/*
 * 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 the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Copyright 2016, Blender Foundation.
 */

/** \file eevee_effects.c
 *  \ingroup draw_engine
 *
 * Gather all screen space effects technique such as Bloom, Motion Blur, DoF, SSAO, SSR, ...
 */

#include "DRW_render.h"

#include "BKE_global.h" /* for G.debug_value */

#include "eevee_private.h"
#include "GPU_texture.h"
#include "GPU_extensions.h"
#include "GPU_state.h"

static struct {
	/* Downsample Depth */
	struct GPUShader *minz_downlevel_sh;
	struct GPUShader *maxz_downlevel_sh;
	struct GPUShader *minz_downdepth_sh;
	struct GPUShader *maxz_downdepth_sh;
	struct GPUShader *minz_downdepth_layer_sh;
	struct GPUShader *maxz_downdepth_layer_sh;
	struct GPUShader *maxz_copydepth_layer_sh;
	struct GPUShader *minz_copydepth_sh;
	struct GPUShader *maxz_copydepth_sh;

	/* Simple Downsample */
	struct GPUShader *downsample_sh;
	struct GPUShader *downsample_cube_sh;

	/* Theses are just references, not actually allocated */
	struct GPUTexture *depth_src;
	struct GPUTexture *color_src;

	int depth_src_layer;
	float cube_texel_size;
} e_data = {NULL}; /* Engine data */

extern char datatoc_common_uniforms_lib_glsl[];
extern char datatoc_common_view_lib_glsl[];
extern char datatoc_bsdf_common_lib_glsl[];
extern char datatoc_effect_minmaxz_frag_glsl[];
extern char datatoc_effect_downsample_frag_glsl[];
extern char datatoc_effect_downsample_cube_frag_glsl[];
extern char datatoc_lightprobe_vert_glsl[];
extern char datatoc_lightprobe_geom_glsl[];


static void eevee_create_shader_downsample(void)
{
	e_data.downsample_sh = DRW_shader_create_fullscreen(datatoc_effect_downsample_frag_glsl, NULL);
	e_data.downsample_cube_sh = DRW_shader_create(
	        datatoc_lightprobe_vert_glsl,
	        datatoc_lightprobe_geom_glsl,
	        datatoc_effect_downsample_cube_frag_glsl, NULL);

	e_data.minz_downlevel_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MIN_PASS\n");
	e_data.maxz_downlevel_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MAX_PASS\n");
	e_data.minz_downdepth_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MIN_PASS\n");
	e_data.maxz_downdepth_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MAX_PASS\n");
	e_data.minz_downdepth_layer_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MIN_PASS\n"
	        "#define LAYERED\n");
	e_data.maxz_downdepth_layer_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MAX_PASS\n"
	        "#define LAYERED\n");
	e_data.maxz_copydepth_layer_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MAX_PASS\n"
	        "#define COPY_DEPTH\n"
	        "#define LAYERED\n");
	e_data.minz_copydepth_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MIN_PASS\n"
	        "#define COPY_DEPTH\n");
	e_data.maxz_copydepth_sh = DRW_shader_create_fullscreen(
	        datatoc_effect_minmaxz_frag_glsl,
	        "#define MAX_PASS\n"
	        "#define COPY_DEPTH\n");
}

#define SETUP_BUFFER(tex, fb, fb_color) { \
	eGPUTextureFormat format = (DRW_state_is_scene_render()) ? GPU_RGBA32F : GPU_RGBA16F; \
	DRW_texture_ensure_fullscreen_2D(&tex, format, DRW_TEX_FILTER | DRW_TEX_MIPMAP); \
	GPU_framebuffer_ensure_config(&fb, { \
		GPU_ATTACHMENT_TEXTURE(dtxl->depth), \
		GPU_ATTACHMENT_TEXTURE(tex), \
	}); \
	GPU_framebuffer_ensure_config(&fb_color, { \
		GPU_ATTACHMENT_NONE, \
		GPU_ATTACHMENT_TEXTURE(tex), \
	}); \
}

