xormod/xormod.c

#include "EGA8x8.h"
#include "field.h"
#include "font.h"
#include "picture.h"
#include "platform.h"
#include "types.h"

#include <stdio.h>
#include <SDL.h>

int main() {

    int w = 1280, h = 720;

    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
        fprintf(stderr, "Can't init: %s\n", SDL_GetError());
        return -1;
    }

    SDL_Window *window = SDL_CreateWindow("xormod",
        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w, h,
        ACCEL_PLATFORM);
    if (window == NULL) {
        fprintf(stderr, "Can't open window: %s\n", SDL_GetError());
        return -1;
    }

    SDL_GetWindowSize(window, &w, &h);

    SDL_Renderer *rend = SDL_CreateRenderer(window, -1,
        SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);

    SDL_Texture *font = load_font(rend);

    Field f;
    Field_init(&f, rend, w, h);

    struct int2 mouse_prev = { -1, -1 };
    int running = 1;
    while (running) {
        const uint8_t *keys = SDL_GetKeyboardState(NULL);
        if (keys[SDL_SCANCODE_ESCAPE] || keys[SDL_SCANCODE_Q]) {
            break;
        }
        if (keys[SDL_SCANCODE_LEFT]) {
            f.offset.x -= 16;
        }
        if (keys[SDL_SCANCODE_RIGHT]) {
            f.offset.x += 16;
        }
        if (keys[SDL_SCANCODE_UP]) {
            f.offset.y -= 16;
        }
        if (keys[SDL_SCANCODE_DOWN]) {
            f.offset.y += 16;
        }
        
        struct int2 mouse;
        if (SDL_GetMouseState(&mouse.x, &mouse.y) & SDL_BUTTON(SDL_BUTTON_LEFT)) {
            if (mouse_prev.x != -1 ) {
                f.offset.x -= mouse.x - mouse_prev.x;
                f.offset.y -= mouse.y - mouse_prev.y;
            }
            mouse_prev = mouse;
        } else if (mouse_prev.x != -1) {
            mouse_prev = (struct int2) { -1, -1 };
        }

        Field_scroll(&f, rend);
        Field_draw(&f, rend);

        char buf[72];
        SDL_SetRenderDrawColor(rend, 0, 0, 0, 255);
        SDL_RenderFillRect(rend, &(SDL_Rect) {
            0, 0, sizeof(buf)*font_w, 8*font_h
        });

        draw_text(rend, font, ACCEL_PLATFORM_STR, sizeof(ACCEL_PLATFORM_STR), RC(1,1), 255, 255, 255);

        size_t len = snprintf(buf, sizeof(buf),
            "off.x: %d, off.y: %d", f.offset.x, f.offset.y);
        draw_text(rend, font, buf, len, RC(2, 1), 255, 255, 255);

        char *q[] = {"TL", "TR", "BL", "BR"};
        for (int i = 0; i < 4; i++) {
            Picture *p = f.pics[i];
            len = snprintf(buf, sizeof(buf), "%s| x1: %05d, x2: %05d, y1: %05d, y2: %05d, p: %p",
                q[i], p->x1, p->x2, p->y1, p->y2, p);
            draw_text(rend, font, buf, len, RC(3+i, 1), 255, 255, 255);
        }

        SDL_RenderPresent(rend);

        SDL_Event e;
        while (SDL_PollEvent(&e)) {
            if (e.type == SDL_QUIT) {
                running = 0;
            }
        }
    }

    SDL_DestroyRenderer(rend);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}