86 lines
2.5 KiB
Forth
86 lines
2.5 KiB
Forth
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#version 330
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// Input from vertex shader
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in vec3 fragPosition;
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in vec3 fragNormal;
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in vec2 fragTexCoord;
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// Uniforms
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uniform sampler2D texture0;
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uniform vec3 viewPos;
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uniform vec3 lightDir;
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uniform vec3 lightColor;
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uniform float lightIntensity;
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uniform float ambientIntensity;
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uniform vec3 terrainColor;
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// Output
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out vec4 finalColor;
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// Simplex noise for AO calculation
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float hash(float n) {
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return fract(sin(n) * 43758.5453123);
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}
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float noise(vec3 p) {
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vec3 i = floor(p);
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vec3 f = fract(p);
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f = f * f * (3.0 - 2.0 * f);
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float n = i.x + i.y * 157.0 + i.z * 113.0;
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return mix(
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mix(mix(hash(n), hash(n + 1.0), f.x),
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mix(hash(n + 157.0), hash(n + 158.0), f.x), f.y),
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mix(mix(hash(n + 113.0), hash(n + 114.0), f.x),
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mix(hash(n + 270.0), hash(n + 271.0), f.x), f.y),
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f.z
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);
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}
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// Calculate ambient occlusion with more contrast
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float calculateAO(vec3 position, vec3 normal) {
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// Sample 8 directions around the surface
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float ao = 0.0;
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float radius = 2.5;
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int samples = 8;
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for (int i = 0; i < samples; i++) {
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float angle = 6.28318530718 * float(i) / float(samples);
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vec3 offset = vec3(cos(angle) * radius, noise(position * 0.5 + float(i)), sin(angle) * radius);
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// Sample height variation (approximated via noise)
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float heightVariation = noise((position + offset) * 0.3);
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// Calculate occlusion based on height and normal
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float dotProduct = max(0.0, dot(normal, normalize(offset)));
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ao += mix(0.0, dotProduct * heightVariation, 0.7);
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}
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// Increased contrast: 0.8 multiplier instead of 0.6
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ao = 1.0 - (ao / float(samples)) * 0.8;
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// Min 0.1 (darker shadows) instead of 0.2
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return max(0.1, ao);
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}
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void main()
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{
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// Normalize interpolated normal
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vec3 norm = normalize(fragNormal);
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// Use normal Y component to create geometry-revealing green shading
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// Higher Y normal (upward-facing) = brighter green (peaks/flat areas)
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// Lower Y normal (sloped) = darker green (slopes/valleys)
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float brightness = (norm.y + 1.0) * 0.5; // Map -1..1 to 0..1
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// Increase contrast: darker minimum, brighter maximum
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// Old range: 0.4 to 1.0 (0.6 total range)
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// New range: 0.2 to 1.2 (1.0 total range) - much more contrast
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float contrastMultiplier = 0.2 + brightness * 1.0;
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// Create base terrain color modulated by geometry
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vec3 baseColor = terrainColor;
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vec3 finalColorRGB = baseColor * contrastMultiplier;
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finalColor = vec4(finalColorRGB, 1.0);
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}
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