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https://github.com/isometimes/rpi4-osdev
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Added wwarp.c and examples/wgt32.c to exercise it
This commit is contained in:
Adam Greenwood-Byrne
parent
c0f33240cb
commit
9b494efa78
4 changed files with 352 additions and 0 deletions
137
part12-wgt/examples/wgt32.c
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137
part12-wgt/examples/wgt32.c
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#include "wgt.h"
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#include "include/mem.h"
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// ######## REQUIRED FUNCTIONS ########
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unsigned long state0 = 1000;
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unsigned long state1 = 2000;
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unsigned long rand(void)
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{
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unsigned long s1 = state0;
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unsigned long s0 = state1;
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state0 = s0;
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s1 ^= s1 << 23;
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s1 ^= s1 >> 17;
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s1 ^= s0;
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s1 ^= s0 >> 26;
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state1 = s1;
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return state0 + state1;
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}
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void wait_msec(unsigned int n)
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{
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register unsigned long f, t, r;
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// Get the current counter frequency
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asm volatile ("mrs %0, cntfrq_el0" : "=r"(f));
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// Read the current counter
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asm volatile ("mrs %0, cntpct_el0" : "=r"(t));
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// Calculate expire value for counter
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t+=((f/1000)*n)/1000;
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do{asm volatile ("mrs %0, cntpct_el0" : "=r"(r));}while(r<t);
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}
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// ######## STUB FUNCTIONS ########
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unsigned int kb = 0;
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unsigned int kbhit(void) {
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kb++;
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return kb / 500;
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}
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void getch(void) {
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wait_msec(0x500000);
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kb = 0;
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}
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// ######## WGT EXAMPLES ########
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void wgt32()
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{
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int i, t, c, b;
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color pal[256];
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block wgt1;
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short top[320];
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short bot[320];
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set_clock_rate(get_max_clock());
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mem_init();
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vga256 (); /* Initialize graphics mode */
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extern unsigned char _binary_bin_wgt1_pal_start[];
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wloadpalette (&_binary_bin_wgt1_pal_start[0], pal);
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wsetpalette (0, 255, pal);
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extern unsigned char _binary_bin_wgt1_blk_start[];
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wgt1 = wloadblock (&_binary_bin_wgt1_blk_start[0]);
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wcls (vgapal[0]); /* Clear screen with black */
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wclip (0, 0, 319, 199); /* Use full screen */
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/* Note: wsline merely stores y coordinates of line in array. You may use
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several calls with various x ranges to make curved lines */
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wsline (0, 199, 319, 0, top); /* Set array top for diagonal line */
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wsline (0, 199, 319, 199, bot); /* Array bot is horizontal line */
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wwarp (0, 319, top, bot, wgt1, 0); /* Warp image between lines */
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getch (); /* Wait for key */
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// squish it
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wcls (vgapal[0]); /* Clear screen */
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wsline (0, 100, 100, 0, top); /* Now create arrow shape */
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wsline (101, 70, 218, 70, top);
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wsline (219, 0, 319, 100, top);
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wsline (0, 100, 100, 199, bot);
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wsline (101, 130, 218, 130, bot);
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wsline (219, 199, 319, 100, bot);
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wwarp (0, 319, top, bot, wgt1, 0); /* Warp image using arrays */
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getch (); /* Wait for keypress */
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// make a double arrow
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wcls (vgapal[0]); /* Clear screen with black */
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do {
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b =rand() % 100;
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c = (rand() % 100) + 100;
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for (t = 0; t <= 319; t++)
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{
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i = rand() % 2;
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if (i == 0)
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b++;
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else b--;
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i = rand() % 2;
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if (i == 0)
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c++;
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else c--;
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if (b > 100)
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b = 100;
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if (b < 0)
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b = 0;
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if (c > 197)
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c = 197;
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if (c < 100)
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c = 100;
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top[t] = b; /* Create random wavy lines */
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bot[t] = c;
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}
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wwarp (0, 319, top, bot, wgt1, 0); /* And warp image between them */
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getch (); /* Wait for keypress */
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wcls (vgapal[0]); /* Clear screen with black */
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} while (1); /* End program if Q pressed */
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wfreeblock (wgt1); /* Free memory from image */
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}
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void main()
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{
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wgt32();
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while (1);
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}
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@ -123,3 +123,6 @@ void wskew (short x, short y, block image, short degrees);
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short wloadsprites (color *pal, unsigned char *file, block *image_array, short start, short end);
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void wfreesprites (block *image_array, short start, short end);
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void wcopyscreen (short x, short y, short x2, short y2, block source, short destx, short desty, block dest);
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void wsline (short x, short y, short x2, short y2, short *y_array);
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void wwarp (short sx, short ex, short *tpy, short *bty, block ptr, short mode);
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void wresize_column (short x, short y, short y2, block image, short column, short mode);
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@ -198,3 +198,130 @@ unsigned long xfrac;
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}
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}
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}
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int resize_width_asm;
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int screen_width_asm;
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void resize_vertical_line (block src, block dest, unsigned int whole, unsigned long xfrac, unsigned short step, int length)
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{
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int resize_width_asm2;
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int screen_width_asm2;
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resize_width_asm2 = resize_width_asm;
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screen_width_asm2 = screen_width_asm;
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unsigned int px;
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vresizeloop:
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px = *src;
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src += whole;
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xfrac += step;
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if (xfrac > 65535) {
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xfrac %= 65536;
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} else {
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goto novres;
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}
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src += resize_width_asm2;
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novres:
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*dest = px;
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dest += screen_width_asm2;
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length--;
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if (length != 0) goto vresizeloop;
