Implement Physical Light Units as an optional setting.

This allows light sources to be specified in physical light units in addition to the regular energy multiplier. In order to avoid loss of precision at high values, brightness values are premultiplied by an exposure normalization value.

In support of Physical Light Units this PR also renames CameraEffects to CameraAttributes.

8 files changed, 163 insertions, 60 deletions

diff --git a/drivers/gles3/environment/gi.cpp b/drivers/gles3/environment/gi.cpp
index 84cdb81d35..5b16d3539f 100644
--- a/drivers/gles3/environment/gi.cpp
+++ b/drivers/gles3/environment/gi.cpp
@@ -98,6 +98,13 @@ float GI::voxel_gi_get_energy(RID p_voxel_gi) const {
 	return 0.0;
 }
 
+void GI::voxel_gi_set_baked_exposure_normalization(RID p_voxel_gi, float p_baked_exposure) {
+}
+
+float GI::voxel_gi_get_baked_exposure_normalization(RID p_voxel_gi) const {
+	return 1.0;
+}
+
 void GI::voxel_gi_set_bias(RID p_voxel_gi, float p_range) {
 }
 
diff --git a/drivers/gles3/environment/gi.h b/drivers/gles3/environment/gi.h
index 7a0634f22b..5b0aad380e 100644
--- a/drivers/gles3/environment/gi.h
+++ b/drivers/gles3/environment/gi.h
@@ -74,6 +74,9 @@ public:
 	virtual void voxel_gi_set_energy(RID p_voxel_gi, float p_range) override;
 	virtual float voxel_gi_get_energy(RID p_voxel_gi) const override;
 
+	virtual void voxel_gi_set_baked_exposure_normalization(RID p_voxel_gi, float p_baked_exposure) override;
+	virtual float voxel_gi_get_baked_exposure_normalization(RID p_voxel_gi) const override;
+
 	virtual void voxel_gi_set_bias(RID p_voxel_gi, float p_range) override;
 	virtual float voxel_gi_get_bias(RID p_voxel_gi) const override;
 
diff --git a/drivers/gles3/rasterizer_scene_gles3.cpp b/drivers/gles3/rasterizer_scene_gles3.cpp
index cb479dda39..504a7e218d 100644
--- a/drivers/gles3/rasterizer_scene_gles3.cpp
+++ b/drivers/gles3/rasterizer_scene_gles3.cpp
@@ -483,6 +483,13 @@ void RasterizerSceneGLES3::sky_set_material(RID p_sky, RID p_material) {
 	_invalidate_sky(sky);
 }
 
+float RasterizerSceneGLES3::sky_get_baked_exposure(RID p_sky) const {
+	Sky *sky = sky_owner.get_or_null(p_sky);
+	ERR_FAIL_COND_V(!sky, 1.0);
+
+	return sky->baked_exposure;
+}
+
 void RasterizerSceneGLES3::_invalidate_sky(Sky *p_sky) {
 	if (!p_sky->dirty) {
 		p_sky->dirty = true;
@@ -561,13 +568,13 @@ void RasterizerSceneGLES3::_update_dirty_skys() {
 	dirty_sky_list = nullptr;
 }
 
-void RasterizerSceneGLES3::_setup_sky(RID p_env, RID p_render_buffers, const PagedArray<RID> &p_lights, const Projection &p_projection, const Transform3D &p_transform, const Size2i p_screen_size) {
+void RasterizerSceneGLES3::_setup_sky(const RenderDataGLES3 *p_render_data, RID p_render_buffers, const PagedArray<RID> &p_lights, const Projection &p_projection, const Transform3D &p_transform, const Size2i p_screen_size) {
 	GLES3::LightStorage *light_storage = GLES3::LightStorage::get_singleton();
 	GLES3::MaterialStorage *material_storage = GLES3::MaterialStorage::get_singleton();
-	ERR_FAIL_COND(p_env.is_null());
+	ERR_FAIL_COND(p_render_data->environment.is_null());
 
 	GLES3::SkyMaterialData *material = nullptr;
-	Sky *sky = sky_owner.get_or_null(environment_get_sky(p_env));
+	Sky *sky = sky_owner.get_or_null(environment_get_sky(p_render_data->environment));
 
 	RID sky_material;
 
@@ -639,6 +646,14 @@ void RasterizerSceneGLES3::_setup_sky(RID p_env, RID p_render_buffers, const Pag
 					float sign = light_storage->light_is_negative(base) ? -1 : 1;
 					sky_light_data.energy = sign * light_storage->light_get_param(base, RS::LIGHT_PARAM_ENERGY);
 
