start on image converter

.rubocop.yml

@@ -0,0 +1,2 @@
+AllCops:
+  TargetRubyVersion: 3.2

image_converter.rb

@@ -0,0 +1,90 @@
+#!/usr/bin/env ruby
+
+require 'rmagick'
+
+# [ ] load the image
+# [ ] map each pixel to a 12 bit color, with pixels less than 25% transparent as mask
+# [ ] sort the color counts
+# [ ] transparent pixels become the mask
+# [ ] turn the big color counts into three bitplames worth of data
+# [ ] turn the little color counts into up to 8 sprites worth of data strips & color changes
+
+image = Magick::Image.read('topaz.png').first
+
+rows = []
+
+class MaskPixel
+  def initialize; end
+
+  def color? = false
+end
+
+class Color
+  attr_reader :red, :green, :blue
+
+  def initialize(red:, green:, blue:)
+    @red = red
+    @green = green
+    @blue = blue
+  end
+
+  def ==(other)
+    red == other.red && green == other.green && blue == other.blue
+  end
+
+  alias eql? ==
+
+  def hash
+    red * 256 + green * 16 + blue
+  end
+end
+
+class BitplanePixel
+  attr_reader :color
+
+  def initialize(color:)
+    @color = color
+  end
+
+  def color? = true
+end
+
+MAX_ALPHA = Magick::QuantumRange * 0.25
+BIT_SHIFT = Math.log2(Magick::QuantumRange + 1) - 4
+
+class PixelRow
+  def initialize
+    @row = []
+  end
+
+  def add(pixel:, x:)
+    @row[x] = pixel
+  end
+
+  def colors_with_usage
+    @row.find_all(&:color?).each_with_object({}) do |pixel, obj|
+      obj[pixel.color] ||= 0
+      obj[pixel.color] += 1
+    end
+  end
+end
+
+image.each_pixel do |px, x, y|
+  rows[y] ||= PixelRow.new
+
+  pixel = if px.alpha < MAX_ALPHA
+            MaskPixel.new
+          else
+            BitplanePixel.new(
+              color: Color.new(
+                red: px.red >> BIT_SHIFT,
+                green: px.green >> BIT_SHIFT,
+                blue: px.blue >> BIT_SHIFT
+              )
+            )
+          end
+
+  rows[y].add(pixel:, x:)
+end
+
+pp rows[50].colors_with_usage

main.c

@@ -39,6 +39,7 @@ uint16_t custom_sprite = (uint16_t)offsetof(Custom, sprpt);
 uint16_t custom_sprite_control = (uint16_t)offsetof(Custom, spr);
 
 uint16_t chip spriteData[200];
+uint16_t chip spriteData2[20];
 
 uint16_t spritePositionsEachLine[256][2];
 
@@ -75,7 +76,7 @@ int main(void) {
   printf("setting up, i haven't crashed...yet.\n");
 
   x = 150;
-  y = 100;
+  y = 47;
   height = y + 98;
 
   printf("%d, %d, %d\n", x, y, height);
@@ -85,13 +86,33 @@ int main(void) {
 
   printf("%0x %0x\n", spriteData[0], spriteData[1]);
 
-  for (i = 2; i < 198; ++i) {
+  for (i = 2; i < 198; i += 2) {
-    spriteData[i] = 0xffff;
+    spriteData[i] = 0x0f + i % 16;
+    spriteData[i + 1] = 0xf0f0;
   }
 
   spriteData[198] = 0x0000;
   spriteData[199] = 0x0000;
 
+  spriteData2[0] = SPRPOS(220, 70);
+  spriteData2[1] = SPRCTL(220, 70, 72);
+  /*
+  spriteData2[2] = 0x0345;
+  spriteData2[3] = 0x5678;
+  spriteData2[4] = 0x9abc;
+  spriteData2[5] = 0xdef0;
+  */
+  spriteData2[2] = 0xffff;
+  spriteData2[3] = 0xffff;
+  spriteData2[4] = 0xffff;
+  spriteData2[5] = 0xffff;
+  spriteData2[6] = SPRPOS(230, 150);
+  spriteData2[7] = SPRCTL(230, 150, 151);
+  spriteData2[8] = 0xffff;
+  spriteData2[9] = 0xffff;
+  spriteData2[10] = 0;
+  spriteData2[11] = 0;
+
   setupScreen(&screenSetup, SCREEN_WIDTH, SCREEN_HEIGHT, 3);
   setupInitialCurrentScreen(&screenSetup, &currentScreen);
 
@@ -138,19 +159,46 @@ int main(void) {
   *(currentCopperlist++) = 0x00F;
 
   *(currentCopperlist++) = custom_sprite;
-  *(currentCopperlist++) = ((uint32_t)&spriteData >> 16);
+  *(currentCopperlist++) = ((uint32_t)&spriteData2 >> 16);
 
   *(currentCopperlist++) = custom_sprite + 2;
-  *(currentCopperlist++) = ((uint32_t)&spriteData & 0xffff);
+  *(currentCopperlist++) = ((uint32_t)&spriteData2 & 0xffff);
 
   for (y = 0; y < 256; ++y) {
-    if (y > 100) {
+    /*
+    if (y > 100 && y < 135) {
       *(currentCopperlist++) = custom_sprite_control;
       *(currentCopperlist++) = SPRPOS(60 + y, y);
 
       *(currentCopperlist++) = custom_sprite_control + 2;
       *(currentCopperlist++) = SPRCTL(60 + y, y, 0);
     }
+    */
+    
+    *(currentCopperlist++) = 1 + (1 << 1) + ((44 + y) << 8);
+    *(currentCopperlist++) = 0xFFFE;
+
+    if (y == 27) {
+      /*
+      *(currentCopperlist++) = custom_sprite_control;
+      *(currentCopperlist++) = 0;
+
+      *(currentCopperlist++) = custom_sprite_control + 2;
+      *(currentCopperlist++) = 0;
+      */
+
+      *(currentCopperlist++) = custom_sprite;
+      *(currentCopperlist++) = ((uint32_t)&spriteData >> 16);
+
+      *(currentCopperlist++) = custom_sprite + 2;
+      *(currentCopperlist++) = ((uint32_t)&spriteData & 0xffff);
+
+      *(currentCopperlist++) = custom_sprite_control;
+      *(currentCopperlist++) = SPRPOS(60, 100);
+
+      *(currentCopperlist++) = custom_sprite_control + 2;
+      *(currentCopperlist++) = SPRCTL(60, 100, 198);
+    }
 
     *(currentCopperlist++) = 1 + (31 << 1) + ((44 + y) << 8);
     *(currentCopperlist++) = 0xFFFE;
@@ -161,6 +209,7 @@ int main(void) {
     *(currentCopperlist++) = 0xFFFE;
     *(currentCopperlist++) = custom_color;
     *(currentCopperlist++) = 0x000;
+
   }
 
   endCopperlist(currentCopperlist);