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Fixed slope calculation. Added fragment.

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This commit is contained in:
jespergravgaard 2021-04-03 00:20:47 +02:00
parent a750c606c9
commit 1c9fa962d3
2 changed files with 20 additions and 6 deletions
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12
src/main/fragment/mos6502-common/vdum1=vwum2_plus_vwum3.asm Normal file
View File

@ -0,0 +1,12 @@
clc
lda {m2}
adc {m3}
sta {m1}
lda {m2}+1
adc {m3}+1
sta {m1}+1
lda #0
sta {m1}+3
adc #0
sta {m1}+2

14
src/test/kc/examples/mega65/linedrawing.c
View File

@ -90,13 +90,16 @@ void main() {
graphics_mode();
draw_line(0, 100, 319, 0, 1);
//draw_line(150, 0, 160, 40, 5);
//draw_line(160, 0, 160, 40, 6);
//draw_line(170, 0, 160, 40, 7);
/*
draw_line(160, 100, 0, 199, 1);
draw_line(160, 100, 319, 199, 2);
draw_line( 0, 0, 160, 100, 3);
draw_line(160, 100, 319, 0, 4);
*/
for(int x1=0;x1<320;x1+=10) {
draw_line(x1, 0, 160, 199, 5);
@ -107,7 +110,6 @@ void main() {
draw_line(0, y1, 319, 100, 6);
draw_line(0, 100, 319, y1, 6);
}
*/
for(;;) ;
@ -207,12 +209,12 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Put slope init into DMA options
unsigned int slope_init = slope/2;
unsigned int slope_init = 32768;
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET] = LOBYTE(slope_init);
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET + 2] = HIBYTE(slope_init);
// Load DMA dest address with the address of the first pixel
unsigned long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (x1&7);
unsigned long addr = GRAPHICS + (unsigned int)(x1/8) * 64 * 25 + (unsigned int)(y1*8) + (unsigned char)(x1&7);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = BYTE0(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = BYTE1(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = BYTE2(addr);
@ -266,12 +268,12 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Put slope init into DMA options
unsigned int slope_init = slope/2;
unsigned int slope_init = 32768;
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET] = LOBYTE(slope_init);
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET + 2] = HIBYTE(slope_init);
// Load DMA dest address with the address of the first pixel
unsigned long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (x1&7);
unsigned long addr = GRAPHICS + (unsigned int)(x1/8) * 64 * 25 + (unsigned int)(y1*8) + (unsigned char)(x1&7);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = BYTE0(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = BYTE1(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = BYTE2(addr);