#define CLEANUP_BUFFER(tex, fb, fb_color) { \
	/* Cleanup to release memory */ \
	DRW_TEXTURE_FREE_SAFE(tex); \
	GPU_FRAMEBUFFER_FREE_SAFE(fb); \
	GPU_FRAMEBUFFER_FREE_SAFE(fb_color); \
}

void EEVEE_effects_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, Object *camera, const bool minimal)
{
	EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
	EEVEE_StorageList *stl = vedata->stl;
	EEVEE_FramebufferList *fbl = vedata->fbl;
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_EffectsInfo *effects;
	DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
	const DRWContextState *draw_ctx = DRW_context_state_get();
	ViewLayer *view_layer = draw_ctx->view_layer;

	const float *viewport_size = DRW_viewport_size_get();
	int size_fs[2] = {(int)viewport_size[0], (int)viewport_size[1]};

	/* Shaders */
	if (!e_data.downsample_sh) {
		eevee_create_shader_downsample();
	}

	if (!stl->effects) {
		stl->effects = MEM_callocN(sizeof(EEVEE_EffectsInfo), "EEVEE_EffectsInfo");
	}

	effects = stl->effects;

	effects->enabled_effects = 0;
	effects->enabled_effects |= (G.debug_value == 9) ? EFFECT_VELOCITY_BUFFER : 0;
	effects->enabled_effects |= EEVEE_motion_blur_init(sldata, vedata, camera);
	effects->enabled_effects |= EEVEE_bloom_init(sldata, vedata);
	effects->enabled_effects |= EEVEE_depth_of_field_init(sldata, vedata, camera);
	effects->enabled_effects |= EEVEE_temporal_sampling_init(sldata, vedata);
	effects->enabled_effects |= EEVEE_occlusion_init(sldata, vedata);
	effects->enabled_effects |= EEVEE_subsurface_init(sldata, vedata);
	effects->enabled_effects |= EEVEE_screen_raytrace_init(sldata, vedata);
	effects->enabled_effects |= EEVEE_volumes_init(sldata, vedata);

	/* Force normal buffer creation. */
	if (DRW_state_is_image_render() && !minimal &&
	    (view_layer->passflag & SCE_PASS_NORMAL) != 0)
	{
		effects->enabled_effects |= EFFECT_NORMAL_BUFFER;
	}

	/**
	 * Ping Pong buffer
	 */
	if ((effects->enabled_effects & EFFECT_POST_BUFFER) != 0) {
		SETUP_BUFFER(txl->color_post, fbl->effect_fb, fbl->effect_color_fb);
	}
	else {
		CLEANUP_BUFFER(txl->color_post, fbl->effect_fb, fbl->effect_color_fb);
	}

	/**
	 * MinMax Pyramid
	 */
	const bool half_res_hiz = true;
	int size[2], div;
	common_data->hiz_mip_offset = (half_res_hiz) ? 1 : 0;
	div = (half_res_hiz) ? 2 : 1;
	size[0] = max_ii(size_fs[0] / div, 1);
	size[1] = max_ii(size_fs[1] / div, 1);

	if (GPU_type_matches(GPU_DEVICE_INTEL, GPU_OS_ANY, GPU_DRIVER_ANY)) {
		/* Intel gpu seems to have problem rendering to only depth format */
		DRW_texture_ensure_2D(&txl->maxzbuffer, size[0], size[1], GPU_R32F, DRW_TEX_MIPMAP);
	}
	else {
		DRW_texture_ensure_2D(&txl->maxzbuffer, size[0], size[1], GPU_DEPTH_COMPONENT24, DRW_TEX_MIPMAP);
	}

	if (fbl->downsample_fb == NULL) {
		fbl->downsample_fb = GPU_framebuffer_create();
	}

	/**
	 * Compute Mipmap texel alignment.
	 */
	for (int i = 0; i < 10; ++i) {
		int mip_size[2];
		GPU_texture_get_mipmap_size(txl->color, i, mip_size);
		common_data->mip_ratio[i][0] = viewport_size[0] / (mip_size[0] * powf(2.0f, i));
		common_data->mip_ratio[i][1] = viewport_size[1] / (mip_size[1] * powf(2.0f, i));
	}