+					if (is_using_physical_light_units()) {
+						sky_light_data.energy *= light_storage->light_get_param(base, RS::LIGHT_PARAM_INTENSITY);
+					}
+
+					if (p_render_data->camera_attributes.is_valid()) {
+						sky_light_data.energy *= RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(p_render_data->camera_attributes);
+					}
+
 					Color linear_col = light_storage->light_get_color(base);
 					sky_light_data.color[0] = linear_col.r;
 					sky_light_data.color[1] = linear_col.g;
@@ -708,7 +723,7 @@ void RasterizerSceneGLES3::_setup_sky(RID p_env, RID p_render_buffers, const Pag
 	}
 }
 
-void RasterizerSceneGLES3::_draw_sky(RID p_env, const Projection &p_projection, const Transform3D &p_transform) {
+void RasterizerSceneGLES3::_draw_sky(RID p_env, const Projection &p_projection, const Transform3D &p_transform, float p_luminance_multiplier) {
 	GLES3::MaterialStorage *material_storage = GLES3::MaterialStorage::get_singleton();
 	ERR_FAIL_COND(p_env.is_null());
 
@@ -768,12 +783,13 @@ void RasterizerSceneGLES3::_draw_sky(RID p_env, const Projection &p_projection,
 	GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::PROJECTION, camera.matrix[2][0], camera.matrix[0][0], camera.matrix[2][1], camera.matrix[1][1], shader_data->version, SkyShaderGLES3::MODE_BACKGROUND);
 	GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::POSITION, p_transform.origin, shader_data->version, SkyShaderGLES3::MODE_BACKGROUND);
 	GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::TIME, time, shader_data->version, SkyShaderGLES3::MODE_BACKGROUND);
+	GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::LUMINANCE_MULTIPLIER, p_luminance_multiplier, shader_data->version, SkyShaderGLES3::MODE_BACKGROUND);
 
 	glBindVertexArray(sky_globals.screen_triangle_array);
 	glDrawArrays(GL_TRIANGLES, 0, 3);
 }
 
-void RasterizerSceneGLES3::_update_sky_radiance(RID p_env, const Projection &p_projection, const Transform3D &p_transform) {
+void RasterizerSceneGLES3::_update_sky_radiance(RID p_env, const Projection &p_projection, const Transform3D &p_transform, float p_luminance_multiplier) {
 	GLES3::MaterialStorage *material_storage = GLES3::MaterialStorage::get_singleton();
 	ERR_FAIL_COND(p_env.is_null());
 
@@ -866,6 +882,7 @@ void RasterizerSceneGLES3::_update_sky_radiance(RID p_env, const Projection &p_p
 		GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::POSITION, p_transform.origin, shader_data->version, SkyShaderGLES3::MODE_CUBEMAP);
 		GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::TIME, time, shader_data->version, SkyShaderGLES3::MODE_CUBEMAP);
 		GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::PROJECTION, cm.matrix[2][0], cm.matrix[0][0], cm.matrix[2][1], cm.matrix[1][1], shader_data->version, SkyShaderGLES3::MODE_CUBEMAP);
+		GLES3::MaterialStorage::get_singleton()->shaders.sky_shader.version_set_uniform(SkyShaderGLES3::LUMINANCE_MULTIPLIER, p_luminance_multiplier, shader_data->version, SkyShaderGLES3::MODE_CUBEMAP);
 
 		glBindVertexArray(sky_globals.screen_triangle_array);
 
@@ -887,7 +904,7 @@ void RasterizerSceneGLES3::_update_sky_radiance(RID p_env, const Projection &p_p
 			_filter_sky_radiance(sky, 0); //Just copy over the first mipmap
 		}
 		sky->processing_layer = 1;
-
+		sky->baked_exposure = p_luminance_multiplier;
 		sky->reflection_dirty = false;
 	} else {
 		if (sky_mode == RS::SKY_MODE_INCREMENTAL && sky->processing_layer < max_processing_layer) {
@@ -1061,25 +1078,6 @@ Ref<Image> RasterizerSceneGLES3::environment_bake_panorama(RID p_env, bool p_bak
 	return Ref<Image>();
 }
 
-RID RasterizerSceneGLES3::camera_effects_allocate() {
-	return RID();
-}
-
-void RasterizerSceneGLES3::camera_effects_initialize(RID p_rid) {
-}
-
-void RasterizerSceneGLES3::camera_effects_set_dof_blur_quality(RS::DOFBlurQuality p_quality, bool p_use_jitter) {
-}
-
-void RasterizerSceneGLES3::camera_effects_set_dof_blur_bokeh_shape(RS::DOFBokehShape p_shape) {
-}
-
-void RasterizerSceneGLES3::camera_effects_set_dof_blur(RID p_camera_effects, bool p_far_enable, float p_far_distance, float p_far_transition, bool p_near_enable, float p_near_distance, float p_near_transition, float p_amount) {
-}
-
-void RasterizerSceneGLES3::camera_effects_set_custom_exposure(RID p_camera_effects, bool p_enable, float p_exposure) {
-}
-
 void RasterizerSceneGLES3::positional_soft_shadow_filter_set_quality(RS::ShadowQuality p_quality) {
 }
 
