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#include <SDL.h>
#include <stdlib.h>
#include <errno.h>
#include "fb.h"
#include "settings.h"
/* sdl fb backend, everything sdl-specific in rototiller resides here. */
typedef struct sdl_fb_t {
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Texture *texture;
} sdl_fb_t;
typedef struct sdl_fb_page_t sdl_fb_page_t;
struct sdl_fb_page_t {
SDL_Surface *surface;
};
int sdl_fb_setup(const settings_t *settings, setting_desc_t **next_setting)
{
/* TODO: window size? fullscreen? vsync? etc. */
return 0;
}
void * sdl_fb_init(const settings_t *settings)
{
sdl_fb_t *c;
c = calloc(1, sizeof(sdl_fb_t));
if (!c)
return NULL;
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
free(c);
return NULL;
}
return c;
}
void sdl_fb_shutdown(void *context)
{
sdl_fb_t *c = context;
SDL_Quit();
free(c);
}
static int sdl_fb_acquire(void *context, void *page)
{
sdl_fb_t *c = context;
sdl_fb_page_t *p = page;
c->window = SDL_CreateWindow("rototiller", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
if (!c->window)
return -1;
c->renderer = SDL_CreateRenderer(c->window, -1, SDL_RENDERER_PRESENTVSYNC);
if (!c->renderer)
return -1;
c->texture = SDL_CreateTexture(c->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 640, 480);
if (!c->texture)
return -1;
return 0;
}
static void sdl_fb_release(void *context)
{
sdl_fb_t *c = context;
SDL_DestroyTexture(c->texture);
SDL_DestroyRenderer(c->renderer);
SDL_DestroyWindow(c->window);
}
static void * sdl_fb_page_alloc(void *context, fb_page_t *res_page)
{
sdl_fb_t *c = context;
sdl_fb_page_t *p;
p = calloc(1, sizeof(sdl_fb_page_t));
if (!p)
return NULL;
p->surface = SDL_CreateRGBSurfaceWithFormat(0, 640, 480, 32, SDL_PIXELFORMAT_RGB888);
res_page->fragment.buf = p->surface->pixels;
res_page->fragment.width = 640;
res_page->fragment.frame_width = 640;
res_page->fragment.height = 480;
res_page->fragment.frame_height = 480;
res_page->fragment.stride = p->surface->pitch - (640 * 4);
return p;
}
static int sdl_fb_page_free(void *context, void *page)
{
sdl_fb_t *c = context;
sdl_fb_page_t *p = page;
SDL_FreeSurface(p->surface);
free(p);
return 0;
}
static int sdl_ready()
{
SDL_Event ev;
/* It's important on Windows in particular to
* drain the event queue vs. just SDL_QuitRequested()
*/
while (SDL_PollEvent(&ev)) {
if (ev.type == SDL_QUIT)
return -EPIPE;
}
return 0;
}
static int sdl_fb_page_flip(void *context, void *page)
{
sdl_fb_t *c = context;
sdl_fb_page_t *p = page;
int r;
r = sdl_ready();
if (r < 0)
return r;
if (SDL_UpdateTexture(c->texture, NULL, p->surface->pixels, p->surface->pitch) < 0)
return -1;
if (SDL_RenderClear(c->renderer) < 0)
return -1;
if (SDL_RenderCopy(c->renderer, c->texture, NULL, NULL) < 0)
return -1;
SDL_RenderPresent(c->renderer);
return 0;
}
fb_ops_t sdl_fb_ops = {
.setup = sdl_fb_setup,
.init = sdl_fb_init,
.shutdown = sdl_fb_shutdown,
.acquire = sdl_fb_acquire,
.release = sdl_fb_release,
.page_alloc = sdl_fb_page_alloc,
.page_free = sdl_fb_page_free,
.page_flip = sdl_fb_page_flip
};
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