43 lines
1.3 KiB
GLSL
43 lines
1.3 KiB
GLSL
out vec3 oldPos;
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out vec3 newPos;
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out vec3 ray;
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in vec3 position;
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#include <utils>
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#include <cylinder_utils>
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vec3 project(vec3 origin, vec3 ray, vec3 refractedLight) {
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vec2 tcyl = intersectCylinder(origin, ray, poolRadius, -poolHeight, poolHeight * 2.0);
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origin += ray * tcyl.y;
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float tplane = (-origin.y - poolHeight) / refractedLight.y;
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return origin + refractedLight * tplane;
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}
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void main() {
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// Collapse vertices outside the unit circle to avoid degenerate caustic triangles
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if (position.x * position.x + position.y * position.y > 1.0) {
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oldPos = vec3(0.0);
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newPos = vec3(0.0);
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ray = vec3(0.0);
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gl_Position = vec4(0.0);
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return;
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}
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vec4 info = texture(water, position.xy * 0.5 + 0.5);
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info.ba *= 0.5;
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vec3 normal = vec3(info.b, sqrt(1.0 - dot(info.ba, info.ba)), info.a);
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vec3 refractedLight = refract(-light, vec3(0.0, 1.0, 0.0), IOR_AIR / IOR_WATER);
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vec3 basePos = vec3(position.x * poolRadius, 0.0, position.y * poolRadius);
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ray = refract(-light, normal, IOR_AIR / IOR_WATER);
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oldPos = project(basePos, refractedLight, refractedLight);
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newPos = project(basePos + vec3(0.0, info.r, 0.0), ray, refractedLight);
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vec2 normalizedPos = newPos.xz / poolRadius;
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vec2 refractedOffset = (refractedLight.xz / poolRadius) / refractedLight.y;
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gl_Position = vec4(0.75 * (normalizedPos + refractedOffset), 0.0, 1.0);
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}
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