move extension handling into a separate file

2005-01-30 19:50:55 +00:00
parent db58e68ac1
commit 023ffa7dce
3 changed files with 173 additions and 78 deletions
@@ -0,0 +1,104 @@
+#include "global.h"
+
+#if defined(WIN32)
+#include <windows.h>
+#endif
+
+#if !defined(DARWIN)
+# include <GL/gl.h>
+# include <GL/glu.h>
+#else
+# include <OpenGL/gl.h>
+# include <OpenGL/glu.h>
+#endif
+
+#undef __glext_h_
+#include "glext.h"
+
+#include "RageDisplay_OGL_Extensions.h"
+#include "arch/LowLevelWindow/LowLevelWindow.h"
+
+GLExt_t GLExt;
+
+bool HasExtension( CString ext );
+
+#define F(n)  { (void **) &GLExt.n , #n }
+
+struct func_t
+{
+	void **p;
+	const char *name;
+};
+
+static bool LoadAllOrNothing( struct func_t *funcs, LowLevelWindow *pWind )
+{
+	bool bGotAll = true;
+	for( unsigned i = 0; funcs[i].p != NULL; ++i )
+	{
+		*funcs[i].p = pWind->GetProcAddress( funcs[i].name );
+		if( *funcs[i].p == NULL )
+		{
+			bGotAll = false;
+			break;
+		}
+	}
+
+	if( bGotAll )
+		return true;
+
+	/* If any function in the array wasn't found, clear them all. */
+	for( unsigned i = 0; funcs[i].p != NULL; ++i )
+		*funcs[i].p = NULL;
+
+	return false;
+}
+
+void GLExt_t::Load( LowLevelWindow *pWind )
+{
+	memset( this, 0, sizeof(*this) );
+
+	m_bEXT_texture_env_combine = HasExtension("GL_EXT_texture_env_combine");
+	m_bGL_EXT_bgra = HasExtension("GL_EXT_bgra");
+
+#if defined(WIN32)
+	if( HasExtension("WGL_EXT_swap_control") )
+		wglSwapIntervalEXT = (PWSWAPINTERVALEXTPROC) pWind->GetProcAddress("wglSwapIntervalEXT");
+#elif defined(DARWIN)
+	wglSwapIntervalEXT = wglSwapIntervalEXT;
+#endif
+
+	if( HasExtension("GL_EXT_paletted_texture") )
+	{
+		glColorTableEXT = (PFNGLCOLORTABLEPROC) pWind->GetProcAddress("glColorTableEXT");
+		glGetColorTableParameterivEXT = (PFNGLCOLORTABLEPARAMETERIVPROC) pWind->GetProcAddress("glGetColorTableParameterivEXT");
+	}
+
+	if( HasExtension("GL_ARB_multitexture") )
+		glActiveTextureARB = (PFNGLACTIVETEXTUREARBPROC) pWind->GetProcAddress("glActiveTextureARB");
+
+	/*
+	 * Find extension functions.
+	 *
+	 * X11R6.7.0 (or possibly ATI's drivers) seem to be returning bogus values for glBindBufferARB
+	 * if we don't actually check for GL_ARB_vertex_buffer_object. 
+	 * https://sf.net/tracker/download.php?group_id=37892&atid=421366&file_id=88086&aid=958820
+	 * https://sf.net/tracker/download.php?group_id=37892&atid=421366&file_id=85542&aid=944836
+	 *
+	 * Let's check them all, to be safe.
+	 */
+	if( HasExtension("GL_ARB_vertex_buffer_object") )
+	{
+		func_t funcs[] = {
+			F( glGenBuffersARB ),
+			F( glBindBufferARB ),
+			F( glBufferDataARB ),
+			F( glBufferSubDataARB ),
+			F( glDeleteBuffersARB )
+		};
+
+		LoadAllOrNothing( funcs, pWind );
+	}
+
+	if( HasExtension("GL_EXT_draw_range_elements") )
+		GLExt.glDrawRangeElements = (PFNGLDRAWRANGEELEMENTSPROC) pWind->GetProcAddress("glDrawRangeElements");
+}