96 lines
3.2 KiB
HLSL
96 lines
3.2 KiB
HLSL
#include "sh/common.hlsl"
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/* ========================== *
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* Root signature
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* ========================== */
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#define ROOTSIG \
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"RootConstants(num32BitConstants = 7, b0), " \
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"DescriptorTable(SRV(t0, space = 0, numDescriptors = unbounded, flags = DESCRIPTORS_VOLATILE)), " \
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"DescriptorTable(SRV(t0, space = 1, numDescriptors = unbounded, flags = DESCRIPTORS_VOLATILE)), " \
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"DescriptorTable(UAV(u0, space = 2, numDescriptors = unbounded, flags = DESCRIPTORS_VOLATILE)), " \
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\
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\
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"StaticSampler(s0, " \
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"filter = FILTER_MIN_MAG_MIP_POINT, " \
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"addressU = TEXTURE_ADDRESS_CLAMP, " \
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"addressV = TEXTURE_ADDRESS_CLAMP, " \
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"addressW = TEXTURE_ADDRESS_CLAMP, " \
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"maxAnisotropy = 1)"
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ConstantBuffer<struct sh_shade_constants> g_constants : register(b0);
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Texture2D<float4> g_gbuff_textures[] : register(t0, space0);
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Texture2D<uint2> g_emittance_flood_textures[] : register(t0, space1);
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RWTexture2D<float4> g_write_textures[]: register(u0, space2);
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SamplerState g_sampler : register(s0);
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/* ========================== *
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* Compute shader
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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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#define SAMPLES 4
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#define MARCHES 16
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INLINE float4 get_light_in_dir(uint2 pos, float2 dir)
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{
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float4 result = 0;
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uint2 at = pos;
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for (uint i = 0; i < MARCHES; ++i) {
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uint2 flood = g_emittance_flood_textures[g_constants.emittance_flood_tex_urid][at];
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int2 dist_vec = (int2)at - (int2)flood;
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float dist = length(dist_vec);
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if (dist < 2) {
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result = g_gbuff_textures[g_constants.emittance_tex_urid][flood];
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break;
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} else {
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at += dir * dist;
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}
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}
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return result;
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}
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float rand_float_from_float2(float2 pos) {
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return frac(sin(dot(pos.xy, float2(12.9898,78.233))) * 43758.5453123);
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}
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INLINE float4 get_light_at_pos(uint2 pos)
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{
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float4 result = 0;
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for (int i = 0; i < SAMPLES; ++i) {
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float angle = TAU * (((float)i + rand_float_from_float2(pos + (float)i + sin(g_constants.time))) / ((float)SAMPLES - 1));
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float2 dir = float2(sin(angle), cos(angle));
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float4 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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// float4 emittance = g_gbuff_textures[g_constants.emittance_tex_urid][pos];
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// uint2 emittance_flood = g_emittance_flood_textures[g_constants.emittance_flood_tex_urid][pos];
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// emittance_flood *= (emittance_flood.x < 0xFFFF && emittance_flood.y < 0xFFFF);
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// return float4(float(emittance_flood.x) / float(g_constants.tex_width), float(emittance_flood.y) / float(g_constants.tex_height), 0, 1);
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}
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[numthreads(8, 8, 1)]
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SH_ENTRY(ROOTSIG) 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 >= g_constants.tex_width || id.y >= g_constants.tex_height) {
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return; /* Overflow */
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}
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float4 old_color = g_gbuff_textures[g_constants.write_tex_urid][id];
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float4 albedo = g_gbuff_textures[g_constants.albedo_tex_urid][id];
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float4 lighting = get_light_at_pos(id);
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float4 final_color = old_color + albedo + lighting;
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g_write_textures[g_constants.write_tex_urid][id] = final_color;
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}
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