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[Examples] Ported HelloGame example to Metal.
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// Metal shader for HelloGame example | ||
// This file is part of the LLGL project | ||
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#include <metal_stdlib> | ||
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using namespace metal; | ||
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struct Scene | ||
{ | ||
float4x4 vpMatrix; | ||
float4x4 vpShadowMatrix; | ||
packed_float3 lightDir; | ||
float shininess; | ||
packed_float3 viewPos; | ||
float shadowSizeInv; | ||
packed_float3 warpCenter; | ||
float warpIntensity; | ||
packed_float3 bendDir; | ||
float ambientItensity; | ||
packed_float3 groundTint; | ||
float groundScale; | ||
packed_float3 lightColor; | ||
float warpScaleInv; | ||
}; | ||
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struct Instance | ||
{ | ||
float4 wMatrixRow0; | ||
float4 wMatrixRow1; | ||
float4 wMatrixRow2; | ||
float4 color; | ||
}; | ||
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// VERTEX SHADER INSTANCE | ||
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struct Globals | ||
{ | ||
float3 worldOffset; | ||
float bendIntensity; | ||
uint firstInstance; | ||
}; | ||
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struct VertexIn | ||
{ | ||
float3 position [[attribute(0)]]; | ||
float3 normal [[attribute(1)]]; | ||
float2 texCoord [[attribute(2)]]; | ||
}; | ||
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struct VertexOut | ||
{ | ||
float4 position [[position]]; | ||
float3 worldPos; | ||
float3 normal; | ||
float2 texCoord; | ||
float4 color; | ||
}; | ||
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float WarpIntensityCurve(float d, float warpScaleInv) | ||
{ | ||
return 1.0/(1.0 + d*d*warpScaleInv); | ||
} | ||
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float3 MeshAnimation(float3 pos, float3 bendDir, float bendIntensity) | ||
{ | ||
return pos + bendDir * pos.y * bendIntensity; | ||
} | ||
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float3 WarpPosition(constant Scene& scene, float3 pos) | ||
{ | ||
float3 dir = pos - scene.warpCenter; | ||
float dirLen = length(dir); | ||
float intensity = WarpIntensityCurve(dirLen, scene.warpScaleInv); | ||
return pos + normalize(dir) * intensity * scene.warpIntensity; | ||
} | ||
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// Unpacks three float4 matrix rows to mimic D3D's compact matrix memory layout | ||
float4x3 UnpackRowMajor3x4Matrix(float4 row0, float4 row1, float4 row2) | ||
{ | ||
return float4x3( | ||
float3(row0.x, row0.y, row0.z), | ||
float3(row0.w, row1.x, row1.y), | ||
float3(row1.z, row1.w, row2.x), | ||
float3(row2.y, row2.z, row2.w) | ||
); | ||
} | ||
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vertex VertexOut VSInstance( | ||
VertexIn inp [[stage_in]], | ||
uint instID [[instance_id]], | ||
constant Scene& scene [[buffer(1)]], | ||
device const Instance* instances [[buffer(2)]], | ||
constant Globals& globals [[buffer(5)]]) | ||
{ | ||
VertexOut outp; | ||
Instance inst = instances[instID + globals.firstInstance]; | ||
float4x3 wMatrix = UnpackRowMajor3x4Matrix(inst.wMatrixRow0, inst.wMatrixRow1, inst.wMatrixRow2); | ||
float4 modelPos = float4(MeshAnimation(inp.position, scene.bendDir, globals.bendIntensity), 1); | ||
outp.worldPos = WarpPosition(scene, wMatrix * modelPos + globals.worldOffset); | ||
outp.position = scene.vpMatrix * float4(outp.worldPos, 1); | ||
outp.normal = wMatrix * float4(inp.normal, 0); | ||
outp.texCoord = inp.texCoord; | ||
outp.color = inst.color; | ||
return outp; | ||
} | ||
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// PIXEL SHADER INSTANCE | ||
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float SampleShadowMapOffset( | ||
depth2d<float> shadowMap, | ||
sampler shadowMapSampler, | ||
constant Scene& scene, | ||
float3 worldPos, | ||
float2 offset) | ||
{ | ||
// Project world position into shadow-map space | ||
float4 shadowPos = scene.vpShadowMatrix * float4(worldPos, 1); | ||
shadowPos /= shadowPos.w; | ||
shadowPos.xy = shadowPos.xy * float2(0.5, -0.5) + 0.5; | ||
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// Sample shadow map | ||
