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preparation to replace glew by glad

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This commit is contained in:
Erwin Coumans
2018-02-20 19:44:02 -08:00
parent 8bb40b632b
commit b0984de046
21 changed files with 151 additions and 41375 deletions
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18
build3/findOpenGLGlewGlut.lua
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@@ -35,7 +35,7 @@
if _OPTIONS["enable_system_opengl"] and (os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h")) then if _OPTIONS["enable_system_opengl"] and (os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h")) then
links {"GL"} links {"GL"}
else else
print("No GL/gl.h found, using dynamic loading of GL using glew") print("No GL/gl.h found, using dynamic loading of GL using glad")
defines {"GLEW_INIT_OPENGL11_FUNCTIONS=1"} defines {"GLEW_INIT_OPENGL11_FUNCTIONS=1"}
links {"dl"} links {"dl"}
end end
@@ -50,24 +50,20 @@
configuration {"Windows"} configuration {"Windows"}
defines { "GLEW_STATIC"} defines { "GLEW_STATIC"}
includedirs { includedirs {
projectRootDir .. "examples/ThirdPartyLibs/Glew" projectRootDir .. "examples/ThirdPartyLibs/glad"
} }
files { projectRootDir .. "examples/ThirdPartyLibs/Glew/glew.c"} files { projectRootDir .. "examples/ThirdPartyLibs/glad/glad.c"}
end end
if os.is("Linux") then if os.is("Linux") then
configuration{"Linux"} configuration{"Linux"}
if _OPTIONS["enable_system_opengl"] and (os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h") and os.isfile("/usr/include/GL/glew.h")) then print("Using glad and dynamic loading of glx functions")
links {"GLEW"}
print ("linking against system GLEW")
else
print("Using static glew and dynamic loading of glx functions")
defines { "GLEW_STATIC","GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS=1"} defines { "GLEW_STATIC","GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS=1"}
includedirs { includedirs {
projectRootDir .. "examples/ThirdPartyLibs/Glew" projectRootDir .. "examples/ThirdPartyLibs/glad"
} }
files { projectRootDir .. "examples/ThirdPartyLibs/Glew/glew.c"} files { projectRootDir .. "examples/ThirdPartyLibs/glad/glad.c",
projectRootDir .. "examples/ThirdPartyLibs/glad/glad_glx.c"}
links {"dl"} links {"dl"}
end
end end
configuration{} configuration{}

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data/multibody.bullet
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2
examples/OpenGLWindow/GLInstancingRenderer.cpp
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@@ -33,7 +33,9 @@ float shadowMapWorldSize=10;
#else #else
#ifndef __APPLE__ #ifndef __APPLE__
#ifndef glVertexAttribDivisor #ifndef glVertexAttribDivisor
#ifndef NO_GLEW #ifndef NO_GLEW
#define glVertexAttribDivisor glVertexAttribDivisorARB #define glVertexAttribDivisor glVertexAttribDivisorARB
#endif //NO_GLEW #endif //NO_GLEW
#endif //glVertexAttribDivisor #endif //glVertexAttribDivisor

24
examples/OpenGLWindow/MacOpenGLWindowObjC.m
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@@ -170,17 +170,19 @@ void dumpInfo(void)
if (m_resizeCallback) if (m_resizeCallback)
{ {
(*m_resizeCallback)(width,height); (*m_resizeCallback)(width,height);
}
#ifndef NO_OPENGL3
NSRect backingBounds = [self convertRectToBacking:[self bounds]];
GLsizei backingPixelWidth = (GLsizei)(backingBounds.size.width),
backingPixelHeight = (GLsizei)(backingBounds.size.height);
// Set viewport #ifndef NO_OPENGL3
glViewport(0, 0, backingPixelWidth, backingPixelHeight); NSRect backingBounds = [self convertRectToBacking:[self bounds]];
#else GLsizei backingPixelWidth = (GLsizei)(backingBounds.size.width),
glViewport(0,0,(GLsizei)width,(GLsizei)height); backingPixelHeight = (GLsizei)(backingBounds.size.height);
// Set viewport
glViewport(0, 0, backingPixelWidth, backingPixelHeight);
#else
glViewport(0,0,(GLsizei)width,(GLsizei)height);
#endif #endif
}
} }
[m_context setView: self]; [m_context setView: self];
@@ -236,7 +238,7 @@ void dumpInfo(void)
[fmt release]; [fmt release];
[m_context makeCurrentContext]; [m_context makeCurrentContext];
checkError("makeCurrentContext"); //checkError("makeCurrentContext");
} }
-(void) MakeCurrent -(void) MakeCurrent
@@ -420,7 +422,7 @@ int Mac_createWindow(struct MacOpenGLWindowInternalData* m_internalData,struct M
// float newBackingScaleFactor = [m_internalData->m_window backingScaleFactor]; // float newBackingScaleFactor = [m_internalData->m_window backingScaleFactor];
dumpInfo(); //dumpInfo();

