Implementing light range support in Metal

colincornaby · Nov 27, 2024 · 6ae48c1 · 6ae48c1
1 parent 5cdc425
commit 6ae48c1
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diff --git a/Sources/Plasma/FeatureLib/pfMetalPipeline/ShaderSrc/FixedPipelineShaders.metal b/Sources/Plasma/FeatureLib/pfMetalPipeline/ShaderSrc/FixedPipelineShaders.metal
@@ -212,6 +212,11 @@ vertex ColorInOut pipelineVertexShader(Vertex in [[stage_in]],
             // Omni Light in all directions
             const float3 v2l = lightSource->position.xyz - position.xyz;
             const float distance = length(v2l);
+
+            if (distance > lightSource->range) {
+                continue;
+            }
+
             direction.xyz = normalize(v2l);
 
             direction.w = 1.f / (lightSource->constAtten + lightSource->linAtten * distance + lightSource->quadAtten * pow(distance, 2.f));

diff --git a/Sources/Plasma/FeatureLib/pfMetalPipeline/ShaderSrc/ShaderTypes.h b/Sources/Plasma/FeatureLib/pfMetalPipeline/ShaderSrc/ShaderTypes.h
@@ -150,6 +150,7 @@ struct plMetalShaderLightSource
     half4 specular;
     simd::float3 direction;
     simd::float4 spotProps; // (falloff, theta, phi)
+    __fp16 range;
     __fp16 constAtten;
     __fp16 linAtten;
     __fp16 quadAtten;

diff --git a/Sources/Plasma/FeatureLib/pfMetalPipeline/plMetalPipeline.cpp b/Sources/Plasma/FeatureLib/pfMetalPipeline/plMetalPipeline.cpp
@@ -2374,6 +2374,8 @@ void plMetalPipeline::IEnableLight(size_t i, plLightInfo* light)
     plDirectionalLightInfo* dirLight = nullptr;
     plOmniLightInfo*        omniLight = nullptr;
     plSpotLightInfo*        spotLight = nullptr;
+
+    const float             maxRange = 32767.f;
 
     if ((dirLight = plDirectionalLightInfo::ConvertNoRef(light)) != nullptr) {
         hsVector3 lightDir = dirLight->GetWorldDirection();
@@ -2383,6 +2385,9 @@ void plMetalPipeline::IEnableLight(size_t i, plLightInfo* light)
         fLights.lampSources[i].constAtten = 1.0f;
         fLights.lampSources[i].linAtten = 0.0f;
         fLights.lampSources[i].quadAtten = 0.0f;
+
+        fLights.lampSources[i].range = maxRange;
+
     } else if ((omniLight = plOmniLightInfo::ConvertNoRef(light)) != nullptr) {
         hsPoint3 pos = omniLight->GetWorldPosition();
         fLights.lampSources[i].position = {pos.fX, pos.fY, pos.fZ, 1.0};
@@ -2392,6 +2397,8 @@ void plMetalPipeline::IEnableLight(size_t i, plLightInfo* light)
         fLights.lampSources[i].constAtten = omniLight->GetConstantAttenuation();
         fLights.lampSources[i].linAtten = omniLight->GetLinearAttenuation();
         fLights.lampSources[i].quadAtten = omniLight->GetQuadraticAttenuation();
+
+        fLights.lampSources[i].range = omniLight->GetRadius();
 
         if (!omniLight->GetProjection() && (spotLight = plSpotLightInfo::ConvertNoRef(omniLight)) != nullptr) {
             hsVector3 lightDir = spotLight->GetWorldDirection();