Add a function to query supported glsl ver

data/shaders/pass.frag

@@ -1,4 +1,4 @@
-#version 330
+#version 140
 uniform sampler2D tex;
 
 in vec2 uv;

data/shaders/pass.vert

@@ -1,5 +1,5 @@
 // Passthrough shader for drawQuad()
-#version 330
+#version 140
 
 in vec3 Position;
 in vec2 Texcoord;

lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp

@@ -368,6 +368,65 @@ void IrrPrintXGrabError(int grabResult, const c8 * grabCommand )
 }
 #endif
 
+static GLXContext getMeAGLContext(Display *display, GLXFBConfig glxFBConfig)
+{
+	GLXContext Context;
+	int compat33ctx[] =
+		{
+			GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+			GLX_CONTEXT_MINOR_VERSION_ARB, 3,
+			GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
+			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
+			None
+		};
+	int core33ctx[] =
+		{
+			GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+			GLX_CONTEXT_MINOR_VERSION_ARB, 3,
+			GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
+			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
+			None
+		};
+	int core31ctx[] =
+		{
+			GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+			GLX_CONTEXT_MINOR_VERSION_ARB, 1,
+			GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
+			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
+			None
+		};
+	int legacyctx[] =
+		{
+			GLX_CONTEXT_MAJOR_VERSION_ARB, 2,
+			GLX_CONTEXT_MINOR_VERSION_ARB, 1,
+			None
+		};
+	PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = 0;
+	glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
+						glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
+
+	// create compat 3.3 context (for proprietary drivers)
+	Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, compat33ctx);
+	if (!XErrorSignaled)
+		return Context;
+
+	XErrorSignaled = false;
+	// create core 3.3 context (for mesa)
+	Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, core33ctx);
+	if (!XErrorSignaled)
+		return Context;
+
+	XErrorSignaled = false;
+	// create core 3.1 context (for older mesa)
+	Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, core31ctx);
+	if (!XErrorSignaled)
+		return Context;
+
+	XErrorSignaled = false;
+	// fall back to legacy context
+	Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, legacyctx);
+	return Context;
+}
 
 bool CIrrDeviceLinux::createWindow()
 {
@@ -741,30 +800,7 @@ bool CIrrDeviceLinux::createWindow()
 		glxWin=glXCreateWindow(display,glxFBConfig,window,NULL);
 		if (glxWin)
 		{
-			int context_attribs[] =
+			Context = getMeAGLContext(display, glxFBConfig);
-				{
-					GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
-					GLX_CONTEXT_MINOR_VERSION_ARB, 3,
-                    GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB, //GLX_CONTEXT_CORE_PROFILE_BIT_ARB
-					GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
-					None
-				};
-			PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB = 0;
-			glXCreateContextAttribsARB = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
-								glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
-			// create glx context
-			Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, context_attribs);
-			if (XErrorSignaled)
-			{
-				int context_attribs[] =
-					{
-						GLX_CONTEXT_MAJOR_VERSION_ARB, 2,
-						GLX_CONTEXT_MINOR_VERSION_ARB, 1,
-						None
-					};
-				Context = glXCreateContextAttribsARB(display, glxFBConfig, 0, True, context_attribs);
-				XErrorSignaled = false;
-			}
 			if (Context)
 			{
 				if (!glXMakeContextCurrent(display, glxWin, glxWin, Context))

src/graphics/glwrap.cpp

@@ -210,7 +210,9 @@ void initGL()
 static GLuint LoadShader(const char * file, unsigned type)
 {
 	GLuint Id = glCreateShader(type);
-    std::string Code = "#version 330\n";
+    char versionString[20];
+    sprintf(versionString, "#version %d\n", irr_driver->getGLSLVersion());
+    std::string Code = versionString;
 	std::ifstream Stream(file, std::ios::in);
 	if (Stream.is_open())
 	{

src/graphics/irr_driver.cpp

@@ -422,12 +422,12 @@ void IrrDriver::initDevice()
     m_gui_env       = m_device->getGUIEnvironment();
     m_video_driver  = m_device->getVideoDriver();
 
-	int GLMajorVersion = 0, GLMinorVersion = 0;
+    GLMajorVersion = 2;
+    GLMinorVersion = 1;
 	glGetIntegerv(GL_MAJOR_VERSION, &GLMajorVersion);
     glGetIntegerv(GL_MINOR_VERSION, &GLMinorVersion);
     Log::info("IrrDriver", "OPENGL VERSION IS %d.%d", GLMajorVersion, GLMinorVersion);
-	m_glsl = (GLMajorVersion > 3 || (GLMajorVersion == 3 && GLMinorVersion == 3)) && UserConfigParams::m_pixel_shaders;
+	m_glsl = (GLMajorVersion > 3 || (GLMajorVersion == 3 && GLMinorVersion >= 1)) && UserConfigParams::m_pixel_shaders;
-                      
 
     // This remaps the window, so it has to be done before the clear to avoid flicker
     m_device->setResizable(false);

src/graphics/irr_driver.hpp

@@ -82,6 +82,7 @@ enum STKRenderingPass
 class IrrDriver : public IEventReceiver, public NoCopy
 {
 private:
+    int GLMajorVersion, GLMinorVersion;
     /** The irrlicht device. */
     IrrlichtDevice             *m_device;
     /** Irrlicht scene manager. */
@@ -148,6 +149,16 @@ public:
         float power;
     };
 
+    unsigned getGLSLVersion() const
+    {
+        if (GLMajorVersion > 3 || (GLMajorVersion == 3 && GLMinorVersion == 3))
+            return GLMajorVersion * 100 + GLMinorVersion * 10;
+        else if (GLMajorVersion == 3)
+            return 100 + (GLMinorVersion + 3) * 10;
+        else
+            return 120;
+    }
+
 private:
     std::vector<VideoMode> m_modes;