[renderer] Handle transparent surfaces

Other than the view model (undecided on the approach) this has
R_RenderView pretty much pulled out of the low level renderers. With
this, I'll be able to focus on scene handling for a bit then getting
shadows and fisheye working (again for fisheye).

include/QF/plugin/vid_render.h

@@ -111,6 +111,7 @@ typedef struct vid_render_funcs_s {
 	void (*render_view) (void);
 	void (*draw_entities) (struct entqueue_s *queue);
 	void (*draw_particles) (struct psystem_s *psystem);
+	void (*draw_transparent) (void);
 	void (*set_2d) (int scaled);
 	void (*end_frame) (void);
 

libs/video/renderer/gl/gl_rmain.c

@@ -320,7 +320,6 @@ R_RenderScene (void)
 	gl_R_DrawWorld ();				// adds static entities to the list
 	S_ExtraUpdate ();			// don't let sound get messed up if going slow
 	gl_R_RenderDlights ();
-	gl_R_DrawWaterSurfaces ();
 	R_DrawViewModel ();
 
 	gl_Fog_DisableGFog ();

libs/video/renderer/glsl/glsl_main.c

@@ -172,7 +172,6 @@ glsl_R_RenderView (void)
 	R_SetupView ();
 	glsl_R_DrawWorld ();
 	glsl_R_DrawSky ();
-	glsl_R_DrawWaterSurfaces ();
 	R_DrawViewModel ();
 }
 

libs/video/renderer/r_screen.c

@@ -212,6 +212,7 @@ SCR_UpdateScreen (transform_t *camera, double realtime, SCR_Func *scr_funcs)
 	r_funcs->render_view ();
 	r_funcs->draw_entities (r_ent_queue);
 	r_funcs->draw_particles (&r_psystem);
+	r_funcs->draw_transparent ();
 	r_funcs->set_2d (0);
 	view_draw (r_data->scr_view);
 	r_funcs->set_2d (1);

libs/video/renderer/vid_render_gl.c

@@ -262,6 +262,12 @@ gl_render_view (void)
 	gl_R_RenderView ();
 }
 
+static void
+gl_draw_transparent (void)
+{
+	gl_R_DrawWaterSurfaces ();
+}
+
 static void
 gl_set_2d (int scaled)
 {
@@ -330,6 +336,7 @@ vid_render_funcs_t gl_vid_render_funcs = {
 	gl_render_view,
 	gl_R_RenderEntities,
 	gl_R_DrawParticles,
+	gl_draw_transparent,
 	gl_set_2d,
 	gl_end_frame,
 	&model_funcs

libs/video/renderer/vid_render_glsl.c

@@ -220,6 +220,12 @@ glsl_render_view (void)
 	glsl_R_RenderView ();
 }
 
+static void
+glsl_draw_transparent (void)
+{
+	glsl_R_DrawWaterSurfaces ();
+}
+
 static void
 glsl_set_2d (int scaled)
 {
@@ -274,6 +280,7 @@ vid_render_funcs_t glsl_vid_render_funcs = {
 	glsl_render_view,
 	glsl_R_RenderEntities,
 	glsl_R_DrawParticles,
+	glsl_draw_transparent,
 	glsl_set_2d,
 	glsl_end_frame,
 	&model_funcs

libs/video/renderer/vid_render_sw.c

@@ -144,6 +144,11 @@ sw_render_view (void)
 	R_RenderView ();
 }
 
+static void
+sw_draw_transparent (void)
+{
+}
+
 static void
 sw_set_2d (int scaled)
 {
@@ -218,6 +223,7 @@ vid_render_funcs_t sw_vid_render_funcs = {
 	sw_render_view,
 	R_DrawEntitiesOnList,
 	R_DrawParticles,
+	sw_draw_transparent,
 	sw_set_2d,
 	sw_end_frame,
 	&model_funcs

libs/video/renderer/vid_render_vulkan.c

@@ -303,6 +303,11 @@ vulkan_draw_particles (struct psystem_s *psystem)
 {
 }
 
+static void
+vulkan_draw_transparent (void)
+{
+}
+
 static void
 vulkan_set_2d (int scaled)
 {
@@ -688,6 +693,7 @@ vid_render_funcs_t vulkan_vid_render_funcs = {
 	vulkan_render_view,
 	vulkan_draw_entities,
 	vulkan_draw_particles,
+	vulkan_draw_transparent,
 	vulkan_set_2d,
 	vulkan_end_frame,
 	&model_funcs