@@ -1403,8 +1401,9 @@ void RasterizerSceneGLES3::_setup_environment(const RenderDataGLES3 *p_render_da
 		RS::EnvironmentBG env_bg = environment_get_background(p_render_data->environment);
 		RS::EnvironmentAmbientSource ambient_src = environment_get_ambient_source(p_render_data->environment);
 
-		float bg_energy = environment_get_bg_energy(p_render_data->environment);
-		scene_state.ubo.ambient_light_color_energy[3] = bg_energy;
+		float bg_energy_multiplier = environment_get_bg_energy_multiplier(p_render_data->environment);
+
+		scene_state.ubo.ambient_light_color_energy[3] = bg_energy_multiplier;
 
 		scene_state.ubo.ambient_color_sky_mix = environment_get_ambient_sky_contribution(p_render_data->environment);
 
@@ -1413,9 +1412,9 @@ void RasterizerSceneGLES3::_setup_environment(const RenderDataGLES3 *p_render_da
 			Color color = env_bg == RS::ENV_BG_CLEAR_COLOR ? p_default_bg_color : environment_get_bg_color(p_render_data->environment);
 			color = color.srgb_to_linear();
 
-			scene_state.ubo.ambient_light_color_energy[0] = color.r * bg_energy;
-			scene_state.ubo.ambient_light_color_energy[1] = color.g * bg_energy;
-			scene_state.ubo.ambient_light_color_energy[2] = color.b * bg_energy;
+			scene_state.ubo.ambient_light_color_energy[0] = color.r * bg_energy_multiplier;
+			scene_state.ubo.ambient_light_color_energy[1] = color.g * bg_energy_multiplier;
+			scene_state.ubo.ambient_light_color_energy[2] = color.b * bg_energy_multiplier;
 			scene_state.ubo.use_ambient_light = true;
 			scene_state.ubo.use_ambient_cubemap = false;
 		} else {
@@ -1459,6 +1458,25 @@ void RasterizerSceneGLES3::_setup_environment(const RenderDataGLES3 *p_render_da
 	} else {
 	}
 
+	if (p_render_data->camera_attributes.is_valid()) {
+		scene_state.ubo.emissive_exposure_normalization = RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(p_render_data->camera_attributes);
+		scene_state.ubo.IBL_exposure_normalization = 1.0;
+		if (is_environment(p_render_data->environment)) {
+			RID sky_rid = environment_get_sky(p_render_data->environment);
+			if (sky_rid.is_valid()) {
+				float current_exposure = RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(p_render_data->camera_attributes) * environment_get_bg_intensity(p_render_data->environment);
+				scene_state.ubo.IBL_exposure_normalization = current_exposure / MAX(0.001, sky_get_baked_exposure(sky_rid));
+			}
+		}
+	} else if (scene_state.ubo.emissive_exposure_normalization > 0.0) {
+		// This branch is triggered when using render_material().
+		// Emissive is set outside the function, so don't set it.
+		// IBL isn't used don't set it.
+	} else {
+		scene_state.ubo.emissive_exposure_normalization = 1.0;
+		scene_state.ubo.IBL_exposure_normalization = 1.0;
+	}
+
 	if (scene_state.ubo_buffer == 0) {
 		glGenBuffers(1, &scene_state.ubo_buffer);
 	}
@@ -1510,7 +1528,17 @@ void RasterizerSceneGLES3::_setup_lights(const RenderDataGLES3 *p_render_data, b
 
 				float sign = light_storage->light_is_negative(base) ? -1 : 1;
 
-				light_data.energy = sign * light_storage->light_get_param(base, RS::LIGHT_PARAM_ENERGY) * Math_PI;
+				light_data.energy = sign * light_storage->light_get_param(base, RS::LIGHT_PARAM_ENERGY);
+
+				if (is_using_physical_light_units()) {
+					light_data.energy *= light_storage->light_get_param(base, RS::LIGHT_PARAM_INTENSITY);
+				} else {
+					light_data.energy *= Math_PI;
+				}
+
+				if (p_render_data->camera_attributes.is_valid()) {
+					light_data.energy *= RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(p_render_data->camera_attributes);
+				}
 
