bool addition, few fixes

konabot/plugins/marchtoy/gl_render.py

@@ -14,8 +14,10 @@ with (PATH / "vert.glsl").open(encoding='utf-8') as f:
 
 async def render(command: str, res: tuple[int, int]):
     fs = Scene(command).compile()
-    
-    ctx = moderngl.create_context(standalone=True, backend="egl")
+    try:
+        ctx = moderngl.create_context(standalone=True)
+    except:
+        ctx = moderngl.create_context(standalone=True, backend="egl")
     ctx.gc_mode = "auto"
     try:
         program = ctx.program(

konabot/plugins/marchtoy/obj.py

@@ -244,6 +244,27 @@ class BoolSubstract(Object):
     def sdf_block_glsl(self):
         return f"max({self.block_a}, -{self.block_b})"
 
+class BoolAddition(Object):
+    def __init__(self):
+        super().__init__()
+    
+    def parse_args(self, args: list[str]):
+        from konabot.plugins.marchtoy.scene import Scene
+        try:
+            if not len(args) >= 2:
+                raise Exception("expecting at least 2 args")
+            scene_a = Scene(args[0])
+            scene_b = Scene(args[1])
+            self.block_a = scene_a.canvas_objs[0][1]
+            self.block_b = scene_b.canvas_objs[0][1]
+        except Exception as e:
+            raise Exception(f"cannot build bool object over {args}: {e}")
+        
+    def sdf_block_glsl(self):
+        return f"min({self.block_a}, {self.block_b})"
+
+
+
 @make_obj("camera", "cam")
 class Camera(Object):
     def __init__(self, _focus: float = 2.0) -> None:

konabot/plugins/marchtoy/scene.py

@@ -69,11 +69,10 @@ class Scene:
         index = 0
         for canvas_item in self.canvas_objs:
             obj, sdf_expr = canvas_item
-            sdf_block += f"float sd{index} = {sdf_expr};"
-            sdf_block += f"if(sd{index} < qry.value)"
-            # 1e-8 最好换成某个 epsilon
             round_corner = f"- {obj.round_corner}" if obj.round_corner > 1e-8 else ""
-            sdf_block += "{" + f"qry.value = sd{index} {round_corner}; qry.obj_id = {index}; " + "}\n"
+            sdf_block += f"float sd{index} = {sdf_expr}{round_corner};"
+            sdf_block += f"if(sd{index} < qry.value)"
+            sdf_block += "{" + f"qry.value = sd{index}; qry.obj_id = {index}; " + "}\n"
             color = obj.texture.color
             color_block += (
                 f"if(obj_id == {index}) return vec4("

konabot/plugins/marchtoy/shaders/frag.glsl

@@ -1,6 +1,7 @@
 #version 330
 const float EPS = 0.001;
 const int MAX_ITER = 128;
+const float INF = 1e10;
 
 uniform vec2 u_resolution;
 out vec4 fragColor;
@@ -43,7 +44,7 @@ float smin( float a, float b, float k )
 }
 sdQuery sd(vec3 p) {
     sdQuery qry;
-    qry.value = 100000000.0;
+    qry.value = INF;
     qry.obj_id = -1;
     <SDF_BLOCK>
     return qry;