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Update leenkx/Shaders/std/constants.glsl

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Onek8
2025-07-10 00:09:21 +00:00
parent 8077f00ada
commit 15ac833f2c
1 changed files with 32 additions and 25 deletions
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57
leenkx/Shaders/std/constants.glsl
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@ -24,37 +24,44 @@ const int DIFFUSE_CONE_COUNT = 16;
const float SHADOW_CONE_APERTURE = radians(15.0); const float SHADOW_CONE_APERTURE = radians(15.0);
const float DIFFUSE_CONE_APERTURE = radians(50.0); const float DIFFUSE_CONE_APERTURE = 0.872665; // 50 degrees in radians
const vec3 DIFFUSE_CONE_DIRECTIONS[DIFFUSE_CONE_COUNT] = vec3[]( mat3 makeTangentBasis(const vec3 normal) {
vec3(0.0, 0.0, 1.0), // center // Create a tangent basis from normal vector
vec3 tangent;
vec3 bitangent;
vec3(0.0, 0.5, 0.866), // Compute tangent (Frisvad's method)
vec3(0.5, 0.0, 0.866), if (abs(normal.z) < 0.999) {
vec3(0.0, -0.5, 0.866), tangent = normalize(cross(vec3(0, 1, 0), normal));
vec3(-0.5, 0.0, 0.866), } else {
tangent = normalize(cross(normal, vec3(1, 0, 0)));
}
bitangent = cross(normal, tangent);
vec3(0.353, 0.353, 0.866),
vec3(0.353, -0.353, 0.866),
vec3(-0.353, -0.353, 0.866),
vec3(-0.353, 0.353, 0.866),
vec3(0.707, 0.0, 0.707),
vec3(0.0, 0.707, 0.707),
vec3(-0.707, 0.0, 0.707),
vec3(0.0, -0.707, 0.707),
vec3(0.5, 0.5, 0.707),
vec3(-0.5, 0.5, 0.707),
vec3(-0.5, -0.5, 0.707)
);
mat3 makeTangentBasis(vec3 normal) {
vec3 tangent = normalize(abs(normal.y) < 0.999 ? cross(normal, vec3(0, 1, 0)) : cross(normal, vec3(1, 0, 0)));
vec3 bitangent = cross(normal, tangent);
return mat3(tangent, bitangent, normal); return mat3(tangent, bitangent, normal);
} }
// 16 optimized cone directions for hemisphere sampling (Z-up, normalized)
const vec3 DIFFUSE_CONE_DIRECTIONS[16] = vec3[](
vec3(0.707107, 0.000000, 0.707107), // Front
vec3(-0.707107, 0.000000, 0.707107), // Back
vec3(0.000000, 0.707107, 0.707107), // Right
vec3(0.000000, -0.707107, 0.707107), // Left
vec3(0.500000, 0.500000, 0.707107), // Front-right
vec3(-0.500000, 0.500000, 0.707107), // Back-right
vec3(0.500000, -0.500000, 0.707107), // Front-left
vec3(-0.500000, -0.500000, 0.707107),// Back-left
vec3(0.353553, 0.000000, 0.935414), // Narrow front
vec3(-0.353553, 0.000000, 0.935414), // Narrow back
vec3(0.000000, 0.353553, 0.935414), // Narrow right
vec3(0.000000, -0.353553, 0.935414), // Narrow left
vec3(0.270598, 0.270598, 0.923880), // Narrow front-right
vec3(-0.270598, 0.270598, 0.923880), // Narrow back-right
vec3(0.270598, -0.270598, 0.923880), // Narrow front-left
vec3(-0.270598, -0.270598, 0.923880) // Narrow back-left
);
// TO DO - Disabled momentarily instead of changing formulas // TO DO - Disabled momentarily instead of changing formulas
const float off_BayerMatrix8[8][8] = const float off_BayerMatrix8[8][8] =
{ {