347 lines
11 KiB
Python
347 lines
11 KiB
Python
from collections.abc import Iterable
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from enum import Enum
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from typing import Literal, cast, overload
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import gi
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import OpenGL.GL as GL
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from fabric import Property, Signal
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from fabric.widgets.widget import Widget
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from OpenGL.GL.shaders import compileProgram, compileShader
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gi.require_version("Gtk", "3.0")
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from gi.repository import Gdk, GdkPixbuf, GLib, Gtk
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class ShadertoyUniformType(Enum):
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FLOAT = 1
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INTEGER = 2
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VECTOR = 3
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TEXTURE = 4
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class ShadertoyCompileError(Exception): ...
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class Shadertoy(Gtk.GLArea, Widget):
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@Signal
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def ready(self) -> None: ...
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@Property(str, "read-write")
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def shader_buffer(self) -> str:
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return self._shader_buffer
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@shader_buffer.setter
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def shader_buffer(self, shader_buffer: str) -> None:
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self._shader_buffer = shader_buffer
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if not self._ready:
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return
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self._shader_uniforms.clear()
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self.do_realize()
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self.queue_draw()
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return
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DEFAULT_VERTEX_SHADER = """
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in vec2 position;
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void main() {
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gl_Position = vec4(position, 0.0, 1.0);
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}
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"""
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DEFAULT_FRAGMENT_UNIFORMS = """
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uniform vec3 iResolution; // viewport resolution (in pixels)
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uniform float iTime; // shader playback time (in seconds)
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uniform float iTimeDelta; // render time (in seconds)
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uniform float iFrameRate; // shader frame rate
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uniform int iFrame; // shader playback frame
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uniform float iChannelTime[4]; // channel playback time (in seconds)
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uniform vec3 iChannelResolution[4]; // channel resolution (in pixels)
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uniform vec4 iMouse; // mouse pixel coords. xy: current (if MLB down), zw: click
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uniform sampler2D iChannel0; // input channel. XX = 2D/Cube
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uniform sampler2D iChannel1;
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uniform sampler2D iChannel2;
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uniform sampler2D iChannel3;
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uniform vec4 iDate; // (year, month, day, time in seconds)
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uniform float iSampleRate; // sound sample rate (i.e., 44100)
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"""
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FRAGMENT_MAIN_FUNCTION = """
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void main() {
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mainImage(gl_FragColor, gl_FragCoord.xy);
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}
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"""
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def __init__(
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self,
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shader_buffer: str,
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shader_uniforms: list[
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tuple[
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str,
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ShadertoyUniformType,
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bool | float | int | tuple[float, ...] | GdkPixbuf.Pixbuf,
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]
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]
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| None = None,
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name: str | None = None,
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visible: bool = True,
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all_visible: bool = False,
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style: str | None = None,
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style_classes: Iterable[str] | str | None = None,
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tooltip_text: str | None = None,
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tooltip_markup: str | None = None,
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h_align: Literal["fill", "start", "end", "center", "baseline"]
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| Gtk.Align
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| None = None,
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v_align: Literal["fill", "start", "end", "center", "baseline"]
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| Gtk.Align
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| None = None,
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h_expand: bool = False,
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v_expand: bool = False,
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size: Iterable[int] | int | None = None,
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**kwargs,
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):
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Gtk.GLArea.__init__(
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self
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)
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Widget.__init__(
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self,
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name,
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visible,
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all_visible,
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style,
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style_classes,
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tooltip_text,
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tooltip_markup,
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h_align,
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v_align,
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h_expand,
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v_expand,
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size,
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**kwargs,
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)
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self._shader_buffer = shader_buffer
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self._shader_uniforms = shader_uniforms or []
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self.set_required_version(3, 3)
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self.set_has_depth_buffer(False)
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self.set_has_stencil_buffer(False)
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self._ready = False
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self._program = None
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self._vao = None
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self._quad_vbo = None
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self._texture_units = {}
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self._start_time = GLib.get_monotonic_time() / 1e6
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self._frame_time = self._start_time
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self._frame_count = 0
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self._tick_id = self.add_tick_callback(lambda *_: (self.queue_draw(), True)[1])
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def do_bake_program(self):
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try:
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vertex_shader = compileShader(
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self.DEFAULT_VERTEX_SHADER, GL.GL_VERTEX_SHADER
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)
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fragment_shader = compileShader(
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self.DEFAULT_FRAGMENT_UNIFORMS
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+ self._shader_buffer
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+ self.FRAGMENT_MAIN_FUNCTION,
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GL.GL_FRAGMENT_SHADER,
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)
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except Exception as e:
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raise ShadertoyCompileError(
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f"couldn't compile the provided shader, OpenGL error:\n {e}"
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)
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return compileProgram(vertex_shader, fragment_shader)
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def do_realize(self, *_):
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Gtk.GLArea.do_realize(self)
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if not self._ready:
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ctx = self.get_context()
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if (err := self.get_error()) or not ctx:
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raise RuntimeError(
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f"couldn't initialize the drawing context, error: {err or 'context is None'}"
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)
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ctx.make_current()
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if self._program:
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GL.glDeleteProgram(self._program)
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self._program = None
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self._program = self.do_bake_program()
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GL.glEnable(GL.GL_BLEND)
