GPU: Add display rotation option

src/common/gsvector.cpp

@@ -0,0 +1,67 @@
+// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
+
+#include "gsvector.h"
+
+#include <cmath>
+
+GSMatrix2x2::GSMatrix2x2(float e00, float e01, float e10, float e11)
+{
+  E[0][0] = e00;
+  E[0][1] = e01;
+  E[1][0] = e10;
+  E[1][1] = e11;
+}
+
+GSMatrix2x2 GSMatrix2x2::operator*(const GSMatrix2x2& m) const
+{
+  GSMatrix2x2 ret;
+  ret.E[0][0] = E[0][0] * m.E[0][0] + E[0][1] * m.E[1][0];
+  ret.E[0][1] = E[0][0] * m.E[0][1] + E[0][1] * m.E[1][1];
+  ret.E[1][0] = E[1][0] * m.E[0][0] + E[1][1] * m.E[1][0];
+  ret.E[1][1] = E[1][0] * m.E[0][1] + E[1][1] * m.E[1][1];
+  return ret;
+}
+
+GSVector2 GSMatrix2x2::operator*(const GSVector2& v) const
+{
+  return GSVector2(row(0).dot(v), row(1).dot(v));
+}
+
+GSMatrix2x2 GSMatrix2x2::Identity()
+{
+  GSMatrix2x2 ret;
+  ret.E[0][0] = 1.0f;
+  ret.E[0][1] = 0.0f;
+  ret.E[1][0] = 0.0f;
+  ret.E[1][1] = 1.0f;
+  return ret;
+}
+
+GSMatrix2x2 GSMatrix2x2::Rotation(float angle_in_radians)
+{
+  const float sin_angle = std::sin(angle_in_radians);
+  const float cos_angle = std::cos(angle_in_radians);
+
+  GSMatrix2x2 ret;
+  ret.E[0][0] = cos_angle;
+  ret.E[0][1] = -sin_angle;
+  ret.E[1][0] = sin_angle;
+  ret.E[1][1] = cos_angle;
+  return ret;
+}
+
+GSVector2 GSMatrix2x2::row(size_t i) const
+{
+  return GSVector2::load(&E[i][0]);
+}
+
+GSVector2 GSMatrix2x2::col(size_t i) const
+{
+  return GSVector2(E[0][i], E[1][i]);
+}
+
+void GSMatrix2x2::store(void* m)
+{
+  std::memcpy(m, E, sizeof(E));
+}