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Implement split-screen footer

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This commit is contained in:
Jeremy Penner 2019-01-06 21:29:20 -05:00
parent 1b87ca8aa3
commit 7abb774dfb
3 changed files with 26 additions and 23 deletions
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footer.tif Executable file
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49
testbed.c
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@ -33,9 +33,18 @@ typedef struct {
unsigned int i[16]; unsigned int i[16];
} Tile_t; } Tile_t;
unsigned int PAGE[] = { 0x00, 0x20, 0x40, 0x60 }; unsigned int PAGE[] = { 0x04, 0x24 };
// todo: HIGH BITS??
#define setWriteMode(m) outport(REG_GDC, 0x05 | m << 8) #define setWriteMode(m) outport(REG_GDC, 0x05 | m << 8)
void setSplitScreen(unsigned int y) {
// TODO: VGA registers??
outport(REG_CRTC, 0x1018);// | y << 8);
outport(REG_CRTC, 0x0107);
}
void unsetSplitScreen() {
outport(REG_CRTC, 0xff18);
outport(REG_CRTC, 0x1107);
}
void prepareEgaMemCopy() { void prepareEgaMemCopy() {
setAllPlanes(); setAllPlanes();
@ -51,20 +60,6 @@ void blitTile(unsigned int offsetFrom, unsigned int offsetTo) {
} }
} }
#if 0
void blitTile(Tile_t *tile, int plane, unsigned int page, unsigned int x, unsigned int y) {
unsigned int *data = tile->b + (plane << 4);
volatile unsigned int far *out = (volatile unsigned int far *)
&VID[(y * 640) + (x << 1) + (page << 8)];
int i;
for (i = 0; i < 320; i += 20) {
out[i] = *(data++);
}
}
#endif
#define flipPage(p) outport(REG_CRTC, 0x0c | (p << 8)) #define flipPage(p) outport(REG_CRTC, 0x0c | (p << 8))
/*** K E Y B O A R D ***/ /*** K E Y B O A R D ***/
@ -360,14 +355,14 @@ int tifLoadEGA(FILE *f, TifImageMeta_t meta, unsigned int vidOffset, int maxY) {
int gpair = (pixelpair & 0x02) >> 1 | (pixelpair & 0x20) >> 4; int gpair = (pixelpair & 0x02) >> 1 | (pixelpair & 0x20) >> 4;
int rpair = (pixelpair & 0x04) >> 2 | (pixelpair & 0x40) >> 5; int rpair = (pixelpair & 0x04) >> 2 | (pixelpair & 0x40) >> 5;
int ipair = (pixelpair & 0x08) >> 3 | (pixelpair & 0x80) >> 6; int ipair = (pixelpair & 0x08) >> 3 | (pixelpair & 0x80) >> 6;
int shift = (ipixelpair % 4) << 1; int shift = (3 - (ipixelpair % 4)) << 1;
b |= bpair << shift; b |= bpair << shift;
g |= gpair << shift; g |= gpair << shift;
r |= rpair << shift; r |= rpair << shift;
i |= ipair << shift; i |= ipair << shift;
if (shift == 6 || ipixelpair == ipixelpairLim - 1) { if (shift == 0 || ipixelpair == ipixelpairLim - 1) {
// todo: use write mode 2, this is slooww // todo: use write mode 2, this is slooww
setPlane(PLANE_B); *out = b; setPlane(PLANE_B); *out = b;
setPlane(PLANE_R); *out = r; setPlane(PLANE_R); *out = r;
@ -478,7 +473,14 @@ int main() {
unsigned int page = 0; unsigned int page = 0;
#define OFF_TILES 0x4200 #define OFF_TILES 0x4200
setEGAMode(); setEGAMode();
atexit(vid_cleanup);
f = fopen("FOOTER.TIF", "rb");
meta = tifLoadMeta(f);
tifLoadEGA(f, meta, 0, 24);
fclose(f);
f = fopen("TILES.TIF", "rb"); f = fopen("TILES.TIF", "rb");
meta = tifLoadMeta(f); meta = tifLoadMeta(f);
@ -487,21 +489,22 @@ int main() {
mouse_init(); mouse_init();
kbd_init(); kbd_init();
atexit(vid_cleanup);
while (!keyPressed(K_ESC)) { while (!keyPressed(K_ESC)) {
page ^= 0x20; page ^= 1;
prepareEgaMemCopy(); prepareEgaMemCopy();
drawOffset = page << 8; drawOffset = PAGE[page] << 8;
for (y = 0; y < 13; y ++) { for (y = 0; y < 11; y ++) {
for (x = 0; x < 20; x ++) { for (x = 0; x < 20; x ++) {
blitTile(OFF_TILES + ((((x + y + z) >> 2) % 3) << 5), drawOffset); blitTile(OFF_TILES + ((((x + y + z) >> 2) % 3) << 5), drawOffset);
drawOffset += 2; drawOffset += 2;
} }
drawOffset += 600; // 40 bytes per line * 15 more lines drawOffset += 600; // 40 bytes per line * 15 more lines
} }
flipPage(page);
flipPage(PAGE[page]);
setSplitScreen(16);
kbd_wait(); kbd_wait();
z++; z++;

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testbed.exe
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