ef9345_sdl2.c

/*
 *	6847 driver raster output for SDL2
 *
 *	There are lots of variants of this device that have subtle differences
 *	including NTSC and PAL versions.
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <SDL2/SDL.h>

#include "ef9345.h"
#include "ef9345_render.h"

extern int sdl_live;

/* RGB colours : only 8 used as we ignore the I hack */
static uint32_t ef9345_ctab[16] = {
    0xFF000000,
    0xFFFF0000,
    0xFF00FF00,
    0xFFFFFF00,
    0xFF0000FF,
    0xFF00FFFF,
    0xFFFFFF00,
    0xFFFFFFFF
};

struct ef9345_renderer {
    struct ef9345 *ef9345;
    SDL_Renderer *render;
    SDL_Texture *texture;
    SDL_Window *window;
};
    

void ef9345_render(struct ef9345_renderer *render)
{
    SDL_Rect sr;

    sr.x = 0;
    sr.y = 0;
    sr.w = 492;		/* 336 in 40 col mode */
    sr.h = 280;		/* Less for NTSC */

    SDL_UpdateTexture(render->texture, NULL, ef9345_get_raster(render->ef9345), 492 * 4);
    SDL_RenderClear(render->render);
    SDL_RenderCopy(render->render, render->texture, NULL, &sr);
    SDL_RenderPresent(render->render);
}

void ef8345_renderer_free(struct ef9345_renderer *render)
{
    if (render->texture)
        SDL_DestroyTexture(render->texture);
}


struct ef9345_renderer *ef9345_renderer_create(struct ef9345 *ef9345)
{
    struct ef9345_renderer *render;

    if (sdl_live == 0) {
        sdl_live = 1;
        if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
            fprintf(stderr, "SDL init failed: %s.\n", SDL_GetError());
            exit(1);
        }
        atexit(SDL_Quit);
    }

    render = malloc(sizeof(struct ef9345_renderer));
    if (render == NULL) {
        fprintf(stderr, "Out of memory.\n");
        exit(1);
    }
    memset(render, 0, sizeof(struct ef9345_renderer));
    render->ef9345 = ef9345;
    ef9345_set_colourmap(ef9345, ef9345_ctab);
    render->window = SDL_CreateWindow("EF9345",
        SDL_WINDOWPOS_UNDEFINED,
        SDL_WINDOWPOS_UNDEFINED,
        492 * 2, 560,
        SDL_WINDOW_RESIZABLE);
    if (render->window == NULL) {
        fprintf(stderr, "Unable to create window: %s.\n", SDL_GetError());
        exit(1);
    }
    render->render = SDL_CreateRenderer(render->window, -1, SDL_RENDERER_ACCELERATED);
    if (render->render == NULL) {
        fprintf(stderr, "Unable to create renderer: %s.\n", SDL_GetError());
        exit(1);
    }
    SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
    SDL_RenderSetLogicalSize(render->render, 492, 280);

    render->texture = SDL_CreateTexture(render->render,
                        SDL_PIXELFORMAT_ARGB8888,
                        SDL_TEXTUREACCESS_STREAMING,
                        492, 280);
    if (render->render == NULL) {
        fprintf(stderr, "Unable to create renderer: %s.\n", SDL_GetError());
        exit(1);
    }
    SDL_SetRenderDrawColor(render->render, 0, 0, 0, 255);
    SDL_RenderClear(render->render);
    SDL_RenderPresent(render->render);
    return render;
}