chore: Initial commit

src/renderer.hpp

@@ -0,0 +1,79 @@
+#pragma once
+
+#include <stdio.h>
+
+#include <SDL3/SDL.h>
+
+#include "math.hpp"
+
+namespace dxd
+{
+
+class Renderer
+{
+private:
+	SDL_Renderer *_sdl;
+	int _width, _height;
+	vec2 _center;
+	float _scale;
+
+	float to_screenf(float f)
+	{
+		//FIXME: Aspect ratio
+		return (f/2) * _height;
+	}
+	vec2 to_screenv2(vec2 p)
+	{
+		//TODO: Handle aspect ratio
+		return {
+			.x = ((p.x/2) + .5f) * _height,
+			.y = (.5f - (p.y/2)) * _height,
+		};
+	}
+
+	float to_viewf(float f)
+	{
+		return f * _scale;
+	}
+	vec2 to_viewv2(vec2 p)
+	{
+		return {
+			.x = (p.x - _center.x) * _scale,
+			.y = (p.y - _center.y) * _scale,
+		};
+	}
+
+public:
+	Renderer(SDL_Renderer *sdl, int width, int height) : _sdl(sdl), _width(width), _height(height)
+	{
+		_center = { 0, 0 };
+		_scale = 1;
+	}
+
+	void color(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+	{
+		SDL_SetRenderDrawColor(_sdl, r, g, b, a);
+	}
+
+	void line(vec2 a, vec2 b)
+	{
+		vec2 as = to_screenv2(to_viewv2(a)), bs = to_screenv2(to_viewv2(b));
+		SDL_RenderLine(_sdl, as.x, as.y, bs.x, bs.y);
+	}
+
+	void dot(vec2 center, float size)
+	{
+		vec2 view = to_viewv2(center - vec2_one * (size/2));
+		vec2 screen = to_screenv2(view);
+		float scr_size = to_screenf(to_viewf(size));
+		SDL_FRect rect = {
+			.x = screen.x,
+			.y = screen.y - scr_size, //HACK: Do this somewhere else? Rect function?
+			.w = scr_size,
+			.h = scr_size,
+		};
+		SDL_RenderFillRect(_sdl, &rect);
+	}
+};
+
+} // namespace dxd