Added normalmap guided roughness mipmap generator, and a global roughness limiter.

10 files changed, 233 insertions, 29 deletions

diff --git a/servers/visual/rasterizer_rd/rasterizer_effects_rd.cpp b/servers/visual/rasterizer_rd/rasterizer_effects_rd.cpp
index 4f8e8c6944..b775401496 100644
--- a/servers/visual/rasterizer_rd/rasterizer_effects_rd.cpp
+++ b/servers/visual/rasterizer_rd/rasterizer_effects_rd.cpp
@@ -664,7 +664,7 @@ void RasterizerEffectsRD::generate_ssao(RID p_depth_buffer, RID p_normal_buffer,
 	// Blur horizontal
 
 	ssao.blur_push_constant.edge_sharpness = p_edge_sharpness;
-	ssao.blur_push_constant.filter_scale = p_blur + 1;
+	ssao.blur_push_constant.filter_scale = p_blur;
 	ssao.blur_push_constant.screen_size[0] = ssao.gather_push_constant.screen_size[0];
 	ssao.blur_push_constant.screen_size[1] = ssao.gather_push_constant.screen_size[1];
 	ssao.blur_push_constant.z_far = p_projection.get_z_far();
@@ -673,33 +673,35 @@ void RasterizerEffectsRD::generate_ssao(RID p_depth_buffer, RID p_normal_buffer,
 	ssao.blur_push_constant.axis[0] = 1;
 	ssao.blur_push_constant.axis[1] = 0;
 
-	RD::get_singleton()->compute_list_bind_compute_pipeline(compute_list, ssao.pipelines[p_half_size ? SSAO_BLUR_PASS_HALF : SSAO_BLUR_PASS]);
-	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_ao1), 0);
-	if (p_half_size) {
-		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_depth_mipmaps_texture), 1);
-	} else {
-		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_depth_buffer), 1);
-	}
-	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_uniform_set_from_image(p_ao2), 3);
+	if (p_blur != VS::ENV_SSAO_BLUR_DISABLED) {
 
-	RD::get_singleton()->compute_list_set_push_constant(compute_list, &ssao.blur_push_constant, sizeof(SSAOBlurPushConstant));
+		RD::get_singleton()->compute_list_bind_compute_pipeline(compute_list, ssao.pipelines[p_half_size ? SSAO_BLUR_PASS_HALF : SSAO_BLUR_PASS]);
+		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_ao1), 0);
+		if (p_half_size) {
+			RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_depth_mipmaps_texture), 1);
+		} else {
+			RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_depth_buffer), 1);
+		}
+		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_uniform_set_from_image(p_ao2), 3);
 
-	RD::get_singleton()->compute_list_dispatch(compute_list, x_groups, y_groups, 1);
-	RD::get_singleton()->compute_list_add_barrier(compute_list);
+		RD::get_singleton()->compute_list_set_push_constant(compute_list, &ssao.blur_push_constant, sizeof(SSAOBlurPushConstant));
 
-	/* THIRD PASS */
-	// Blur vertical
+		RD::get_singleton()->compute_list_dispatch(compute_list, x_groups, y_groups, 1);
+		RD::get_singleton()->compute_list_add_barrier(compute_list);
 
-	ssao.blur_push_constant.axis[0] = 0;
-	ssao.blur_push_constant.axis[1] = 1;
+		/* THIRD PASS */
+		// Blur vertical
 
-	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_ao2), 0);
-	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_uniform_set_from_image(p_ao1), 3);
+		ssao.blur_push_constant.axis[0] = 0;
+		ssao.blur_push_constant.axis[1] = 1;
 
-	RD::get_singleton()->compute_list_set_push_constant(compute_list, &ssao.blur_push_constant, sizeof(SSAOBlurPushConstant));
+		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_ao2), 0);
+		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_uniform_set_from_image(p_ao1), 3);
 
-	RD::get_singleton()->compute_list_dispatch(compute_list, x_groups, y_groups, 1);
+		RD::get_singleton()->compute_list_set_push_constant(compute_list, &ssao.blur_push_constant, sizeof(SSAOBlurPushConstant));
 