 				Color linear_col = light_storage->light_get_color(base).srgb_to_linear();
 				light_data.color[0] = linear_col.r;
@@ -1590,7 +1618,7 @@ void RasterizerSceneGLES3::_setup_lights(const RenderDataGLES3 *p_render_data, b
 	for (uint32_t i = 0; i < (r_omni_light_count + r_spot_light_count); i++) {
 		uint32_t index = (i < r_omni_light_count) ? i : i - (r_omni_light_count);
 		LightData &light_data = (i < r_omni_light_count) ? scene_state.omni_lights[index] : scene_state.spot_lights[index];
-		//RS::LightType type = (i < omni_light_count) ? RS::LIGHT_OMNI : RS::LIGHT_SPOT;
+		RS::LightType type = (i < r_omni_light_count) ? RS::LIGHT_OMNI : RS::LIGHT_SPOT;
 		LightInstance *li = (i < r_omni_light_count) ? scene_state.omni_light_sort[index].instance : scene_state.spot_light_sort[index].instance;
 		RID base = li->light;
 
@@ -1634,7 +1662,26 @@ void RasterizerSceneGLES3::_setup_lights(const RenderDataGLES3 *p_render_data, b
 			}
 		}
 
-		float energy = sign * light_storage->light_get_param(base, RS::LIGHT_PARAM_ENERGY) * Math_PI * fade;
+		float energy = sign * light_storage->light_get_param(base, RS::LIGHT_PARAM_ENERGY) * fade;
+
+		if (is_using_physical_light_units()) {
+			energy *= light_storage->light_get_param(base, RS::LIGHT_PARAM_INTENSITY);
+
+			// Convert from Luminous Power to Luminous Intensity
+			if (type == RS::LIGHT_OMNI) {
+				energy *= 1.0 / (Math_PI * 4.0);
+			} else {
+				// Spot Lights are not physically accurate, Luminous Intensity should change in relation to the cone angle.
+				// We make this assumption to keep them easy to control.
+				energy *= 1.0 / Math_PI;
+			}
+		} else {
+			energy *= Math_PI;
+		}
+
+		if (p_render_data->camera_attributes.is_valid()) {
+			energy *= RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(p_render_data->camera_attributes);
+		}
 
 		light_data.color[0] = linear_col.r * energy;
 		light_data.color[1] = linear_col.g * energy;
@@ -1671,7 +1718,7 @@ void RasterizerSceneGLES3::_setup_lights(const RenderDataGLES3 *p_render_data, b
 	glBindBuffer(GL_UNIFORM_BUFFER, 0);
 }
 
-void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *p_camera_data, const CameraData *p_prev_camera_data, const PagedArray<RenderGeometryInstance *> &p_instances, const PagedArray<RID> &p_lights, const PagedArray<RID> &p_reflection_probes, const PagedArray<RID> &p_voxel_gi_instances, const PagedArray<RID> &p_decals, const PagedArray<RID> &p_lightmaps, const PagedArray<RID> &p_fog_volumes, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_occluder_debug_tex, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_mesh_lod_threshold, const RenderShadowData *p_render_shadows, int p_render_shadow_count, const RenderSDFGIData *p_render_sdfgi_regions, int p_render_sdfgi_region_count, const RenderSDFGIUpdateData *p_sdfgi_update_data, RendererScene::RenderInfo *r_render_info) {
+void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *p_camera_data, const CameraData *p_prev_camera_data, const PagedArray<RenderGeometryInstance *> &p_instances, const PagedArray<RID> &p_lights, const PagedArray<RID> &p_reflection_probes, const PagedArray<RID> &p_voxel_gi_instances, const PagedArray<RID> &p_decals, const PagedArray<RID> &p_lightmaps, const PagedArray<RID> &p_fog_volumes, RID p_environment, RID p_camera_attributes, RID p_shadow_atlas, RID p_occluder_debug_tex, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_mesh_lod_threshold, const RenderShadowData *p_render_shadows, int p_render_shadow_count, const RenderSDFGIData *p_render_sdfgi_regions, int p_render_sdfgi_region_count, const RenderSDFGIUpdateData *p_sdfgi_update_data, RendererScene::RenderInfo *r_render_info) {
 	GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
 	GLES3::Config *config = GLES3::Config::get_singleton();
 	RENDER_TIMESTAMP("Setup 3D Scene");
@@ -1707,7 +1754,7 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 		render_data.lights = &p_lights;
 		render_data.reflection_probes = &p_reflection_probes;
 		render_data.environment = p_environment;
-		render_data.camera_effects = p_camera_effects;
+		render_data.camera_attributes = p_camera_attributes;
 		render_data.reflection_probe = p_reflection_probe;
 		render_data.reflection_probe_pass = p_reflection_probe_pass;
 
@@ -1768,6 +1815,8 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 	glBindBufferBase(GL_UNIFORM_BUFFER, SCENE_TONEMAP_UNIFORM_LOCATION, scene_state.tonemap_buffer);
 	glBufferData(GL_UNIFORM_BUFFER, sizeof(SceneState::TonemapUBO), &tonemap_ubo, GL_STREAM_DRAW);
 
