61 lines
1.6 KiB
GLSL
61 lines
1.6 KiB
GLSL
#version 450
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layout (set = 0, binding = 1) uniform sampler2D samplerHeight;
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layout (set = 0, binding = 2) uniform sampler2DArray samplerLayers;
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layout (location = 0) in vec3 inNormal;
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layout (location = 1) in vec2 inUV;
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layout (location = 2) in vec3 inViewVec;
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layout (location = 3) in vec3 inLightVec;
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layout (location = 4) in vec3 inEyePos;
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layout (location = 5) in vec3 inWorldPos;
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layout (location = 0) out vec4 outFragColor;
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vec3 sampleTerrainLayer()
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{
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// Define some layer ranges for sampling depending on terrain height
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vec2 layers[6];
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layers[0] = vec2(-10.0, 10.0);
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layers[1] = vec2(5.0, 45.0);
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layers[2] = vec2(45.0, 80.0);
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layers[3] = vec2(75.0, 100.0);
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layers[4] = vec2(95.0, 140.0);
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layers[5] = vec2(140.0, 190.0);
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vec3 color = vec3(0.0);
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// Get height from displacement map
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float height = textureLod(samplerHeight, inUV, 0.0).r * 255.0;
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for (int i = 0; i < 6; i++)
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{
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float range = layers[i].y - layers[i].x;
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float weight = (range - abs(height - layers[i].y)) / range;
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weight = max(0.0, weight);
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color += weight * texture(samplerLayers, vec3(inUV * 16.0, i)).rgb;
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}
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return color;
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}
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float fog(float density)
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{
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const float LOG2 = -1.442695;
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float dist = gl_FragCoord.z / gl_FragCoord.w * 0.1;
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float d = density * dist;
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return 1.0 - clamp(exp2(d * d * LOG2), 0.0, 1.0);
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}
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void main()
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{
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vec3 N = normalize(inNormal);
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vec3 L = normalize(inLightVec);
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vec3 ambient = vec3(0.5);
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vec3 diffuse = max(dot(N, L), 0.0) * vec3(1.0);
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vec4 color = vec4((ambient + diffuse) * sampleTerrainLayer(), 1.0);
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const vec4 fogColor = vec4(0.47, 0.5, 0.67, 0.0);
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outFragColor = mix(color, fogColor, fog(0.25));
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}
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