28
examples/OpenGLWindow/OpenGL2Include.h
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@@ -21,33 +21,7 @@ subject to the following restrictions:
#include "glad/glad.h" #include "glad/glad.h"
#include <GLFW/glfw3.h> #include <GLFW/glfw3.h>
#else #else
//think different #include "glad/glad.h"
#if defined(__APPLE__) && !defined (VMDMESA)
#include <OpenGL/OpenGL.h>
#include <OpenGL/gl.h>
#else
#ifdef GLEW_STATIC
#include "CustomGL/glew.h"
#else
#ifdef NO_GLEW
#define GL_GLEXT_LEGACY
#include "third_party/GL/gl/include/GL/gl.h"
#include "third_party/GL/gl/include/GL/glext.h"
#else
#include <GL/glew.h>
#endif //NO_GLEW
#endif //GLEW_STATIC
#ifdef _WINDOWS
#include <windows.h>
//#include <GL/gl.h>
//#include <GL/glu.h>
#else
//#include <GL/gl.h>
//#include <GL/glu.h>
#endif //_WINDOWS
#endif //APPLE
#endif //B3_USE_GLFW #endif //B3_USE_GLFW
//disable glGetError //disable glGetError
//#undef glGetError //#undef glGetError

52
examples/OpenGLWindow/OpenGLInclude.h
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@@ -21,56 +21,8 @@ subject to the following restrictions:
#include <glad/glad.h> #include <glad/glad.h>
#include <GLFW/glfw3.h> #include <GLFW/glfw3.h>
#else #else
//think different #include "glad/glad.h"
#if defined(__APPLE__) && !defined (VMDMESA) #endif //B3_USE_GLFW
#include <OpenGL/OpenGL.h>
//#include <OpenGL/gl.h>
//#include <OpenGL/glu.h>
//#import <Cocoa/Cocoa.h>
#if defined (USE_OPENGL2) || defined (NO_OPENGL3)
#include <OpenGL/gl.h>
#else
#include <OpenGL/gl3.h>
#endif
#else
#ifdef GLEW_STATIC
#include "CustomGL/glew.h"
#else
#ifdef NO_GLEW
#define GL_GLEXT_LEGACY
#include "third_party/GL/gl/include/GL/gl.h"
#include "third_party/GL/gl/include/GL/glext.h"
#else
#include <GL/glew.h>
#endif //NO_GLEW
#endif //GLEW_STATIC
#ifdef _WINDOWS
#include <windows.h>
//#include <GL/gl.h>
//#include <GL/glu.h>
#else
//#include <GL/gl.h>
//#include <GL/glu.h>
#endif //_WINDOWS
#endif //APPLE
#endif
//disable glGetError
//#undef glGetError
//#define glGetError MyGetError
//
//GLenum inline MyGetError()
//{
// return 0;
//}
///on Linux only glDrawElementsInstancedARB is defined?!?
//#ifdef __linux
//#define glDrawElementsInstanced glDrawElementsInstancedARB
//
//#endif //__linux
#endif //__OPENGL_INCLUDE_H #endif //__OPENGL_INCLUDE_H