+	scene_state.ubo.emissive_exposure_normalization = -1.0; // Use default exposure normalization.
+
 	_setup_lights(&render_data, false, render_data.directional_light_count, render_data.omni_light_count, render_data.spot_light_count);
 	_setup_environment(&render_data, render_data.reflection_probe.is_valid(), screen_size, !render_data.reflection_probe.is_valid(), clear_color, false);
 
@@ -1778,17 +1827,24 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 	bool draw_sky = false;
 	bool draw_sky_fog_only = false;
 	bool keep_color = false;
+	float sky_energy_multiplier = 1.0;
 
 	if (get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_OVERDRAW) {
 		clear_color = Color(0, 0, 0, 1); //in overdraw mode, BG should always be black
 	} else if (render_data.environment.is_valid()) {
 		RS::EnvironmentBG bg_mode = environment_get_background(render_data.environment);
-		float bg_energy = environment_get_bg_energy(render_data.environment);
+		float bg_energy_multiplier = environment_get_bg_energy_multiplier(render_data.environment);
+		bg_energy_multiplier *= environment_get_bg_intensity(render_data.environment);
+
+		if (render_data.camera_attributes.is_valid()) {
+			bg_energy_multiplier *= RSG::camera_attributes->camera_attributes_get_exposure_normalization_factor(render_data.camera_attributes);
+		}
+
 		switch (bg_mode) {
 			case RS::ENV_BG_CLEAR_COLOR: {
-				clear_color.r *= bg_energy;
-				clear_color.g *= bg_energy;
-				clear_color.b *= bg_energy;
+				clear_color.r *= bg_energy_multiplier;
+				clear_color.g *= bg_energy_multiplier;
+				clear_color.b *= bg_energy_multiplier;
 				if (environment_get_fog_enabled(render_data.environment)) {
 					draw_sky_fog_only = true;
 					GLES3::MaterialStorage::get_singleton()->material_set_param(sky_globals.fog_material, "clear_color", Variant(clear_color));
@@ -1796,9 +1852,9 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 			} break;
 			case RS::ENV_BG_COLOR: {
 				clear_color = environment_get_bg_color(render_data.environment);
-				clear_color.r *= bg_energy;
-				clear_color.g *= bg_energy;
-				clear_color.b *= bg_energy;
+				clear_color.r *= bg_energy_multiplier;
+				clear_color.g *= bg_energy_multiplier;
+				clear_color.b *= bg_energy_multiplier;
 				if (environment_get_fog_enabled(render_data.environment)) {
 					draw_sky_fog_only = true;
 					GLES3::MaterialStorage::get_singleton()->material_set_param(sky_globals.fog_material, "clear_color", Variant(clear_color));
@@ -1828,11 +1884,13 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 				projection = correction * render_data.cam_projection;
 			}
 
-			_setup_sky(render_data.environment, p_render_buffers, *render_data.lights, projection, render_data.cam_transform, screen_size);
+			sky_energy_multiplier *= bg_energy_multiplier;
+
+			_setup_sky(&render_data, p_render_buffers, *render_data.lights, projection, render_data.cam_transform, screen_size);
 
 			if (environment_get_sky(render_data.environment).is_valid()) {
 				if (environment_get_reflection_source(render_data.environment) == RS::ENV_REFLECTION_SOURCE_SKY || environment_get_ambient_source(render_data.environment) == RS::ENV_AMBIENT_SOURCE_SKY || (environment_get_reflection_source(render_data.environment) == RS::ENV_REFLECTION_SOURCE_BG && environment_get_background(render_data.environment) == RS::ENV_BG_SKY)) {
-					_update_sky_radiance(render_data.environment, projection, render_data.cam_transform);
+					_update_sky_radiance(render_data.environment, projection, render_data.cam_transform, sky_energy_multiplier);
 				}
 			} else {
 				// do not try to draw sky if invalid
@@ -1936,7 +1994,7 @@ void RasterizerSceneGLES3::render_scene(RID p_render_buffers, const CameraData *
 		scene_state.current_depth_draw = GLES3::SceneShaderData::DEPTH_DRAW_DISABLED;
 		scene_state.cull_mode = GLES3::SceneShaderData::CULL_BACK;
 
-		_draw_sky(render_data.environment, render_data.cam_projection, render_data.cam_transform);
+		_draw_sky(render_data.environment, render_data.cam_projection, render_data.cam_transform, sky_energy_multiplier);
 	}
 
 	RENDER_TIMESTAMP("Render 3D Transparent Pass");
@@ -2406,6 +2464,9 @@ bool RasterizerSceneGLES3::free(RID p_rid) {
 		LightInstance *light_instance = light_instance_owner.get_or_null(p_rid);
 		ERR_FAIL_COND_V(!light_instance, false);
 		light_instance_owner.free(p_rid);
+	} else if (RSG::camera_attributes->owns_camera_attributes(p_rid)) {
+		//not much to delete, just free it
+		RSG::camera_attributes->camera_attributes_free(p_rid);
 	} else {
 		return false;
 	}
@@ -2431,6 +2492,9 @@ RasterizerSceneGLES3::RasterizerSceneGLES3() {
 	GLES3::MaterialStorage *material_storage = GLES3::MaterialStorage::get_singleton();
 	GLES3::Config *config = GLES3::Config::get_singleton();
 