	/**
	 * Normal buffer for deferred passes.
	 */
	if ((effects->enabled_effects & EFFECT_NORMAL_BUFFER) != 0)	{
		effects->ssr_normal_input = DRW_texture_pool_query_2D(size_fs[0], size_fs[1], GPU_RG16,
		                                                      &draw_engine_eevee_type);

		GPU_framebuffer_texture_attach(fbl->main_fb, effects->ssr_normal_input, 1, 0);
	}
	else {
		effects->ssr_normal_input = NULL;
	}

	/**
	 * Motion vector buffer for correct TAA / motion blur.
	 */
	if ((effects->enabled_effects & EFFECT_VELOCITY_BUFFER) != 0) {
		effects->velocity_tx = DRW_texture_pool_query_2D(size_fs[0], size_fs[1], GPU_RG16,
		                                                 &draw_engine_eevee_type);

		/* TODO output objects velocity during the mainpass. */
		// GPU_framebuffer_texture_attach(fbl->main_fb, effects->velocity_tx, 1, 0);

		GPU_framebuffer_ensure_config(&fbl->velocity_resolve_fb, {
			GPU_ATTACHMENT_NONE,
			GPU_ATTACHMENT_TEXTURE(effects->velocity_tx)
		});
	}
	else {
		effects->velocity_tx = NULL;
	}

	/**
	 * Setup depth double buffer.
	 */
	if ((effects->enabled_effects & EFFECT_DEPTH_DOUBLE_BUFFER) != 0) {
		DRW_texture_ensure_fullscreen_2D(&txl->depth_double_buffer, GPU_DEPTH24_STENCIL8, 0);

		GPU_framebuffer_ensure_config(&fbl->double_buffer_depth_fb, {
			GPU_ATTACHMENT_TEXTURE(txl->depth_double_buffer)
		});
	}
	else {
		/* Cleanup to release memory */
		DRW_TEXTURE_FREE_SAFE(txl->depth_double_buffer);
		GPU_FRAMEBUFFER_FREE_SAFE(fbl->double_buffer_depth_fb);
	}

	/**
	 * Setup double buffer so we can access last frame as it was before post processes.
	 */
	if ((effects->enabled_effects & EFFECT_DOUBLE_BUFFER) != 0) {
		SETUP_BUFFER(txl->color_double_buffer, fbl->double_buffer_fb, fbl->double_buffer_color_fb);
	}
	else {
		CLEANUP_BUFFER(txl->color_double_buffer, fbl->double_buffer_fb, fbl->double_buffer_color_fb);
	}

	if ((effects->enabled_effects & (EFFECT_TAA | EFFECT_TAA_REPROJECT)) != 0) {
		SETUP_BUFFER(txl->taa_history, fbl->taa_history_fb, fbl->taa_history_color_fb);
	}
	else {
		CLEANUP_BUFFER(txl->taa_history, fbl->taa_history_fb, fbl->taa_history_color_fb);
	}
}

void EEVEE_effects_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_StorageList *stl = vedata->stl;
	EEVEE_EffectsInfo *effects = stl->effects;
	int downsample_write = DRW_STATE_WRITE_DEPTH;

	/* Intel gpu seems to have problem rendering to only depth format.
	 * Use color texture instead. */
	if (GPU_type_matches(GPU_DEVICE_INTEL, GPU_OS_ANY, GPU_DRIVER_ANY)) {
		downsample_write = DRW_STATE_WRITE_COLOR;
	}

	struct GPUBatch *quad = DRW_cache_fullscreen_quad_get();

	{
		psl->color_downsample_ps = DRW_pass_create(
		        "Downsample", DRW_STATE_WRITE_COLOR);
		DRWShadingGroup *grp = DRW_shgroup_create(e_data.downsample_sh, psl->color_downsample_ps);
		DRW_shgroup_uniform_texture_ref(grp, "source", &e_data.color_src);
		DRW_shgroup_uniform_float(grp, "fireflyFactor", &sldata->common_data.ssr_firefly_fac, 1);
		DRW_shgroup_call_add(grp, quad, NULL);
	}

