146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
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#include "williams.h"
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// bias sprites by +4 pixels
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#define XBIAS 2
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// x1: 0-151
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// y1: 0-255
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void blit_solid(byte x1, byte y1, byte w, byte h, byte color) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.dstart = ((word)x1<<8)+y1; // swapped
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blitter.solid = color;
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blitter.flags = DSTSCREEN|SOLID;
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}
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void blit_copy(byte x1, byte y1, byte w, byte h, const byte* data) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.sstart = (word)data;
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blitter.dstart = ((word)x1<<8)+y1; // swapped
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blitter.solid = 0;
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blitter.flags = DSTSCREEN|FGONLY;
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}
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void blit_copy_solid(byte x1, byte y1, byte w, byte h, const byte* data, byte solid) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.sstart = (word)data;
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blitter.dstart = ((word)x1<<8)+y1; // swapped
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blitter.solid = solid;
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if (solid)
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blitter.flags = DSTSCREEN|FGONLY|SOLID;
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else
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blitter.flags = DSTSCREEN;
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}
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void blit_sprite(const byte* data, byte x, byte y) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.sstart = (word)(data+2);
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blitter.dstart = ((word)(x+XBIAS)<<8)+y; // swapped
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blitter.solid = 0;
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blitter.flags = DSTSCREEN|FGONLY;
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}
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void blit_sprite_solid(const byte* data, byte x, byte y, byte color) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.sstart = (word)(data+2);
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blitter.dstart = ((word)(x+XBIAS)<<8)+y; // swapped
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blitter.solid = color;
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blitter.flags = DSTSCREEN|FGONLY|SOLID;
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}
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void unblit_sprite_rect(const byte* data, byte x, byte y) {
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blitter.width = data[0]^4;
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blitter.height = data[1]^4;
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blitter.dstart = ((word)(x+XBIAS)<<8)+y; // swapped
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blitter.solid = 0;
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blitter.flags = DSTSCREEN|SOLID;
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}
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void blit_sprite_strided(const byte* data, byte x, byte y, byte stride) {
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const byte* src = data+2;
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byte height = data[1]^4;
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byte width = data[0]^4;
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while (height--) {
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blit_copy(x, y, width, 1, src);
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y += stride;
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src += width;
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}
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}
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void unblit_sprite_strided(const byte* data, byte x, byte y, byte stride) {
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byte height = data[1]^4;
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byte width = data[0]^4;
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while (height--) {
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blit_solid(x, y, width, 1, 0);
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y += stride;
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}
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}
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void blit_vline(word x1, byte y1, byte h, byte color) {
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blitter.width = 1^4;
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blitter.height = h^4;
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blitter.dstart = ((word)x1<<8)+y1; // swapped
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blitter.solid = color;
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blitter.flags = (x1&1) ? DSTSCREEN|SOLID|ODDONLY : DSTSCREEN|SOLID|EVENONLY;
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}
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// x: 0-303
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void draw_solid(word xx, byte y, byte w, byte h, byte color) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.dstart = ((xx<<7)&0xff00)+y; // swapped
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blitter.solid = color;
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blitter.flags = (xx&1) ? DSTSCREEN|SOLID|RSHIFT : DSTSCREEN|SOLID;
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}
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void draw_vline(word xx, byte y, byte h, byte color) {
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blitter.width = 1^4;
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blitter.height = h^4;
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blitter.dstart = ((xx<<7)&0xff00)+y; // swapped
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blitter.solid = color;
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blitter.flags = (xx&1) ? DSTSCREEN|SOLID|ODDONLY : DSTSCREEN|SOLID|EVENONLY;
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}
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void draw_copy_solid(word xx, byte y, byte w, byte h, const byte* data, byte solid) {
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blitter.width = w^4;
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blitter.height = h^4;
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blitter.solid = solid;
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blitter.sstart = data;
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blitter.dstart = ((xx<<7)&0xff00)+y; // swapped
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if (solid)
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blitter.flags = (xx&1) ? DSTSCREEN|FGONLY|SOLID|RSHIFT : DSTSCREEN|FGONLY|SOLID;
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else
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blitter.flags = (xx&1) ? DSTSCREEN|RSHIFT : DSTSCREEN;
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}
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void draw_pixel(word xx, byte y, byte color) {
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blitter.width = 1^4;
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blitter.height = 1^4;
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blitter.dstart = (((xx>>1)&0xff)<<8)+y; // swapped
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blitter.solid = color;
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blitter.flags = (xx&1) ? SOLID|ODDONLY : SOLID|EVENONLY;
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}
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// BCD
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asm word bcd_add(word a, word b) {
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asm {
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lda 3,s
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adda 5,s
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daa
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exg b,a
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lda 2,s
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adca 4,s
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daa
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}
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}
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