//clang++ geometry_test.cpp -lSDL2 -lSDL2_ttf -O2
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include <iostream>

int main(int argc, char* argv[])
{
	SDL_Init(SDL_INIT_VIDEO);
	auto window = SDL_CreateWindow("Geometry test", SDL_WINDOWPOS_CENTERED,  SDL_WINDOWPOS_CENTERED, 1920/2, 1080/2, SDL_WINDOW_SHOWN);
	TTF_Init();
	TTF_Font* font = TTF_OpenFont("/usr/share/fonts/noto/NotoSans-Regular.ttf", 12*2);
	
	SDL_Color color = {255, 255, 255, 255};
	auto surface = TTF_RenderText_Solid(font, "T", color);

	auto renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
	auto texture = SDL_CreateTextureFromSurface(renderer, surface);

	SDL_FreeSurface(surface);
	TTF_CloseFont(font);
	int tw = 0;
	int th = 0;
	SDL_QueryTexture(texture, NULL, NULL, &tw, &th);

	bool wantQuit=0;
	SDL_Event event;
	int fps=0, time=0;
	while (!wantQuit) {
		fps++;
		while (SDL_PollEvent(&event)) {
			if (event.type == SDL_QUIT) {
				wantQuit = 1;
			}
		}
		if (event.common.timestamp - time >= 1000) {
			if (event.common.timestamp - time >= 2000) { time = event.common.timestamp; time = event.common.timestamp; }
			else { printf("FPS: %d\n", fps); fps=1; time += 1000; }
		}

		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
		SDL_RenderClear(renderer);

		if (0) {
			for(int r=0; r<24; r++)
			for(int c=0; c<90; c++) {
				SDL_Rect dstRect = { c*(tw+3), r*(th+5), tw, th };
				SDL_RenderCopy(renderer, texture, 0, &dstRect);
			}
		} else {
			SDL_Vertex vertices[90*24*6];
			for(int r=0; r<24; r++)
			for(int c=0; c<90; c++)
			{
				float x = c*(tw+3);
				float y = r*(th+5);
				const SDL_Vertex verts[6] = {
					{ SDL_FPoint{ x, y },    SDL_Color{ 255, 0, 0, 255 }, SDL_FPoint{ 0, 0 }, },
					{ SDL_FPoint{ x+tw, y }, SDL_Color{ 0, 0, 255, 255 }, SDL_FPoint{ 1, 0 }, },
					{ SDL_FPoint{ x, y+th }, SDL_Color{ 0, 255, 0, 255 }, SDL_FPoint{ 0, 1 }, },

					{ SDL_FPoint{ x, y+th },    SDL_Color{ 0, 255, 0, 255 }, SDL_FPoint{ 0, 1 }, },
					{ SDL_FPoint{ x+tw, y },    SDL_Color{ 0, 0, 255, 255 }, SDL_FPoint{ 1, 0 }, },
					{ SDL_FPoint{ x+tw, y+th }, SDL_Color{ 0, 255, 0, 255 }, SDL_FPoint{ 1, 1 }, },
				};
				//*/
				/*
				const SDL_Vertex verts[6] = {
					{ SDL_FPoint{ x, y },    color, SDL_FPoint{ 0, 0 }, },
					{ SDL_FPoint{ x+tw, y }, color, SDL_FPoint{ 1, 0 }, },
					{ SDL_FPoint{ x, y+th }, color, SDL_FPoint{ 0, 1 }, },

					{ SDL_FPoint{ x, y+th },    color, SDL_FPoint{ 0, 1 }, },
					{ SDL_FPoint{ x+tw, y },    color, SDL_FPoint{ 1, 0 }, },
					{ SDL_FPoint{ x+tw, y+th }, color, SDL_FPoint{ 1, 1 }, },
				};
				//*/
				memcpy(vertices+((r*90)+c)*6, verts, sizeof(SDL_Vertex)*6);
			}
			SDL_RenderGeometry(renderer, texture, vertices, 90*24*6, 0, 0);
		}
		SDL_RenderPresent(renderer);
	}

	SDL_DestroyTexture(texture);
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	TTF_Quit();
	SDL_Quit();
}