return shadowMap.sample_compare(shadowMapSampler, shadowPos.xy + offset * scene.shadowSizeInv, shadowPos.z); | ||
} | ||
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float SampleShadowMapPCF( | ||
depth2d<float> shadowMap, | ||
sampler shadowMapSampler, | ||
constant Scene& scene, | ||
float2 screenPos, | ||
float3 worldPos) | ||
{ | ||
// Perform percentage closer filtering (PCF) as described here: | ||
// https://developer.nvidia.com/gpugems/gpugems/part-ii-lighting-and-shadows/chapter-11-shadow-map-antialiasing | ||
float2 offset = (float2)(fract(screenPos * 0.5) > 0.25); | ||
if (offset.y > 1.1) | ||
offset.y = 0.0; | ||
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float shadowSamples = | ||
( | ||
SampleShadowMapOffset(shadowMap, shadowMapSampler, scene, worldPos, offset + float2(-1.5, +0.5)) + | ||
SampleShadowMapOffset(shadowMap, shadowMapSampler, scene, worldPos, offset + float2(+0.5, +0.5)) + | ||
SampleShadowMapOffset(shadowMap, shadowMapSampler, scene, worldPos, offset + float2(-1.5, -1.5)) + | ||
SampleShadowMapOffset(shadowMap, shadowMapSampler, scene, worldPos, offset + float2(+0.5, -1.5)) | ||
); | ||
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return shadowSamples * 0.25; | ||
} | ||
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fragment float4 PSInstance( | ||
VertexOut inp [[stage_in]], | ||
constant Scene& scene [[buffer(1)]], | ||
constant Globals& globals [[buffer(5)]], | ||
depth2d<float> shadowMap [[texture(3)]], | ||
sampler shadowMapSampler [[sampler(3)]]) | ||
{ | ||
// Get input color | ||
float4 albedo = inp.color; | ||
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// Diffuse lighting | ||
float3 lightVec = -scene.lightDir.xyz; | ||
float3 normal = normalize(inp.normal); | ||
float NdotL = mix(0.2, 1.0, max(0.0, dot(normal, lightVec))); | ||
float3 diffuse = albedo.rgb * NdotL; | ||
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// Specular lighting | ||
float3 viewDir = normalize(scene.viewPos - inp.worldPos); | ||
float3 halfVec = normalize(viewDir + lightVec); | ||
float NdotH = dot(normal, halfVec); | ||
float3 specular = (float3)pow(max(0.0, NdotH), scene.shininess); | ||
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// Apply shadow mapping | ||
float shadow = mix(scene.ambientItensity, 1.0, SampleShadowMapPCF(shadowMap, shadowMapSampler, scene, inp.position.xy, inp.worldPos)); | ||
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// Set final output color | ||
float3 light = scene.lightColor * (diffuse + specular) * shadow; | ||
return float4(light, albedo.a); | ||
} | ||
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// VERTEX SHADER GROUND | ||
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struct GroundVertexOut | ||
{ | ||
float4 position [[position]]; | ||
float2 texCoord; | ||
float3 worldPos; | ||
}; | ||
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vertex GroundVertexOut VSGround( | ||
VertexIn inp [[stage_in]], | ||
constant Scene& scene [[buffer(1)]]) | ||
{ | ||
GroundVertexOut outp; | ||
outp.position = scene.vpMatrix * float4(inp.position, 1); | ||
outp.texCoord = inp.texCoord; | ||
outp.worldPos = inp.position; | ||
return outp; | ||
} | ||
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// PIXEL SHADER GROUND | ||
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fragment float4 PSGround( | ||
GroundVertexOut inp [[stage_in]], | ||
constant Scene& scene [[buffer(1)]], | ||
texture2d<float> colorMap [[texture(2)]], | ||
sampler colorMapSampler [[sampler(2)]], | ||
depth2d<float> shadowMap [[texture(4)]], | ||
sampler shadowMapSampler [[sampler(4)]]) | ||
{ | ||
// Sample color map | ||
float4 albedo = colorMap.sample(colorMapSampler, inp.texCoord * scene.groundScale) * float4(scene.groundTint, 1); | ||
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// Apply shadow mapping | ||
float shadow = mix(scene.ambientItensity, 1.0, SampleShadowMapPCF(shadowMap, shadowMapSampler, scene, inp.position.xy, inp.worldPos)); | ||
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// Set final output color | ||
return float4(albedo.rgb * scene.lightColor * shadow, albedo.a); | ||
} | ||
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