Add font loader

MODULE.bazel

@@ -1,6 +1,24 @@
-###############################################################################
-# Bazel now uses Bzlmod by default to manage external dependencies.
-# Please consider migrating your external dependencies from WORKSPACE to MODULE.bazel.
-#
-# For more details, please check https://github.com/bazelbuild/bazel/issues/18958
-###############################################################################
+"""
+CrocParty: a tiny platformer.
+"""
+module(
+    name="crocparty",
+    version="0.0",
+)
+
+bazel_dep(name="rules_python", version="0.31.0")
+
+# Set up Python
+python = use_extension("@rules_python//python/extensions:python.bzl", "python")
+python.toolchain(
+    python_version = "3.10",
+    is_default = True,
+)
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "pytools_deps",
+    python_version = "3.10",
+    requirements_lock = "//pytools:requirements.txt",
+)
+use_repo(pip, "pytools_deps")

device/device.h

@@ -4,9 +4,9 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-// 240 x 135 is also cool
-#define DEVICE_W 128
-#define DEVICE_H 128
+// 256 x 144 is also cool
+#define DEVICE_W 256
+#define DEVICE_H 144
 
 typedef enum {
     DEVICE_BUTTON_L=0,

game/game.c

@@ -49,10 +49,10 @@ void game_update() {
     ellipse_x0 += ellipse_dx0;
     if (ellipse_x0 < 0 || ellipse_x0 > DEVICE_W * 4) { ellipse_dx0 *= -1; }
     ellipse_y0 += ellipse_dy0;
-    if (ellipse_y0 < 0 || ellipse_y0 > DEVICE_W * 4) { ellipse_dy0 *= -1; }
+    if (ellipse_y0 < 0 || ellipse_y0 > DEVICE_H * 4) { ellipse_dy0 *= -1; }
 
     ellipse_x1 += ellipse_dx1;
-    if (ellipse_x1 < 0 || ellipse_x1 > DEVICE_H * 4) { ellipse_dx1 *= -1; }
+    if (ellipse_x1 < 0 || ellipse_x1 > DEVICE_W * 4) { ellipse_dx1 *= -1; }
     ellipse_y1 += ellipse_dy1;
     if (ellipse_y1 < 0 || ellipse_y1 > DEVICE_H * 4) { ellipse_dy1 *= -1; }
 }
@@ -89,4 +89,6 @@ void game_draw() {
     sys_circ_draw_ext(x0, y0, 6, 248, false);
     sys_circ_draw_ext(x0, y0, 8, 244, false);
     sys_line_draw(x0, y0, x1, y1, 254);
+
+    sys_print("Hello, blood\nsources!", x1, y1, 224);
 }

pytools/.gitignore

@@ -0,0 +1 @@
+venv/

pytools/BUILD

@@ -0,0 +1,10 @@
+load("@pytools_deps//:requirements.bzl", "requirement")
+
+py_binary(
+    name = "font",
+    srcs = ["font.py"],
+    deps = [
+        requirement("pillow"),
+    ],
+    visibility = ["//visibility:public"],
+)

pytools/font.py

@@ -0,0 +1,53 @@
+from typing import Tuple
+from PIL import Image
+import sys
+
+
+def main(font_name, n_glyphs, fname_png, fname_c):
+    glyphs = load_glyphs(fname_png)
+    assert(len(glyphs) == n_glyphs), f"must be exactly {n_glyphs} glyphs"
+
+    with open(fname_c, "wt") as output:
+        output.writelines([
+            "// generated code! be nice!\n",
+            "#include \"sys/sys.h\";\n",
+            f"sys_glyph {font_name}[{n_glyphs}] = {{{', '.join(str(g) for g in glyphs)}}};\n"
+        ])
+
+
+def load_glyphs(fname_png: str):
+    with Image.open(fname_png) as im:
+        width = im.width
+        height = im.height
+
+        assert width % 8 == 0, "width must be a multiple of 8"
+        assert height % 8 == 0, "height must be a multiple of 8"
+
+        data = list(im.convert("RGBA").getdata())
+        monochrome = [pixel_to_monochrome(p) for p in data]
+
+        glyphs = []
+        for gy in range(0, height, 8):
+            for gx in range(0, width, 8):
+                glyph = 0
+                for py in range(0, 8):
+                    for px in range(0, 8):
+                        x = gx + px
+                        y = gy + py
+                        if monochrome[y * width + x]:
+                            glyph |= 1 << (py * 8 + px)
+                glyphs.append(glyph)
+
+        return glyphs
+
+
+def pixel_to_monochrome(rgba: Tuple[int, int, int, int]):
+    if rgba[3] < 128: return False
+    if (rgba[0] + rgba[1] + rgba[2])/3 < 128: return False
+    return True
+
+
+if __name__ == "__main__":
+    assert len(sys.argv) == 5, \
+        "there must be four args (font name, n glyphs, src png, out c)"
+    main(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4])