+	// Quality settings.
+	use_physical_light_units = GLOBAL_GET("rendering/lights_and_shadows/use_physical_light_units");
+
 	{
 		// Setup Lights
 
diff --git a/drivers/gles3/rasterizer_scene_gles3.h b/drivers/gles3/rasterizer_scene_gles3.h
index a54d87a3a3..526da88ef6 100644
--- a/drivers/gles3/rasterizer_scene_gles3.h
+++ b/drivers/gles3/rasterizer_scene_gles3.h
@@ -111,7 +111,7 @@ struct RenderDataGLES3 {
 	const PagedArray<RID> *lights = nullptr;
 	const PagedArray<RID> *reflection_probes = nullptr;
 	RID environment = RID();
-	RID camera_effects = RID();
+	RID camera_attributes = RID();
 	RID reflection_probe = RID();
 	int reflection_probe_pass = 0;
 
@@ -344,7 +344,7 @@ private:
 
 			float ambient_color_sky_mix;
 			uint32_t material_uv2_mode;
-			float pad2;
+			float emissive_exposure_normalization;
 			uint32_t use_ambient_light = 0;
 
 			uint32_t use_ambient_cubemap = 0;
@@ -357,7 +357,7 @@ private:
 			uint32_t directional_light_count;
 			float z_far;
 			float z_near;
-			float pad1;
+			float IBL_exposure_normalization;
 
 			uint32_t fog_enabled;
 			float fog_density;
@@ -537,6 +537,16 @@ protected:
 
 	void _render_buffers_debug_draw(RID p_render_buffers, RID p_shadow_atlas, RID p_occlusion_buffer);
 
+	/* Camera Attributes */
+
+	struct CameraAttributes {
+		float exposure_multiplier = 1.0;
+		float exposure_normalization = 1.0;
+	};
+
+	bool use_physical_light_units = false;
+	mutable RID_Owner<CameraAttributes, true> camera_attributes_owner;
+
 	/* Environment */
 
 	RS::EnvironmentSSAOQuality ssao_quality = RS::ENV_SSAO_QUALITY_MEDIUM;
@@ -605,6 +615,7 @@ protected:
 		bool dirty = false;
 		int processing_layer = 0;
 		Sky *dirty_list = nullptr;
+		float baked_exposure = 1.0;
 
 		//State to track when radiance cubemap needs updating
 		GLES3::SkyMaterialData *prev_material;
@@ -615,12 +626,12 @@ protected:
 	Sky *dirty_sky_list = nullptr;
 	mutable RID_Owner<Sky, true> sky_owner;
 
-	void _setup_sky(RID p_env, RID p_render_buffers, const PagedArray<RID> &p_lights, const Projection &p_projection, const Transform3D &p_transform, const Size2i p_screen_size);
+	void _setup_sky(const RenderDataGLES3 *p_render_data, RID p_render_buffers, const PagedArray<RID> &p_lights, const Projection &p_projection, const Transform3D &p_transform, const Size2i p_screen_size);
 	void _invalidate_sky(Sky *p_sky);
 	void _update_dirty_skys();
-	void _update_sky_radiance(RID p_env, const Projection &p_projection, const Transform3D &p_transform);
+	void _update_sky_radiance(RID p_env, const Projection &p_projection, const Transform3D &p_transform, float p_luminance_multiplier);
 	void _filter_sky_radiance(Sky *p_sky, int p_base_layer);
-	void _draw_sky(RID p_env, const Projection &p_projection, const Transform3D &p_transform);
+	void _draw_sky(RID p_env, const Projection &p_projection, const Transform3D &p_transform, float p_luminance_multiplier);
 	void _free_sky_data(Sky *p_sky);
 
 public:
@@ -665,6 +676,7 @@ public:
 	void sky_set_mode(RID p_sky, RS::SkyMode p_mode) override;
 	void sky_set_material(RID p_sky, RID p_material) override;
 	Ref<Image> sky_bake_panorama(RID p_sky, float p_energy, bool p_bake_irradiance, const Size2i &p_size) override;
+	float sky_get_baked_exposure(RID p_sky) const;
 
 	/* ENVIRONMENT API */
 
@@ -686,13 +698,9 @@ public:
 
 	Ref<Image> environment_bake_panorama(RID p_env, bool p_bake_irradiance, const Size2i &p_size) override;
 
