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https://github.com/MaSzyna-EU07/maszyna.git
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88 lines
3.4 KiB
HLSL
88 lines
3.4 KiB
HLSL
#ifndef SHADOW_HLSLI
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#define SHADOW_HLSLI
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#include "view_data.hlsli"
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#include "material_common.hlsli"
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#define CASCADE_COUNT 8
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cbuffer ShadowProjections : register(b11) {
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float4x4 g_CascadeProjections[CASCADE_COUNT];
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float4 g_CascadePlanes[(CASCADE_COUNT + 3) / 4];
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}
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SamplerComparisonState g_ShadowSampler : register(s11);
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Texture2DArray<float> g_ShadowMap : register(t11);
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float3 PosToShadow(in float4x4 cascade, in float3 pos) {
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float4 shadow_view = mul(cascade, float4(pos, 1.));
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shadow_view /= shadow_view.w;
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shadow_view.xy = shadow_view.xy * float2(.5, -.5) + .5;
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return shadow_view.xyz;
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}
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bool CalculateShadowView(in float4x4 cascade, in float plane, in MaterialData data, out float3 shadow_view, out float3 shadow_view_ddx, out float3 shadow_view_ddy) {
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#ifdef DEFERRED_LIGHTING_PASS
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if(dot(data.m_Position, data.m_Position) > plane) return false;
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shadow_view = PosToShadow(cascade, data.m_Position);
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shadow_view_ddx = PosToShadow(cascade, data.m_PositionDDX) - shadow_view;
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shadow_view_ddy = PosToShadow(cascade, data.m_PositionDDY) - shadow_view;
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return true;
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#else
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if(dot(data.m_Position, data.m_Position) > plane) return false;
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shadow_view = PosToShadow(cascade, data.m_Position);
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//if(any(shadow_view <= 0. || shadow_view >= 1.)) return false;
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//shadow_view_ddx = PosToShadow(cascade, data.m_Position + ddx(data.m_Position)) - shadow_view;
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//shadow_view_ddy = PosToShadow(cascade, data.m_Position + ddy(data.m_Position)) - shadow_view;
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return true;
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#endif
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}
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float GetShadow(in float3 view, in MaterialData data) {
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float shadow = 1.;
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uint3 shadowmap_size;
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g_ShadowMap.GetDimensions(shadowmap_size.x, shadowmap_size.y, shadowmap_size.z);
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for(int i = 0; i < shadowmap_size.z; ++i) {
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float3 shadowView, vShadowTexDDX, vShadowTexDDY;
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if(CalculateShadowView(mul(g_CascadeProjections[i], g_InverseModelView), g_CascadePlanes[i / 4][i % 4], data, shadowView, vShadowTexDDX, vShadowTexDDY)) {
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shadow = 0.;
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#ifdef DEFERRED_LIGHTING_PASS
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float2x2 screenToShadow = float2x2(vShadowTexDDX.xy, vShadowTexDDY.xy);
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float fDeterminant = determinant(screenToShadow);
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float fInvDeterminant = 1.0f / fDeterminant;
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float2x2 shadowToScreen = float2x2 (
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screenToShadow._22 * fInvDeterminant,
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screenToShadow._12 * -fInvDeterminant,
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screenToShadow._21 * -fInvDeterminant,
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screenToShadow._11 * fInvDeterminant );
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float2 vRightTexelDepthRatio = mul( float2(1./shadowmap_size.x, 0.),
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shadowToScreen );
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float2 vUpTexelDepthRatio = mul( float2(0., 1./shadowmap_size.y),
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shadowToScreen );
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float fUpTexelDepthDelta =
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vUpTexelDepthRatio.x * vShadowTexDDX.z
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+ vUpTexelDepthRatio.y * vShadowTexDDY.z;
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float fRightTexelDepthDelta =
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vRightTexelDepthRatio.x * vShadowTexDDX.z
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+ vRightTexelDepthRatio.y * vShadowTexDDY.z;
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#endif
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[unroll]
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for (int y = -1; y <= 1; ++y) {
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[unroll]
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for (int x = -1; x <= 1; ++x) {
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#ifdef DEFERRED_LIGHTING_PASS
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shadow += g_ShadowMap.SampleCmpLevelZero(g_ShadowSampler, float3(shadowView.xy, float(i)), shadowView.z + x * fRightTexelDepthDelta + y * fUpTexelDepthDelta, int2(x, y)) / 9.;
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#else
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shadow += g_ShadowMap.SampleCmpLevelZero(g_ShadowSampler, float3(shadowView.xy, float(i)), shadowView.z, int2(x, y)) / 9.;
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#endif
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}
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}
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break;
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}
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}
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return shadow;
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}
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#endif
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