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smooth horizontal scrolling

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This commit is contained in:
Jeremy Penner 2019-01-19 16:29:32 -05:00
parent d676190aaf
commit b1366fe3b2
2 changed files with 21 additions and 15 deletions
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36
testbed.c
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@ -9,6 +9,7 @@
#define setEGAMode() setMode(000Dh) #define setEGAMode() setMode(000Dh)
#define setTextMode() setMode(0003h) #define setTextMode() setMode(0003h)
#define REG_AC 0x03c0
#define REG_TS 0x03c4 #define REG_TS 0x03c4
#define REG_GDC 0x03ce #define REG_GDC 0x03ce
#define REG_CRTC 0x03d4 #define REG_CRTC 0x03d4
@ -56,6 +57,12 @@ void setDisplayOffset(unsigned int offset) {
outport(REG_CRTC, 0x0d | (offset << 8)); outport(REG_CRTC, 0x0d | (offset << 8));
} }
void setHorizontalPan(int offset) {
inp(0x3da); // INPUT_STATUS_1?
outp(REG_AC, 0x13 | 0x20);
outp(REG_AC, offset);
}
#define setLogicalWidth(w) outport(REG_CRTC, 0x13 | (w << 8)) #define setLogicalWidth(w) outport(REG_CRTC, 0x13 | (w << 8))
/*** K E Y B O A R D ***/ /*** K E Y B O A R D ***/
@ -462,7 +469,7 @@ int tifLoad(FILE *f, TifImageMeta_t meta, unsigned int *planeBuf, int maxY, int
// 89ABCDEF 01234567 << 3 => BCDEFXXX 3456789A byteswap => 3456789A BCDEFXXX // 89ABCDEF 01234567 << 3 => BCDEFXXX 3456789A byteswap => 3456789A BCDEFXXX
#define PAGE_TILES_W 21 #define PAGE_TILES_W 21
#define PAGE_TILES_H 13 #define PAGE_TILES_H 12
#define PAGE_TILES_COUNT (PAGE_TILES_H * PAGE_TILES_W) #define PAGE_TILES_COUNT (PAGE_TILES_H * PAGE_TILES_W)
#define PAGE_STRIDE (PAGE_TILES_W << 1) #define PAGE_STRIDE (PAGE_TILES_W << 1)
@ -504,7 +511,7 @@ typedef struct {
unsigned char firstBuffer; unsigned char firstBuffer;
} TiledScreen_t; } TiledScreen_t;
TiledScreen_t screen = { 0, 0, 0, 0, { 0x0400, 0x2620 }, 0, 0, NULL, NULL, TiledScreen_t screen = { 0, 0, 0, 0, { 0x0400, 0x2400 }, 0, 0, NULL, NULL,
0, 0, 0, 0, 0 }; 0, 0, 0, 0, 0 };
void loadTiles(unsigned int tilesOffset, unsigned int *memTiles) { void loadTiles(unsigned int tilesOffset, unsigned int *memTiles) {
@ -578,8 +585,8 @@ void drawSpriteToBuf(unsigned int *sprite, int pageX, int pageY, int shift, int
} }
void drawSprite(unsigned int *sprite, int x, int y) { void drawSprite(unsigned int *sprite, int x, int y) {
int pageX = (x - (screen.scrollX & 0xfff0)) >> 4; int pageX = (int)(x - (screen.scrollX & 0xfff0)) >> 4;
int pageY = (y - (screen.scrollY & 0xfff0)) >> 4; int pageY = (int)(y - (screen.scrollY & 0xfff0)) >> 4;
int pageOffsetX = x & 0x0f; int pageOffsetX = x & 0x0f;
int pageOffsetY = y & 0x0f; int pageOffsetY = y & 0x0f;
@ -656,6 +663,8 @@ void drawScreen() {
} }
setAllPlanes(); setAllPlanes();
setDisplayOffset(scrollOffset); setDisplayOffset(scrollOffset);
setHorizontalPan(screen.scrollX & 0x07);
screen.currentPage ^= 1; screen.currentPage ^= 1;
screen.firstBuffer = screen.nextBuffer; screen.firstBuffer = screen.nextBuffer;
for (di = 0; di < PAGE_TILES_COUNT; di ++) { for (di = 0; di < PAGE_TILES_COUNT; di ++) {
@ -720,25 +729,22 @@ void game_init() {
} }
int main() { int main() {
int x = 100; int x = -1;
int y = 100; int y = -1;
int z = 0; int dir = 0;
game_init(); game_init();
kbd_init(); kbd_init();
while (!keyPressed(K_ESC)) { while (!keyPressed(K_ESC)) {
if (keyPressed(K_LEFT)) x -= 3; if (keyPressed(K_LEFT)) { x -= 3; dir = 2; }
if (keyPressed(K_RIGHT)) x += 3; if (keyPressed(K_RIGHT)) { x += 3; dir = 0; }
if (keyPressed(K_UP)) y -= 3; if (keyPressed(K_UP)) { y -= 3; dir = 1; }
if (keyPressed(K_DOWN)) y += 3; if (keyPressed(K_DOWN)) { y += 3; dir = 3; }
scroll(x - 152, y - 90); scroll(x - 152, y - 90);
drawSprite(&sprites[0 * SPRITE_STRIDE], 50, 50); drawSprite(&sprites[dir * SPRITE_STRIDE], x, y);
drawSprite(&sprites[1 * SPRITE_STRIDE], x, y);
drawScreen(); drawScreen();
z++;
} }
return 0; return 0;

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testbed.exe
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