/*
	vulkan_main.c

	Vulkan rendering

	Copyright (C) 2021 Bill Currie <bill@taniwha.org>

	Author: Bill Currie <bill@taniwha.org>
	Date: 2021/1/19

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include "string.h"
#endif
#ifdef HAVE_STRINGS_H
# include "strings.h"
#endif

#include "QF/cmd.h"
#include "QF/cvar.h"
#include "QF/image.h"
#include "QF/render.h"
#include "QF/screen.h"
#include "QF/sys.h"

#include "QF/scene/entity.h"

#include "QF/Vulkan/qf_alias.h"
#include "QF/Vulkan/qf_bsp.h"
#include "QF/Vulkan/qf_compose.h"
#include "QF/Vulkan/qf_draw.h"
#include "QF/Vulkan/qf_iqm.h"
#include "QF/Vulkan/qf_lighting.h"
#include "QF/Vulkan/qf_lightmap.h"
#include "QF/Vulkan/qf_main.h"
#include "QF/Vulkan/qf_matrices.h"
#include "QF/Vulkan/qf_particles.h"
#include "QF/Vulkan/qf_renderpass.h"
#include "QF/Vulkan/qf_scene.h"
#include "QF/Vulkan/qf_sprite.h"
#include "QF/Vulkan/qf_vid.h"
#include "QF/Vulkan/swapchain.h"

#include "mod_internal.h"
#include "r_internal.h"
#include "vid_vulkan.h"

void
Vulkan_RenderEntities (entqueue_t *queue, qfv_renderframe_t *rFrame)
{
	if (!r_drawentities)
		return;
	//FIXME need a better way (components? but HasComponent isn't free)
	int         vmod = Entity_Valid (vr_data.view_model);
#define RE_LOOP(type_name, Type) \
	do { \
		int         begun = 0; \
		for (size_t i = 0; i < queue->ent_queues[mod_##type_name].size; \
			 i++) { \
			entity_t    ent = queue->ent_queues[mod_##type_name].a[i]; \
			if (!begun) { \
				Vulkan_##Type##Begin (rFrame); \
				begun = 1; \
			} \
			/* FIXME hack the depth range to prevent view model */\
			/* from poking into walls */\
			if (vmod && ent.id == vr_data.view_model.id) { \
				Vulkan_AliasDepthRange (rFrame, 0, 0.3); \
			} \
			Vulkan_Draw##Type (ent, rFrame); \
			/* unhack in case the view_model is not the last */\
			if (vmod && ent.id == vr_data.view_model.id) { \
				Vulkan_AliasDepthRange (rFrame, 0, 1); \
			} \
		} \
		if (begun) \
			Vulkan_##Type##End (rFrame); \
	} while (0)

	RE_LOOP (alias, Alias);
	RE_LOOP (iqm, IQM);
	RE_LOOP (sprite, Sprite);
}

static void
Vulkan_DrawViewModel (vulkan_ctx_t *ctx)
{
	entity_t    ent = vr_data.view_model;
	if (!Entity_Valid (ent)) {
		return;
	}
	renderer_t *renderer = Ent_GetComponent (ent.id, scene_renderer, ent.reg);
	if (vr_data.inhibit_viewmodel
		|| !r_drawviewmodel
		|| !r_drawentities
		|| !renderer->model)
		return;

	EntQueue_AddEntity (r_ent_queue, ent, renderer->model->type);
}

void
Vulkan_RenderView (qfv_renderframe_t *rFrame)
{
	vulkan_ctx_t *ctx = rFrame->vulkan_ctx;

	if (!r_refdef.worldmodel) {
		return;
	}

	Vulkan_DrawWorld (rFrame);
	Vulkan_DrawSky (rFrame);
	if (Entity_Valid (vr_data.view_model)) {
		Vulkan_DrawViewModel (ctx);
	}
	Vulkan_DrawWaterSurfaces (rFrame);
	Vulkan_Bsp_Flush (ctx);
	Vulkan_RenderEntities (r_ent_queue, rFrame);
	Vulkan_Scene_Flush (ctx);
}

void
Vulkan_NewScene (scene_t *scene, vulkan_ctx_t *ctx)
{
	int         i;

	for (i = 0; i < 256; i++) {
		d_lightstylevalue[i] = 264;		// normal light value
	}

	r_refdef.worldmodel = scene->worldmodel;

	// Force a vis update
	R_MarkLeaves (0, 0, 0, 0);

	R_ClearParticles ();
	Vulkan_RegisterTextures (scene->models, scene->num_models, ctx);
	//Vulkan_BuildLightmaps (scene->models, scene->num_models, ctx);
	Vulkan_BuildDisplayLists (scene->models, scene->num_models, ctx);
	Vulkan_LoadLights (scene, ctx);
}

static void
main_draw (qfv_renderframe_t *rFrame)
{
	Vulkan_Matrix_Draw (rFrame);
	Vulkan_RenderView (rFrame);
	Vulkan_FlushText (rFrame);//FIXME delayed by a frame?
	Vulkan_Lighting_Draw (rFrame);
	Vulkan_Compose_Draw (rFrame);
}

void
Vulkan_Main_CreateRenderPasses (vulkan_ctx_t *ctx)
{
	qfv_output_t output = {
		.extent    = ctx->swapchain->extent,
		.view      = ctx->swapchain->imageViews->a[0],
		.format    = ctx->swapchain->format,
		.view_list = ctx->swapchain->imageViews->a,
	};
	__auto_type rp = Vulkan_CreateRenderPass (ctx, "deferred",
											  &output, main_draw);
	rp->order = QFV_rp_main;
	DARRAY_APPEND (&ctx->renderPasses, rp);
	ctx->main_renderpass = rp;
}