first commit

assets/shaders/mesh.vert

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+#version 450 core
+out gl_PerVertex {
+  vec4 gl_Position;
+};
+
+layout(std140, binding = 0) uniform PerFrame {
+  mat4 uView;
+  mat4 uProj;
+  vec4 uLightDir; // xyz used, w padding
+};
+layout(std140, binding = 1) uniform PerObject {
+  mat4 uModel;
+};
+
+layout(location = 0) in vec3 aPos;
+layout(location = 1) in vec3 aNormal;
+layout(location = 2) in vec2 aUV;
+
+out VS_OUT {
+  vec3 wPos;
+  vec3 wNrm;
+  vec2 uv;
+  flat int hasNrm;
+  flat int hasUV;
+} v;
+
+void main() {
+  vec4 wpos4 = uModel * vec4(aPos, 1.0);
+  v.wPos = wpos4.xyz;
+
+  float nLen2 = dot(aNormal, aNormal);
+  if(nLen2 > 1e-10) {
+    mat3 nrmMat = mat3(transpose(inverse(uModel)));
+    v.wNrm = normalize(nrmMat * aNormal);
+    v.hasNrm = 1;
+  } else {
+    v.wNrm = vec3(0.0);
+    v.hasNrm = 0;
+  }
+
+  v.uv = aUV;
+  v.hasUV = (abs(aUV.x) + abs(aUV.y)) > 1e-10 ? 1 : 0;
+
+  gl_Position = uProj * uView * wpos4;
+}