10
examples/OpenGLWindow/SimpleOpenGL2App.cpp
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@@ -44,6 +44,8 @@ static SimpleOpenGL2App* gApp2=0;
static void Simple2ResizeCallback( float widthf, float heightf) static void Simple2ResizeCallback( float widthf, float heightf)
{ {
glViewport(0, 0, widthf, heightf);
int width = (int)widthf; int width = (int)widthf;
int height = (int)heightf; int height = (int)heightf;
if (gApp2->m_renderer && gApp2->m_window) if (gApp2->m_renderer && gApp2->m_window)
@@ -141,12 +143,15 @@ SimpleOpenGL2App::SimpleOpenGL2App(const char* title, int width, int height)
#ifndef _WIN32 #ifndef _WIN32
#ifndef B3_USE_GLFW #ifndef B3_USE_GLFW
//some Linux implementations need the 'glewExperimental' to be true //some Linux implementations need the 'glewExperimental' to be true
glewExperimental = GL_TRUE;
#endif//B3_USE_GLFW #endif//B3_USE_GLFW
#endif //_WIN32 #endif //_WIN32
#ifndef B3_USE_GLFW #ifndef B3_USE_GLFW
if (glewInit() != GLEW_OK) //gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
#if 0
if (glewInit() != GLEW_OK)
{ {
b3Error("glewInit failed"); b3Error("glewInit failed");
exit(1); exit(1);
@@ -156,6 +161,7 @@ SimpleOpenGL2App::SimpleOpenGL2App(const char* title, int width, int height)
b3Error("GLEW_VERSION_2_1 needs to support 2_1"); b3Error("GLEW_VERSION_2_1 needs to support 2_1");
exit(1); // or handle the error in a nicer way exit(1); // or handle the error in a nicer way
} }
#endif
#endif //B3_USE_GLFW #endif //B3_USE_GLFW
#endif //__APPLE__ #endif //__APPLE__
#endif //NO_GLEW #endif //NO_GLEW

27
examples/OpenGLWindow/SimpleOpenGL3App.cpp
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@@ -71,6 +71,8 @@ static SimpleOpenGL3App* gApp=0;
static void SimpleResizeCallback( float widthf, float heightf) static void SimpleResizeCallback( float widthf, float heightf)
{ {
int width = (int)widthf; int width = (int)widthf;
int height = (int)heightf; int height = (int)heightf;
if (gApp && gApp->m_instancingRenderer) if (gApp && gApp->m_instancingRenderer)
@@ -285,6 +287,14 @@ struct MyRenderCallbacks : public RenderCallbacks
} }
}; };
static void printGLString(const char *name, GLenum s) {
const char *v = (const char *) glGetString(s);
printf("%s = %s\n",name, v);
}
bool sOpenGLVerbose = true;
SimpleOpenGL3App::SimpleOpenGL3App( const char* title, int width,int height, bool allowRetina) SimpleOpenGL3App::SimpleOpenGL3App( const char* title, int width,int height, bool allowRetina)
{ {
gApp = this; gApp = this;
@@ -308,8 +318,17 @@ SimpleOpenGL3App::SimpleOpenGL3App( const char* title, int width,int height, boo
m_window->setWindowTitle(title); m_window->setWindowTitle(title);
b3Assert(glGetError() ==GL_NO_ERROR); b3Assert(glGetError() ==GL_NO_ERROR);
{
printGLString("Version", GL_VERSION);
printGLString("Vendor", GL_VENDOR);
printGLString("Renderer", GL_RENDERER);
}
glClearColor( m_backgroundColorRGB[0], glClearColor( m_backgroundColorRGB[0],
m_backgroundColorRGB[1], m_backgroundColorRGB[1],
m_backgroundColorRGB[2], m_backgroundColorRGB[2],
@@ -321,7 +340,10 @@ SimpleOpenGL3App::SimpleOpenGL3App( const char* title, int width,int height, boo
b3Assert(glGetError() ==GL_NO_ERROR); b3Assert(glGetError() ==GL_NO_ERROR);
#ifndef NO_GLEW //gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
#ifdef USE_GLEW
#ifndef __APPLE__ #ifndef __APPLE__
#ifndef _WIN32 #ifndef _WIN32
#ifndef B3_USE_GLFW #ifndef B3_USE_GLFW
@@ -337,7 +359,8 @@ SimpleOpenGL3App::SimpleOpenGL3App( const char* title, int width,int height, boo
exit(1); // or handle the error in a nicer way exit(1); // or handle the error in a nicer way
#endif //B3_USE_GLFW #endif //B3_USE_GLFW
#endif //__APPLE__ #endif //__APPLE__
#endif //NO_GLEW #endif //USE_GLEW
glGetError();//don't remove this call, it is needed for Ubuntu glGetError();//don't remove this call, it is needed for Ubuntu
b3Assert(glGetError() ==GL_NO_ERROR); b3Assert(glGetError() ==GL_NO_ERROR);

