first commit

assets/shaders/mesh.frag

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+#version 450 core
+layout(location = 0) out vec4 oColor;
+
+layout(std140, binding = 0) uniform PerFrame {
+  mat4 uView;
+  mat4 uProj;
+  vec4 uLightDir;
+};
+layout(std140, binding = 2) uniform Material {
+  vec4 uAlbedo; // rgb used, a padding
+};
+
+in VS_OUT {
+  vec3 wPos;
+  vec3 wNrm;
+  vec2 uv;
+  flat int hasNrm;
+  flat int hasUV;
+} v;
+
+vec3 fallbackNormal(vec3 wPos) {
+  vec3 dx = dFdx(wPos), dy = dFdy(wPos);
+  vec3 c = cross(dx, dy);
+  float l2 = dot(c, c);
+  return (l2 < 1e-12) ? vec3(0, 0, 1) : normalize(c);
+}
+
+void main() {
+  vec3 N = (v.hasNrm != 0) ? normalize(v.wNrm) : fallbackNormal(v.wPos);
+  vec3 L = normalize(-uLightDir.xyz);
+  float ndl = max(dot(N, L), 0.0);
+  vec3 ambient = vec3(0.08);
+  vec3 colorLinear = ambient + uAlbedo.rgb * ndl;
+  oColor = vec4(pow(colorLinear, vec3(1.0/2.2)), 1.0);
+}