	{
		static int zero = 0;
		static uint six = 6;
		psl->color_downsample_cube_ps = DRW_pass_create(
		        "Downsample Cube", DRW_STATE_WRITE_COLOR);
		DRWShadingGroup *grp = DRW_shgroup_create(e_data.downsample_cube_sh, psl->color_downsample_cube_ps);
		DRW_shgroup_uniform_texture_ref(grp, "source", &e_data.color_src);
		DRW_shgroup_uniform_float(grp, "texelSize", &e_data.cube_texel_size, 1);
		DRW_shgroup_uniform_int(grp, "Layer", &zero, 1);
		DRW_shgroup_call_instances_add(grp, quad, NULL, &six);
	}

	{
		/* Perform min/max downsample */
		DRWShadingGroup *grp;

		psl->maxz_downlevel_ps = DRW_pass_create(
		        "HiZ Max Down Level", downsample_write | DRW_STATE_DEPTH_ALWAYS);
		grp = DRW_shgroup_create(e_data.maxz_downlevel_sh, psl->maxz_downlevel_ps);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &txl->maxzbuffer);
		DRW_shgroup_call_add(grp, quad, NULL);

		/* Copy depth buffer to halfres top level of HiZ */

		psl->maxz_downdepth_ps = DRW_pass_create(
		        "HiZ Max Copy Depth Halfres", downsample_write | DRW_STATE_DEPTH_ALWAYS);
		grp = DRW_shgroup_create(e_data.maxz_downdepth_sh, psl->maxz_downdepth_ps);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
		DRW_shgroup_call_add(grp, quad, NULL);

		psl->maxz_downdepth_layer_ps = DRW_pass_create(
		        "HiZ Max Copy DepthLayer Halfres", downsample_write | DRW_STATE_DEPTH_ALWAYS);
		grp = DRW_shgroup_create(e_data.maxz_downdepth_layer_sh, psl->maxz_downdepth_layer_ps);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
		DRW_shgroup_uniform_int(grp, "depthLayer", &e_data.depth_src_layer, 1);
		DRW_shgroup_call_add(grp, quad, NULL);

		psl->maxz_copydepth_ps = DRW_pass_create(
		        "HiZ Max Copy Depth Fullres", downsample_write | DRW_STATE_DEPTH_ALWAYS);
		grp = DRW_shgroup_create(e_data.maxz_copydepth_sh, psl->maxz_copydepth_ps);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
		DRW_shgroup_call_add(grp, quad, NULL);

		psl->maxz_copydepth_layer_ps = DRW_pass_create(
		        "HiZ Max Copy DepthLayer Halfres", downsample_write | DRW_STATE_DEPTH_ALWAYS);
		grp = DRW_shgroup_create(e_data.maxz_copydepth_layer_sh, psl->maxz_copydepth_layer_ps);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
		DRW_shgroup_uniform_int(grp, "depthLayer", &e_data.depth_src_layer, 1);
		DRW_shgroup_call_add(grp, quad, NULL);
	}

	if ((effects->enabled_effects & EFFECT_VELOCITY_BUFFER) != 0) {
		/* This pass compute camera motions to the non moving objects. */
		psl->velocity_resolve = DRW_pass_create(
		        "Velocity Resolve", DRW_STATE_WRITE_COLOR);
		DRWShadingGroup *grp = DRW_shgroup_create(EEVEE_shaders_velocity_resolve_sh_get(), psl->velocity_resolve);
		DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
		DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
		DRW_shgroup_uniform_mat4(grp, "currPersinv", effects->velocity_curr_persinv);
		DRW_shgroup_uniform_mat4(grp, "pastPersmat", effects->velocity_past_persmat);
		DRW_shgroup_call_add(grp, quad, NULL);
	}
}

