[scene] Add flags for finer rendering control

This takes care of rockets and lava balls casting shadows when they
shouldn't (rockets more because the shadow doesn't look that nice, lava
balls because they glow and thus shouldn't cast shadows). Same for
flames, though the small torches lost their cool sconce shadows (need to
split up the model into flame and sconce parts and mark each
separately).

include/QF/Vulkan/qf_alias.h

@@ -38,6 +38,11 @@
 #include "QF/Vulkan/qf_vid.h"
 #include "QF/Vulkan/command.h"
 
+enum {
+	alias_main,
+	alias_shadow,
+};
+
 typedef struct aliasvrt_s {
 	float       vertex[4];
 	float       normal[4];

include/QF/scene/entity.h

@@ -75,9 +75,12 @@ typedef struct visibility_s {
 typedef struct renderer_s {
 	struct model_s *model;			// NULL = no model
 	struct skin_s *skin;
+	unsigned    fullbright:1;
+	unsigned    noshadows:1;
+	unsigned    onlyshadows:1;
+	unsigned    depthhack:1;
 	float       colormod[4];	// color tint and alpha for model
 	int         skinnum;		// for Alias models
-	int         fullbright;
 	float       min_light;
 	int         render_id;
 } renderer_t;

libs/client/cl_effects.c

@@ -182,6 +182,7 @@ CL_ModelEffects (entity_t ent, int glow_color, double time)
 		});
 		Light_LinkLight (cl_world.scene->lights, light);
 		clp_funcs->RocketTrail (*old_origin, ent_origin);
+		renderer->noshadows = 1;
 	} else if (model->flags & EF_GRENADE)
 		clp_funcs->GrenadeTrail (*old_origin, ent_origin);
 	else if (model->flags & EF_GIB)

libs/client/cl_world.c

@@ -121,6 +121,7 @@ CL_ParseStatic (qmsg_t *msg, int version)
 
 	// copy it to the current state
 	renderer->model = cl_world.models.a[es.modelindex];
+	renderer->noshadows = renderer->model->shadow_alpha < 0.5;
 	animation->frame = es.frame;
 	renderer->skinnum = es.skinnum;
 

libs/video/renderer/vulkan/vulkan_alias.c

@@ -276,20 +276,22 @@ alias_draw (const exprval_t **params, exprval_t *result, exprctx_t *ectx)
 	dfunc->vkCmdBindDescriptorSets (cmd, VK_PIPELINE_BIND_POINT_GRAPHICS,
 									layout, 0, shadow ? 1 : 2, sets, 0, 0);
 
-	bool vmod = !stage && Entity_Valid (vr_data.view_model);
-
 	auto queue = r_ent_queue;	//FIXME fetch from scene
 	for (size_t i = 0; i < queue->ent_queues[mod_alias].size; i++) {
 		entity_t    ent = queue->ent_queues[mod_alias].a[i];
 		auto renderer = alias_get_renderer (ent);
+		if ((stage == alias_shadow && renderer->noshadows)
+			|| (stage == alias_main && renderer->onlyshadows)) {
+			continue;
+		}
 		// FIXME hack the depth range to prevent view model
 		// from poking into walls
-		if (vmod && ent.id == vr_data.view_model.id) {
+		if (stage == alias_main && renderer->depthhack) {
 			alias_depth_range (taskctx, 0.7, 1);
 		}
 		alias_draw_ent (taskctx, ent, pass, renderer);
 		// unhack in case the view_model is not the last
-		if (vmod && ent.id == vr_data.view_model.id) {
+		if (stage == alias_main && renderer->depthhack) {
 			alias_depth_range (taskctx, 0, 1);
 		}
 	}
@@ -302,7 +304,7 @@ static exprtype_t alias_stage_type = {
 	.get_string = cexpr_enum_get_string,
 	.data = &alias_stage_enum,
 };
-static int alias_stage_values[] = { 0, 1, };
+static int alias_stage_values[] = { alias_main, alias_shadow, };
 static exprsym_t alias_stage_symbols[] = {
 	{"main", &alias_stage_type, alias_stage_values + 0},
 	{"shadow", &alias_stage_type, alias_stage_values + 1},

nq/source/cl_ents.c

@@ -150,6 +150,7 @@ set_entity_model (int ent_ind, int modelindex)
 		} else {
 			animation->syncbase = 0.0;
 		}
+		renderer->noshadows = renderer->model->shadow_alpha < 0.5;
 	}
 	// Changing the model can change the visibility of the entity and even
 	// the model type

nq/source/cl_main.c

@@ -280,6 +280,8 @@ CL_ClearState (void)
 	r_data->lightstyle = cl.lightstyle;
 
 	cl.viewstate.weapon_entity = Scene_CreateEntity (cl_world.scene);
+	renderer_t  *renderer = Ent_GetComponent (cl.viewstate.weapon_entity.id, scene_renderer, cl_world.scene->reg);
+	renderer->depthhack = 1;
 	CL_Init_Entity (cl.viewstate.weapon_entity);
 	r_data->view_model = cl.viewstate.weapon_entity;