32 lines
871 B
GLSL
32 lines
871 B
GLSL
#version 330
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//constant projection matrix
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uniform mat4 fg_ProjectionMatrix;
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uniform mat4 fg_ViewMatrix;
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uniform mat3 fg_NormalMatrix;
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//vertex-data
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in vec4 fg_Color;
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in vec3 fg_VertexIn;
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in vec3 fg_NormalIn;
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//output-data for later stages
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smooth out vec4 fg_SmoothColor;
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void main()
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{
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vec3 fg_Normal = fg_NormalMatrix * fg_NormalIn; //vec3(0,1,0);
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//transform vec3 into vec4, setting w to 1
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vec4 fg_Vertex = vec4(fg_VertexIn, 1.0);
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vec4 light = vec4(1.0,1.0,1.0,1.0);
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vec4 dark = vec4(0.0,0.0,0.0,1.0);
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//direction to sun from origin
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vec3 lightDir = normalize(fg_ViewMatrix * vec4(5.0,5.0,1.0,0.0)).xyz;
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float costheta = dot(normalize(fg_Normal), lightDir);
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float a = costheta * 0.5 + 0.5;
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fg_SmoothColor = fg_Color * mix(dark, light, a);// + 0.001* fg_Normal.xyzx;
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gl_Position = fg_ProjectionMatrix * fg_ViewMatrix * fg_Vertex;
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} |