20
examples/OpenGLWindow/Win32OpenGLWindow.cpp
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@@ -25,12 +25,6 @@ subject to the following restrictions:
#include "Win32InternalWindowData.h" #include "Win32InternalWindowData.h"
#include <stdio.h> #include <stdio.h>
static void printGLString(const char *name, GLenum s) {
const char *v = (const char *) glGetString(s);
printf("%s = %s\n",name, v);
}
bool sOpenGLVerbose = true;
void Win32OpenGLWindow::enableOpenGL() void Win32OpenGLWindow::enableOpenGL()
{ {
@@ -63,12 +57,7 @@ void Win32OpenGLWindow::enableOpenGL()
m_data->m_hRC = wglCreateContext( m_data->m_hDC ); m_data->m_hRC = wglCreateContext( m_data->m_hDC );
wglMakeCurrent( m_data->m_hDC, m_data->m_hRC ); wglMakeCurrent( m_data->m_hDC, m_data->m_hRC );
if (sOpenGLVerbose)
{
printGLString("Version", GL_VERSION);
printGLString("Vendor", GL_VENDOR);
printGLString("Renderer", GL_RENDERER);
}
//printGLString("Extensions", GL_EXTENSIONS); //printGLString("Extensions", GL_EXTENSIONS);
} }
@@ -147,6 +136,7 @@ void Win32OpenGLWindow::endRendering()
int Win32OpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength) int Win32OpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength)
{ {
#if 0
//wchar_t wideChars[1024]; //wchar_t wideChars[1024];
OPENFILENAME ofn ; OPENFILENAME ofn ;
@@ -176,9 +166,9 @@ int Win32OpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength)
ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST ; ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST ;
GetOpenFileName( &ofn ); GetOpenFileName( &ofn );
return strlen(fileName); return strlen(fileName);
#else
return 0;
//return 0; #endif
} }
int Win32OpenGLWindow::getWidth() const int Win32OpenGLWindow::getWidth() const

2
examples/OpenGLWindow/Win32Window.cpp
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@@ -413,7 +413,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
sData->m_fullWindowHeight = wr.bottom-wr.top;//LOWORD (lParam) HIWORD (lParam); sData->m_fullWindowHeight = wr.bottom-wr.top;//LOWORD (lParam) HIWORD (lParam);
sData->m_openglViewportWidth = clientRect.right; sData->m_openglViewportWidth = clientRect.right;
sData->m_openglViewportHeight = clientRect.bottom; sData->m_openglViewportHeight = clientRect.bottom;
glViewport(0, 0, sData->m_openglViewportWidth, sData->m_openglViewportHeight); //glViewport(0, 0, sData->m_openglViewportWidth, sData->m_openglViewportHeight);
if (sData->m_resizeCallback) if (sData->m_resizeCallback)
(*sData->m_resizeCallback)(sData->m_openglViewportWidth,sData->m_openglViewportHeight); (*sData->m_resizeCallback)(sData->m_openglViewportWidth,sData->m_openglViewportHeight);

