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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "Rendering/GL/myGL.h"
#include "Rendering/Shaders/ShaderHandler.h"
#include "Rendering/Shaders/Shader.h"
#include "Rendering/GlobalRendering.h"
#include "System/Log/ILog.h"
#include "System/StringUtil.h"
#include <cassert>
// not extern'ed, so static
static CShaderHandler* gShaderHandler = nullptr;
static unsigned int gNumInstances = 0;
CShaderHandler* CShaderHandler::GetInstance(unsigned int instanceValue) {
assert(instanceValue <= 1);
if (gShaderHandler == nullptr) {
gShaderHandler = new CShaderHandler();
gNumInstances *= instanceValue;
gNumInstances += 1;
}
// nobody should bring us back to life after FreeInstance
// (unless n==0, which indicates we have just [re]loaded)
assert(gNumInstances <= 1);
return gShaderHandler;
}
void CShaderHandler::FreeInstance(CShaderHandler* sh) {
assert(sh == gShaderHandler);
delete sh;
gShaderHandler = nullptr;
}
CShaderHandler::~CShaderHandler() {
for (auto it = programObjects.begin(); it != programObjects.end(); ++it) {
// release by poMap (not poClass) to avoid erase-while-iterating pattern
ReleaseProgramObjectsMap(it->second);
}
programObjects.clear();
shaderCache.Clear();
}
void CShaderHandler::ReloadAll() {
for (auto it = programObjects.cbegin(); it != programObjects.cend(); ++it) {
for (auto jt = it->second.cbegin(); jt != it->second.cend(); ++jt) {
(jt->second)->Reload(true, true);
}
}
}
bool CShaderHandler::ReleaseProgramObjects(const std::string& poClass) {
if (programObjects.find(poClass) == programObjects.end())
return false;
ReleaseProgramObjectsMap(programObjects[poClass]);
programObjects.erase(poClass);
return true;
}
void CShaderHandler::ReleaseProgramObjectsMap(ProgramObjMap& poMap) {
for (auto it = poMap.cbegin(); it != poMap.cend(); ++it) {
Shader::IProgramObject* po = it->second;
// free the program object and its attachments
if (po != Shader::nullProgramObject) {
po->Release(); delete po;
}
}
poMap.clear();
}
Shader::IProgramObject* CShaderHandler::GetProgramObject(const std::string& poClass, const std::string& poName) {
if (programObjects.find(poClass) == programObjects.end())
return nullptr;
if (programObjects[poClass].find(poName) == programObjects[poClass].end())
return nullptr;
return (programObjects[poClass][poName]);
}
Shader::IProgramObject* CShaderHandler::CreateProgramObject(const std::string& poClass, const std::string& poName, bool arbProgram) {
Shader::IProgramObject* po = Shader::nullProgramObject;
const char* poType = arbProgram? "ARB": "GLSL";
if (programObjects.find(poClass) != programObjects.end()) {
if (programObjects[poClass].find(poName) != programObjects[poClass].end()) {
LOG_L(L_WARNING, "[SH::%s] program-object \"%s\" already exists", __func__, poName.c_str());
return (programObjects[poClass][poName]);
}
} else {
programObjects[poClass] = ProgramObjMap();
}
if (arbProgram) {
if (globalRendering->haveARB)
po = new Shader::ARBProgramObject(poName);
} else {
if (globalRendering->haveGLSL)
po = new Shader::GLSLProgramObject(poName);
}
if (po == Shader::nullProgramObject)
LOG_L(L_ERROR, "[SH::%s] hardware does not support creating (%s) program-object \"%s\"", __func__, poType, poName.c_str());
programObjects[poClass][poName] = po;
return po;
}
Shader::IShaderObject* CShaderHandler::CreateShaderObject(const std::string& soName, const std::string& soDefs, int soType) {
assert(!soName.empty());
Shader::IShaderObject* so = Shader::nullShaderObject;
switch (soType) {
case GL_VERTEX_PROGRAM_ARB:
case GL_FRAGMENT_PROGRAM_ARB: {
// assert(StringToLower(soName).find("arb") != std::string::npos);
if (globalRendering->haveARB)
so = new Shader::ARBShaderObject(soType, soName);
} break;
default: {
// assume GLSL shaders by default
// assert(StringToLower(soName).find("arb") == std::string::npos);
if (globalRendering->haveGLSL)
so = new Shader::GLSLShaderObject(soType, soName, soDefs);
} break;
}
if (so == Shader::nullShaderObject) {
LOG_L(L_ERROR, "[SH::%s] hardware does not support creating shader-object \"%s\"", __func__, soName.c_str());
return so;
}
return so;
}
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