray::COLOR_INDEX, "a_Color");
glproc::BindAttribLocation(m_hProgram, VertexArray::POS_INDEX, "a_Pos");
m_hVertexShader = compileShader(GL_VERTEX_SHADER, sVertProgram, sVertPrefix);
glproc::AttachShader(m_hProgram, m_hVertexShader);
}
m_hFragmentShader = compileShader(GL_FRAGMENT_SHADER, sFragProgram, sFragPrefix);
glproc::AttachShader(m_hProgram, m_hFragmentShader);
glproc::LinkProgram(m_hProgram);
GLContext::checkError("OGLShader::OGLShader: glLinkProgram()");
GLint bLinked;
glproc::GetProgramiv(m_hProgram, GL_LINK_STATUS, &bLinked);
if (!bLinked) {
AVG_LOG_ERROR("Linking shader program '"+sName+"' failed. Aborting.");
dumpInfoLog(m_hVertexShader, Logger::severity::ERROR);
dumpInfoLog(m_hFragmentShader, Logger::severity::ERROR);
dumpInfoLog(m_hProgram, Logger::severity::ERROR, true);
exit(-1);
} else {
AVG_TRACE(Logger::category::SHADER, Logger::severity::INFO,
"Linking shader program '"+sName+"'.");
dumpInfoLog(m_hVertexShader, Logger::severity::INFO);
dumpInfoLog(m_hFragmentShader, Logger::severity::INFO);
dumpInfoLog(m_hProgram, Logger::severity::INFO, true);
}
m_pShaderRegistry = &*ShaderRegistry::get();
if (m_hVertexShader) {
m_pTransformParam = getParam<glm::mat4>("transform");
}
}
OGLShader::~OGLShader()
{
}
bool isMountainLion()
{
#ifdef __APPLE__
return getOSXMajorVersion() >= 12;
#else
return false;
#endif
}
void OGLShader::activate()
{
// If we're running on OS X mountain lion, we need to disable shader activation
// caching (See bug #355).
OGLShaderPtr pCurShader = m_pShaderRegistry->getCurShader();
if (isMountainLion() || !pCurShader || &*pCurShader != this) {
glproc::UseProgram(m_hProgram);
m_pShaderRegistry->setCurShader(m_sName);
GLContext::checkError("OGLShader::activate: glUseProgram()");
}
}
GLuint OGLShader::getProgram()
{
return m_hProgram;
}
const std::string OGLShader::getName() const
{
return m_sName;
}
void OGLShader::setTransform(const glm::mat4& transform)
{
if (m_hVertexShader) {
m_pTransformParam->set(transform);
} else {
#ifdef AVG_ENABLE_EGL
// No fixed-function vertex shader in gles
AVG_ASSERT(false);
#else
glLoadMatrixf(glm::value_ptr(transform));
#endif
}
}
GLuint OGLShader::compileShader(GLenum shaderType, const std::string& sProgram,
const std::string& sPrefix)
{
const char * pProgramStrs[2];
pProgramStrs[0] = sPrefix.c_str();
pProgramStrs[1] = sProgram.c_str();
GLuint hShader = glproc::CreateShader(shaderType);
glproc::ShaderSource(hShader, 2, pProgramStrs, 0);
glproc::CompileShader(hShader);
GLContext::checkError("OGLShader::compileShader()");
return hShader;
}
bool OGLShader::findParam(const std::string& sName, unsigned& pos)
{
GLShaderParamPtr pParam;
bool bFound = false;
pos = 0;
while (!bFound && pos<m_pParams.size() && m_pParams[pos]->getName() <= sName) {
if (m_pParams[pos]->getName() == sName) {
bFound = true;
} else {
++pos;
}
}
return bFound;
}
void OGLShader::dumpInfoLog(GLuint hObj, long level, bool bIsProgram)
{
int infoLogLength;
GLchar * pInfoLog;
if (!hObj) {
return;
}
if (bIsProgram) {
glproc::GetProgramiv(hObj, GL_INFO_LOG_LENGTH, &infoLogLength);
} else {
glproc::GetShaderiv(hObj, GL_INFO_LOG_LENGTH, &infoLogLength);
}
GLContext::checkError("OGLShader::dumpInfoLog: glGetShaderiv()");
if (infoLogLength > 1) {
pInfoLog = (GLchar*)malloc(infoLogLength);
int charsWritten;
if (bIsProgram) {
glproc::GetProgramInfoLog(hObj, infoLogLength, &charsWritten, pInfoLog);
} else {
glproc::GetShaderInfoLog(hObj, infoLogLength, &charsWritten, pInfoLog);
}
string sLog = removeATIInfoLogSpam(pInfoLog);
GLContext::checkError("OGLShader::dumpInfoLog: glGetShaderInfoLog()");
if (sLog.size() > 3) {
AVG_TRACE(Logger::category::SHADER, level, sLog);
}
free(pInfoLog);
}
}
string OGLShader::removeATIInfoLogSpam(const string& sOrigLog)
{
istringstream stream(sOrigLog);
string sLog;
string sCurLine;
while(getline(stream, sCurLine)) {
bool bLineBroken = (sCurLine.find(
"shader was successfully compiled to run on hardware.") != string::npos)
|| (sCurLine.find("shader(s) linked.") != string::npos);
if (!bLineBroken) {
sLog.append(sCurLine+"\n");
}
}
return sLog;
}
}
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