Thomas Dinges
6b8bb26c45
Required by Metal backend for efficient shader compilation. EEVEE material resource binding permutations now controlled via CreateInfo and selected based on material options. Other existing CreateInfo's also modified to ensure explicitness for depth-writing mode. Other missing bindings also addressed to ensure full compliance with the Metal backend. Authored by Apple: Michael Parkin-White Ref T96261 Reviewed By: fclem Differential Revision: https://developer.blender.org/D16243
100 lines
2.6 KiB
GLSL
100 lines
2.6 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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const int resolve_samples_count = 9;
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const vec2 resolve_sample_offsets[36] = vec2[36](
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/* Set 1. */
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/* First Ring (2x2). */
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vec2(0, 0),
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/* Second Ring (6x6). */
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vec2(-1, 3),
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vec2(1, 3),
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vec2(-1, 1),
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vec2(3, 1),
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vec2(-2, 0),
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vec2(3, 0),
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vec2(2, -1),
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vec2(1, -2),
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/* Set 2. */
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/* First Ring (2x2). */
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vec2(1, 1),
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/* Second Ring (6x6). */
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vec2(-2, 3),
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vec2(3, 3),
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vec2(0, 2),
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vec2(2, 2),
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vec2(-2, -1),
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vec2(1, -1),
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vec2(0, -2),
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vec2(3, -2),
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/* Set 3. */
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/* First Ring (2x2). */
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vec2(0, 1),
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/* Second Ring (6x6). */
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vec2(0, 3),
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vec2(3, 2),
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vec2(-2, 1),
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vec2(2, 1),
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vec2(-1, 0),
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vec2(-2, -2),
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vec2(0, -1),
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vec2(2, -2),
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/* Set 4. */
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/* First Ring (2x2). */
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vec2(1, 0),
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/* Second Ring (6x6). */
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vec2(2, 3),
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vec2(-2, 2),
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vec2(-1, 2),
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vec2(1, 2),
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vec2(2, 0),
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vec2(-1, -1),
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vec2(3, -1),
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vec2(-1, -2));
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