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Optimized readability.

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This commit is contained in:
jespergravgaard 2021-04-02 10:51:20 +02:00
parent fa53ba3dce
commit 663f134b0f
1 changed files with 10 additions and 10 deletions
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20
src/test/kc/examples/mega65/linedrawing.c
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@ -97,7 +97,7 @@ void main() {
// Address of the screen
unsigned char * const SCREEN = 0xc000;
// // Absolute address of the graphics
const long GRAPHICS = 0x40000;
const unsigned long GRAPHICS = 0x40000;
void graphics_mode(void) {
// 16-bit text mode, full-colour text for high chars
@ -143,13 +143,13 @@ void graphics_mode(void) {
}
void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
void draw_line(unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, unsigned char colour) {
// Ignore if we choose to draw a point
if (x2 == x1 && y2 == y1)
return;
int dx = x2 - x1;
int dy = y2 - y1;
int dx = (int)x2 - (int)x1;
int dy = (int)y2 - (int)y1;
if (dx < 0)
dx = -dx;
if (dy < 0)
@ -160,7 +160,7 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
// Y is major axis
if (y2 < y1) {
int temp = x1;
unsigned int temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
@ -182,14 +182,14 @@ 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
int slope = *MATH_DIVOUT_FRAC_INT1;
unsigned int slope = (unsigned int )*MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Load DMA dest address with the address of the first pixel
long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (x1&7);
unsigned long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (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);
@ -215,7 +215,7 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
// X is major axis
if (x2 < x1) {
int temp = x1;
unsigned int temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
@ -236,14 +236,14 @@ 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
int slope = *MATH_DIVOUT_FRAC_INT1;
unsigned int slope = (unsigned int)*MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Load DMA dest address with the address of the first pixel
long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (x1&7);
unsigned long addr = GRAPHICS + (x1/8) * 64 * 25 + (y1*8) + (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);