X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbackends%2Fopengl%2Fbackend_opengl.cpp;fp=source%2Fbackends%2Fopengl%2Fbackend_opengl.cpp;h=ce8fc17b181768b274279a9809013d691dcb5bd2;hb=160e9eea29bd10034733d59507fa1bcca36be401;hp=0000000000000000000000000000000000000000;hpb=93448d16e72e38afbaecbccf6fdedd46d6a82a73;p=libs%2Fgl.git

diff --git a/source/backends/opengl/backend_opengl.cpp b/source/backends/opengl/backend_opengl.cpp
new file mode 100644
index 00000000..ce8fc17b
--- /dev/null
+++ b/source/backends/opengl/backend_opengl.cpp
@@ -0,0 +1,49 @@
+#include <stdexcept>
+#include <cstdlib>
+#include "backend.h"
+#include "gl.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+GraphicsApi get_backend_api()
+{
+#ifdef GL_ES_VERSION_2_0
+	return OPENGL_ES;
+#else
+	return OPENGL;
+#endif
+}
+
+inline Version get_gl_version()
+{
+	const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
+	if(!gl_ver_ptr)
+		throw runtime_error("OpenGL version not available");
+
+	string gl_ver = gl_ver_ptr;
+	if(!gl_ver.compare(0, 10, "OpenGL ES "))
+		gl_ver.erase(0, 10);
+
+	Version ver(gl_ver.substr(0, gl_ver.find(' ')));
+
+	if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
+	{
+		Version force_ver(force_ver_ptr);
+		if(force_ver<ver)
+			ver = force_ver;
+	}
+
+	return ver;
+}
+
+const Version &get_backend_version()
+{
+	static Version version = get_gl_version();
+	return version;
+}
+
+} // namespace GL
+} // namespace Msp