+		RD::get_singleton()->compute_list_dispatch(compute_list, x_groups, y_groups, 1);
+	}
 	if (p_half_size) { //must upscale
 
 		/* FOURTH PASS */
@@ -727,6 +729,27 @@ void RasterizerEffectsRD::generate_ssao(RID p_depth_buffer, RID p_normal_buffer,
 	RD::get_singleton()->compute_list_end();
 }
 
+void RasterizerEffectsRD::roughness_limit(RID p_source_normal, RID p_roughness, const Size2i &p_size, float p_curve) {
+
+	roughness_limiter.push_constant.screen_size[0] = p_size.x;
+	roughness_limiter.push_constant.screen_size[1] = p_size.y;
+	roughness_limiter.push_constant.curve = p_curve;
+
+	RD::ComputeListID compute_list = RD::get_singleton()->compute_list_begin();
+	RD::get_singleton()->compute_list_bind_compute_pipeline(compute_list, roughness_limiter.pipeline);
+	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_compute_uniform_set_from_texture(p_source_normal), 0);
+	RD::get_singleton()->compute_list_bind_uniform_set(compute_list, _get_uniform_set_from_image(p_roughness), 1);
+
+	int x_groups = (p_size.x - 1) / 8 + 1;
+	int y_groups = (p_size.y - 1) / 8 + 1;
+
+	RD::get_singleton()->compute_list_set_push_constant(compute_list, &roughness_limiter.push_constant, sizeof(RoughnessLimiterPushConstant)); //not used but set anyway
+
+	RD::get_singleton()->compute_list_dispatch(compute_list, x_groups, y_groups, 1);
+
+	RD::get_singleton()->compute_list_end();
+}
+
 RasterizerEffectsRD::RasterizerEffectsRD() {
 
 	{
@@ -905,6 +928,19 @@ RasterizerEffectsRD::RasterizerEffectsRD() {
 
 		ERR_FAIL_COND(pipeline != SSAO_MAX);
 	}
+
+	{
+		// Initialize copier
+		Vector<String> shader_modes;
+		shader_modes.push_back("");
+
+		roughness_limiter.shader.initialize(shader_modes);
+
+		roughness_limiter.shader_version = roughness_limiter.shader.version_create();
+
+		roughness_limiter.pipeline = RD::get_singleton()->compute_pipeline_create(roughness_limiter.shader.version_get_shader(roughness_limiter.shader_version, 0));
+	}
+
 	RD::SamplerState sampler;
 	sampler.mag_filter = RD::SAMPLER_FILTER_LINEAR;
 	sampler.min_filter = RD::SAMPLER_FILTER_LINEAR;
diff --git a/servers/visual/rasterizer_rd/rasterizer_effects_rd.h b/servers/visual/rasterizer_rd/rasterizer_effects_rd.h
index 7a7d127e38..3495c9dcfe 100644
--- a/servers/visual/rasterizer_rd/rasterizer_effects_rd.h
+++ b/servers/visual/rasterizer_rd/rasterizer_effects_rd.h
@@ -38,6 +38,7 @@
 #include "servers/visual/rasterizer_rd/shaders/copy.glsl.gen.h"
 #include "servers/visual/rasterizer_rd/shaders/cubemap_roughness.glsl.gen.h"
 #include "servers/visual/rasterizer_rd/shaders/luminance_reduce.glsl.gen.h"
+#include "servers/visual/rasterizer_rd/shaders/roughness_limiter.glsl.gen.h"
 #include "servers/visual/rasterizer_rd/shaders/sky.glsl.gen.h"
 #include "servers/visual/rasterizer_rd/shaders/ssao.glsl.gen.h"
 #include "servers/visual/rasterizer_rd/shaders/ssao_blur.glsl.gen.h"
@@ -339,6 +340,21 @@ class RasterizerEffectsRD {
 		RID pipelines[SSAO_MAX];
 	} ssao;
 