-	RID camera_effects_allocate() override;
-	void camera_effects_initialize(RID p_rid) override;
-	void camera_effects_set_dof_blur_quality(RS::DOFBlurQuality p_quality, bool p_use_jitter) override;
-	void camera_effects_set_dof_blur_bokeh_shape(RS::DOFBokehShape p_shape) override;
-
-	void camera_effects_set_dof_blur(RID p_camera_effects, bool p_far_enable, float p_far_distance, float p_far_transition, bool p_near_enable, float p_near_distance, float p_near_transition, float p_amount) override;
-	void camera_effects_set_custom_exposure(RID p_camera_effects, bool p_enable, float p_exposure) override;
+	_FORCE_INLINE_ bool is_using_physical_light_units() {
+		return use_physical_light_units;
+	}
 
 	void positional_soft_shadow_filter_set_quality(RS::ShadowQuality p_quality) override;
 	void directional_soft_shadow_filter_set_quality(RS::ShadowQuality p_quality) override;
@@ -743,7 +751,7 @@ public:
 
 	void voxel_gi_set_quality(RS::VoxelGIQuality) override;
 
-	void render_scene(RID p_render_buffers, const CameraData *p_camera_data, const CameraData *p_prev_camera_data, const PagedArray<RenderGeometryInstance *> &p_instances, const PagedArray<RID> &p_lights, const PagedArray<RID> &p_reflection_probes, const PagedArray<RID> &p_voxel_gi_instances, const PagedArray<RID> &p_decals, const PagedArray<RID> &p_lightmaps, const PagedArray<RID> &p_fog_volumes, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_occluder_debug_tex, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_mesh_lod_threshold, const RenderShadowData *p_render_shadows, int p_render_shadow_count, const RenderSDFGIData *p_render_sdfgi_regions, int p_render_sdfgi_region_count, const RenderSDFGIUpdateData *p_sdfgi_update_data = nullptr, RendererScene::RenderInfo *r_render_info = nullptr) override;
+	void render_scene(RID p_render_buffers, const CameraData *p_camera_data, const CameraData *p_prev_camera_data, const PagedArray<RenderGeometryInstance *> &p_instances, const PagedArray<RID> &p_lights, const PagedArray<RID> &p_reflection_probes, const PagedArray<RID> &p_voxel_gi_instances, const PagedArray<RID> &p_decals, const PagedArray<RID> &p_lightmaps, const PagedArray<RID> &p_fog_volumes, RID p_environment, RID p_camera_attributes, RID p_shadow_atlas, RID p_occluder_debug_tex, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_mesh_lod_threshold, const RenderShadowData *p_render_shadows, int p_render_shadow_count, const RenderSDFGIData *p_render_sdfgi_regions, int p_render_sdfgi_region_count, const RenderSDFGIUpdateData *p_sdfgi_update_data = nullptr, RendererScene::RenderInfo *r_render_info = nullptr) override;
 	void render_material(const Transform3D &p_cam_transform, const Projection &p_cam_projection, bool p_cam_orthogonal, const PagedArray<RenderGeometryInstance *> &p_instances, RID p_framebuffer, const Rect2i &p_region) override;
 	void render_particle_collider_heightfield(RID p_collider, const Transform3D &p_transform, const PagedArray<RenderGeometryInstance *> &p_instances) override;
 
diff --git a/drivers/gles3/shaders/sky.glsl b/drivers/gles3/shaders/sky.glsl
index eb1befe38e..21f01d2a8f 100644
--- a/drivers/gles3/shaders/sky.glsl
+++ b/drivers/gles3/shaders/sky.glsl
@@ -92,6 +92,7 @@ uniform mat4 orientation;
 uniform vec4 projection;
 uniform vec3 position;
 uniform float time;
+uniform float luminance_multiplier;
 
 uniform float fog_aerial_perspective;
 uniform vec3 fog_light_color;
@@ -149,6 +150,8 @@ void main() {
 
 	}
 
+	color *= luminance_multiplier;
+
 	// Convert to Linear for tonemapping so color matches scene shader better
 	color = srgb_to_linear(color);
 	color *= exposure;
diff --git a/drivers/gles3/storage/light_storage.cpp b/drivers/gles3/storage/light_storage.cpp
index 683716ca99..6411590aee 100644
--- a/drivers/gles3/storage/light_storage.cpp
+++ b/drivers/gles3/storage/light_storage.cpp
@@ -422,13 +422,17 @@ float LightStorage::reflection_probe_get_mesh_lod_threshold(RID p_probe) const {
 /* LIGHTMAP CAPTURE */
 
