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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2008 Martiño Figueroa
//
// You can redistribute this code 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 (at your option) any later version
// ==============================================================
#include "opengl.h"
#include <stdexcept>
#include "graphics_interface.h"
#include "context_gl.h"
#include "gl_wrap.h"
#include <map>
#include "util.h"
#include "leak_dumper.h"
using namespace Shared::Platform;
using namespace Shared::Util;
using namespace std;
namespace Shared { namespace Graphics { namespace Gl {
std::map<string,bool> cacheExtensionCheckList;
static int vboEnabled = 0;
// =====================================================
// class Globals
// =====================================================
bool getVBOSupported() {
if(vboEnabled == 0) {
bool value = isGlExtensionSupported("GL_ARB_vertex_buffer_object");
vboEnabled = (value == true ? 1 : -1);
}
return (vboEnabled == 1);
}
void setVBOSupported(bool value) {
vboEnabled = (value == true ? 1 : -1);
};
void overrideGlExtensionSupport(const char *extensionName,bool value) {
cacheExtensionCheckList[extensionName]=value;
if(SystemFlags::VERBOSE_MODE_ENABLED) printf("OpenGL Extension [%s] supported status FORCED TO = %d\n",extensionName,cacheExtensionCheckList[extensionName]);
}
bool isGlExtensionSupported(const char *extensionName) {
if(cacheExtensionCheckList.find(extensionName) != cacheExtensionCheckList.end()) {
return cacheExtensionCheckList[extensionName];
}
const GLubyte *extensionStr= glGetString(GL_EXTENSIONS);
const char *s= reinterpret_cast<const char *>(extensionStr);
size_t len= strlen(extensionName);
cacheExtensionCheckList[extensionName]=false;
if(s != NULL) {
while ((s = strstr (s, extensionName)) != NULL) {
s+= len;
if((*s == ' ') || (*s == '\0')) {
cacheExtensionCheckList[extensionName] = true;
break;
}
}
}
if(SystemFlags::VERBOSE_MODE_ENABLED) printf("OpenGL Extension [%s] supported status = %d\n",extensionName,cacheExtensionCheckList[extensionName]);
return cacheExtensionCheckList[extensionName];
}
//bool isGlVersionSupported(int major, int minor, int release) {
//
// const char *strVersion= getGlVersion();
//
// //major
// const char *majorTok= strVersion;
// int majorSupported= atoi(majorTok);
//
// if(majorSupported<major) {
// return false;
// }
// else if(majorSupported>major) {
// return true;
// }
//
// //minor
// int i=0;
// while(strVersion[i]!='.') {
// ++i;
// }
// const char *minorTok= &strVersion[i]+1;
// int minorSupported= atoi(minorTok);
//
// if(minorSupported<minor) {
// return false;
// }
// else if(minorSupported>minor) {
// return true;
// }
//
// //release
// ++i;
// while(strVersion[i]!='.') {
// ++i;
// }
// const char *releaseTok= &strVersion[i]+1;
//
// if(atoi(releaseTok) < release) {
// return false;
// }
//
// return true;
//}
const char *getGlVersion() {
return reinterpret_cast<const char *>(glGetString(GL_VERSION));
}
const char *getGlRenderer() {
return reinterpret_cast<const char *>(glGetString(GL_RENDERER));
}
const char *getGlVendor() {
return reinterpret_cast<const char *>(glGetString(GL_VENDOR));
}
const char *getGlExtensions() {
return reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));
}
const char *getGlPlatformExtensions() {
Context *c= GraphicsInterface::getInstance().getCurrentContext();
return getPlatformExtensions(static_cast<ContextGl*>(c)->getPlatformContextGl());
}
int getGlMaxLights() {
int i;
glGetIntegerv(GL_MAX_LIGHTS, (GLint*)&i);
return i;
}
int getGlMaxTextureSize() {
int i;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, (GLint*)&i);
return i;
}
int getGlMaxTextureUnits() {
int i;
glGetIntegerv(GL_MAX_TEXTURE_UNITS, (GLint*)&i);
return i;
}
int getGlModelviewMatrixStackDepth() {
int i;
glGetIntegerv(GL_MAX_MODELVIEW_STACK_DEPTH, (GLint*)&i);
return i;
}
int getGlProjectionMatrixStackDepth() {
int i;
glGetIntegerv(GL_MAX_PROJECTION_STACK_DEPTH, (GLint*)&i);
return i;
}
void checkGlExtension(const char *extensionName) {
if(!isGlExtensionSupported(extensionName)){
throw megaglest_runtime_error("OpenGL extension not supported: " + string(extensionName));
}
}
}}}// end namespace
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