+	struct RoughnessLimiterPushConstant {
+		int32_t screen_size[2];
+		float curve;
+		uint32_t pad;
+	};
+
+	struct RoughnessLimiter {
+
+		RoughnessLimiterPushConstant push_constant;
+		RoughnessLimiterShaderRD shader;
+		RID shader_version;
+		RID pipeline;
+
+	} roughness_limiter;
+
 	RID default_sampler;
 	RID default_mipmap_sampler;
 	RID index_buffer;
@@ -407,6 +423,8 @@ public:
 
 	void generate_ssao(RID p_depth_buffer, RID p_normal_buffer, const Size2i &p_depth_buffer_size, RID p_depth_mipmaps_texture, const Vector<RID> &depth_mipmaps, RID p_ao1, bool p_half_size, RID p_ao2, RID p_upscale_buffer, float p_intensity, float p_radius, float p_bias, const CameraMatrix &p_projection, VS::EnvironmentSSAOQuality p_quality, VS::EnvironmentSSAOBlur p_blur, float p_edge_sharpness);
 
+	void roughness_limit(RID p_source_normal, RID p_roughness, const Size2i &p_size, float p_curve);
+
 	RasterizerEffectsRD();
 	~RasterizerEffectsRD();
 };
diff --git a/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.cpp b/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.cpp
index 29aef6916e..ad6d689b69 100644
--- a/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.cpp
+++ b/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.cpp
@@ -260,6 +260,8 @@ void RasterizerSceneHighEndRD::ShaderData::set_code(const String &p_code) {
 	blend_state_blend.attachments.push_back(blend_attachment);
 	RD::PipelineColorBlendState blend_state_opaque = RD::PipelineColorBlendState::create_disabled(1);
 	RD::PipelineColorBlendState blend_state_opaque_specular = RD::PipelineColorBlendState::create_disabled(2);
+	RD::PipelineColorBlendState blend_state_depth_normal = RD::PipelineColorBlendState::create_disabled(1);
+	RD::PipelineColorBlendState blend_state_depth_normal_roughness = RD::PipelineColorBlendState::create_disabled(2);
 
 	//update pipelines
 
@@ -326,8 +328,10 @@ void RasterizerSceneHighEndRD::ShaderData::set_code(const String &p_code) {
 						blend_state = blend_state_opaque;
 					} else if (k == SHADER_VERSION_DEPTH_PASS || k == SHADER_VERSION_DEPTH_PASS_DP) {
 						//none, leave empty
-					} else if (k == SHADER_VERSION_DEPTH_PASS_WITH_NORMAL || k == SHADER_VERSION_DEPTH_PASS_WITH_NORMAL_AND_ROUGHNESS) {
-						blend_state = blend_state_opaque; //writes to normal and roughness in opaque way
+					} else if (k == SHADER_VERSION_DEPTH_PASS_WITH_NORMAL) {
+						blend_state = blend_state_depth_normal;
+					} else if (k == SHADER_VERSION_DEPTH_PASS_WITH_NORMAL_AND_ROUGHNESS) {
+						blend_state = blend_state_depth_normal;
 					} else if (k == SHADER_VERSION_DEPTH_PASS_WITH_MATERIAL) {
 						blend_state = RD::PipelineColorBlendState::create_disabled(5); //writes to normal and roughness in opaque way
 
@@ -941,7 +945,7 @@ void RasterizerSceneHighEndRD::_render_list(RenderingDevice::DrawListID p_draw_l
 	}
 }
 
-void RasterizerSceneHighEndRD::_setup_environment(RID p_environment, const CameraMatrix &p_cam_projection, const Transform &p_cam_transform, RID p_reflection_probe, bool p_no_fog, const Size2 &p_screen_pixel_size, RID p_shadow_atlas, bool p_flip_y, const Color &p_default_bg_color, float p_znear, float p_zfar) {
+void RasterizerSceneHighEndRD::_setup_environment(RID p_environment, const CameraMatrix &p_cam_projection, const Transform &p_cam_transform, RID p_reflection_probe, bool p_no_fog, const Size2 &p_screen_pixel_size, RID p_shadow_atlas, bool p_flip_y, const Color &p_default_bg_color, float p_znear, float p_zfar, bool p_opaque_render_buffers) {
 
