尝试 gl backend

2026-04-25 14:31:23 +08:00
parent 81e0c05686
commit cc97ca5493
10 changed files with 291 additions and 15 deletions
--- a/konabot/plugins/marchtoy/command.py
+++ b/konabot/plugins/marchtoy/command.py
@ -18,8 +18,8 @@ from dataclasses import dataclass
 import re
 import numpy as np
 from dataclasses import dataclass
-from konabot.plugins.marchtoy.obj import Object, Camera, OBJECT_ENTRIES
-from konabot.plugins.marchtoy.op import OPERATION_ENTRIES
+from obj import Object, Camera, OBJECT_ENTRIES
+from op import OPERATION_ENTRIES
 from typing import Optional

@dataclass
@ -113,8 +113,8 @@ class Scene:
    def __str__(self) -> str:
        return ", ".join([str(type(obj)) for obj in self.canvas_objs])

-    def compile(self) -> str:
-        PATH = pathlib.Path(__file__).parent / "shaders" / "raymarch.sksl"
+    def compile(self, fs_src: str = "frag.glsl") -> str:
+        PATH = pathlib.Path(__file__).parent / "shaders" / fs_src
        with PATH.open(encoding="utf-8") as f:
            content = f.read()
        sdf_block: str = ""
--- a/konabot/plugins/marchtoy/gl_render.py
+++ b/konabot/plugins/marchtoy/gl_render.py
@ -0,0 +1,37 @@
+"""
+headless moderngl
+"""
+import pathlib
+import moderngl
+from command import Scene
+import numpy as np
+from PIL import Image
+
+def render(vs: str, fs: str, res: tuple[int, int]):
+    ctx = moderngl.create_context(standalone=True)
+    try:
+        program = ctx.program(
+            vertex_shader=vs,
+            fragment_shader=fs
+        )
+    except Exception as _:
+        raise Exception("cannot compile glsl")
+    uniform = program['u_resolution']
+    uniform.write(np.array(res, dtype=np.float32))
+    vertices = np.array([-1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0], dtype=np.float32)
+    indices = np.array([0, 1, 2, 1, 2, 3], dtype=np.int32)
+    ibo = ctx.buffer(indices)
+    vbo = ctx.buffer(vertices)
+    vao = ctx.vertex_array(program, vbo, 'in_position', index_buffer = ibo)
+    fbo = ctx.simple_framebuffer(res)
+    fbo.use()
+    fbo.clear(0.0, 0.0, 0.0, 0.0)
+    vao.render(moderngl.TRIANGLES)
+    Image.frombytes('RGB', fbo.size, fbo.read(), 'raw', 'RGB', 0, -1).show()
+
+fs = Scene("cube camera.pos(1).lookat(0)").compile()
+PATH = pathlib.Path(__file__).parent / "shaders"
+with (PATH / "vert.glsl").open(encoding='utf-8') as f:
+    vs = f.read()
+    
+render(vs, fs, (320, 320))
--- a/konabot/plugins/marchtoy/obj.py
+++ b/konabot/plugins/marchtoy/obj.py
@ -1,6 +1,6 @@
 import numpy as np
-from konabot.plugins.marchtoy.texture import Texture
-from konabot.plugins.marchtoy.utilities import ArgParser, SkslFormatter
+from texture import Texture
+from utilities import ArgParser, Formatter

 OBJECT_ENTRIES = {}

@ -65,7 +65,6 @@ class Transform:
        zaxis = Transform.normalize(q - p)
        xaxis = Transform.normalize(np.cross(zaxis, up))
        yaxis = Transform.normalize(np.cross(xaxis, zaxis))
-        # 约定本地 -Z 为“朝前”，这样和 shader 中使用的相机射线方向保持一致。
        self.t[:3, 0] = xaxis
        self.t[:3, 1] = yaxis
        self.t[:3, 2] = -zaxis
@ -73,7 +72,7 @@ class Transform:

    def p_expr(self) -> str:
        inv = np.linalg.inv(self.t)  # + 1e-5 * np.identity(4, dtype=np.float32))
-        return f"({SkslFormatter.mat4(inv)} * float4(p, 1.0)).xyz"
+        return f"({Formatter.float4(inv)} * float4(p, 1.0)).xyz"


 class Object:
--- a/konabot/plugins/marchtoy/op.py
+++ b/konabot/plugins/marchtoy/op.py
@ -1,6 +1,6 @@
-from konabot.plugins.marchtoy.obj import Object
+from obj import Object
 import numpy as np
-from konabot.plugins.marchtoy.utilities import ArgParser
+from utilities import ArgParser

