31d3a4678f
Replace guessed sun direction (0.5, 0.4, 0.6) with ACME's verified value (0.5, 0.3, -0.3) from GameScene.cs:238. Replace hardcoded ambient/diffuse (0.25/0.75) with ACME's ambient intensity 0.45 from LandscapeEditorSettings.cs:108. Terrain shaders now match ACME Landscape.vert/frag pattern: - Vertex shader computes Lambert term with xLightDirection uniform - Fragment shader applies: color * (clamp(lambert, 0, 1) + xAmbient) Static object shader matches ACME StaticObject.vert: - LightingFactor = max(dot(N, -L), 0) + ambient - Removed separate uDiffuseIntensity (ACME doesn't have one) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
40 lines
1.5 KiB
GLSL
40 lines
1.5 KiB
GLSL
#version 430 core
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// Per-vertex attributes
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layout(location = 0) in vec3 aPosition;
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layout(location = 1) in vec3 aNormal;
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layout(location = 2) in vec2 aTexCoord;
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// Per-instance model matrix, split across four vec4 attribute slots.
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// A mat4 consumes 4 consecutive attribute locations, so locations 3-6 are
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// all occupied by this single logical matrix. The C# side must call
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// VertexAttribPointer four times (one per row) and VertexAttribDivisor(loc, 1)
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// on each of the four slots.
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layout(location = 3) in vec4 aInstanceRow0;
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layout(location = 4) in vec4 aInstanceRow1;
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layout(location = 5) in vec4 aInstanceRow2;
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layout(location = 6) in vec4 aInstanceRow3;
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uniform mat4 uViewProjection;
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uniform vec3 uLightDirection; // world-space light direction (points FROM sun, matching ACME)
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uniform float uAmbientIntensity;
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out vec2 vTex;
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out vec3 vWorldNormal;
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out float vLightingFactor;
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void main() {
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// Reconstruct the per-instance model matrix from its four row vectors.
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mat4 model = mat4(aInstanceRow0, aInstanceRow1, aInstanceRow2, aInstanceRow3);
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vec4 worldPos = model * vec4(aPosition, 1.0);
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gl_Position = uViewProjection * worldPos;
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// Transform normal into world space.
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vWorldNormal = normalize(mat3(model) * aNormal);
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vTex = aTexCoord;
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// Lambert + ambient matching ACME StaticObject.vert:
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// LightingFactor = max(dot(Normal, -uLightDirection), 0.0) + uAmbientIntensity;
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vLightingFactor = max(dot(vWorldNormal, -uLightDirection), 0.0) + uAmbientIntensity;
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}
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