 	//CameraMatrix projection = p_cam_projection;
 	//projection.flip_y(); // Vulkan and modern APIs use Y-Down
@@ -1031,7 +1035,7 @@ void RasterizerSceneHighEndRD::_setup_environment(RID p_environment, const Camer
 			scene_state.ubo.use_reflection_cubemap = false;
 		}
 
-		scene_state.ubo.ssao_enabled = environment_is_ssao_enabled(p_environment);
+		scene_state.ubo.ssao_enabled = p_opaque_render_buffers && environment_is_ssao_enabled(p_environment);
 		scene_state.ubo.ssao_ao_affect = environment_get_ssao_ao_affect(p_environment);
 		scene_state.ubo.ssao_light_affect = environment_get_ssao_light_affect(p_environment);
 
@@ -1059,6 +1063,8 @@ void RasterizerSceneHighEndRD::_setup_environment(RID p_environment, const Camer
 		scene_state.ubo.use_reflection_cubemap = false;
 	}
 
+	scene_state.ubo.roughness_limiter_enabled = p_opaque_render_buffers && screen_space_roughness_limiter_is_active();
+
 	RD::get_singleton()->buffer_update(scene_state.uniform_buffer, 0, sizeof(SceneState::UBO), &scene_state.ubo, true);
 }
 
@@ -1723,9 +1729,15 @@ void RasterizerSceneHighEndRD::_render_scene(RID p_render_buffer, const Transfor
 		screen_pixel_size.height = 1.0 / render_buffer->height;
 
 		opaque_framebuffer = render_buffer->color_fb;
+
 		if (p_environment.is_valid() && environment_is_ssr_enabled(p_environment)) {
 			depth_pass_mode = PASS_MODE_DEPTH_NORMAL_ROUGHNESS;
-		} else if (p_environment.is_valid() && environment_is_ssao_enabled(p_environment)) {
+		} else if (screen_space_roughness_limiter_is_active()) {
+			depth_pass_mode = PASS_MODE_DEPTH_NORMAL;
+			//we need to allocate both these, if not allocated
+			_allocate_normal_texture(render_buffer);
+			_allocate_roughness_texture(render_buffer);
+		} else if (p_environment.is_valid() && (environment_is_ssao_enabled(p_environment) || get_debug_draw_mode() == VS::VIEWPORT_DEBUG_DRAW_NORMAL_BUFFER)) {
 			depth_pass_mode = PASS_MODE_DEPTH_NORMAL;
 		}
 
@@ -1773,7 +1785,7 @@ void RasterizerSceneHighEndRD::_render_scene(RID p_render_buffer, const Transfor
 	_setup_lights(p_light_cull_result, p_light_cull_count, p_cam_transform.affine_inverse(), p_shadow_atlas, using_shadows);
 	_setup_reflections(p_reflection_probe_cull_result, p_reflection_probe_cull_count, p_cam_transform.affine_inverse(), p_environment);
 	_setup_gi_probes(p_gi_probe_cull_result, p_gi_probe_cull_count, p_cam_transform);
-	_setup_environment(p_environment, p_cam_projection, p_cam_transform, p_reflection_probe, p_reflection_probe.is_valid(), screen_pixel_size, p_shadow_atlas, !p_reflection_probe.is_valid(), p_default_bg_color, p_cam_projection.get_z_near(), p_cam_projection.get_z_far());
+	_setup_environment(p_environment, p_cam_projection, p_cam_transform, p_reflection_probe, p_reflection_probe.is_valid(), screen_pixel_size, p_shadow_atlas, !p_reflection_probe.is_valid(), p_default_bg_color, p_cam_projection.get_z_near(), p_cam_projection.get_z_far(), false);
 
 	cluster_builder.bake_cluster(); //bake to cluster
 
@@ -1855,12 +1867,18 @@ void RasterizerSceneHighEndRD::_render_scene(RID p_render_buffer, const Transfor
 		_process_ssao(p_render_buffer, p_environment, render_buffer->normal_buffer, p_cam_projection);
 	}
 
