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Added constants

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This commit is contained in:
jespergravgaard 2021-04-01 20:53:46 +02:00
parent 385a5b2eb1
commit e6d28c8ff4
1 changed files with 25 additions and 36 deletions
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61
src/test/kc/examples/mega65/linedrawing.c
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@ -72,24 +72,19 @@ void main() {
VICIV->CONTROLC |= 0x40;
graphics_mode();
draw_line(160, 100, 0, 198, 1);
draw_line(160, 100, 319, 198, 2);
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 = 160;
for(int x2=0;x2<320;x2+=11) {
draw_line(x1, 100, x2, 198, 1);
}
*/
}
// Address of the screen
unsigned char* SCREEN = 0xc000;
// Address of the graphics
unsigned long GRAPHICS = 0x40000;
unsigned char * const SCREEN = 0xc000;
// // Absolute address of the graphics
const long GRAPHICS = 0x40000;
void graphics_mode(void) {
// 16-bit text mode, full-colour text for high chars
@ -103,15 +98,14 @@ void graphics_mode(void) {
// Draw 40 chars per row
VICIV->CHRCOUNT = 40;
// Put 2KB screen at $C000
VICIV->SCRNPTR_LOLO = 0x00;
VICIV->SCRNPTR_LOHI = 0xc0;
VICIV->SCRNPTR_LOLO = <(SCREEN);
VICIV->SCRNPTR_LOHI = >(SCREEN);
VICIV->SCRNPTR_HILO = 0x00;
// Layout screen so that graphics data comes from $40000 -- $4FFFF
// Each column is consequtive values
unsigned int * screen = 0xc000;
unsigned int ch = 0x40000 / 0x40;
unsigned int * screen = (unsigned int *)SCREEN;
unsigned int ch = (unsigned int)(GRAPHICS / 0x40);
for(char y=0;y<25;y++) {
unsigned int ch_x = ch;
for(char x=0;x<40;x++) {
@ -137,17 +131,13 @@ void graphics_mode(void) {
}
void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
{
long addr;
int temp, slope, dx, dy;
void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
// Ignore if we choose to draw a point
if (x2 == x1 && y2 == y1)
return;
dx = x2 - x1;
dy = y2 - y1;
int dx = x2 - x1;
int dy = y2 - y1;
if (dx < 0)
dx = -dx;
if (dy < 0)
@ -158,7 +148,7 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
// Y is major axis
if (y2 < y1) {
temp = x1;
int temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
@ -180,14 +170,14 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
// Slope is the most significant bytes of the fractional part
// of the division result
slope = *MATH_DIVOUT_FRAC_INT1;
int slope = *MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = <(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = >(slope);
// Load DMA dest address with the address of the first pixel
addr = 0x40000 + (y1 << 3) + (x1 & 7) + (x1 >> 3) * 64 * 25l;
long addr = GRAPHICS + (y1 << 3) + (x1 & 7) + (x1 >> 3) * 64 * 25l;
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = <(<(addr));
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = >(<(addr));
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = <(>(addr));
@ -200,10 +190,10 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET + 1] = >(dy);
// Command is FILL
line_dma_command[LINE_DMA_COMMAND_COMMAND_OFFSET] = 0x03;
line_dma_command[LINE_DMA_COMMAND_COMMAND_OFFSET] = DMA_COMMAND_FILL;
// Line mode active, major axis is Y
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = 0x80 + 0x40 + (((x2 - x1) < 0) ? 0x20 : 0x00);
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = DMA_OPTION_LINE_MODE_ENABLE + DMA_OPTION_LINE_MODE_DIRECTION_Y + (((x2 - x1) < 0) ? DMA_OPTION_LINE_MODE_SLOPE_NEGATIVE : 0x00);
VICIV->BORDER_COLOR = 1;
// Set address of DMA list
@ -218,7 +208,7 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
// X is major axis
if (x2 < x1) {
temp = x1;
int temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
@ -239,14 +229,14 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
VICIV->BORDER_COLOR = 0;
// Slope is the most significant bytes of the fractional part of the division result
slope = *MATH_DIVOUT_FRAC_INT1;
int slope = *MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = <(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = >(slope);
// Load DMA dest address with the address of the first pixel
addr = 0x40000 + (y1 << 3) + (x1 & 7) + (x1 >> 3) * 64 * 25;
long addr = GRAPHICS + (y1 << 3) + (x1 & 7) + (x1 >> 3) * 64 * 25;
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = <(<(addr));
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = >(<(addr));
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = <(>(addr));
@ -259,11 +249,10 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour)
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET + 1] = >(dx);
// Command is FILL
line_dma_command[LINE_DMA_COMMAND_COMMAND_OFFSET] = 0x03;
line_dma_command[LINE_DMA_COMMAND_COMMAND_OFFSET] = DMA_COMMAND_FILL;
// Line mode active, major axis is X
char line_mode = (((y2 - y1) < 0) ? 0x20 : 0x00);
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = 0x80 + 0x00 + line_mode;
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = DMA_OPTION_LINE_MODE_ENABLE + (((y2 - y1) < 0) ? DMA_OPTION_LINE_MODE_SLOPE_NEGATIVE : 0x00);
VICIV->BORDER_COLOR = 1;
// Set address of DMA list