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precise rendering for markers #18

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precise rendering for markers #18

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1cf1f9a
precise rendering for markers
JakkuSakura Nov 13, 2020
f828d17
Bugfix
JakkuSakura Nov 13, 2020
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9 changes: 7 additions & 2 deletions mplopengl/renderergl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
from matplotlib.backends import backend_agg
from matplotlib.font_manager import findfont, get_font
from matplotlib.mathtext import MathTextParser
from matplotlib.path import get_paths_extents
from matplotlib.path import get_path_collection_extents
from matplotlib.transforms import Affine2D

MIN_LINE_WIDTH = 1.5
Expand Down Expand Up @@ -496,6 +496,7 @@ def __init__(self, width, height, dpi):
self.particle_shader = Shader(vertexShaderSource, fragmentShaderSource,
{"pos": 0, "shift": 4},
["color", "trans"])
self.gpu_marker_rendering_threshold = 10000

def option_image_nocomposite(self):
return False
Expand Down Expand Up @@ -606,13 +607,17 @@ def draw_markers(self, gc, marker_path, marker_trans, path,

marker_path = marker_trans.transform_path(marker_path)
polygons = self.path_to_poly(marker_path, rgbFace is not None)
precision = positions.shape[0] < self.gpu_marker_rendering_threshold
if precision:
positions = trans.transform(positions)

arr_data = numpy.array(positions).astype(numpy.float32).tobytes()
pos_vbo = self._gpu_cache(self.context, hash(arr_data), VBO, arr_data)

with ObjectContext(self.particle_shader) as program, ClippingContext(gc):
program.bind_attr_vbo("shift", pos_vbo)
program.set_uniform3m("trans", trans.get_matrix(), transpose=True)
program.set_uniform3m("trans", Affine2D().get_matrix() if precision else trans.get_matrix(), transpose=True)

program.set_attr_divisor("pos", 0)
program.set_attr_divisor("shift", 1)

Expand Down