+	if (p_render_buffer.is_valid() && screen_space_roughness_limiter_is_active()) {
+		storage->get_effects()->roughness_limit(render_buffer->normal_buffer, render_buffer->roughness_buffer, Size2(render_buffer->width, render_buffer->height), screen_space_roughness_limiter_get_curve());
+	}
+
 	if (p_render_buffer.is_valid()) {
 		//update the render buffers uniform set in case it changed
 		_update_render_buffers_uniform_set(p_render_buffer);
 		render_buffers_uniform_set = render_buffer->uniform_set;
 	}
 
+	_setup_environment(p_environment, p_cam_projection, p_cam_transform, p_reflection_probe, p_reflection_probe.is_valid(), screen_pixel_size, p_shadow_atlas, !p_reflection_probe.is_valid(), p_default_bg_color, p_cam_projection.get_z_near(), p_cam_projection.get_z_far(), p_render_buffer.is_valid());
+
 	RENDER_TIMESTAMP("Render Opaque Pass");
 
 	{
@@ -1901,6 +1919,8 @@ void RasterizerSceneHighEndRD::_render_scene(RID p_render_buffer, const Transfor
 
 	RENDER_TIMESTAMP("Render Transparent Pass");
 
+	_setup_environment(p_environment, p_cam_projection, p_cam_transform, p_reflection_probe, p_reflection_probe.is_valid(), screen_pixel_size, p_shadow_atlas, !p_reflection_probe.is_valid(), p_default_bg_color, p_cam_projection.get_z_near(), p_cam_projection.get_z_far(), false);
+
 	render_list.sort_by_reverse_depth_and_priority(true);
 
 	_fill_instances(&render_list.elements[render_list.max_elements - render_list.alpha_element_count], render_list.alpha_element_count, false);
@@ -2275,6 +2295,18 @@ void RasterizerSceneHighEndRD::_render_buffers_uniform_set_changed(RID p_render_
 	_render_buffers_clear_uniform_set(rb);
 }
 
+RID RasterizerSceneHighEndRD::_render_buffers_get_roughness_texture(RID p_render_buffers) {
+	RenderBufferDataHighEnd *rb = (RenderBufferDataHighEnd *)render_buffers_get_data(p_render_buffers);
+
+	return rb->roughness_buffer;
+}
+
+RID RasterizerSceneHighEndRD::_render_buffers_get_normal_texture(RID p_render_buffers) {
+	RenderBufferDataHighEnd *rb = (RenderBufferDataHighEnd *)render_buffers_get_data(p_render_buffers);
+
+	return rb->normal_buffer;
+}
+
 void RasterizerSceneHighEndRD::_update_render_buffers_uniform_set(RID p_render_buffers) {
 
 	RenderBufferDataHighEnd *rb = (RenderBufferDataHighEnd *)render_buffers_get_data(p_render_buffers);
diff --git a/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.h b/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.h
index e4349919f6..ef90d3a283 100644
--- a/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.h
+++ b/servers/visual/rasterizer_rd/rasterizer_scene_high_end_rd.h
@@ -229,6 +229,8 @@ class RasterizerSceneHighEndRD : public RasterizerSceneRD {
 	virtual void _base_uniforms_changed();
 	void _render_buffers_clear_uniform_set(RenderBufferDataHighEnd *rb);
 	virtual void _render_buffers_uniform_set_changed(RID p_render_buffers);
+	virtual RID _render_buffers_get_roughness_texture(RID p_render_buffers);
+	virtual RID _render_buffers_get_normal_texture(RID p_render_buffers);
 
 	void _update_render_base_uniform_set();
 	void _setup_view_dependant_uniform_set(RID p_shadow_atlas, RID p_reflection_atlas);
@@ -347,7 +349,7 @@ class RasterizerSceneHighEndRD : public RasterizerSceneRD {
 			uint32_t ssao_enabled;
 			float ssao_light_affect;
 			float ssao_ao_affect;
-			uint32_t pad_ssao;
+			uint32_t roughness_limiter_enabled;
 
 			float ao_color[4];
 		};
@@ -555,7 +557,7 @@ class RasterizerSceneHighEndRD : public RasterizerSceneRD {
 		PASS_MODE_DEPTH_MATERIAL,
 	};
 
