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https://gitlab.com/camelot/kickc.git
synced 2024-11-20 02:32:36 +00:00
Removed some tests.
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jespergravgaard
parent
a473e963d6
commit
f7617fe06b
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GIMP Palette
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Name: C64 Palette
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Columns: 0
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# https://www.c64-wiki.com/wiki/Color
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0 0 0 Untitled
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255 255 255 Untitled
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136 0 0 Untitled
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170 255 238 Untitled
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204 68 204 Untitled
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0 204 85 Untitled
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0 0 170 Untitled
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238 238 119 Untitled
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221 136 85 Untitled
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102 68 0 Untitled
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255 119 119 Untitled
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51 51 51 Untitled
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119 119 119 Untitled
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170 255 102 Untitled
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0 136 255 Untitled
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187 187 187 Untitled
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Binary file not shown.
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Before Width: | Height: | Size: 1.7 KiB |
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Before Width: | Height: | Size: 2.1 KiB |
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@ -1,203 +0,0 @@
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// A full-screen x/y-scroller
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// World space is a 16-bit signed coordinate system [-32768, 32767] x [-32768, 32767]
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#include <c64.h>
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#include <string.h>
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// Display screen #0 (double buffered)
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char * const MAIN_SCREEN0 = 0x3800;
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// Display screen #1 (double buffered)
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char * const MAIN_SCREEN1 = 0x3c00;
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// Display charset
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char * const MAIN_CHARSET = 0x1000;
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// The render 8x8 buffer containing chars to be rendered onto the screen
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char RENDER_BUFFER[8*8] =
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" ** "
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" ****** "
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" ****** "
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"********"
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"********"
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" ****** "
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" ****** "
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" ** "z;
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// The number of sine values in the table
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const unsigned int SINSIZE = 2048;
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// Sine table [-399,399]
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signed int SINTAB[SINSIZE] = kickasm(uses SINSIZE) {{
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.fillword SINSIZE, 399*sin(i*2*PI/SINSIZE)
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}};
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// 140x125 PETSCII art
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export __address(0x4000) char PETSCII_ART[140*125] = kickasm(resource "cml.png") {{
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.var petsciiPic = LoadPicture("cml.png")
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.print "width: "+petsciiPic.width + " height: "+petsciiPic.height
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.for (var y=0; y<petsciiPic.height; y++)
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.for (var x=0; x<petsciiPic.width; x++)
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.byte petsciiPic.getPixel(x,y)==0?' ':$a0;
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}};
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// Current index into the sine
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unsigned int x_sin_idx = 0;
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unsigned int y_sin_idx = SINSIZE/4;
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// Current x/y-position (the center of the screen)
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signed int x_pos;
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signed int y_pos;
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// The current scroll fine values [0-7] (converted to unsigned)
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unsigned char x_pos_fine;
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unsigned char y_pos_fine;
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// The current scroll coarse values (converted to unsigned)
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unsigned int x_pos_coarse;
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unsigned int y_pos_coarse;
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// The current screen displayed (0/1)
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char screen_buffer = 0;
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void main() {
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// Stop the kernel IRQ
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sei();
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// Clear screen
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memset(MAIN_SCREEN0, ' ', 1000);
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// Display initial screen
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VICII->MEMORY = toD018(MAIN_SCREEN0, MAIN_CHARSET);
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// Find initial position
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next_position();
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for(;;) {
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//VICII->BORDER_COLOR = RED;
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// The old coarse values x/y-positions
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unsigned int x_pos_coarse_old = x_pos_coarse;
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unsigned int y_pos_coarse_old = y_pos_coarse;
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// Update the position
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next_position();
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// Detect the need for coarse scrolling (moving chars on the entire screen) and the direction of the scroll
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// Movement is the offset that the screen data should be moved (-40: down, 40: up, -1: right, 1: left, 0: none)
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signed char y_movement = (signed char)(y_pos_coarse_old-y_pos_coarse); // will be -1/0/1
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signed char movement = 0;
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if(y_movement==1) {
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movement = -40;
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} else if(y_movement==-1) {
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movement = 40;
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}
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signed char x_movement = (signed char)(x_pos_coarse_old-x_pos_coarse); // will be -1/0/1
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movement -= x_movement;
