Bump engine submodule and move shader loading code to game.

engine

@@ -1 +1 @@
-Subproject commit 1e56cc1c28d4f9977b55f47566c3c8050f25670c
+Subproject commit af25548752d7ae7004a937307e06bd4810e46cc7

game/game.py

@@ -18,7 +18,8 @@ from math import pi, tau, dist
 
 from engine import *
 
-from game import math, resources, camera, batch, triangles, generator, environment, sea
+from game import (
+    math, resources, shader, camera, batch, triangles, generator, environment, sea)
 
 def main():
     print("Generating terrain...")
@@ -29,8 +30,8 @@ def main():
 
     print("Initializing...")
     window = initialize(b'RK Island', 1600, 900)
-    terrain_shader = load_shader(b'game/shaders/terrain')
-    sky_shader = load_shader(b'game/shaders/sky')
+    terrain_shader = shader.load('terrain')
+    sky_shader = shader.load('sky')
 
     print("Loading resources...")
     select_shader(terrain_shader)

game/shader.py

@@ -0,0 +1,44 @@
+# Copyright (C) 2022 RozK
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from pathlib import Path
+
+from engine import load_shader
+
+#TODO: preprocessing (at least includes)
+
+def load(name):
+    def _cleanup(_line):
+        return _line.partition('//')[0].strip()
+    def _filter(_line):
+        return _line
+    def _convert(_line):
+        return bytes(_line, 'utf-8') + b'\n'
+    def load_source(_path):
+        if not _path.exists():
+            print("Cannot find", _path)
+            return None
+        return list(map(_convert, filter(_filter, map(_cleanup, open(_path, 'rt')))))
+    print("Loading shader", name)
+    path = Path('.') / 'game' / 'shaders'
+    vert_lines = load_source(path / (name + '_opengles.vert'))
+    if not vert_lines:
+        print("Error: Vertex shader is empty.")
+        return None
+    frag_lines = load_source(path / (name + '_opengles.frag'))
+    if not frag_lines:
+        print("Error: Fragment shader is empty.")
+        return None
+    return load_shader(vert_lines, frag_lines)