MYST3: Removed dependency on openGL

configure

@@ -4237,11 +4237,6 @@ if test `get_engine_build myst3` = yes && test ! "$_bink" = yes ; then
 	engine_disable myst3
 fi
 
-if test `get_engine_build myst3` = yes && test ! "$_opengl" = yes ; then
-	echo "...disabling Myst 3 engine. OpenGL is required"
-	engine_disable myst3
-fi
-
 
 #
 # Figure out installation directories

engines/myst3/gfx_opengl.cpp

@@ -29,7 +29,7 @@
 #include "common/rect.h"
 #include "common/textconsole.h"
 
-#if !defined(USE_GLES2) && !defined(USE_OPENGL_SHADERS)
+#if defined(USE_OPENGL) && !defined(USE_GLES2) && !defined(USE_OPENGL_SHADERS)
 
 #include "graphics/colormasks.h"
 #include "graphics/surface.h"

engines/myst3/gfx_opengl_shaders.cpp

@@ -36,7 +36,6 @@
  * all copies or substantial portions of the Software.
  */
 
-
 #if defined(WIN32)
 #include <windows.h>
 // winnt.h defines ARRAYSIZE, but we want our own one...

engines/myst3/gfx_opengl_texture.cpp

@@ -20,6 +20,10 @@
  *
  */
 
+#include "common/scummsys.h"
+
+#if defined(USE_OPENGL) || defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
+
 #include "engines/myst3/gfx_opengl_texture.h"
 
 namespace Myst3 {
@@ -83,3 +87,5 @@ void OpenGLTexture::update(const Graphics::Surface *surface) {
 }
 
 } // end of namespace Myst3
+
+#endif

engines/myst3/myst3.cpp

@@ -156,8 +156,10 @@ Common::Error Myst3Engine::run() {
 	} else {
 #if defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
 		_gfx = CreateGfxOpenGLShader(_system);
-#else
+#elif defined(USE_OPENGL)
 		_gfx = CreateGfxOpenGL(_system);
+#else
+		_gfx = CreateGfxTinyGL(_system);
 #endif
 	}
 	_sound = new Sound(this);