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Optimized line buffer and rendering sequence slightly

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This commit is contained in:
jespergravgaard 2020-05-08 09:07:46 +02:00
parent 6da9a8f9f8
commit aa66273149
1 changed files with 17 additions and 19 deletions
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28
src/test/kc/complex/polygon/polygon.c
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@ -14,7 +14,7 @@
#undef DEBUG #undef DEBUG
// The line buffer // The line buffer
char* const LINE_BUFFER = 0x4000; char* const LINE_BUFFER = 0x2000;
// The two charsets used as screen buffers // The two charsets used as screen buffers
char* const CANVAS1 = 0x3000; char* const CANVAS1 = 0x3000;
char* const CANVAS2 = 0x3800; char* const CANVAS2 = 0x3800;
@ -38,8 +38,6 @@ char align(0x100) SINTAB[0x140] = kickasm {{
}}; }};
char* COSTAB = SINTAB+0x40; char* COSTAB = SINTAB+0x40;
void plot(char* canvas, char x, char y);
void main() { void main() {
// Clear the console // Clear the console
memset(CONSOLE, ' ', 40*25); memset(CONSOLE, ' ', 40*25);
@ -66,7 +64,7 @@ void main() {
// Set text color // Set text color
textcolor(WHITE); textcolor(WHITE);
char p0_idx = 0x88; char p0_idx = 0xf0;
char p1_idx = p0_idx+15; char p1_idx = p0_idx+15;
char p2_idx = p0_idx+170; char p2_idx = p0_idx+170;
@ -91,16 +89,16 @@ void main() {
p0_idx++; p0_idx++;
p1_idx++; p1_idx++;
p2_idx++; p2_idx++;
// Fill canvas
eorfill(LINE_BUFFER, canvas);
// Wait until the canvas on screen has been switched before starting work on the next frame // Wait until the canvas on screen has been switched before starting work on the next frame
VICII->BORDER_COLOR = RED; VICII->BORDER_COLOR = RED;
while(canvas_show_flag) {} while(canvas_show_flag) {}
VICII->BORDER_COLOR = BLACK; VICII->BORDER_COLOR = BLACK;
// Swap canvas to show on screen (using XOR) // Fill canvas
canvas_show_memory ^= toD018(SCREEN,CANVAS1)^toD018(SCREEN,CANVAS2); eorfill(LINE_BUFFER, canvas);
// swap canvas being rendered to (using XOR) // swap canvas being rendered to (using XOR)
canvas ^= (CANVAS1^CANVAS2); canvas ^= (CANVAS1^CANVAS2);
// Swap canvas to show on screen (using XOR)
canvas_show_memory ^= toD018(SCREEN,CANVAS1)^toD018(SCREEN,CANVAS2);
// Set flag used to signal when the canvas has been shown // Set flag used to signal when the canvas has been shown
canvas_show_flag = 1; canvas_show_flag = 1;
// Read and display cycles // Read and display cycles
@ -175,7 +173,7 @@ void line(char* canvas, char x1, char y1, char x2, char y2) {
// X is the driver - plot every X using bresenham // X is the driver - plot every X using bresenham
char e = dx/2; char e = dx/2;
do { do {
plot(canvas, x, y); plot(x, y);
x += sx; x += sx;
e += dy; e += dy;
if(dx < e) { if(dx < e) {
@ -183,32 +181,32 @@ void line(char* canvas, char x1, char y1, char x2, char y2) {
e -= dx; e -= dx;
} }
} while (x != x2); } while (x != x2);
plot(canvas, x, y); plot(x, y);
} else { } else {
// Y is the driver - only plot one plot per X // Y is the driver - only plot one plot per X
char e = dy/2; char e = dy/2;
plot(canvas, x, y); plot(x, y);
do { do {
y += sy; y += sy;
e += dx; e += dx;
if(dy<e) { if(dy<e) {
x += sx; x += sx;
e -= dy; e -= dy;
plot(canvas, x, y); plot(x, y);
} }
} while (y != y2); } while (y != y2);
} }
} }
// Column offsets // Column offsets
unsigned int plot_column[16] = { 0, 1*128, 2*128, 3*128, 4*128, 5*128, 6*128, 7*128, 8*128, 9*128, 10*128, 11*128, 12*128, 13*128, 14*128, 15*128 }; char* plot_column[16] = { LINE_BUFFER+0, LINE_BUFFER+1*128, LINE_BUFFER+2*128, LINE_BUFFER+3*128, LINE_BUFFER+4*128, LINE_BUFFER+5*128, LINE_BUFFER+6*128, LINE_BUFFER+7*128, LINE_BUFFER+8*128, LINE_BUFFER+9*128, LINE_BUFFER+10*128, LINE_BUFFER+11*128, LINE_BUFFER+12*128, LINE_BUFFER+13*128, LINE_BUFFER+14*128, LINE_BUFFER+15*128 };
// The bits used for plotting a pixel // The bits used for plotting a pixel
char plot_bit[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01}; char plot_bit[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01};
// Plot a single point on the canvas // Plot a single point on the canvas
void plot(char* canvas, char x, char y) { inline void plot(char x, char y) {
// Find the canvas column // Find the canvas column
char* column = canvas + plot_column[x/8]; char* column = plot_column[x/8];
// Plot the bit // Plot the bit
column[y] |= plot_bit[x&7]; column[y] |= plot_bit[x&7];
} }