-	void _setup_environment(RID p_environment, const CameraMatrix &p_cam_projection, const Transform &p_cam_transform, RID p_reflection_probe, bool p_no_fog, const Size2 &p_screen_pixel_size, RID p_shadow_atlas, bool p_flip_y, const Color &p_default_bg_color, float p_znear, float p_zfar);
+	void _setup_environment(RID p_environment, const CameraMatrix &p_cam_projection, const Transform &p_cam_transform, RID p_reflection_probe, bool p_no_fog, const Size2 &p_screen_pixel_size, RID p_shadow_atlas, bool p_flip_y, const Color &p_default_bg_color, float p_znear, float p_zfar, bool p_opaque_render_buffers = false);
 	void _setup_lights(RID *p_light_cull_result, int p_light_cull_count, const Transform &p_camera_inverse_transform, RID p_shadow_atlas, bool p_using_shadows);
 	void _setup_reflections(RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, const Transform &p_camera_inverse_transform, RID p_environment);
 	void _setup_gi_probes(RID *p_gi_probe_probe_cull_result, int p_gi_probe_probe_cull_count, const Transform &p_camera_transform);
diff --git a/servers/visual/rasterizer_rd/rasterizer_scene_rd.cpp b/servers/visual/rasterizer_rd/rasterizer_scene_rd.cpp
index 41acd05a30..a40211726c 100644
--- a/servers/visual/rasterizer_rd/rasterizer_scene_rd.cpp
+++ b/servers/visual/rasterizer_rd/rasterizer_scene_rd.cpp
@@ -2640,6 +2640,16 @@ void RasterizerSceneRD::_render_buffers_debug_draw(RID p_render_buffers, RID p_s
 		RID ao_buf = rb->ssao.ao_full.is_valid() ? rb->ssao.ao_full : rb->ssao.ao[0];
 		effects->copy_to_rect(ao_buf, storage->render_target_get_rd_framebuffer(rb->render_target), Rect2(Vector2(), rtsize), false, true);
 	}
+
+	if (debug_draw == VS::VIEWPORT_DEBUG_DRAW_ROUGHNESS_LIMITER && _render_buffers_get_roughness_texture(p_render_buffers).is_valid()) {
+		Size2 rtsize = storage->render_target_get_size(rb->render_target);
+		effects->copy_to_rect(_render_buffers_get_roughness_texture(p_render_buffers), storage->render_target_get_rd_framebuffer(rb->render_target), Rect2(Vector2(), rtsize), false, true);
+	}
+
+	if (debug_draw == VS::VIEWPORT_DEBUG_DRAW_NORMAL_BUFFER && _render_buffers_get_normal_texture(p_render_buffers).is_valid()) {
+		Size2 rtsize = storage->render_target_get_size(rb->render_target);
+		effects->copy_to_rect(_render_buffers_get_normal_texture(p_render_buffers), storage->render_target_get_rd_framebuffer(rb->render_target), Rect2(Vector2(), rtsize));
+	}
 }
 
 RID RasterizerSceneRD::render_buffers_get_back_buffer_texture(RID p_render_buffers) {
@@ -2999,6 +3009,19 @@ void RasterizerSceneRD::set_time(double p_time, double p_step) {
 	time_step = p_step;
 }
 
+void RasterizerSceneRD::screen_space_roughness_limiter_set_active(bool p_enable, float p_curve) {
+	screen_space_roughness_limiter = p_enable;
+	screen_space_roughness_limiter_curve = p_curve;
+}
+
+bool RasterizerSceneRD::screen_space_roughness_limiter_is_active() const {
+	return screen_space_roughness_limiter;
+}
+
+float RasterizerSceneRD::screen_space_roughness_limiter_get_curve() const {
+	return screen_space_roughness_limiter_curve;
+}
+
 RasterizerSceneRD::RasterizerSceneRD(RasterizerStorageRD *p_storage) {
 	storage = p_storage;
 
