Initial commit

src/mmatrix.cpp

@@ -0,0 +1,46 @@
+// Address: 0x001BB690
+// Matching: yes
+HRESULT __stdcall initMatrices(unsigned const count) {
+/* Initialize the matrix stack with the given number of matrices.
+The requested number of matrices is rounded up to the nearest multiple of two.
+The initialized matrices are accessible through g_matrices.
+*/
+	// Allocate matrices
+	unsigned     i    = (count + 1) & 0xFFFFFFFE; // Round up
+	Mat4 * const mats = (Mat4 *)VirtualAlloc(
+		NULL,
+		(i + 2) * sizeof *mats,
+		MEM_COMMIT|MEM_RESERVE,
+		PAGE_READWRITE
+	);
+	if (mats != NULL) {
+		Mat4 * mat = mats + 2;
+
+		// Initialize each matrix to identity
+		if (i > 0) for (; i > 0; i--) {
+			float * entry = (float *)mat;
+
+			for (unsigned j = 0; j < sizeof *mat/sizeof *entry; j++) {
+				*entry  = 0;
+				entry  += 1;
+			}
+
+			(*mat)[3].w = 1;
+			(*mat)[2].z = 1;
+			(*mat)[1].y = 1;
+			(*mat)[0].x = 1;
+			mat++;
+		}
+
+		// Assign to g_matrices for later access
+		mat            = mats + 2;
+		g_matrices[1]  = mats;
+		g_matrices[2]  = mat;
+		g_matrices[0]  = mats;
+		g_matricesHead = g_matrices + 2;
+
+		return ERROR_SUCCESS;
+	}
+
+	return E_OUTOFMEMORY;
+}