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// If coarse scrolling is needed execute it
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if(movement) {
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// Move chars from active screen to hidden screen - while applying any needed movement
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char * screen_active = (screen_buffer?MAIN_SCREEN1:MAIN_SCREEN0) + movement;
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char * screen_hidden = screen_buffer?MAIN_SCREEN0:MAIN_SCREEN1;
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screencpy(screen_hidden, screen_active);
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// Update any new row if needed
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char* petscii;
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char* scrn;
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if(y_movement) {
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if(y_movement==-1) {
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// Update Bottom row
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petscii = petscii_ptr(x_pos_coarse-20, y_pos_coarse+12);
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scrn = screen_hidden+24*40;
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} else { // y_movement==1
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// Update Top row
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petscii = petscii_ptr(x_pos_coarse-20, y_pos_coarse-12);
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scrn = screen_hidden;
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}
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for(char i=0;i<40;i++)
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scrn[i] = petscii[i];
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}
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// Update any new column if needed
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if(x_movement) {
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if(x_movement==-1) {
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// Update Right column
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petscii = petscii_ptr(x_pos_coarse+19, y_pos_coarse-12);
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scrn = screen_hidden+39;
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} else { // x_movement==1
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// Update Left column
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petscii = petscii_ptr(x_pos_coarse-20, y_pos_coarse-12);
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scrn = screen_hidden;
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}
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for(char i=0;i<25;i++) {
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*scrn = *petscii;
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scrn += 40;
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petscii += 140;
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}
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}
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// Change current screen
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screen_buffer ^=1;
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}
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//VICII->BORDER_COLOR = BLACK;
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// Update the display - wait for the raster
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while(VICII->RASTER!=0xfe) ;
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while(VICII->RASTER!=0xff) ;
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VICII->BORDER_COLOR = WHITE;
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// Y-scroll fine
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VICII->CONTROL1 = VICII->CONTROL1 & 0xf0 | (7-y_pos_fine);
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// X-scroll fine
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VICII->CONTROL2 = VICII->CONTROL2 & 0xf0 | (7-x_pos_fine);
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// Display current screen
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if(screen_buffer) {
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VICII->MEMORY = toD018(MAIN_SCREEN1, MAIN_CHARSET);
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} else {
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VICII->MEMORY = toD018(MAIN_SCREEN0, MAIN_CHARSET);
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}
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VICII->BORDER_COLOR = BLACK;
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}
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}
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// Get a pointer to a specific x,y-position in the PETSCII art
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char* petscii_ptr(unsigned int row_x, unsigned int row_y) {
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return PETSCII_ART + row_y * 140 + row_x;
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}
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// Copy an entire screen (40x25 = 1000 chars)
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// - dst - destination
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// - src - source
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void screencpy( char* dst, char* src) {
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char* src_250 = src+250;
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char* dst_250 = dst+250;
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char* src_500 = src+500;
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char* dst_500 = dst+500;
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char* src_750 = src+750;
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char* dst_750 = dst+750;
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for( char i=0;i<250;i++) {
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dst[i] = src[i];
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dst_250[i] = src_250[i];
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dst_500[i] = src_500[i];
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dst_750[i] = src_750[i];
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}
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}
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inline void sei() {
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asm { sei }
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}
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inline void breakpoint() {
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kickasm {{ .break }}
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}
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// Update the x_pos, y_pos variables to reflect the next position on the curve
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// The position represents the center of the screen
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void next_position() {
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// Move forward along the curve
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x_sin_idx++; if(x_sin_idx>=SINSIZE) x_sin_idx-=SINSIZE;
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y_sin_idx++; if(y_sin_idx>=SINSIZE) y_sin_idx-=SINSIZE;
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// Find the next point
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x_pos = SINTAB[x_sin_idx];
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y_pos = SINTAB[y_sin_idx];
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// Find the unsigned fine/coarse scroll values
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unsigned int x_pos_u = (unsigned int)x_pos + 400 + 20*8;
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x_pos_fine = (unsigned char)x_pos_u & 7;
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x_pos_coarse = x_pos_u/8;
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unsigned int y_pos_u = (unsigned int)y_pos + 400 + 12*8;
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y_pos_fine = (unsigned char)y_pos_u & 7;
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y_pos_coarse = y_pos_u/8;
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}
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