@@ -3096,6 +3119,8 @@ RasterizerSceneRD::RasterizerSceneRD(RasterizerStorageRD *p_storage) {
 	camera_effects_set_dof_blur_bokeh_shape(VS::DOFBokehShape(int(GLOBAL_GET("rendering/quality/filters/depth_of_field_bokeh_shape"))));
 	camera_effects_set_dof_blur_quality(VS::DOFBlurQuality(int(GLOBAL_GET("rendering/quality/filters/depth_of_field_bokeh_quality"))), GLOBAL_GET("rendering/quality/filters/depth_of_field_use_jitter"));
 	environment_set_ssao_quality(VS::EnvironmentSSAOQuality(int(GLOBAL_GET("rendering/quality/ssao/quality"))), GLOBAL_GET("rendering/quality/ssao/half_size"));
+	screen_space_roughness_limiter = GLOBAL_GET("rendering/quality/filters/screen_space_roughness_limiter");
+	screen_space_roughness_limiter_curve = GLOBAL_GET("rendering/quality/filters/screen_space_roughness_limiter_curve");
 }
 
 RasterizerSceneRD::~RasterizerSceneRD() {
diff --git a/servers/visual/rasterizer_rd/rasterizer_scene_rd.h b/servers/visual/rasterizer_rd/rasterizer_scene_rd.h
index cb917482cc..2b519ce2f5 100644
--- a/servers/visual/rasterizer_rd/rasterizer_scene_rd.h
+++ b/servers/visual/rasterizer_rd/rasterizer_scene_rd.h
@@ -64,6 +64,8 @@ protected:
 
 	virtual void _base_uniforms_changed() = 0;
 	virtual void _render_buffers_uniform_set_changed(RID p_render_buffers) = 0;
+	virtual RID _render_buffers_get_roughness_texture(RID p_render_buffers) = 0;
+	virtual RID _render_buffers_get_normal_texture(RID p_render_buffers) = 0;
 
 	void _process_ssao(RID p_render_buffers, RID p_environment, RID p_normal_buffer, const CameraMatrix &p_projection);
 
@@ -575,6 +577,9 @@ private:
 		} ssao;
 	};
 
+	bool screen_space_roughness_limiter = false;
+	float screen_space_roughness_limiter_curve = 1.0;
+
 	mutable RID_Owner<RenderBuffers> render_buffers_owner;
 
 	void _free_render_buffer_data(RenderBuffers *rb);
@@ -923,6 +928,10 @@ public:
 	virtual void set_scene_pass(uint64_t p_pass) { scene_pass = p_pass; }
 	_FORCE_INLINE_ uint64_t get_scene_pass() { return scene_pass; }
 
+	virtual void screen_space_roughness_limiter_set_active(bool p_enable, float p_curve);
+	virtual bool screen_space_roughness_limiter_is_active() const;
+	virtual float screen_space_roughness_limiter_get_curve() const;
+
 	int get_roughness_layers() const;
 	bool is_using_radiance_cubemap_array() const;
 
