76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
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#include "williams.h"
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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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blitter.flags = DSTSCREEN|FGONLY|SOLID;
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}
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void draw_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<<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_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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void draw_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<<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 erase_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<<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 draw_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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