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}
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void resize_vertical_line_xray (block src, block dest, unsigned int whole, unsigned long xfrac, unsigned short step, int length)
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{
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int resize_width_asm2;
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int screen_width_asm2;
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resize_width_asm2 = resize_width_asm;
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screen_width_asm2 = screen_width_asm;
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unsigned int px;
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vresizeloop:
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px = *src;
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src += whole;
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xfrac += step;
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if (xfrac > 4294967295) {
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xfrac %= 4294967296;
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goto novres;
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}
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src += resize_width_asm2;
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novres:
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if (px != 0) *dest = px;
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dest += screen_width_asm2;
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length--;
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if (length != 0) goto vresizeloop;
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}
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void wresize_column (short x, short y, short y2, block image, short column, short mode)
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{
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int origheight;
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int finalheight;
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int endheight;
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long ystepper;
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long ywhole;
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short ystep;
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int yfrac;
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long ydif;
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block dest;
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block src;
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/* Skip over the width/height integers */
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origheight = wgetblockheight (image);
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resize_width_asm = wgetblockwidth (image);
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src = image + 2 + column;
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if (y2 < y)
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{
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src += (origheight - 1) * resize_width_asm;
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origheight *= -1;
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ydif = y;
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y = y2;
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y2 = ydif;
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}
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finalheight = (y2 - y) + 1;
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if (finalheight > 0)
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{
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ystepper = (((long)origheight << 16) / (long)finalheight);
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ywhole = ystepper >> 16;
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ystep = ystepper - (ywhole << 16);
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dest = &abuf[y * WGT_SYS.xres + x];
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/* Make an initial pointer to the destination */
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endheight = finalheight;
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/* Differences between actual coordinates and */
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ydif = 0; /* the clipped coordinates. */
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yfrac = 0; /* Reset step to 0 */
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if (y < ty)
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{
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ydif = ty - y;
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endheight = finalheight - ydif;
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dest += ydif * WGT_SYS.xres;
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yfrac = (ydif * ystep) % 65536;
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src += ((ydif * ystepper) >> 16) * resize_width_asm;
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}
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if (y + finalheight > by + 1)
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endheight -= ((y + finalheight) - by);
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/* Clip the bottom edge by decreasing the number of pixels drawn. */
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if (endheight > 0)
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{
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screen_width_asm = WGT_SYS.xres;
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ywhole *= resize_width_asm;
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if (mode == NORMAL)
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resize_vertical_line (src, dest, ywhole, yfrac, ystep, endheight);
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else
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resize_vertical_line_xray (src, dest, ywhole, yfrac, ystep, endheight);
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}
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}
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}
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85
part12-wgt/wwarp.c
Normal file
85
part12-wgt/wwarp.c
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@ -0,0 +1,85 @@
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#include "wgt.h"
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void wsline (short x, short y, short x2, short y2, short *y_array)
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{
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short t, distance;
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short wx, wy, dx, dy, bdx, bdy, incx, incy;
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dx = x2 - x;
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dy = y2 - y;
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t = 0; wx = 0; wy = 0;
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if (dy < 0) incy = - 1;
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else incy = 1;
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if (dx < 0) incx = - 1;
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else incx = 1;
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bdx = abs (dx);
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bdy = abs (dy);
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if (bdx > bdy) distance = bdx;
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else distance = bdy;
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y_array += x;
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if (distance == bdx)
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{
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while (t <= distance)
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{
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if ((x >= tx) && (y >= ty) && (y <= by) && (x <= bx))
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*y_array = y;
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/* instead of plotting pixels, just store the y value in an array */
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wy += bdy;
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x += incx;
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y_array++;
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t ++;
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if (wy >= distance)
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{
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wy -= distance;
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y += incy;
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}
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}
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}
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else
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{
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while (t <= distance)
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{
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if ((x >= tx) && (y >= ty) && (y <= by) && (x <= bx))
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*y_array = y;
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wx += bdx;
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if (wx >= distance)
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{
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wx -= distance;
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x += incx;
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y_array++;
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}
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y += incy;
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t ++;
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}
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}
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}
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void wwarp (short sx, short ex, short *tpy, short *bty, block ptr, short mode)
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{
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long column;
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int wid;
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short finalwidth;
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short origwidth;
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long xstepper;
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origwidth = wgetblockwidth (ptr);
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/* Get the original width of the block */
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finalwidth = abs (ex - sx) + 1;
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/* Find the new width */
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xstepper = ((long)(origwidth) << 16) / ((long)(finalwidth));
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/* Calculate the amount to add to the source bitmap for every pixel across.
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This is done using a fixed point number by multiplying it by 65536 (<<16)
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and using 0-65535 as a fractional amount. */
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column = 0;
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for (wid = sx; wid <= ex; wid++)
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{
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wresize_column (wid, tpy[wid], bty[wid], ptr, column >> 16, mode);
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column += xstepper;
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}
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}
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