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Work on character rendering and frustrum culling etc

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Kelsi 2026-02-22 05:58:45 -08:00
parent fc5294eb0f
commit 7dd1dada5f
16 changed files with 559 additions and 138 deletions
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53
src/rendering/frustum.cpp
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@ -5,45 +5,56 @@ namespace wowee {
namespace rendering {
void Frustum::extractFromMatrix(const glm::mat4& vp) {
// Extract planes from view-projection matrix
// Based on Gribb & Hartmann method (Fast Extraction of Viewing Frustum Planes)
// Extract frustum planes from view-projection matrix.
// Vulkan clip-space conventions (GLM_FORCE_DEPTH_ZERO_TO_ONE + Y-flip):
// x_clip ∈ [-w, w], y_clip ∈ [-w, w] (Y flipped in proj), z_clip ∈ [0, w]
//
// Gribb & Hartmann method adapted for Vulkan depth [0,1].
// Left/Right/Top/Bottom use the standard row4 ± row1/row2 formulas
// (the Y-flip swaps the TOP/BOTTOM row2 sign, but the extracted half-spaces
// are still correct — they just get each other's label. We swap the
// assignments so the enum names match the geometric meaning.)
// Left plane: row4 + row1
// Left plane: row4 + row1 (x_clip >= -w_clip)
planes[LEFT].normal.x = vp[0][3] + vp[0][0];
planes[LEFT].normal.y = vp[1][3] + vp[1][0];
planes[LEFT].normal.z = vp[2][3] + vp[2][0];
planes[LEFT].distance = vp[3][3] + vp[3][0];
normalizePlane(planes[LEFT]);
// Right plane: row4 - row1
// Right plane: row4 - row1 (x_clip <= w_clip)
planes[RIGHT].normal.x = vp[0][3] - vp[0][0];
planes[RIGHT].normal.y = vp[1][3] - vp[1][0];
planes[RIGHT].normal.z = vp[2][3] - vp[2][0];
planes[RIGHT].distance = vp[3][3] - vp[3][0];
normalizePlane(planes[RIGHT]);
// Bottom plane: row4 + row2
planes[BOTTOM].normal.x = vp[0][3] + vp[0][1];
planes[BOTTOM].normal.y = vp[1][3] + vp[1][1];
planes[BOTTOM].normal.z = vp[2][3] + vp[2][1];
planes[BOTTOM].distance = vp[3][3] + vp[3][1];
normalizePlane(planes[BOTTOM]);
// With the Vulkan Y-flip (proj[1][1] negated), row4+row2 extracts
// what is geometrically the TOP plane and row4-row2 extracts BOTTOM.
// Swap the assignments so enum labels match geometry.
// Top plane: row4 - row2
planes[TOP].normal.x = vp[0][3] - vp[0][1];
planes[TOP].normal.y = vp[1][3] - vp[1][1];
planes[TOP].normal.z = vp[2][3] - vp[2][1];
planes[TOP].distance = vp[3][3] - vp[3][1];
// Top plane (geometric): row4 - row2 after Y-flip
planes[TOP].normal.x = vp[0][3] + vp[0][1];
planes[TOP].normal.y = vp[1][3] + vp[1][1];
planes[TOP].normal.z = vp[2][3] + vp[2][1];
planes[TOP].distance = vp[3][3] + vp[3][1];
normalizePlane(planes[TOP]);
// Near plane: row4 + row3
planes[NEAR].normal.x = vp[0][3] + vp[0][2];
planes[NEAR].normal.y = vp[1][3] + vp[1][2];
planes[NEAR].normal.z = vp[2][3] + vp[2][2];
planes[NEAR].distance = vp[3][3] + vp[3][2];
// Bottom plane (geometric): row4 + row2 after Y-flip
planes[BOTTOM].normal.x = vp[0][3] - vp[0][1];
planes[BOTTOM].normal.y = vp[1][3] - vp[1][1];
planes[BOTTOM].normal.z = vp[2][3] - vp[2][1];
planes[BOTTOM].distance = vp[3][3] - vp[3][1];
normalizePlane(planes[BOTTOM]);
// Near plane: row3 (z_clip >= 0 in Vulkan depth [0,1])
planes[NEAR].normal.x = vp[0][2];
planes[NEAR].normal.y = vp[1][2];
planes[NEAR].normal.z = vp[2][2];
planes[NEAR].distance = vp[3][2];
normalizePlane(planes[NEAR]);
// Far plane: row4 - row3
// Far plane: row4 - row3 (z_clip <= w_clip)
planes[FAR].normal.x = vp[0][3] - vp[0][2];
planes[FAR].normal.y = vp[1][3] - vp[1][2];
planes[FAR].normal.z = vp[2][3] - vp[2][2];