Add glColor4f hook

Add GL_HOOK and GL_UNHOOK macros

src/hooks.c

@@ -11,14 +11,20 @@ DECL_HOOK(CL_CreateMove);
 DECL_HOOK(HUD_Redraw);
 DECL_HOOK(StudioRenderModel);
 
+DECL_HOOK(glColor4f);
+
 bool hooks_init(void) {
     HOOK(i_client, CL_CreateMove);
     HOOK(i_client, HUD_Redraw);
     HOOK(i_studiomodelrenderer, StudioRenderModel);
 
+    GL_HOOK(glColor4f);
+
     return true;
 }
 
+/*----------------------------------------------------------------------------*/
+
 void h_CL_CreateMove(float frametime, usercmd_t* cmd, int active) {
     ORIGINAL(CL_CreateMove, frametime, cmd, active);
 
@@ -33,6 +39,8 @@ void h_CL_CreateMove(float frametime, usercmd_t* cmd, int active) {
     vec_clamp(cmd->viewangles);
 }
 
+/*----------------------------------------------------------------------------*/
+
 int h_HUD_Redraw(float time, int intermission) {
     int ret = ORIGINAL(HUD_Redraw, time, intermission);
 
@@ -54,7 +62,15 @@ int h_HUD_Redraw(float time, int intermission) {
     return ret;
 }
 
+/*----------------------------------------------------------------------------*/
+
 void h_StudioRenderModel(void* this_ptr) {
     if (!chams(this_ptr))
         ORIGINAL(StudioRenderModel, this_ptr);
 }
+
+/*----------------------------------------------------------------------------*/
+
+void h_glColor4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a) {
+    ORIGINAL(glColor4f, r, g, b, a);
+}