1 files changed, 29 insertions, 0 deletions
diff --git a/source/shaders/instanced_model.vs.glsl b/source/shaders/instanced_model.vs.glsl
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+++ b/source/shaders/instanced_model.vs.glsl
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+#version 330 core
+layout(location=0) in vec3 aPos;
+layout(location=1) in vec3 aNormal;
+layout(location=2) in vec2 aTex;
+layout(location=3) in mat4 aTransform;
+
+// uniform mat4 Model;
+layout (std140) uniform Matrices {
+  mat4 View;        // start:  0      // end: 16 *  4 =  64
+  mat4 Projection;  // start: 64      // end: 64 + 64 = 128
+};
+
+uniform mat4 Model;
+
+out vec2 TexCoords;
+out vec3 VertexWorldPos;
+out vec3 FragNormal;
+
+// @note: I still do not fully understand how the FragNormal calculation works. Need to make sure I intuitively 
+// get that
+
+void main() {
+  gl_Position = Projection*View*aTransform*vec4(aPos, 1.0);
+
+  VertexWorldPos = vec3(aTransform * vec4(aPos, 1.0));
+  FragNormal = mat3(transpose(inverse(aTransform))) * aNormal;
+  FragNormal = normalize(FragNormal);
+  TexCoords = aTex;
+};