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sdl2: add SDL_LockTexture and SDL_UnlockTexture

--- a/include/npe/SDL2/SDL.h

+++ b/include/npe/SDL2/SDL.h

@@ -159,6 +159,8 @@

 int SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Color *colors, int firstcolor, int ncolors);

 int SDL_BlitSurface(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);

 int SDL_SoftStretch(SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, const SDL_Rect *dstrect);

+int SDL_LockTexture(SDL_Texture *texture, const SDL_Rect *rect, void **pixels, int *pitch);

+int SDL_UnlockTexture(SDL_Texture *texture);

 enum {

 	SDL_QUERY = -1,

--- a/libnpe_sdl2/sdl2.c

+++ b/libnpe_sdl2/sdl2.c

@@ -254,6 +254,24 @@

 }

 int

+SDL_LockTexture(SDL_Texture *t, const SDL_Rect *re, void **pixels, int *pitch)

+{

+	Rectangle r;

+

+	r = re ? Rect(re->x, re->y, re->x+re->w, re->y+re->h) : t->m->r;

+	*pitch = Dx(r)*(t->m->depth/8);

+	*pixels = t->m->data->bdata;

+	return 0;

+}

+

+int

+SDL_UnlockTexture(SDL_Texture *t)

+{

+	USED(t);

+	return 0;

+}

+

+int

 SDL_UpdateTexture(SDL_Texture *t, SDL_Rect *re, void *pixels, int pitch)

 {

 	Rectangle r;