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Mobile devices are typically bandwidth bound which means we need to do as few texture samples as possible. They typically use TBDR GPUs which means that all rendering takes place on special optimized tiles. As a side effect, reading back memory from tile to VRAM is really slow, especially on Mali devices. This commit uses a technique where you do a small blur while downsampling, and then another small blur while upsampling to get really high quality glow. While this doesn't reduce the renderpass count very much, it does reduce the texture read bandwidth by almost 10 times. Overall glow was more texture-read bound than memory write, bound, so this was a huge win. A side effect of this new technique is that we can gather the glow as we upsample instead of gathering the glow in the final tonemap pass. Doing so allows us to significantly reduce the cost of the tonemap pass as well.
115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
/**************************************************************************/
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/* smaa.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#pragma once
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#include "servers/rendering/renderer_rd/pipeline_cache_rd.h"
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#include "servers/rendering/renderer_rd/shaders/effects/smaa_blending.glsl.gen.h"
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#include "servers/rendering/renderer_rd/shaders/effects/smaa_edge_detection.glsl.gen.h"
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#include "servers/rendering/renderer_rd/shaders/effects/smaa_weight_calculation.glsl.gen.h"
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#include "servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.h"
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#include "servers/rendering/renderer_scene_render.h"
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#include "servers/rendering/rendering_server.h"
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#define RB_SCOPE_SMAA SNAME("rb_smaa")
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#define RB_EDGES SNAME("edges")
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#define RB_BLEND SNAME("blend")
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#define RB_STENCIL SNAME("stencil")
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namespace RendererRD {
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class SMAA {
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private:
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enum SMAAMode {
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SMAA_EDGE_DETECTION_COLOR,
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SMAA_WEIGHT_FULL,
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SMAA_BLENDING,
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SMAA_MAX,
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};
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struct SMAAEdgePushConstant {
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float inv_size[2];
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float threshold;
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float pad;
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};
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struct SMAAWeightPushConstant {
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float inv_size[2];
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uint32_t size[2];
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float subsample_indices[4];
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};
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struct SMAABlendPushConstant {
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float inv_size[2];
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uint32_t use_debanding;
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float pad;
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};
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enum SMAABlendFlags {
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SMAA_BLEND_FLAG_USE_8_BIT_DEBANDING = (1 << 0),
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SMAA_BLEND_FLAG_USE_10_BIT_DEBANDING = (1 << 1),
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};
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struct SMAAEffect {
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SMAAEdgePushConstant edge_push_constant;
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SmaaEdgeDetectionShaderRD edge_shader;
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RID edge_shader_version;
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SMAAWeightPushConstant weight_push_constant;
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SmaaWeightCalculationShaderRD weight_shader;
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RID weight_shader_version;
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SMAABlendPushConstant blend_push_constant;
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SmaaBlendingShaderRD blend_shader;
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RID blend_shader_version;
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RID search_tex;
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RID area_tex;
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RD::DataFormat stencil_format;
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PipelineCacheRD pipelines[SMAA_MAX];
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} smaa;
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float edge_detection_threshold;
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public:
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SMAA();
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~SMAA();
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void allocate_render_targets(Ref<RenderSceneBuffersRD> p_render_buffers);
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void process(Ref<RenderSceneBuffersRD> p_render_buffers, RID p_source_color, RID p_dst_framebuffer, bool p_use_debanding);
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};
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} // namespace RendererRD
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