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#include <stdio.h>
#include <windows.h>
#include "math/math.h"
#include "util/assert.h"
#include "ssr.h"
#include "example/example.h"
#include "extern/wog.h"
#include "extend/camera.h"

#define SCREEN_WIDTH 600
#define SCREEN_HEIGHT 500

typedef void(*F)(void*);
F onload;
F onupdate;
F onevent;
F ondraw;

/*macro这里需要绕一下弯*/
/*https://stackoverflow.com/questions/1489932/how-to-concatenate-twice-with-the-c-preprocessor-and-expand-a-macro-as-in-arg*/
#define SETEXAMPLEF(f, e) \
f = f##_##e;

#define SETEXAMPLE(i) \
SETEXAMPLEF(onload, i)\
SETEXAMPLEF(ondraw, i)\
SETEXAMPLEF(onevent, i)\
SETEXAMPLEF(onupdate, i)

int main(int argc, char* argv[]) {
	wog_Window* wnd = wog_createWindow("Soft Shader Room", SCREEN_WIDTH, SCREEN_HEIGHT, 500, 500, 0);
	wog_show(wnd);
	wog_Surface* surface = wog_getsurface(wnd); // ARGB format
	/* init ssr */
	ssr_Config config = {
		SCREEN_WIDTH, SCREEN_HEIGHT,
		0,
		surface->buffer
	};
	ssr_init(&config);
	SETEXAMPLE(EXAMPLECUR);
	onload(NULL);
	/*set up global camera*/
	Camera cam;
	camera_init(&cam);
	/* main loop */
	uint prev = wog_tick();
	uint dt = 0;
	uint frame_count = 0;
	uint time_stamp = 0;
	wog_Event e;
	while (1) {
		while (wog_pollEvent(wnd, &e)) {
			camera_onevent(&cam, &e);
			if (e.type == WOG_ECLOSE) {
				goto quit;
			} else {
				onevent(&e);
			}
		}
	
		dt = wog_tick() - prev;
		prev += dt;
		time_stamp += dt;
		++frame_count;
		if (time_stamp >= 1000) {
			printf("%3d fps\n", frame_count);
			time_stamp -= 1000;
			frame_count = 0;
		}
	
		onupdate(&dt);

		/*set vp matrix*/
		ssr_matrixmode(MATRIX_PROJECTION);
		camera_getprojmatrix(&cam, NULL);
		ssr_loadmatrix(&cam.proj_matrix);
		ssr_matrixmode(MATRIX_VIEW);
		camera_getviewmatrix(&cam, NULL);
		ssr_loadmatrix(&cam.view_matrix);
		ssr_matrixmode(MATRIX_MODEL);

		ondraw(NULL);

		ssr_present();
		wog_updateSurface(wnd);
		//Sleep(1); /*reduce cpu using*/
	}
	
	quit:
	wog_destroyWindow(wnd);

	return 0;
}