More shadowmappingchanges

2025-08-14 11:06:43 +02:00
parent 6537459b77
commit 7ab9e8a5e5
7 changed files with 100 additions and 70 deletions
@@ -7,4 +7,62 @@ namespace Seele {
 typedef glm::mat2 Matrix2;
 typedef glm::mat3 Matrix3;
 typedef glm::mat4 Matrix4;
+
+static Matrix4 perspectiveProjection(float fov, float aspect, float nearPlane, float farPlane) {
+    const float e = 1.0f / std::tan(fov * 0.5f);
+    return {
+        {
+            e / aspect,
+            0.0f,
+            0.0f,
+            0.0f,
+        },
+        {
+            0.0f,
+            -e,
+            0.0f,
+            0.0f,
+        },
+        {
+            0.0f,
+            0.0f,
+            0.5f * (farPlane + nearPlane) / (nearPlane - farPlane),
+            -1.0f,
+        },
+        {
+            0.0f,
+            0.0f,
+            (farPlane * nearPlane) / (nearPlane - farPlane),
+            0.0f,
+        },
+    };
+}
+static Matrix4 orthographicProjection(float left, float right, float bottom, float top, float nearPlane, float farPlane) {
+    return Matrix4{
+        {
+            2.0f / (right - left),
+            0.0f,
+            0.0f,
+            0.0f,
+        },
+        {
+            0.0f,
+            2.0f / (top - bottom),
+            0.0f,
+            0.0f,
+        },
+        {
+            0.0f,
+            0.0f,
+            -2.0f / (farPlane - nearPlane),
+            0.0f,
+        },
+        {
+            -(right + left) / (right - left),
+            -(top + bottom) / (top - bottom),
+            -(farPlane + nearPlane) / (farPlane - nearPlane),
+            1.0f,
+        },
+    };
+}
 } // namespace Seele