Germano Cavalcante
2ce8b01c59
This simplifies python code.
When we call a method like shader.uniform_float("color", (1,1,1,1)),
we expect the shader's uniform to be updated regardless of whether the
shader is bound or not.
And `batch.draw()` already calls `GPU_shader_bind` inside.
Differential Revision: https://developer.blender.org/D15929
92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
# SPDX-License-Identifier: GPL-2.0-or-later
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def draw_circle_2d(position, color, radius, *, segments=None):
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"""
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Draw a circle.
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:arg position: Position where the circle will be drawn.
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:type position: 2D Vector
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:arg color: Color of the circle. To use transparency GL_BLEND has to be enabled.
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:type color: tuple containing RGBA values
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:arg radius: Radius of the circle.
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:type radius: float
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:arg segments: How many segments will be used to draw the circle.
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Higher values give better results but the drawing will take longer.
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If None or not specified, an automatic value will be calculated.
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:type segments: int or None
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"""
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from math import sin, cos, pi, ceil, acos
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import gpu
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from gpu.types import (
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GPUBatch,
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GPUVertBuf,
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GPUVertFormat,
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)
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if segments is None:
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max_pixel_error = 0.25 # TODO: multiply 0.5 by display dpi
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segments = int(ceil(pi / acos(1.0 - max_pixel_error / radius)))
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segments = max(segments, 8)
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segments = min(segments, 1000)
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if segments <= 0:
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raise ValueError("Amount of segments must be greater than 0.")
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with gpu.matrix.push_pop():
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gpu.matrix.translate(position)
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gpu.matrix.scale_uniform(radius)
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mul = (1.0 / (segments - 1)) * (pi * 2)
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verts = [(sin(i * mul), cos(i * mul)) for i in range(segments)]
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fmt = GPUVertFormat()
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pos_id = fmt.attr_add(id="pos", comp_type='F32', len=2, fetch_mode='FLOAT')
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vbo = GPUVertBuf(len=len(verts), format=fmt)
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vbo.attr_fill(id=pos_id, data=verts)
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batch = GPUBatch(type='LINE_STRIP', buf=vbo)
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shader = gpu.shader.from_builtin('UNIFORM_COLOR')
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batch.program_set(shader)
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shader.uniform_float("color", color)
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batch.draw()
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def draw_texture_2d(texture, position, width, height):
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"""
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Draw a 2d texture.
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:arg texture: GPUTexture to draw (e.g. gpu.texture.from_image(image) for :class:`bpy.types.Image`).
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:type texture: :class:`gpu.types.GPUTexture`
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:arg position: Position of the lower left corner.
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:type position: 2D Vector
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:arg width: Width of the image when drawn (not necessarily
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the original width of the texture).
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:type width: float
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:arg height: Height of the image when drawn.
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:type height: float
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"""
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import gpu
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from . batch import batch_for_shader
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coords = ((0, 0), (1, 0), (1, 1), (0, 1))
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shader = gpu.shader.from_builtin('IMAGE')
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batch = batch_for_shader(
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shader, 'TRI_FAN',
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{"pos": coords, "texCoord": coords},
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)
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with gpu.matrix.push_pop():
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gpu.matrix.translate(position)
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gpu.matrix.scale((width, height))
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shader = gpu.shader.from_builtin('IMAGE')
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if isinstance(texture, int):
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# Call the legacy bgl to not break the existing API
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import bgl
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bgl.glActiveTexture(bgl.GL_TEXTURE0)
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bgl.glBindTexture(bgl.GL_TEXTURE_2D, texture)
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shader.uniform_int("image", 0)
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else:
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shader.uniform_sampler("image", texture)
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batch.draw(shader)
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