core: Move to hyprutils for Math

Moves CRegion, CBox and Vector2D over to hyprutils.

Requires hyprutils>=0.1.4

1 files changed, 220 insertions, 0 deletions

diff --git a/src/helpers/math/Math.cpp b/src/helpers/math/Math.cpp
new file mode 100644
index 00000000..df4f1bb5
--- /dev/null
+++ b/src/helpers/math/Math.cpp
@@ -0,0 +1,220 @@
+#include "Math.hpp"
+#include <unordered_map>
+
+Hyprutils::Math::eTransform wlTransformToHyprutils(wl_output_transform t) {
+    switch (t) {
+        case WL_OUTPUT_TRANSFORM_NORMAL: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_NORMAL;
+        case WL_OUTPUT_TRANSFORM_180: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_180;
+        case WL_OUTPUT_TRANSFORM_90: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_90;
+        case WL_OUTPUT_TRANSFORM_270: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_270;
+        case WL_OUTPUT_TRANSFORM_FLIPPED: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_FLIPPED;
+        case WL_OUTPUT_TRANSFORM_FLIPPED_180: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_FLIPPED_180;
+        case WL_OUTPUT_TRANSFORM_FLIPPED_270: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_FLIPPED_270;
+        case WL_OUTPUT_TRANSFORM_FLIPPED_90: return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_FLIPPED_90;
+        default: break;
+    }
+    return Hyprutils::Math::eTransform::HYPRUTILS_TRANSFORM_NORMAL;
+}
+
+static void matrixIdentity(float mat[9]) {
+    static const float identity[9] = {
+        1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+    };
+    memcpy(mat, identity, sizeof(identity));
+}
+
+static void matrixMultiply(float mat[9], const float a[9], const float b[9]) {
+    float product[9];
+
+    product[0] = a[0] * b[0] + a[1] * b[3] + a[2] * b[6];
+    product[1] = a[0] * b[1] + a[1] * b[4] + a[2] * b[7];
+    product[2] = a[0] * b[2] + a[1] * b[5] + a[2] * b[8];
+
+    product[3] = a[3] * b[0] + a[4] * b[3] + a[5] * b[6];
+    product[4] = a[3] * b[1] + a[4] * b[4] + a[5] * b[7];
+    product[5] = a[3] * b[2] + a[4] * b[5] + a[5] * b[8];
+
+    product[6] = a[6] * b[0] + a[7] * b[3] + a[8] * b[6];
+    product[7] = a[6] * b[1] + a[7] * b[4] + a[8] * b[7];
+    product[8] = a[6] * b[2] + a[7] * b[5] + a[8] * b[8];
+
+    memcpy(mat, product, sizeof(product));
+}
+
+static void matrixTranspose(float mat[9], const float a[9]) {
+    float transposition[9] = {
+        a[0], a[3], a[6], a[1], a[4], a[7], a[2], a[5], a[8],
+    };
+    memcpy(mat, transposition, sizeof(transposition));
+}
+
+static void matrixTranslate(float mat[9], float x, float y) {
+    float translate[9] = {
+        1.0f, 0.0f, x, 0.0f, 1.0f, y, 0.0f, 0.0f, 1.0f,
+    };
+    wlr_matrix_multiply(mat, mat, translate);
+}
+
+static void matrixScale(float mat[9], float x, float y) {
+    float scale[9] = {
+        x, 0.0f, 0.0f, 0.0f, y, 0.0f, 0.0f, 0.0f, 1.0f,
+    };
+    wlr_matrix_multiply(mat, mat, scale);
+}
+
+static void matrixRotate(float mat[9], float rad) {
+    float rotate[9] = {
+        cos(rad), -sin(rad), 0.0f, sin(rad), cos(rad), 0.0f, 0.0f, 0.0f, 1.0f,
+    };
+    wlr_matrix_multiply(mat, mat, rotate);
+}
+
+static std::unordered_map<eTransform, std::array<float, 9>> transforms = {
+    {HYPRUTILS_TRANSFORM_NORMAL,
+     {
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_90,
+     {
+         0.0f,
+         1.0f,
+         0.0f,
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_180,
+     {
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_270,
+     {
+         0.0f,
+         -1.0f,
+         0.0f,
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_FLIPPED,
+     {
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_FLIPPED_90,
+     {
+         0.0f,
+         1.0f,
+         0.0f,
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_FLIPPED_180,
+     {
+         1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+    {HYPRUTILS_TRANSFORM_FLIPPED_270,
+     {
+         0.0f,
+         -1.0f,
+         0.0f,
+         -1.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         0.0f,
+         1.0f,
+     }},
+};
+
+static void matrixTransform(float mat[9], eTransform transform) {
+    matrixMultiply(mat, mat, transforms.at(transform).data());
+}
+
+static void matrixProjection(float mat[9], int width, int height, eTransform transform) {
+    memset(mat, 0, sizeof(*mat) * 9);
+
+    const float* t = transforms.at(transform).data();
+    float        x = 2.0f / width;
+    float        y = 2.0f / height;
+
+    // Rotation + reflection
+    mat[0] = x * t[0];
+    mat[1] = x * t[1];
+    mat[3] = y * -t[3];
+    mat[4] = y * -t[4];
+
+    // Translation
+    mat[2] = -copysign(1.0f, mat[0] + mat[1]);
+    mat[5] = -copysign(1.0f, mat[3] + mat[4]);
+
+    // Identity
+    mat[8] = 1.0f;
+}
+
+void projectBox(float mat[9], CBox& box, eTransform transform, float rotation, const float projection[9]) {
+    double x      = box.x;
+    double y      = box.y;
+    double width  = box.width;
+    double height = box.height;
+
+    matrixIdentity(mat);
+    matrixTranslate(mat, x, y);
+
+    if (rotation != 0) {
+        matrixTranslate(mat, width / 2, height / 2);
+        matrixRotate(mat, rotation);
+        matrixTranslate(mat, -width / 2, -height / 2);
+    }
+
+    wlr_matrix_scale(mat, width, height);
+
+    if (transform != HYPRUTILS_TRANSFORM_NORMAL) {
+        matrixTranslate(mat, 0.5, 0.5);
+        matrixTransform(mat, transform);
+        matrixTranslate(mat, -0.5, -0.5);
+    }
+
+    matrixMultiply(mat, projection, mat);
+}