//clang++ geometry_test.cpp -o geometry_test `sdl2-config --cflags --libs` -lSDL2_ttf -std=c++17
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>

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("NotoSans-Light.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 useGeometry = false;
	if(argc > 1 && SDL_strncasecmp(argv[1], "geo", 3) == 0) {
		useGeometry = true;
	}

	printf("Render method: %s\n", useGeometry ? "SDL_RenderGeometry" : "SDL_RenderCopy");

	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);
		}
	}

	bool wantQuit=0;
	SDL_Event event;
	uint64_t frameCount = 0;
	uint64_t startTime = SDL_GetPerformanceCounter();
	while (!wantQuit) {
		while (SDL_PollEvent(&event)) {
			if (event.type == SDL_QUIT) {
				wantQuit = 1;
			}
		}

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

		if (!useGeometry) {
			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_RenderGeometry(renderer, texture, vertices, 90*24*6, 0, 0);
		}
		SDL_RenderPresent(renderer);

		frameCount += 1;
	}

	uint64_t endTime = SDL_GetPerformanceCounter();
	double timeTaken = ((double)((endTime - startTime) * 1000) / SDL_GetPerformanceFrequency()) / 1000.0;
	printf("%" SDL_PRIu64 " frames in %f seconds, %.02f average FPS\n", frameCount, timeTaken, (double)frameCount / timeTaken);

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