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GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA)
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self._quad_vbo = GL.glGenBuffers(1)
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GL.glBindBuffer(GL.GL_ARRAY_BUFFER, self._quad_vbo)
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quad_verts = (-1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0)
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array_type = GL.GLfloat * len(quad_verts)
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GL.glBufferData(
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GL.GL_ARRAY_BUFFER,
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len(quad_verts) * 4,
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array_type(*quad_verts),
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GL.GL_STATIC_DRAW,
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)
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self._vao = GL.glGenVertexArrays(1)
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GL.glBindVertexArray(self._vao)
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position = GL.glGetAttribLocation(self._program, "position")
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GL.glEnableVertexAttribArray(position)
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GL.glVertexAttribPointer(position, 2, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
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for uname, utype, uvalue in self._shader_uniforms:
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self.set_uniform(uname, utype, uvalue)
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self._ready = True
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self.ready()
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return
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def do_get_timing(self) -> tuple[float, float, float]:
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current_time = GLib.get_monotonic_time() / 1e6
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delta_time = current_time - self._frame_time
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return current_time, delta_time, (1.0 / delta_time) if delta_time > 0 else 0.0
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def do_post_render(self, time: float):
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self._frame_time = time
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self._frame_count += 1
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return
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def do_render(self, ctx: Gdk.GLContext):
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if not self._program:
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if self._tick_id:
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self.remove_tick_callback(self._tick_id)
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self._tick_id = 0
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return False
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GL.glUseProgram(self._program)
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GL.glClear(GL.GL_COLOR_BUFFER_BIT)
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alloc = self.get_allocation()
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width: int = alloc.width
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height: int = alloc.height
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mouse_pos = cast(tuple[int, int], self.get_pointer())
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current_time, delta_time, frame_rate = self.do_get_timing()
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self.set_uniform(
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"iTime", ShadertoyUniformType.FLOAT, current_time - self._start_time
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)
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self.set_uniform("iFrame", ShadertoyUniformType.INTEGER, self._frame_count)
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self.set_uniform("iTimeDelta", ShadertoyUniformType.FLOAT, delta_time)
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self.set_uniform("iFrameRate", ShadertoyUniformType.FLOAT, frame_rate)
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self.set_uniform(
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"iResolution", ShadertoyUniformType.VECTOR, (width, height, 1.0)
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)
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self.set_uniform(
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"iMouse",
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ShadertoyUniformType.VECTOR,
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(mouse_pos[0], height - mouse_pos[1], 0, 0),
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)
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GL.glBindVertexArray(self._vao)
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GL.glDrawArrays(GL.GL_TRIANGLE_STRIP, 0, 4)
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self.do_post_render(current_time)
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return True
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def do_resize(self, width: int, height: int):
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Gtk.GLArea.do_resize(self, width, height)
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GL.glViewport(0, 0, width, height)
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return
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@overload
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def set_uniform(
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self, name: str, type: Literal[ShadertoyUniformType.FLOAT], value: float
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): ...
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@overload
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def set_uniform(
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self, name: str, type: Literal[ShadertoyUniformType.INTEGER], value: int
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): ...
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@overload
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def set_uniform(
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self,
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name: str,
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type: Literal[ShadertoyUniformType.VECTOR],
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value: tuple[float, ...],
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): ...
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@overload
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def set_uniform(
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self,
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name: str,
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type: Literal[ShadertoyUniformType.TEXTURE],
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value: GdkPixbuf.Pixbuf,
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): ...
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def set_uniform(
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self,
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name: str,
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type: ShadertoyUniformType,
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value: bool | float | int | tuple[float, ...] | GdkPixbuf.Pixbuf,
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):
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if not self._program:
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raise RuntimeError("the shader program is not initialized")
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GL.glUseProgram(self._program)
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location = GL.glGetUniformLocation(self._program, name)
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match type:
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case ShadertoyUniformType.VECTOR:
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value = cast(tuple[float, ...], value)
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(
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GL.glUniform2f
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if (vlen := len(value)) == 2
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else GL.glUniform3f
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if vlen == 3
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else GL.glUniform4f
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)(location, *value)
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case ShadertoyUniformType.FLOAT:
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GL.glUniform1f(location, value)
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case ShadertoyUniformType.INTEGER:
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GL.glUniform1i(location, value)
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case ShadertoyUniformType.TEXTURE:
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value = cast(GdkPixbuf.Pixbuf, value).flip(False)
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format = GL.GL_RGBA if value.get_has_alpha() else GL.GL_RGB
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if name not in self._texture_units:
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texture = GL.glGenTextures(1)
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self._texture_units[name] = (len(self._texture_units), texture)
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else:
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texture_unit, texture = self._texture_units[name]
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texture_unit = self._texture_units[name][0]
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GL.glActiveTexture(GL.GL_TEXTURE0 + texture_unit)
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GL.glBindTexture(GL.GL_TEXTURE_2D, texture)
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GL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_REPEAT)
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GL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_REPEAT)
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GL.glTexParameteri(
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GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR
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)
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GL.glTexParameteri(
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GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR
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)
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GL.glTexImage2D(
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GL.GL_TEXTURE_2D,
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0,
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format,
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value.get_width(),
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value.get_height(),
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0,
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format,
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GL.GL_UNSIGNED_BYTE,
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value.get_pixels(),
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)
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GL.glGenerateMipmap(GL.GL_TEXTURE_2D)
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GL.glUniform1i(location, texture_unit)
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