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Add hires graphics file; draw hires graphics
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@ -6,6 +6,7 @@
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extern void apple2_draw(apple2 *);
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extern void apple2_draw_40col(apple2 *);
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extern void apple2_draw_hires(apple2 *);
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extern void apple2_draw_lores(apple2 *);
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extern void apple2_draw_pixel(apple2 *, vm_16bit);
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8
include/apple2.hires.h
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8
include/apple2.hires.h
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@ -0,0 +1,8 @@
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#ifndef _APPLE2_HIRES_H_
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#define _APPLE2_HIRES_H_
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#include "apple2.h"
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extern void apple2_hires_draw(apple2 *, size_t);
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#endif
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@ -6,6 +6,7 @@ set(erc_sources
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apple2.dec.c
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apple2.draw.c
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apple2.enc.c
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apple2.hires.c
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apple2.kb.c
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apple2.lores.c
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apple2.mem.c
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@ -7,6 +7,7 @@
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*/
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#include "apple2.h"
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#include "apple2.hires.h"
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#include "apple2.lores.h"
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#include "apple2.text.h"
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@ -96,6 +97,21 @@ apple2_draw_lores(apple2 *mach)
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}
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}
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/*
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* Draw high-resolution graphics on the screen
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*/
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void
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apple2_draw_hires(apple2 *mach)
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{
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size_t addr;
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vm_screen_prepare(mach->screen);
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for (addr = 0x2000; addr < 0x4000; addr++) {
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apple2_hires_draw(mach, addr);
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}
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}
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/*
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* Find the right draw method for the machine, based on its display
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* mode, and use that to refresh the screen.
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@ -106,7 +122,11 @@ apple2_draw(apple2 *mach)
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if (mach->display_mode & DISPLAY_TEXT) {
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apple2_draw_40col(mach);
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return;
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} else if (mach->memory_mode & MEMORY_HIRES) {
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apple2_draw_hires(mach);
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return;
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}
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// The fallback mode is to draw lores graphics
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apple2_draw_lores(mach);
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}
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24
src/apple2.hires.c
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24
src/apple2.hires.c
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@ -0,0 +1,24 @@
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/*
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* apple2.hires.c
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*
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* High resolution graphics in Apple are a significant change from its
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* low-resolution graphics. Where one byte can hold the color data for
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* two onscreen cells in lores graphics, in hires, each _bit_
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* corresponds to a pixel. The colors you can show depend on the pattern
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* of high and low bits within a given data byte. Certain rows have
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* black, purple, or blue available; alternating rows can be black,
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* green, or orange.
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*
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* Some of this has to do with the space constraints available to the
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* Apple II: the hires graphics buffer is held between $2000 and $3FFF,
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* which is only 8k RAM. Some of this has to do with the peculiarities
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* of the NTSC format, because the Apple II was designed to work with
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* standard television screens.
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*/
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#include "apple2.hires.h"
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void
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apple2_hires_draw(apple2 *mach, size_t addr)
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{
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}
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10
tests/apple2.hires.c
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10
tests/apple2.hires.c
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#include <criterion/criterion.h>
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#include "apple2.hires.h"
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#include "apple2.tests.h"
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TestSuite(apple2_hires, .init = setup, .fini = teardown);
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Test(apple2_hires, draw)
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{
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}
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