 OPERATION_ENTRIES = {}

--- a/konabot/plugins/marchtoy/render.py
+++ b/konabot/plugins/marchtoy/render.py
@ -1,4 +1,4 @@
-from konabot.plugins.marchtoy.command import Scene
+from command import Scene
 import skia
 import struct
 from PIL import Image
--- a/konabot/plugins/marchtoy/shaders/frag.glsl
+++ b/konabot/plugins/marchtoy/shaders/frag.glsl
@ -0,0 +1,83 @@
+#version 330
+uniform vec2 u_resolution;
+// compatibility
+#define float4x4 mat4x4
+#define float4 vec4
+#define float3 vec3
+#define float2 vec2
+
+const float EPS = 0.001;
+const int MAX_ITER = 64;
+
+in vec2 fragCoord;
+out vec4 fragColor;
+
+struct sdQuery {
+    float value;
+    int obj_id;
+};
+
+float sdCube(vec3 p, vec3 b) {
+    p = abs(p) - b;
+    return length(max(p, 0.0)) + min(max(p.x, max(p.y, p.z)), 0.0);
+}
+
+float sdSphere(vec3 p, float r) {
+    return length(p) - r;
+}
+
+sdQuery sd(vec3 p) {
+    sdQuery qry;
+    qry.value = 100000000.0;
+    qry.obj_id = -1;
+    <SDF_BLOCK>
+    return qry;
+}
+
+vec3 nrm(vec3 p) {
+    vec2 d = vec2(EPS, 0.0);
+    return normalize(vec3(
+        sd(p + d.xyy).value - sd(p - d.xyy).value,
+        sd(p + d.yxy).value - sd(p - d.yxy).value,
+        sd(p + d.yyx).value - sd(p - d.yyx).value
+    ));
+}
+
+vec4 materialColor(int obj_id) {
+    <COLOR_BLOCK>
+    return vec4(1.0);
+}
+
+vec4 color(vec3 p, int obj_id) {
+    vec3 normal = nrm(p);
+    vec3 light_dir = normalize(vec3(0.5, 0.8, -0.6));
+    float light = 0.2 + 0.8 * max(dot(normal, light_dir), 0.0);
+    vec4 base = materialColor(obj_id);
+    return vec4(base.rgb * light, base.a);
+}
+
+vec4 march(vec3 p, vec3 r) {
+    sdQuery qry;
+    vec4 col = vec4(0.0);
+    for(int i = 0; i < MAX_ITER; ++i) {
+        qry = sd(p);
+        if(qry.value < EPS){
+            col = color(p, qry.obj_id);
+            break;
+        }
+        p += qry.value * r;
+    }
+    return col;
+}
+
+void main() {
+    vec2 uv = -2. * (fragCoord / u_resolution - .5) * vec2(u_resolution.x / u_resolution.y, 1.);
+    vec3 c_p = vec3(<CAM_POS>);
+    vec3 c_z = normalize(vec3(<CAM_DIR>));
+    vec3 world_up = abs(c_z.y) > 0.999 ? vec3(0., 0., 1.) : vec3(0., 1., 0.);
+    vec3 c_x = normalize(cross(c_z, world_up));
+    vec3 c_y = normalize(cross(c_x, c_z));
+    mat3 view = mat3(c_x, c_y, c_z);
+    vec3 r = normalize(vec3(uv, <CAM_FOCUS>));
+    fragColor = march(c_p, view * r);
+}
--- a/konabot/plugins/marchtoy/shaders/vert.glsl
+++ b/konabot/plugins/marchtoy/shaders/vert.glsl
@ -0,0 +1,7 @@
+#version 330
+in vec2 in_position;
+out vec2 fragCoord;
+
+void main() {
+    gl_Position = vec4(in_position, 0.0, 1.0);
+}
--- a/konabot/plugins/marchtoy/utilities.py
+++ b/konabot/plugins/marchtoy/utilities.py
@ -1,10 +1,10 @@
 import numpy as np
-from konabot.plugins.marchtoy.texture import COLORS
+from texture import COLORS


-class SkslFormatter:
+class Formatter:
    @staticmethod
-    def mat4(m: np.ndarray) -> str:
+    def float4(m: np.ndarray) -> str:
        if m.shape != (4, 4):
            m = np.identity(4)
        v_0 = ", ".join([str(x) for x in m[0]])
--- a/poetry.lock
+++ b/poetry.lock
@ -1709,6 +1709,85 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "mirrors"

+[[package]]
+name = "glcontext"
+version = "3.0.0"
+description = "Portable Headless OpenGL Context"
+optional = false
+python-versions = "*"
+groups = ["main"]
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 [[package]]
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 version = "3.4.0"
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 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "mirrors"

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+]
+
+[package.dependencies]
+glcontext = ">=3.0.0"
+
+[package.extras]
+headless = ["glcontext (>=3.0.0)"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "mirrors"
+
 [[package]]
 name = "msgpack"
 version = "1.1.2"
@ -5376,4 +5525,4 @@ reference = "mirrors"
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.12,<4.0"
-content-hash = "cb843d7ddb9458a0c0fd43f254b0362a05c0a017cf1df1d855d34caa98f4d10b"
+content-hash = "ce664db91fb8047d071f8d47890cd053412a961e594db41953345e87bc34c64a"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -39,6 +39,7 @@ dependencies = [
  "aiosignal (>=1.4.0,<2.0.0)",
  "pytest-mock (>=3.15.1,<4.0.0)",
  "skia-python (>=144.0.post2,<145.0)",
+  "moderngl (>=5.12.0,<6.0.0)",
 ]

 [tool.poetry]