3535670ff1
Global scope arrays can incur suboptimal per-shader-thread memory allocations, resulting in excessive usage of limited local memory resources. These changes ensure that any arrays are limited to the closest scope in which they are required and thus will get correctly optimized by the compiler. A number of constants have also been replaced with Macro's as these can result in better runtime performance for complex shader code. Authored by Apple: Michael Parkin-White Ref T96261 Reviewed By: fclem Maniphest Tasks: T96261 Differential Revision: https://developer.blender.org/D16825
50 lines
1.7 KiB
GLSL
50 lines
1.7 KiB
GLSL
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#pragma BLENDER_REQUIRE(common_view_lib.glsl)
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/* Based on:
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* "Stochastic Screen Space Reflections"
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* by Tomasz Stachowiak.
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* https://www.ea.com/frostbite/news/stochastic-screen-space-reflections
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* and
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* "Stochastic all the things: raytracing in hybrid real-time rendering"
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* by Tomasz Stachowiak.
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* https://media.contentapi.ea.com/content/dam/ea/seed/presentations/dd18-seed-raytracing-in-hybrid-real-time-rendering.pdf
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*/
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struct HitData {
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/** Hit direction scaled by intersection time. */
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vec3 hit_dir;
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/** Screen space [0..1] depth of the reflection hit position, or -1.0 for planar reflections. */
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float hit_depth;
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/** Inverse probability of ray spawning in this direction. */
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float ray_pdf_inv;
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/** True if ray has hit valid geometry. */
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bool is_hit;
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/** True if ray was generated from a planar reflection probe. */
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bool is_planar;
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};
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void encode_hit_data(HitData data, vec3 hit_sP, vec3 vP, out vec4 hit_data, out float hit_depth)
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{
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vec3 hit_vP = get_view_space_from_depth(hit_sP.xy, hit_sP.z);
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hit_data.xyz = hit_vP - vP;
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hit_depth = data.is_planar ? -1.0 : hit_sP.z;
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/* Record 1.0 / pdf to reduce the computation in the resolve phase. */
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/* Encode hit validity in sign. */
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hit_data.w = data.ray_pdf_inv * ((data.is_hit) ? 1.0 : -1.0);
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}
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HitData decode_hit_data(vec4 hit_data, float hit_depth)
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{
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HitData data;
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data.hit_dir.xyz = hit_data.xyz;
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data.hit_depth = hit_depth;
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data.is_planar = (hit_depth == -1.0);
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data.ray_pdf_inv = abs(hit_data.w);
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data.is_hit = (hit_data.w > 0.0);
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return data;
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}
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/* Blue noise categorized into 4 sets of samples.
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* See "Stochastic all the things" presentation slide 32-37. */
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#define resolve_samples_count 9 |