initial commit

src/renderer/camera.cpp

@@ -0,0 +1,53 @@
+// please do not touch this code.
+// it is a waste of time looking at this code.
+// please, dont. if you do continue, edit the value below
+// as a warning for future you.
+
+// hoursWasted = 2
+
+#include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
+#include <cmath>
+
+#include "renderer/camera.hpp"
+#include "globals.hpp"
+
+DeltaCamera::DeltaCamera(float x, float y, float z) {
+    pos = DeltaVector3(x, y, z);
+    angle = DeltaVector2();
+}
+
+DeltaVector2 DeltaCamera::projectPointVec(const DeltaVector3 &worldPos) {
+    DeltaVector3 calculatedPos; DeltaVector2 projected;
+    float sineX = std::sin(angle.x);
+    float cosineX = std::cos(angle.x);
+
+    float sineY = std::sin(angle.y);
+    float cosineY = std::cos(angle.y);
+
+    // yaw translate
+
+    calculatedPos.x = (worldPos.x - pos.x) * cosineX - (worldPos.y - pos.y) * sineX;
+    calculatedPos.y = (worldPos.y - pos.y) * cosineX + (worldPos.x - pos.x) * sineX;
+    calculatedPos.z = (worldPos.z - pos.z);
+
+    // pitch translate
+
+    calculatedPos.y = calculatedPos.y * cosineY - calculatedPos.z * sineY;
+    calculatedPos.z = calculatedPos.y * sineY + calculatedPos.z * cosineY;
+    // dont touch calculatedPos.x
+
+    projected.x = calculatedPos.x * FOCAL / calculatedPos.y + SIMULATED_WIDTH / 2;
+    projected.y = calculatedPos.y * FOCAL / calculatedPos.y + SIMULATED_HEIGHT / 2;
+
+    // now gotta convert y to our y
+    projected.y = SIMULATED_HEIGHT - projected.y;
+
+    // we are done =D
+    return projected;
+}
+
+DeltaVector2 DeltaCamera::projectPoint(float worldX, float worldY, float worldZ) {
+    // simple conversion, dont iterate further
+    return projectPointVec({ worldX, worldY, worldZ });
+}