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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <memdraw.h>
#include <geometry.h>
#include "libobj/obj.h"
#include "graphics.h"
#include "internal.h"
static void
framebufctl_draw(Framebufctl *ctl, Image *dst)
{
Framebuf *fb;
lock(ctl);
fb = ctl->getfb(ctl);
loadimage(dst, rectaddpt(fb->r, dst->r.min), byteaddr(fb->cb, fb->r.min), bytesperline(fb->r, fb->cb->depth)*Dy(fb->r));
unlock(ctl);
}
static void
framebufctl_memdraw(Framebufctl *ctl, Memimage *dst)
{
Framebuf *fb;
lock(ctl);
fb = ctl->getfb(ctl);
memimagedraw(dst, dst->r, fb->cb, ZP, nil, ZP, SoverD);
unlock(ctl);
}
static void
framebufctl_swap(Framebufctl *ctl)
{
lock(ctl);
ctl->idx ^= 1;
unlock(ctl);
}
static void
framebufctl_reset(Framebufctl *ctl)
{
Framebuf *fb;
/* address the back buffer—resetting the front buffer is VERBOTEN */
fb = ctl->getbb(ctl);
memsetd(fb->zb, Inf(-1), Dx(fb->r)*Dy(fb->r));
memfillcolor(fb->cb, DTransparent);
}
static Framebuf *
framebufctl_getfb(Framebufctl *ctl)
{
return ctl->fb[ctl->idx]; /* front buffer */
}
static Framebuf *
framebufctl_getbb(Framebufctl *ctl)
{
return ctl->fb[ctl->idx^1]; /* back buffer */
}
Framebuf *
mkfb(Rectangle r)
{
Framebuf *fb;
fb = emalloc(sizeof *fb);
memset(fb, 0, sizeof *fb);
fb->cb = eallocmemimage(r, RGBA32);
fb->zb = emalloc(Dx(r)*Dy(r)*sizeof(*fb->zb));
memsetd(fb->zb, Inf(-1), Dx(r)*Dy(r));
fb->r = r;
return fb;
}
void
rmfb(Framebuf *fb)
{
free(fb->zb);
freememimage(fb->cb);
free(fb);
}
Framebufctl *
mkfbctl(Rectangle r)
{
Framebufctl *fc;
fc = emalloc(sizeof *fc);
memset(fc, 0, sizeof *fc);
fc->fb[0] = mkfb(r);
fc->fb[1] = mkfb(r);
fc->draw = framebufctl_draw;
fc->memdraw = framebufctl_memdraw;
fc->swap = framebufctl_swap;
fc->reset = framebufctl_reset;
fc->getfb = framebufctl_getfb;
fc->getbb = framebufctl_getbb;
return fc;
}
void
rmfbctl(Framebufctl *fc)
{
rmfb(fc->fb[1]);
rmfb(fc->fb[0]);
free(fc);
}
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