39 lines
1.1 KiB
GLSL
39 lines
1.1 KiB
GLSL
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#version 330
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layout(location = 0) in vec3 aPosition;
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layout(location = 1) in vec3 aNormal;
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out vec3 vPosition;
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out vec3 vNormal;
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// Model View Projection matrix found by P * V * M
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struct MVP {
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mat4 model;
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mat4 view;
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mat4 projection;
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// Additional uniform to allow CPU to provide mat3(transpose(inverse(uModel)))
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// + Makes a big difference in quality of diffuse shading
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// + QMatrix4x4.normalMatrix() returns a mat3 that can be used as a uniform
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mat3 normalMatrix;
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};
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uniform MVP uMVP;
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vec4 VertexPosition(in MVP mvp, in vec3 position)
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{
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return mvp.projection * mvp.view * mvp.model * vec4(position, 1.0f);
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}
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void main()
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{
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// Find normals, pass to fragment shader
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vNormal = uMVP.normalMatrix * aNormal;
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// vNormal = aNormal; // This is possible without the additional uniform
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// Or you could find this on the GPU using the uModel matrix
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// vNormal = mat3(transpose(inverse(uModel))) * aNormal;
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// Set the vertex position to pass to fragment shader using only model matrix
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vPosition = vec3(uMVP.model * vec4(aPosition, 1.0f));
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// Set vertex gl_Position using MVP matrix
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gl_Position = VertexPosition(uMVP, aPosition);
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}
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