43 lines
1.3 KiB
GLSL
43 lines
1.3 KiB
GLSL
#version 330 core
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// Input
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layout(location = 0) in vec3 RawPosition;
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layout(location = 1) in vec3 RawNormal;
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// Output
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out vec4 LightColor;
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// Uniforms
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layout(std140) uniform MVPBlock
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{
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mat4 ModelMtx;
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mat4 ViewMtx;
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mat4 ProjMtx;
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};
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uniform bool IsFloor;
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uniform bool IsUnstandable;
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// Main
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void main()
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{
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const vec3 kLightDir = normalize( vec3(0.3, 0, -1) ); // Sets the direction of the light
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const float kLightColorMin = 0.5; // Sets the minimum light color (color of a vertex facing away from the light)
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const float kLightColorMax = 0.9; // Sets the maximum light color (color of a vertex facing towards the light)
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// Calculate vertex position
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mat4 MVP = ModelMtx * ViewMtx * ProjMtx;
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gl_Position = vec4(RawPosition, 1) * MVP;
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// Apply some simple lighting
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float LightDot = dot(RawNormal, kLightDir);
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float Alpha = (-LightDot + 1.0) / 2;
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float LightAlpha = mix(kLightColorMin, kLightColorMax, Alpha);
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LightColor = vec4(LightAlpha, LightAlpha, LightAlpha, 1.0);
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// If this is not a floor, make the surface significantly darker
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// The surface is considered a floor if IsFloor is true OR if the floor normal Z is greater than 0.85
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float FloorMul = (!IsUnstandable && (IsFloor || RawNormal.z > 0.85)) ? 1.0 : 0.5;
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LightColor *= FloorMul;
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}
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