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specular highlights (blinn-phong)

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a dinosaur
2024-08-19 00:05:53 +10:00
parent 94ed59055a
commit 5a7b53833d
4 changed files with 23 additions and 8 deletions
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16
Sources/Voxelotl/shader.metal
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@ -4,6 +4,7 @@
struct FragmentInput {
float4 position [[position]];
float3 world;
float3 normal;
float2 texCoord;
half4 color;
@ -18,10 +19,10 @@ vertex FragmentInput vertexMain(
) {
auto position = vtx[vertexID].position;
auto world = i[instanceID].model * position;
auto ndc = u.projView * world;
FragmentInput out;
out.position = ndc;
out.position = u.projView * world;
out.world = world.xyz;
out.color = half4(i[instanceID].color) / 255.0;
out.normal = (i[instanceID].normalModel * vtx[vertexID].normal).xyz;
out.texCoord = vtx[vertexID].texCoord;
@ -36,11 +37,18 @@ fragment half4 fragmentMain(
constexpr metal::sampler sampler(metal::address::repeat, metal::filter::nearest);
auto normal = metal::normalize(in.normal);
float lambert = metal::dot(normal, -u.directionalLight);
auto lightVec = -u.directionalLight;
float lambert = metal::dot(normal, lightVec);
float diffuse = metal::max(0.0, lambert);
auto eyeVector = metal::normalize(u.cameraPosition - in.world);
auto halfDir = metal::normalize(lightVec + eyeVector);
float specularAngle = metal::max(0.0, metal::dot(halfDir, normal));
float specularTerm = metal::pow(specularAngle, u.specularIntensity);
half4 specularAmount = specularTerm * metal::smoothstep(0, 2, lambert * u.specularIntensity);
half4 albedo = texture.sample(sampler, in.texCoord);
albedo *= in.color;
return albedo * diffuse;
return albedo * diffuse + half4(u.specularColor) * specularAmount;
}