diff --git a/servers/visual/rasterizer_rd/shaders/SCsub b/servers/visual/rasterizer_rd/shaders/SCsub
index 98c14144e9..9a28ef062c 100644
--- a/servers/visual/rasterizer_rd/shaders/SCsub
+++ b/servers/visual/rasterizer_rd/shaders/SCsub
@@ -19,3 +19,4 @@ if 'RD_GLSL' in env['BUILDERS']:
     env.RD_GLSL('ssao.glsl');
     env.RD_GLSL('ssao_minify.glsl');
     env.RD_GLSL('ssao_blur.glsl');
+    env.RD_GLSL('roughness_limiter.glsl');
diff --git a/servers/visual/rasterizer_rd/shaders/roughness_limiter.glsl b/servers/visual/rasterizer_rd/shaders/roughness_limiter.glsl
new file mode 100644
index 0000000000..5e0491c979
--- /dev/null
+++ b/servers/visual/rasterizer_rd/shaders/roughness_limiter.glsl
@@ -0,0 +1,73 @@
+/* clang-format off */
+[compute]
+/* clang-format on */
+
+#version 450
+
+VERSION_DEFINES
+
+layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
+
+
+layout(set = 0, binding = 0) uniform sampler2D source_normal;
+layout(r8, set = 1, binding = 0) uniform restrict writeonly image2D dest_roughness;
+
+layout(push_constant, binding = 1, std430) uniform Params {
+	ivec2 screen_size;
+	float curve;
+	uint pad;
+} params;
+
+#define HALF_PI 1.5707963267948966
+
+void main() {
+
+	// Pixel being shaded
+	ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
+	if (any(greaterThan(pos,params.screen_size))) { //too large, do nothing
+		return;
+	}
+
+	vec3 normal_accum = vec3(0.0);
+	float accum = 0.0;
+	for(int i=0;i<=1;i++) {
+		for(int j=0;j<=1;j++) {
+			normal_accum += normalize(texelFetch(source_normal,pos+ivec2(i,j),0).xyz * 2.0 - 1.0);
+			accum+=1.0;
+		}
+	}
+
+	normal_accum /= accum;
+
+	float r = length(normal_accum);
+
+	float limit;
+
+	if (r < 1.0) {
+		float threshold = 0.4;
+
+/*
+		//Formula from Filament, does not make sense to me.
+
+		float r2 = r * r;
+		float kappa = (3.0f * r - r * r2) / (1.0f - r2);
+		float variance = 0.25f / kappa;
+		limit = sqrt(min(2.0f * variance, threshold * threshold));
+//*/
+/*
+		//Formula based on probability distribution graph
+
+		float width = acos(max(0.0,r)); // convert to angle (width)
+		float roughness = pow(width,1.7)*0.854492; //approximate (crappy) formula to convert to roughness
+		limit = min(sqrt(roughness), threshold); //convert to perceptual roughness and apply threshold
+//*/
+
+		limit = min(sqrt(pow(acos(max(0.0,r)) / HALF_PI ,params.curve)), threshold); //convert to perceptual roughness and apply threshold
+
+		//limit = 0.5;
+	} else {
+		limit = 0.0;
+	}
+
+	imageStore(dest_roughness,pos,vec4(limit));
+}
diff --git a/servers/visual/rasterizer_rd/shaders/scene_high_end.glsl b/servers/visual/rasterizer_rd/shaders/scene_high_end.glsl
index 66ce4b466f..8aee680c1e 100644
--- a/servers/visual/rasterizer_rd/shaders/scene_high_end.glsl
+++ b/servers/visual/rasterizer_rd/shaders/scene_high_end.glsl
@@ -1272,6 +1272,7 @@ FRAGMENT_SHADER_CODE
 
 #endif // !USE_SHADOW_TO_OPACITY
 
+
 #if defined(NORMALMAP_USED)
 
 	normalmap.xy = normalmap.xy * 2.0 - 1.0;
@@ -1310,6 +1311,13 @@ FRAGMENT_SHADER_CODE
 
 #if !defined(MODE_RENDER_DEPTH) && !defined(MODE_UNSHADED)
 
+	if (scene_data.roughness_limiter_enabled) {
+		float limit = texelFetch(sampler2D(roughness_buffer, material_samplers[SAMPLER_NEAREST_CLAMP]),ivec2(gl_FragCoord.xy),0).r;
+		roughness = max(roughness,limit);
+
+	}
+
+
 	if (scene_data.use_reflection_cubemap) {
 
 		vec3 ref_vec = reflect(-view, normal);
diff --git a/servers/visual/rasterizer_rd/shaders/scene_high_end_inc.glsl b/servers/visual/rasterizer_rd/shaders/scene_high_end_inc.glsl
index 5504d0fc2f..384e51bbce 100644
--- a/servers/visual/rasterizer_rd/shaders/scene_high_end_inc.glsl
+++ b/servers/visual/rasterizer_rd/shaders/scene_high_end_inc.glsl
@@ -63,7 +63,7 @@ layout(set = 0, binding = 3, std140) uniform SceneData {
 	bool ssao_enabled;
 	float ssao_light_affect;
 	float ssao_ao_affect;
-	uint pad_ssao;
+	bool roughness_limiter_enabled;
 
 	vec4 ao_color;