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Implement rect change stack

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This commit is contained in:
Peter Evans 2018-04-04 22:01:46 -05:00
parent d8e0159de0
commit 616bfdcc58
1 changed files with 53 additions and 6 deletions
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59
src/vm_screen.c
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@ -15,6 +15,28 @@
#include "vm_event.h" #include "vm_event.h"
#include "vm_screen.h" #include "vm_screen.h"
typedef struct {
/*
* The point coordinates of the change on-screen that we are looking
* to make
*/
vm_area area;
/*
* The new color of the pixel
*/
vm_color clr;
} change;
/*
* An array of changes, arranged in a stack, plus the position in the
* stack where we currently are at.
*/
static change changestack[65536];
static int changepos = 0;
static vm_color curcolor;
struct timeval refresh_time; struct timeval refresh_time;
/* /*
@ -205,7 +227,7 @@ vm_screen_active(vm_screen *scr)
void void
vm_screen_prepare(vm_screen *scr) vm_screen_prepare(vm_screen *scr)
{ {
//SDL_RenderClear(scr->render); SDL_RenderClear(scr->render);
} }
/* /*
@ -213,10 +235,22 @@ vm_screen_prepare(vm_screen *scr)
* made recently. * made recently.
*/ */
void void
vm_screen_refresh(vm_screen *screen) vm_screen_refresh(vm_screen *scr)
{ {
SDL_RenderPresent(screen->render); change *chg;
screen->dirty = false;
while (changepos >= 0) {
chg = &changestack[changepos--];
SDL_SetRenderDrawColor(scr->render, chg->clr.r, chg->clr.g,
chg->clr.b, SDL_ALPHA_OPAQUE);
MAKE_SDL_RECT(rect, chg->area);
SDL_RenderFillRect(scr->render, &rect);
}
SDL_RenderPresent(scr->render);
scr->dirty = false;
} }
/* /*
@ -229,6 +263,8 @@ vm_screen_set_color(vm_screen *scr, vm_color clr)
SDL_SetRenderDrawColor(scr->render, clr.r, clr.g, clr.b, SDL_SetRenderDrawColor(scr->render, clr.r, clr.g, clr.b,
SDL_ALPHA_OPAQUE); SDL_ALPHA_OPAQUE);
} }
curcolor = clr;
} }
/* /*
@ -238,11 +274,22 @@ vm_screen_set_color(vm_screen *scr, vm_color clr)
void void
vm_screen_draw_rect(vm_screen *screen, vm_area *area) vm_screen_draw_rect(vm_screen *screen, vm_area *area)
{ {
change *chg;
// FIXME: magic number
if (changepos >= 65536) {
return;
}
chg = &changestack[changepos++];
memcpy(&chg->area, area, sizeof(vm_area));
chg->clr = curcolor;
// The renderer will take care of translating the positions and // The renderer will take care of translating the positions and
// sizes into whatever the window is really at. // sizes into whatever the window is really at.
MAKE_SDL_RECT(rect, *area); //MAKE_SDL_RECT(rect, *area);
SDL_RenderFillRect(screen->render, &rect); //SDL_RenderFillRect(screen->render, &rect);
screen->dirty = true; screen->dirty = true;
} }