ref: add R_GammaChanged function that engine calls on every gamma change

engine/ref_api.h

@@ -463,6 +463,7 @@ typedef struct ref_interface_s
 	void (*GL_ClearExtensions)( void );
 
 	// scene rendering
+	void (*R_GammaChanged)( qboolean do_reset_gamma );
 	void (*R_BeginFrame)( qboolean clearScene );
 	void (*R_RenderScene)( void );
 	void (*R_EndFrame)( void );

ref/gl/gl_context.c

@@ -372,6 +372,7 @@ ref_interface_t gReffuncs =
 	GL_InitExtensions,
 	GL_ClearExtensions,
 
+	R_GammaChanged,
 	R_BeginFrame,
 	R_RenderScene,
 	R_EndFrame,

ref/gl/gl_local.h

@@ -402,7 +402,6 @@ void R_AllowFog( qboolean allowed );
 qboolean R_OpaqueEntity( cl_entity_t *ent );
 void R_SetupFrustum( void );
 void R_FindViewLeaf( void );
-void R_CheckGamma( void );
 void R_PushScene( void );
 void R_PopScene( void );
 void R_DrawFog( void );
@@ -534,6 +533,7 @@ int GL_LoadTexture( const char *name, const byte *buf, size_t size, int flags );
 void GL_FreeImage( const char *name );
 qboolean VID_ScreenShot( const char *filename, int shot_type );
 qboolean VID_CubemapShot( const char *base, uint size, const float *vieworg, qboolean skyshot );
+void R_GammaChanged( qboolean do_reset_gamma );
 void R_BeginFrame( qboolean clearScene );
 void R_RenderFrame( const struct ref_viewpass_s *vp );
 void R_EndFrame( void );

ref/gl/gl_rmain.c

@@ -985,6 +985,22 @@ void R_RenderScene( void )
 	R_EndGL();
 }
 
+void R_GammaChanged( qboolean do_reset_gamma )
+{
+	if( do_reset_gamma )
+	{
+		// paranoia cubemap rendering
+		if( gEngfuncs.drawFuncs->GL_BuildLightmaps )
+			gEngfuncs.drawFuncs->GL_BuildLightmaps( );
+	}
+	else
+	{
+		glConfig.softwareGammaUpdate = true;
+		GL_RebuildLightmaps();
+		glConfig.softwareGammaUpdate = false;
+	}
+}
+
 /*
 ===============
 R_BeginFrame

ref/soft/r_context.c

@@ -418,6 +418,7 @@ ref_interface_t gReffuncs =
 	GL_InitExtensions,
 	GL_ClearExtensions,
 
+	R_GammaChanged,
 	R_BeginFrame,
 	R_RenderScene,
 	R_EndFrame,

ref/soft/r_local.h

@@ -607,6 +607,7 @@ int GL_LoadTexture( const char *name, const byte *buf, size_t size, int flags );
 void GL_FreeImage( const char *name );
 qboolean VID_ScreenShot( const char *filename, int shot_type );
 qboolean VID_CubemapShot( const char *base, uint size, const float *vieworg, qboolean skyshot );
+void R_GammaChanged( qboolean do_reset_gamma );
 void R_BeginFrame( qboolean clearScene );
 void R_RenderFrame( const struct ref_viewpass_s *vp );
 void R_EndFrame( void );

ref/soft/r_main.c

@@ -1636,6 +1636,14 @@ qboolean R_DoResetGamma( void )
 #endif
 }
 
+void R_GammaChanged( qboolean do_reset_gamma )
+{
+	if( do_reset_gamma ) // unused
+		return;
+
+	D_FlushCaches( );
+}
+
 /*
 ===============
 R_BeginFrame