44
examples/OpenGLWindow/X11OpenGLWindow.cpp
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@@ -7,15 +7,15 @@
#include<stdio.h> #include<stdio.h>
#include<stdlib.h> #include<stdlib.h>
#ifdef GLEW_STATIC #ifdef GLEW_STATIC
#include "CustomGL/glew.h" #include "glad/glad.h"
#else #else
#include <GL/glew.h> #include <GL/glew.h>
#endif//GLEW_STATIC #endif//GLEW_STATIC
#ifdef GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS #ifdef GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS
#include "CustomGL/glxew.h" #include "glad/glad_glx.h"
#else #else
#include<GL/glx.h> #include "GL/glx.h"
#endif // GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS #endif // GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS
#include <assert.h> #include <assert.h>
@@ -473,20 +473,12 @@ void X11OpenGLWindow::enableOpenGL()
glXMakeCurrent(m_data->m_dpy, m_data->m_win, m_data->m_glc); glXMakeCurrent(m_data->m_dpy, m_data->m_win, m_data->m_glc);
} }
#ifdef GLEW_INIT_OPENGL11_FUNCTIONS if(!gladLoadGL()) {
{ printf("gladLoadGL failed!\n");
GLboolean res = glewOpenGL11Init(); exit(-1);
if (res==0) }
{
printf("glewOpenGL11Init OK!\n");
} else
{
fprintf(stderr, "ERROR: glewOpenGL11Init failed, exiting!\n");
exit(EXIT_FAILURE);
}
}
#endif //GLEW_INIT_OPENGL11_FUNCTIONS
const GLubyte* ven = glGetString(GL_VENDOR); const GLubyte* ven = glGetString(GL_VENDOR);
printf("GL_VENDOR=%s\n", ven); printf("GL_VENDOR=%s\n", ven);
@@ -530,18 +522,16 @@ void X11OpenGLWindow::createWindow(const b3gWindowConstructionInfo& ci)
m_data->m_root = DefaultRootWindow(m_data->m_dpy); m_data->m_root = DefaultRootWindow(m_data->m_dpy);
#ifdef GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS #ifdef GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS
GLboolean res = glewXInit();
if (res==0) int res=gladLoadGLX(m_data->m_dpy,DefaultScreen(m_data->m_dpy));
{ if (!res)
printf("glewXInit OK\n"); {
} else printf("Error in gladLoadGLX\n");
{ exit(0);
fprintf(stderr, "glewXInit failed, exit\n"); }
exit(EXIT_FAILURE); #endif
}
#endif //GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS
if (ci.m_openglVersion < 3) if (ci.m_openglVersion < 3)

2
examples/RobotSimulator/premake4.lua
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@@ -72,7 +72,7 @@ project ("App_RobotSimulator")
includedirs {"../../src", "../../examples", includedirs {"../../src", "../../examples",
"../../examples/ThirdPartyLibs"} "../../examples/ThirdPartyLibs"}
defines {"PHYSICS_IN_PROCESS_EXAMPLE_BROWSER"} defines {"B3_USE_ROBOTSIM_GUI", "PHYSICS_IN_PROCESS_EXAMPLE_BROWSER"}
hasCL = findOpenCL("clew") hasCL = findOpenCL("clew")

3
examples/SharedMemory/PhysicsServerCommandProcessor.cpp
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@@ -6587,7 +6587,10 @@ bool PhysicsServerCommandProcessor::processSendPhysicsParametersCommand(const st
clientCmd.m_physSimParamArgs.m_gravityAcceleration[1], clientCmd.m_physSimParamArgs.m_gravityAcceleration[1],
clientCmd.m_physSimParamArgs.m_gravityAcceleration[2]); clientCmd.m_physSimParamArgs.m_gravityAcceleration[2]);
this->m_data->m_dynamicsWorld->setGravity(grav); this->m_data->m_dynamicsWorld->setGravity(grav);
#ifndef SKIP_SOFT_BODY_MULTI_BODY_DYNAMICS_WORLD
m_data->m_dynamicsWorld->getWorldInfo().m_gravity=grav; m_data->m_dynamicsWorld->getWorldInfo().m_gravity=grav;
#endif
if (m_data->m_verboseOutput) if (m_data->m_verboseOutput)
{ {
b3Printf("Updated Gravity: %f,%f,%f",grav[0],grav[1],grav[2]); b3Printf("Updated Gravity: %f,%f,%f",grav[0],grav[1],grav[2]);

