d3d_projection_2d_determinant

GM82Project · Aug 28, 2024 · 45dc854 · 45dc854
1 parent 4d5de33
commit 45dc854
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Showing 2 changed files with 15 additions and 0 deletions.
diff --git a/gm82dx9.gej b/gm82dx9.gej
@@ -2215,6 +2215,15 @@
 					],
 					"returntype": 2
 				},
+				{
+					"name": "d3d_projection_2d_determinant",
+					"extname": "",
+					"calltype": 2,
+					"helpline": "d3d_projection_2d_determinant()",
+					"hidden": false,
+					"argtypes": [],
+					"returntype": 2
+				},
 				{
 					"name": "d3d_set_alphablend",
 					"extname": "",

diff --git a/source/transform.cpp b/source/transform.cpp
@@ -37,6 +37,12 @@ GMREAL d3d_transform_get_determinant() {
     return XMVectorGetX(XMMatrixDeterminant(world_matrix));
 }
 
+GMREAL d3d_projection_2d_determinant() {
+    XMMATRIX M;
+    Device->GetTransform(D3DTS_PROJECTION,reinterpret_cast<D3DMATRIX*>(&M));
+    return XMVectorGetX(M.r[0]) * XMVectorGetY(M.r[1]) - XMVectorGetY(M.r[0]) * XMVectorGetX(M.r[1]);
+}
+
 // Glossary:
 //   C: rotation component (either x, y or z)
 //   CC: 2 rotation components (different components in any order)