106 lines
3.3 KiB
Plaintext
106 lines
3.3 KiB
Plaintext
#include "common.hlsl"
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ConstantBuffer<struct sh_shade_sig> sig : register(b0);
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/* ========================== *
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* Lighting
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* ========================== */
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#define SAMPLES 16
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#define MARCHES 16
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#define EDGE_FALLOFF 100
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float rand_angle(uint2 pos, uint ray_index) {
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Texture3D<uint> noise_tex = resource_from_urid(SH_BLUE_NOISE_TEX_ID);
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int3 noise_coord = int3(1, 1, 1);
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noise_coord += int3(pos.xy, ray_index);
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noise_coord.xyz += sig.frame_seed.xyz;
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// noise_coord.xy -= sig.camera_offset;
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uint noise = noise_tex[noise_coord % uint3(SH_BLUE_NOISE_TEX_WIDTH, SH_BLUE_NOISE_TEX_HEIGHT, SH_BLUE_NOISE_TEX_DEPTH)];
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return ((float)noise / (float)0xFFFF) * TAU;
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}
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INLINE float3 get_light_in_dir(uint2 ray_start, float2 ray_dir)
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{
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Texture2D<uint2> flood_tex = resource_from_urid(sig.emittance_flood_tex_urid);
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Texture2D<float4> emittance_tex = resource_from_urid(sig.emittance_tex_urid);
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float3 result = float3(0, 0, 0);
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float2 at_float = ray_start;
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uint2 at_uint = ray_start;
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for (uint i = 0; i < MARCHES; ++i) {
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uint2 flood = flood_tex[at_uint];
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float2 dist_vec = at_float - (float2)flood;
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float dist = length(dist_vec);
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if (dist < 1) {
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/* Scale light by distance from edge so that offscreen-lights fade in/out rather than popping in */
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float dist_x = min(abs(sig.tex_width - at_float.x), at_float.x);
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float dist_y = min(abs(sig.tex_height - at_float.y), at_float.y);
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float dist_scale = min(min(dist_x, dist_y) / EDGE_FALLOFF, 1);
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result = emittance_tex[flood].rgb * dist_scale;
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break;
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} else {
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at_float += ray_dir * dist;
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at_uint = round(at_float);
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if (at_uint.x < 0 || at_uint.x >= sig.tex_width || at_uint.y < 0 || at_uint.y >= sig.tex_height) {
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/* Ray hit edge of screen */
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break;
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}
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}
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}
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return result;
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}
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INLINE float3 get_light_at_pos(uint2 pos)
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{
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float3 result = 0;
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for (uint i = 0; i < SAMPLES; ++i) {
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float angle = rand_angle(pos, i);
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float2 dir = float2(cos(angle), sin(angle));
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float3 light_in_dir = get_light_in_dir(pos, dir);
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result += light_in_dir;
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}
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result /= SAMPLES;
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return result;
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}
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/* ========================== *
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* Entry point
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* ========================== */
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struct cs_input {
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DECLS(uint3, SV_DispatchThreadID);
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};
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[numthreads(8, 8, 1)]
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SH_ENTRY void cs(struct cs_input input)
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{
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uint2 id = input.SV_DispatchThreadID.xy;
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if (id.x < sig.tex_width && id.y < sig.tex_height) {
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Texture2D<float4> albedo_tex = resource_from_urid(sig.albedo_tex_urid);
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Texture2D<float4> read_tex = resource_from_urid(sig.read_tex_urid);
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RWTexture2D<float4> target_tex = resource_from_urid(sig.target_tex_urid);
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float4 color = float4(1, 1, 1, 1);
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/* Apply albedo */
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color *= albedo_tex[id];
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/* Apply lighting */
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if (!(sig.flags & SH_SHADE_FLAG_DISABLE_EFFECTS)) {
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color.rgb *= get_light_at_pos(id);
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}
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/* Apply temporal accumulation */
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float hysterisis = 0;
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// hysterisis = 0.2;
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// hysterisis = 0.4;
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// hysterisis = 0.5;
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// hysterisis = 0.9;
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color.rgb = lerp(color.rgb, read_tex[id].rgb, hysterisis);
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target_tex[id] = color;
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}
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}
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