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import numpy
from pyrr import matrix44
from pathlib import Path
import moderngl
from moderngl_window.opengl.vao import VAO
from moderngl_window import resources
from moderngl_window.meta import (
DataDescription,
TextureDescription,
ProgramDescription,
)
from .base import BaseText, FontMeta
resources.register_dir(Path(__file__).parent.resolve())
class TextWriter2D(BaseText):
"""Simple monspaced bitmapped text renderer"""
def __init__(self):
super().__init__()
meta = FontMeta(resources.data.load(
DataDescription(path="bitmapped/text/meta.json")
))
self._texture = resources.textures.load(
TextureDescription(
path="bitmapped/textures/VeraMono.png",
kind="array",
mipmap=True,
layers=meta.characters,
)
)
self._program = resources.programs.load(
ProgramDescription(path="bitmapped/programs/text_2d.glsl")
)
self._init(meta)
self._string_buffer = self.ctx.buffer(reserve=1024 * 4)
self._string_buffer.clear(chunk=b'\32')
pos = self.ctx.buffer(data=bytes([0] * 4 * 3))
self._vao = VAO("textwriter", mode=moderngl.POINTS)
self._vao.buffer(pos, '3f', 'in_position')
self._vao.buffer(self._string_buffer, '1u/i', 'in_char_id')
self._text: str = None
@property
def text(self) -> str:
return self._text
@text.setter
def text(self, value: str):
self._text = value
self._string_buffer.orphan(size=len(value) * 4)
self._string_buffer.clear(chunk=b'\32')
self._write(value)
def _write(self, text: str):
self._string_buffer.clear(chunk=b'\32')
self._string_buffer.write(
numpy.fromiter(
self._translate_string(text),
dtype=numpy.uint32,
)
)
def draw(self, pos, length=-1, size=24.0):
# Calculate ortho projection based on viewport
vp = self.ctx.fbo.viewport
w, h = vp[2], vp[3]
projection = matrix44.create_orthogonal_projection_matrix(
0, # left
w, # right
0, # bottom
h, # top
1.0, # near
-1.0, # far
dtype=numpy.float32,
)
self._texture.use(location=0)
self._program["m_proj"].write(projection)
self._program["text_pos"].value = pos
self._program["font_texture"].value = 0
self._program["char_size"].value = self._meta.char_aspect_wh * size, size
self._vao.render(self._program, instances=len(self._text))
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