#if 0 /* Not required for now */
static void min_downsample_cb(void *vedata, int UNUSED(level))
{
	EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
	DRW_draw_pass(psl->minz_downlevel_ps);
}
#endif

static void max_downsample_cb(void *vedata, int UNUSED(level))
{
	EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
	DRW_draw_pass(psl->maxz_downlevel_ps);
}

static void simple_downsample_cb(void *vedata, int UNUSED(level))
{
	EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
	DRW_draw_pass(psl->color_downsample_ps);
}

static void simple_downsample_cube_cb(void *vedata, int level)
{
	EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
	e_data.cube_texel_size = (float)(1 << level) / (float)GPU_texture_width(e_data.color_src);
	DRW_draw_pass(psl->color_downsample_cube_ps);
}

void EEVEE_create_minmax_buffer(EEVEE_Data *vedata, GPUTexture *depth_src, int layer)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_FramebufferList *fbl = vedata->fbl;
	EEVEE_TextureList *txl = vedata->txl;

	e_data.depth_src = depth_src;
	e_data.depth_src_layer = layer;

#if 0 /* Not required for now */
	DRW_stats_group_start("Min buffer");
	/* Copy depth buffer to min texture top level */
	GPU_framebuffer_texture_attach(fbl->downsample_fb, stl->g_data->minzbuffer, 0, 0);
	GPU_framebuffer_bind(fbl->downsample_fb);
	if (layer >= 0) {
		DRW_draw_pass(psl->minz_downdepth_layer_ps);
	}
	else {
		DRW_draw_pass(psl->minz_downdepth_ps);
	}
	GPU_framebuffer_texture_detach(stl->g_data->minzbuffer);

	/* Create lower levels */
	GPU_framebuffer_recursive_downsample(fbl->downsample_fb, stl->g_data->minzbuffer, 8, &min_downsample_cb, vedata);
	DRW_stats_group_end();
#endif
	int minmax_size[3], depth_size[3];
	GPU_texture_get_mipmap_size(depth_src, 0, depth_size);
	GPU_texture_get_mipmap_size(txl->maxzbuffer, 0, minmax_size);
	bool is_full_res_minmaxz = (minmax_size[0] == depth_size[0] && minmax_size[1] == depth_size[1]);

	DRW_stats_group_start("Max buffer");
	/* Copy depth buffer to max texture top level */
	GPU_framebuffer_texture_attach(fbl->downsample_fb, txl->maxzbuffer, 0, 0);
	GPU_framebuffer_bind(fbl->downsample_fb);
	if (layer >= 0) {
		if (is_full_res_minmaxz) {
			DRW_draw_pass(psl->maxz_copydepth_layer_ps);
		}
		else {
			DRW_draw_pass(psl->maxz_downdepth_layer_ps);
		}
	}
	else {
		if (is_full_res_minmaxz) {
			DRW_draw_pass(psl->maxz_copydepth_ps);
		}
		else {
			DRW_draw_pass(psl->maxz_downdepth_ps);
		}
	}

	/* Create lower levels */
	GPU_framebuffer_recursive_downsample(fbl->downsample_fb, 8, &max_downsample_cb, vedata);
	GPU_framebuffer_texture_detach(fbl->downsample_fb, txl->maxzbuffer);
	DRW_stats_group_end();

	/* Restore */
	GPU_framebuffer_bind(fbl->main_fb);

	if (GPU_mip_render_workaround() ||
	    GPU_type_matches(GPU_DEVICE_INTEL_UHD, GPU_OS_WIN, GPU_DRIVER_ANY))
	{
		/* Fix dot corruption on intel HD5XX/HD6XX series. */
		GPU_flush();
	}
}

/**
 * Simple downsampling algorithm. Reconstruct mip chain up to mip level.
 **/
void EEVEE_downsample_buffer(EEVEE_Data *vedata, GPUTexture *texture_src, int level)
{
	EEVEE_FramebufferList *fbl = vedata->fbl;
	e_data.color_src = texture_src;

	/* Create lower levels */
	DRW_stats_group_start("Downsample buffer");
	GPU_framebuffer_texture_attach(fbl->downsample_fb, texture_src, 0, 0);
	GPU_framebuffer_recursive_downsample(fbl->downsample_fb, level, &simple_downsample_cb, vedata);
	GPU_framebuffer_texture_detach(fbl->downsample_fb, texture_src);
	DRW_stats_group_end();
}

/**
 * Simple downsampling algorithm for cubemap. Reconstruct mip chain up to mip level.
 **/
void EEVEE_downsample_cube_buffer(EEVEE_Data *vedata, GPUTexture *texture_src, int level)
{
	EEVEE_FramebufferList *fbl = vedata->fbl;
	e_data.color_src = texture_src;

