chore: initial commit

src/gx/Coordinate.cpp

@@ -0,0 +1,58 @@
+#include "gx/Coordinate.hpp"
+#include <cmath>
+
+namespace Coordinate {
+    float s_aspect = 1.333333f;
+    float s_aspectCompensation = 1.0f;
+    float s_y = 0.6f;
+    float s_x = 0.8f;
+}
+
+float CoordinateGetAspectCompensation() {
+    return Coordinate::s_aspectCompensation;
+}
+
+void CoordinateSetAspectRatio(float aspect) {
+    Coordinate::s_aspect = aspect;
+    Coordinate::s_aspectCompensation = aspect * 0.75;
+
+    float v1 = 1.0 / sqrt(aspect * aspect + 1.0);
+    Coordinate::s_y = v1;
+    Coordinate::s_x = aspect * v1;
+}
+
+void DDCToNDC(float ddcx, float ddcy, float* ndcx, float* ndcy) {
+    if (ndcx) {
+        *ndcx = ddcx / Coordinate::s_x;
+    }
+
+    if (ndcy) {
+        *ndcy = ddcy / Coordinate::s_y;
+    }
+}
+
+float DDCToNDCHeight(float ddcy) {
+    return ddcy / Coordinate::s_y;
+}
+
+float DDCToNDCWidth(float ddcx) {
+    return ddcx / Coordinate::s_x;
+}
+
+void NDCToDDC(float ndcx, float ndcy, float* ddcx, float* ddcy) {
+    if (ddcx) {
+        *ddcx = Coordinate::s_x * ndcx;
+    }
+
+    if (ddcy) {
+        *ddcy = Coordinate::s_y * ndcy;
+    }
+}
+
+float NDCToDDCHeight(float ndcy) {
+    return Coordinate::s_y * ndcy;
+}
+
+float NDCToDDCWidth(float ndcx) {
+    return Coordinate::s_x * ndcx;
+}