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avoid unnecessary conversion of colours between half4 to float4 and back again

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a dinosaur
2024-08-25 15:14:00 +10:00
parent 428b142bf2
commit 8de398ce13
3 changed files with 22 additions and 9 deletions
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6
Sources/Voxelotl/shader.metal
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@ -45,18 +45,18 @@ fragment half4 fragmentMain(
// Compute diffuse component
float lambert = metal::dot(normal, lightVec);
float diffuseAmount = metal::max(0.0, lambert);
half4 diffuse = half4(u.diffuseColor) * diffuseAmount;
half4 diffuse = u.diffuseColor * diffuseAmount;
// Compute specular component (blinn-phong)
float specularAngle = metal::max(0.0, metal::dot(halfDir, normal));
float specularTerm = metal::pow(specularAngle, u.specularIntensity);
// smoothstep hack to ensure highlight tapers gracefully at grazing angles
float specularAmount = specularTerm * metal::smoothstep(0, 2, lambert * u.specularIntensity);
half4 specular = half4(u.specularColor) * specularAmount;
half4 specular = u.specularColor * specularAmount;
// Sample texture & vertex color to get albedo
half4 albedo = texture.sample(sampler, in.texCoord);
albedo *= in.color;
return albedo * (half4(u.ambientColor) + diffuse) + specular;
return albedo * (u.ambientColor + diffuse) + specular;
}