rendering: thread global shader keywords into builtin variants

engine/assets/builtin/shaders/forward-lit/forward-lit.frag.glsl

@@ -43,6 +43,9 @@ in vec3 vPositionWS;
 layout(location = 0) out vec4 fragColor;
 
 float ComputeShadowAttenuation(vec3 positionWS) {
+#ifndef XC_MAIN_LIGHT_SHADOWS
+    return 1.0;
+#else
     if (gShadowOptions.x < 0.5) {
         return 1.0;
     }
@@ -66,6 +69,7 @@ float ComputeShadowAttenuation(vec3 positionWS) {
     float receiverDepth = shadowNdc.z * 0.5 + 0.5 - gShadowBiasAndTexelSize.x;
     float shadowStrength = clamp(gShadowBiasAndTexelSize.w, 0.0, 1.0);
     return receiverDepth <= shadowDepth ? 1.0 : (1.0 - shadowStrength);
+#endif
 }
 
 float ComputeRangeAttenuation(float distanceSq, float range) {

engine/assets/builtin/shaders/forward-lit/forward-lit.frag.vk.glsl

@@ -45,6 +45,9 @@ layout(location = 2) in vec3 vPositionWS;
 layout(location = 0) out vec4 fragColor;
 
 float ComputeShadowAttenuation(vec3 positionWS) {
+#ifndef XC_MAIN_LIGHT_SHADOWS
+    return 1.0;
+#else
     if (gShadowOptions.x < 0.5) {
         return 1.0;
     }
@@ -68,6 +71,7 @@ float ComputeShadowAttenuation(vec3 positionWS) {
     float receiverDepth = shadowNdc.z - gShadowBiasAndTexelSize.x;
     float shadowStrength = clamp(gShadowBiasAndTexelSize.w, 0.0, 1.0);
     return receiverDepth <= shadowDepth ? 1.0 : (1.0 - shadowStrength);
+#endif
 }
 
 float ComputeRangeAttenuation(float distanceSq, float range) {

engine/assets/builtin/shaders/forward-lit/forward-lit.ps.hlsl

@@ -45,6 +45,9 @@ struct PSInput {
 };
 
 float ComputeShadowAttenuation(float3 positionWS) {
+#ifndef XC_MAIN_LIGHT_SHADOWS
+    return 1.0f;
+#else
     if (gShadowOptions.x < 0.5f) {
         return 1.0f;
     }
@@ -68,6 +71,7 @@ float ComputeShadowAttenuation(float3 positionWS) {
     const float receiverDepth = shadowNdc.z - gShadowBiasAndTexelSize.x;
     const float shadowStrength = saturate(gShadowBiasAndTexelSize.w);
     return receiverDepth <= shadowDepth ? 1.0f : (1.0f - shadowStrength);
+#endif
 }
 
 float ComputeRangeAttenuation(float distanceSq, float range) {

engine/assets/builtin/shaders/forward-lit/forward-lit.shader

@@ -25,6 +25,7 @@ Shader "Builtin Forward Lit"
             HLSLPROGRAM
             #pragma vertex MainVS
             #pragma fragment MainPS
+            #pragma multi_compile _ XC_MAIN_LIGHT_SHADOWS
             #pragma backend D3D12 HLSL "forward-lit.vs.hlsl" "forward-lit.ps.hlsl" vs_5_0 ps_5_0
             #pragma backend OpenGL GLSL "forward-lit.vert.glsl" "forward-lit.frag.glsl"
             #pragma backend Vulkan GLSL "forward-lit.vert.vk.glsl" "forward-lit.frag.vk.glsl"