pytools/requirements.txt

@@ -0,0 +1 @@
+pillow==10.2.0

sys/BUILD

@@ -1,7 +1,22 @@
+load("@bazel_skylib//rules:run_binary.bzl", "run_binary")
+
 cc_library(
     name = "sys",
-    srcs = glob(["*.c"]),
-    hdrs = glob(["*.h"]),
+    srcs = glob(["*.c"]) + [":fonts/sys_font_small.c"],
+    hdrs = glob(["*.h"]) + [":fonts/sys_font_small.h"],
     visibility = ["//visibility:public"],
-    deps = ["//device:device"]
+    deps = ["//device:device"],
+)
+
+run_binary(
+    name = "sys_font_small",
+    args = [
+        "sys_font_small",
+        "256",
+        "$(location :fonts/sys_font_small.png)", 
+        "$(location :fonts/sys_font_small.c)"
+    ],
+    srcs = [":fonts/sys_font_small.png"],
+    outs = [":fonts/sys_font_small.c"],
+    tool = "//pytools:font",
 )

sys/fonts/sys_font_small.h

@@ -0,0 +1,8 @@
+#ifndef CROCPARTY_SYS_FONT_SMALL_H
+#define CROCPARTY_SYS_FONT_SMALL_H
+
+#include "sys/sys.h"
+
+extern sys_glyph sys_font_small[256];
+
+#endif  // CROCPARTY_SYS_FONT_SMALL_H

sys/sys.h

@@ -3,6 +3,7 @@
 
 #include "sys_data.h"
 #include "sys_graphics.h"
+#include "fonts/sys_font_small.h"
 
 /**
  * Initialize sys. 

sys/sys_data.h

@@ -6,6 +6,7 @@
 typedef int32_t sys_i32;
 typedef uint8_t sys_color;
 typedef uint32_t sys_screen_color;
+typedef uint64_t sys_glyph;
 
 sys_screen_color sys_make_screen_color(uint8_t r, uint8_t g, uint8_t b);
 

sys/sys_graphics.c

@@ -11,6 +11,7 @@ void sys_pixel_internal_set(sys_i32 x, sys_i32 y, sys_color c);
 void sys_scanline_internal_set(
     sys_i32 x0, sys_i32 x1, sys_i32 y, sys_color c, bool fill
 );
+void sys_glyph_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c);
 
 // == public ==
 void sys_clip_set(sys_i32 x0, sys_i32 y0, sys_i32 x1, sys_i32 y1) {
@@ -55,6 +56,18 @@ sys_color sys_pixel_get(sys_i32 x, sys_i32 y) {
     return device_pixels[y][x];
 }
 
+void sys_print(char* str, sys_i32 x, sys_i32 y, sys_color col) {
+    sys_i32 x_orig = x;
+    for (sys_i32 i = 0;; i++) {
+        uint8_t c = str[i];
+        if (c == 0) { break; }
+        if (c == '\n') { x = x_orig; y += 8; continue; }
+        if (c == '\r') { x = x_orig; continue; }
+        sys_glyph_draw(x, y, sys_font_small[c], col);
+        x += 8;
+    }
+}
+
 void sys_cls(sys_color c) {
     assert(sys_get_initialized());
 
@@ -251,3 +264,16 @@ void sys_scanline_internal_set(
         sys_pixel_internal_set(x1, y, c);
     }
 }
+
+void sys_glyph_draw(sys_i32 x, sys_i32 y, sys_glyph g, sys_color c) {
+    // iterate through the bits of the glyph, and draw the character
+    // if that bit is set
+    for (int py = 0; py < 8; py++) {
+        for (int px = 0; px < 8; px++) {
+            uint64_t mask = ((uint64_t) 1) << (uint64_t) (py * 8 + px);
+            if ((g & mask) != 0) {
+                sys_pixel_internal_set(x + px, y + py, c);
+            }
+        }
+    }
+}

sys/sys_graphics.h

@@ -54,7 +54,10 @@ sys_color sys_pixel_get(
 
 // TODO: SSET/SGET
 // TODO: FGET/FSET
-// TODO: PRINT
+/**
+ * Print a string `str` in the color `col`
+ */
+void sys_print(char* str, sys_i32 x, sys_i32 y, sys_color col);
 // TODO: CURSOR? COLOR?
 
 /**
@@ -83,7 +86,7 @@ void sys_camera_reset();
  * This is a special case of sys_circ_oval_draw_ext.
  */
 void sys_circ_draw(sys_i32 x, sys_i32 y, sys_i32 r, sys_color c);  
-void sys_circ_fill(sys_i32 x, sys_i32 y, sys_i32 r);  
+void sys_circ_fill(sys_i32 x, sys_i32 y, sys_i32 r, sys_color c);  
 void sys_circ_draw_ext(sys_i32 x, sys_i32 y, sys_i32 r, sys_color c, bool fill);
 
 /**