 RID LightStorage::lightmap_allocate() {
-	return RID();
+	return lightmap_owner.allocate_rid();
 }
 
 void LightStorage::lightmap_initialize(RID p_rid) {
+	lightmap_owner.initialize_rid(p_rid, Lightmap());
 }
 
 void LightStorage::lightmap_free(RID p_rid) {
+	Lightmap *lightmap = lightmap_owner.get_or_null(p_rid);
+	lightmap->dependency.deleted_notify(p_rid);
+	lightmap_owner.free(p_rid);
 }
 
 void LightStorage::lightmap_set_textures(RID p_lightmap, RID p_light, bool p_uses_spherical_haromics) {
@@ -443,6 +447,9 @@ void LightStorage::lightmap_set_probe_interior(RID p_lightmap, bool p_interior)
 void LightStorage::lightmap_set_probe_capture_data(RID p_lightmap, const PackedVector3Array &p_points, const PackedColorArray &p_point_sh, const PackedInt32Array &p_tetrahedra, const PackedInt32Array &p_bsp_tree) {
 }
 
+void LightStorage::lightmap_set_baked_exposure_normalization(RID p_lightmap, float p_exposure) {
+}
+
 PackedVector3Array LightStorage::lightmap_get_probe_capture_points(RID p_lightmap) const {
 	return PackedVector3Array();
 }
diff --git a/drivers/gles3/storage/light_storage.h b/drivers/gles3/storage/light_storage.h
index fa012a7b58..f054f0fdc6 100644
--- a/drivers/gles3/storage/light_storage.h
+++ b/drivers/gles3/storage/light_storage.h
@@ -92,6 +92,7 @@ struct ReflectionProbe {
 	bool enable_shadows = false;
 	uint32_t cull_mask = (1 << 20) - 1;
 	float mesh_lod_threshold = 0.01;
+	float baked_exposure = 1.0;
 
 	Dependency dependency;
 };
@@ -103,6 +104,7 @@ struct Lightmap {
 	bool uses_spherical_harmonics = false;
 	bool interior = false;
 	AABB bounds = AABB(Vector3(), Vector3(1, 1, 1));
+	float baked_exposure = 1.0;
 	int32_t array_index = -1; //unassigned
 	PackedVector3Array points;
 	PackedColorArray point_sh;
@@ -297,6 +299,9 @@ public:
 
 	/* LIGHTMAP CAPTURE */
 
+	Lightmap *get_lightmap(RID p_rid) { return lightmap_owner.get_or_null(p_rid); };
+	bool owns_lightmap(RID p_rid) { return lightmap_owner.owns(p_rid); };
+
 	virtual RID lightmap_allocate() override;
 	virtual void lightmap_initialize(RID p_rid) override;
 	virtual void lightmap_free(RID p_rid) override;
@@ -305,6 +310,7 @@ public:
 	virtual void lightmap_set_probe_bounds(RID p_lightmap, const AABB &p_bounds) override;
 	virtual void lightmap_set_probe_interior(RID p_lightmap, bool p_interior) override;
 	virtual void lightmap_set_probe_capture_data(RID p_lightmap, const PackedVector3Array &p_points, const PackedColorArray &p_point_sh, const PackedInt32Array &p_tetrahedra, const PackedInt32Array &p_bsp_tree) override;
+	virtual void lightmap_set_baked_exposure_normalization(RID p_lightmap, float p_exposure) override;
 	virtual PackedVector3Array lightmap_get_probe_capture_points(RID p_lightmap) const override;
 	virtual PackedColorArray lightmap_get_probe_capture_sh(RID p_lightmap) const override;
 	virtual PackedInt32Array lightmap_get_probe_capture_tetrahedra(RID p_lightmap) const override;
diff --git a/drivers/gles3/storage/utilities.cpp b/drivers/gles3/storage/utilities.cpp
index 654104722b..16bacf1829 100644
--- a/drivers/gles3/storage/utilities.cpp
+++ b/drivers/gles3/storage/utilities.cpp
@@ -82,6 +82,8 @@ RS::InstanceType Utilities::get_base_type(RID p_rid) const {
 		return RS::INSTANCE_MULTIMESH;
 	} else if (GLES3::LightStorage::get_singleton()->owns_light(p_rid)) {
 		return RS::INSTANCE_LIGHT;
+	} else if (GLES3::LightStorage::get_singleton()->owns_lightmap(p_rid)) {
+		return RS::INSTANCE_LIGHTMAP;
 	}
 	return RS::INSTANCE_NONE;
 }
@@ -114,6 +116,9 @@ bool Utilities::free(RID p_rid) {
 	} else if (GLES3::LightStorage::get_singleton()->owns_light(p_rid)) {
 		GLES3::LightStorage::get_singleton()->light_free(p_rid);
 		return true;
+	} else if (GLES3::LightStorage::get_singleton()->owns_lightmap(p_rid)) {
+		GLES3::LightStorage::get_singleton()->lightmap_free(p_rid);
+		return true;
 	} else {
 		return false;
 	}