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second: add yet more comments

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This commit is contained in:
Vince Weaver 2023-10-04 14:22:43 -04:00
parent 7555b4d4f9
commit 089ed1c103
1 changed files with 25 additions and 4 deletions
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29
demos/second/part18_3d/auto/box_convert.c
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@ -5,6 +5,8 @@
/* For input assumes a 40x48 (or 80x48, double wide) PNG file */
/* with the Apple II palette */
/* Output is ca65 6502 assembler for including in project */
#include <stdio.h>
#include <stdlib.h>
@ -431,6 +433,10 @@ static int compare_color(const void *p1, const void *p2) {
/* generate data for a frame */
/* returns how many bytes it takes up */
/* we call this many times when iterating to see best color combo */
/* only set print_results on final run to output the data */
int generate_frame(int print_results) {
@ -449,7 +455,10 @@ int generate_frame(int print_results) {
max_primitive=create_using_boxes();
/* Optimize boxes to PLOT/VLIN/HLIN*/
/* Optimize boxes to PLOT/VLIN/HLIN */
/* if 1x1, single pixel plot */
/* if xwidth = 1, then vertical line */
/* if ywidth = 1, then horizontal line */
for(i=0;i<max_primitive;i++) {
if (primitive_list[i].type==ACTION_BOX) {
if ((primitive_list[i].x1==primitive_list[i].x2) &&
@ -466,6 +475,12 @@ int generate_frame(int print_results) {
}
/* Sort each color by BOX/HLIN/ETC */
/* This lets us use more compact encoding where consecutive */
/* types don't have to specify (since we max out at 40x48 we */
/* can use the high bit of the first co-ord to specify whether */
/* we are a number or else starting a new type */
int old_color,last_color_start=0;
old_color=primitive_list[0].color;
@ -481,6 +496,10 @@ int generate_frame(int print_results) {
}
/* Sort HLIN by Y1 */
/* This lets us use more compact encoding where consecutive */
/* horizontal lines don't specify the Y value but just increment */
/* the previous one */
int first_hlin=0,last_hlin=0,j,hlin_found;
old_color=primitive_list[0].color;
@ -515,6 +534,7 @@ int generate_frame(int print_results) {
}
/* Sort BOX by Y1 */
/* This lets us do optimizations similar to HLIN above */
int first_box=0,last_box=0,box_found;
old_color=primitive_list[0].color;
@ -550,6 +570,10 @@ int generate_frame(int print_results) {
/* Optimize HLIN */
/* If Y is same as prev+1, then ACTION_HLIN_ADD */
/* If Y is same as prev+1 and x1 (left) same, then ACTION_HLIN_ADD_LSAME */
/* If Y is same as prev+1 and x2 (right) same, then ACTION_HLIN_ADD_RSAME */
int previous_entry=0,previous_y1=0,previous_x1=0,previous_x2=0,previous_y2=0;
for(i=0;i<max_primitive;i++) {
if (primitive_list[i].type==ACTION_HLIN) {
@ -902,6 +926,3 @@ int main(int argc, char **argv) {
return 0;
}