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phase(N.5b) Task 4: terrain_modern.vert

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Vertex shader for the modern terrain dispatcher. Bit-identical math
to today's terrain.vert (Phase 3c per-cell mesh + Phase G AdjustPlanes
lighting). The only structural change is the version + bindless
extension preamble — sampler access stays a regular sampler2DArray
uniform; bindless-ness is invisible at the GLSL level.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-09 08:45:22 +02:00
parent ba852993e9
commit 3c108a0d68
1 changed files with 115 additions and 0 deletions
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115
src/AcDream.App/Rendering/Shaders/terrain_modern.vert Normal file
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#version 460 core
#extension GL_ARB_bindless_texture : require
// Phase N.5b: terrain shader on the modern bindless dispatcher.
// Math identical to terrain.vert (Phase 3c per-cell mesh + Phase G AdjustPlanes
// lighting). The only structural change is the version + bindless extension
// — sampler access in the fragment stage is unchanged at the GLSL level.
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aNormal;
layout(location = 2) in uvec4 aPacked0;
layout(location = 3) in uvec4 aPacked1;
layout(location = 4) in uvec4 aPacked2;
layout(location = 5) in uvec4 aPacked3;
uniform mat4 uView;
uniform mat4 uProjection;
struct Light {
vec4 posAndKind;
vec4 dirAndRange;
vec4 colorAndIntensity;
vec4 coneAngleEtc;
};
layout(std140, binding = 1) uniform SceneLighting {
Light uLights[8];
vec4 uCellAmbient;
vec4 uFogParams;
vec4 uFogColor;
vec4 uCameraAndTime;
};
out vec2 vBaseUV;
out vec3 vWorldNormal;
out vec3 vWorldPos;
out vec3 vLightingRGB;
out vec4 vOverlay0;
out vec4 vOverlay1;
out vec4 vOverlay2;
out vec4 vRoad0;
out vec4 vRoad1;
flat out float vBaseTexIdx;
const float MIN_FACTOR = 0.0;
vec4 unpackOverlayLayer(uint texIdxU, uint alphaIdxU, uint rotIdx, vec2 baseUV) {
float texIdx = float(texIdxU);
float alphaIdx = float(alphaIdxU);
if (texIdx >= 254.0) texIdx = -1.0;
if (alphaIdx >= 254.0) alphaIdx = -1.0;
vec2 rotatedUV = baseUV;
if (rotIdx == 1u) rotatedUV = vec2(1.0 - baseUV.y, baseUV.x);
else if (rotIdx == 2u) rotatedUV = vec2(1.0 - baseUV.x, 1.0 - baseUV.y);
else if (rotIdx == 3u) rotatedUV = vec2( baseUV.y, 1.0 - baseUV.x);
return vec4(rotatedUV.x, rotatedUV.y, texIdx, alphaIdx);
}
void main() {
uint rotOvl0 = (aPacked3.x >> 2u) & 3u;
uint rotOvl1 = (aPacked3.x >> 4u) & 3u;
uint rotOvl2 = (aPacked3.x >> 6u) & 3u;
uint rotRd0 = aPacked3.y & 3u;
uint rotRd1 = (aPacked3.y >> 2u) & 3u;
uint splitDir= (aPacked3.y >> 4u) & 1u;
int vIdx = gl_VertexID % 6;
int corner = 0;
if (splitDir == 0u) {
// SWtoNE order: BL, BR, TR, BL, TR, TL → corners 0, 1, 2, 0, 2, 3
if (vIdx == 0) corner = 0;
else if (vIdx == 1) corner = 1;
else if (vIdx == 2) corner = 2;
else if (vIdx == 3) corner = 0;
else if (vIdx == 4) corner = 2;
else corner = 3;
} else {
// SEtoNW order: BL, BR, TL, BR, TR, TL → corners 0, 1, 3, 1, 2, 3
if (vIdx == 0) corner = 0;
else if (vIdx == 1) corner = 1;
else if (vIdx == 2) corner = 3;
else if (vIdx == 3) corner = 1;
else if (vIdx == 4) corner = 2;
else corner = 3;
}
vec2 baseUV;
if (corner == 0) baseUV = vec2(0.0, 1.0);
else if (corner == 1) baseUV = vec2(1.0, 1.0);
else if (corner == 2) baseUV = vec2(1.0, 0.0);
else baseUV = vec2(0.0, 0.0);
vBaseUV = baseUV;
vWorldPos = aPos;
vWorldNormal = normalize(aNormal);
// Retail AdjustPlanes bake (terrain.vert:124-134 — identical math).
vec3 sunDir = uLights[0].dirAndRange.xyz;
vec3 sunCol = uLights[0].colorAndIntensity.xyz * uLights[0].colorAndIntensity.w;
float L = max(dot(vWorldNormal, -sunDir), MIN_FACTOR);
vLightingRGB = sunCol * L + uCellAmbient.xyz;
float baseTex = float(aPacked0.x);
if (baseTex >= 254.0) baseTex = -1.0;
vBaseTexIdx = baseTex;
vOverlay0 = unpackOverlayLayer(aPacked0.z, aPacked0.w, rotOvl0, baseUV);
vOverlay1 = unpackOverlayLayer(aPacked1.x, aPacked1.y, rotOvl1, baseUV);
vOverlay2 = unpackOverlayLayer(aPacked1.z, aPacked1.w, rotOvl2, baseUV);
vRoad0 = unpackOverlayLayer(aPacked2.x, aPacked2.y, rotRd0, baseUV);
vRoad1 = unpackOverlayLayer(aPacked2.z, aPacked2.w, rotRd1, baseUV);
gl_Position = uProjection * uView * vec4(aPos, 1.0);
}