2
examples/SimpleOpenGL3/main.cpp
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@@ -78,7 +78,7 @@ int main(int argc, char* argv[])
b3CommandLineArgs myArgs(argc, argv); b3CommandLineArgs myArgs(argc, argv);
SimpleOpenGLApp* app = new SimpleOpenGLApp("SimpleOpenGL3App", gWidth, gHeight); SimpleOpenGLApp* app = new SimpleOpenGLApp("SimpleOpenGL3App", 1024, 768);
app->m_renderer->getActiveCamera()->setCameraDistance(13); app->m_renderer->getActiveCamera()->setCameraDistance(13);
app->m_renderer->getActiveCamera()->setCameraPitch(0); app->m_renderer->getActiveCamera()->setCameraPitch(0);

19093
examples/ThirdPartyLibs/Glew/CustomGL/glew.h
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File diff suppressed because it is too large Load Diff

1750
examples/ThirdPartyLibs/Glew/CustomGL/glxew.h
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File diff suppressed because it is too large Load Diff

1421
examples/ThirdPartyLibs/Glew/CustomGL/wglew.h
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File diff suppressed because it is too large Load Diff

18897
examples/ThirdPartyLibs/Glew/glew.c
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File diff suppressed because it is too large Load Diff

2
examples/ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.cpp
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@@ -15,7 +15,7 @@
#include <OpenGL/gl.h> #include <OpenGL/gl.h>
#else #else
#ifdef GLEW_STATIC #ifdef GLEW_STATIC
#include "CustomGL/glew.h" #include "glad/glad.h"
#else #else
#ifdef NO_GLEW #ifdef NO_GLEW
#define GL_GLEXT_LEGACY #define GL_GLEXT_LEGACY

2
examples/ThirdPartyLibs/glad/glad.c
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@@ -1991,7 +1991,7 @@ static void load_GL_VERSION_3_2(GLADloadproc load) {
glad_glSampleMaski = (PFNGLSAMPLEMASKIPROC)load("glSampleMaski"); glad_glSampleMaski = (PFNGLSAMPLEMASKIPROC)load("glSampleMaski");
} }
static void load_GL_VERSION_3_3(GLADloadproc load) { static void load_GL_VERSION_3_3(GLADloadproc load) {
if(!GLAD_GL_VERSION_3_3) return; //if(!GLAD_GL_VERSION_3_3) return;
glad_glBindFragDataLocationIndexed = (PFNGLBINDFRAGDATALOCATIONINDEXEDPROC)load("glBindFragDataLocationIndexed"); glad_glBindFragDataLocationIndexed = (PFNGLBINDFRAGDATALOCATIONINDEXEDPROC)load("glBindFragDataLocationIndexed");
glad_glGetFragDataIndex = (PFNGLGETFRAGDATAINDEXPROC)load("glGetFragDataIndex"); glad_glGetFragDataIndex = (PFNGLGETFRAGDATAINDEXPROC)load("glGetFragDataIndex");
glad_glGenSamplers = (PFNGLGENSAMPLERSPROC)load("glGenSamplers"); glad_glGenSamplers = (PFNGLGENSAMPLERSPROC)load("glGenSamplers");

3
test/GwenOpenGLTest/OpenGLSample.cpp
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@@ -355,9 +355,8 @@ int main()
#ifndef __APPLE__ #ifndef __APPLE__
#ifndef _WIN32 #ifndef _WIN32
//we need glewExperimental on Linux //we need glewExperimental on Linux
glewExperimental = GL_TRUE;
#endif // _WIN32 #endif // _WIN32
glewInit(); gladLoadGL();
#endif #endif
#endif //B3_USE_GLFW #endif //B3_USE_GLFW
//we ned to call glGetError twice, because of some Ubuntu/Intel/OpenGL issue //we ned to call glGetError twice, because of some Ubuntu/Intel/OpenGL issue