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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
#ifndef _VM_SCREEN_H_
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#define _VM_SCREEN_H_
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#include <stdbool.h>
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#include <SDL.h>
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typedef struct {
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/*
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* These are the x and y coordinate offsets in the logical dimension
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* established in a vm_screen. An offset of (0, 0) would be in the
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* top-left; (5, 5) would be 5 pixels down, and 5 pixels to the
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* right, of that top-left corner.
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*/
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int xoff;
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int yoff;
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/*
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* These are the width and height of the area we're defining. A
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* single pixel in the logical area would have a width and height of
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* (1, 1); use larger numbers to indicate a larger square (if the
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* two are equal) or rectangle (if unequal).
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*/
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int width;
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int height;
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} vm_area;
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typedef struct {
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/*
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* This is the window in SDL that we're displaying. It's fine for a
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* screen to be headless; that is, not to have a window. Screen
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* functions which deal with SDL will simply not run that code if
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* headless.
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*/
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SDL_Window *window;
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/*
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* In SDL, the renderer is comparable to the old SDL_Surface type
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* (which is still there!). A renderer is a little more stateful; it
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* contains its own color information to be used when rendering
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* shapes, for example.
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*/
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SDL_Renderer *render;
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/*
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* These are the x and y coordinates of the window we're creating.
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* FIXME: this should probably be renamed to width and height...
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*/
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int xcoords;
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int ycoords;
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} vm_screen;
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/*
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* Set the contents of an SDL_Rect to the equivalent fields contained in
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* a vm_area.
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*/
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#define SET_SDL_RECT(name, a) \
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(name).x = (a).xoff; \
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(name).y = (a).yoff; \
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(name).w = (a).width; \
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(name).h = (a).height
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/*
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* Much like SET_SDL_RECT(), except this will (as a side-effect!)
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* declare an SDL_Rect variable (`name`) and pass that into the SET
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* macro.
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*/
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#define MAKE_SDL_RECT(name, a) \
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SDL_Rect name; \
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SET_SDL_RECT(name, a)
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extern bool vm_screen_active(vm_screen *);
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extern void vm_area_set(vm_area *, int, int, int, int);
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extern int vm_screen_add_window(vm_screen *, int, int);
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extern int vm_screen_init();
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extern int vm_screen_xcoords(vm_screen *);
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extern int vm_screen_ycoords(vm_screen *);
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extern vm_screen *vm_screen_create();
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extern void vm_screen_draw_rect(vm_screen *, vm_area *);
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extern void vm_screen_finish();
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extern void vm_screen_free(vm_screen *);
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extern void vm_screen_refresh(vm_screen *);
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extern void vm_screen_set_color(vm_screen *, uint8_t, uint8_t, uint8_t, uint8_t);
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extern void vm_screen_set_logical_coords(vm_screen *, int, int);
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#endif
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