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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.
87 lines
3.6 KiB
C++
87 lines
3.6 KiB
C++
/**************************************************************************/
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/* glow.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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#ifdef GLES3_ENABLED
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#include "drivers/gles3/shaders/effects/glow.glsl.gen.h"
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namespace GLES3 {
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class Glow {
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private:
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static Glow *singleton;
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struct GLOW {
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GlowShaderGLES3 shader;
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RID shader_version;
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} glow;
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float luminance_multiplier = 1.0;
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float glow_intensity = 1.0;
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float glow_bloom = 0.0;
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float glow_hdr_bleed_threshold = 0.0;
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float glow_hdr_bleed_scale = 2.0;
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float glow_hdr_luminance_cap = 12.0;
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// Use for full-screen effects. Slightly more efficient than screen_quad as this eliminates pixel overdraw along the diagonal.
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GLuint screen_triangle = 0;
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GLuint screen_triangle_array = 0;
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void _draw_screen_triangle();
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public:
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struct GLOWLEVEL {
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Size2i size;
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GLuint color = 0;
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GLuint fbo = 0;
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};
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static Glow *get_singleton();
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Glow();
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~Glow();
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void set_intensity(float p_value) { glow_intensity = p_value; }
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void set_luminance_multiplier(float p_luminance_multiplier) { luminance_multiplier = p_luminance_multiplier; }
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void set_glow_bloom(float p_bloom) { glow_bloom = p_bloom; }
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void set_glow_hdr_bleed_threshold(float p_threshold) { glow_hdr_bleed_threshold = p_threshold; }
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void set_glow_hdr_bleed_scale(float p_scale) { glow_hdr_bleed_scale = p_scale; }
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void set_glow_hdr_luminance_cap(float p_cap) { glow_hdr_luminance_cap = p_cap; }
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void process_glow(GLuint p_source_color, Size2i p_size, const GLOWLEVEL *p_glow_buffers, uint32_t p_view = 0, bool p_use_multiview = false);
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};
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} //namespace GLES3
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#endif // GLES3_ENABLED
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