	/* Create lower levels */
	DRW_stats_group_start("Downsample Cube buffer");
	GPU_framebuffer_texture_attach(fbl->downsample_fb, texture_src, 0, 0);
	GPU_framebuffer_recursive_downsample(fbl->downsample_fb, level, &simple_downsample_cube_cb, vedata);
	GPU_framebuffer_texture_detach(fbl->downsample_fb, texture_src);
	DRW_stats_group_end();
}

void EEVEE_draw_effects(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_FramebufferList *fbl = vedata->fbl;
	EEVEE_StorageList *stl = vedata->stl;
	EEVEE_EffectsInfo *effects = stl->effects;

	/* First resolve the velocity. */
	if ((effects->enabled_effects & EFFECT_VELOCITY_BUFFER) != 0) {
		DRW_viewport_matrix_get(effects->velocity_curr_persinv, DRW_MAT_PERSINV);

		GPU_framebuffer_bind(fbl->velocity_resolve_fb);
		DRW_draw_pass(psl->velocity_resolve);
	}
	DRW_viewport_matrix_get(effects->velocity_past_persmat, DRW_MAT_PERS);

	/* only once per frame after the first post process */
	effects->swap_double_buffer = ((effects->enabled_effects & EFFECT_DOUBLE_BUFFER) != 0);

	/* Init pointers */
	effects->source_buffer = txl->color; /* latest updated texture */
	effects->target_buffer = fbl->effect_color_fb; /* next target to render to */

	/* Post process stack (order matters) */
	EEVEE_motion_blur_draw(vedata);
	EEVEE_depth_of_field_draw(vedata);
	EEVEE_temporal_sampling_draw(vedata);
	EEVEE_bloom_draw(vedata);

	/* Save the final texture and framebuffer for final transformation or read. */
	effects->final_tx = effects->source_buffer;
	effects->final_fb = (effects->target_buffer != fbl->main_color_fb) ? fbl->main_fb : fbl->effect_fb;
	if ((effects->enabled_effects & EFFECT_TAA) &&
	    (effects->source_buffer == txl->taa_history))
	{
		effects->final_fb = fbl->taa_history_fb;
	}

	/* If no post processes is enabled, buffers are still not swapped, do it now. */
	SWAP_DOUBLE_BUFFERS();

	if (!stl->g_data->valid_double_buffer &&
	    ((effects->enabled_effects & EFFECT_DOUBLE_BUFFER) != 0) &&
	    (DRW_state_is_image_render() == false))
	{
		/* If history buffer is not valid request another frame.
		 * This fix black reflections on area resize. */
		DRW_viewport_request_redraw();
	}

	/* Record pers matrix for the next frame. */
	DRW_viewport_matrix_get(stl->effects->prev_persmat, DRW_MAT_PERS);

	/* Update double buffer status if render mode. */
	if (DRW_state_is_image_render()) {
		stl->g_data->valid_double_buffer = (txl->color_double_buffer != NULL);
		stl->g_data->valid_taa_history = (txl->taa_history != NULL);
	}
}

void EEVEE_effects_free(void)
{
	DRW_SHADER_FREE_SAFE(e_data.downsample_sh);
	DRW_SHADER_FREE_SAFE(e_data.downsample_cube_sh);

	DRW_SHADER_FREE_SAFE(e_data.minz_downlevel_sh);
	DRW_SHADER_FREE_SAFE(e_data.maxz_downlevel_sh);
	DRW_SHADER_FREE_SAFE(e_data.minz_downdepth_sh);
	DRW_SHADER_FREE_SAFE(e_data.maxz_downdepth_sh);
	DRW_SHADER_FREE_SAFE(e_data.minz_downdepth_layer_sh);
	DRW_SHADER_FREE_SAFE(e_data.maxz_downdepth_layer_sh);
	DRW_SHADER_FREE_SAFE(e_data.maxz_copydepth_layer_sh);
	DRW_SHADER_FREE_SAFE(e_data.minz_copydepth_sh);
	DRW_SHADER_FREE_SAFE(e_data.maxz_copydepth_sh);
}