blender/release/scripts/modules/gpu_extras/presets.py

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#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
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# GNU General Public License for more details.
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def draw_circle_2d(position, color, radius, segments=32):
    from math import sin, cos, pi
    import gpu
    from gpu.types import (
        GPUBatch,
        GPUVertBuf,
        GPUVertFormat,
    )

    if segments <= 0:
        raise ValueError("Amount of segments must be greater than 0.")

    with gpu.matrix.push_pop():
        gpu.matrix.translate(position)
        gpu.matrix.scale_uniform(radius)
        mul = (1.0 / (segments - 1)) * (pi * 2)
        verts = [(sin(i * mul), cos(i * mul)) for i in range(segments)]
        fmt = GPUVertFormat()
        pos_id = fmt.attr_add(id="pos", comp_type='F32', len=2, fetch_mode='FLOAT')
        vbo = GPUVertBuf(len=len(verts), format=fmt)
        vbo.attr_fill(id=pos_id, data=verts)
        batch = GPUBatch(type='LINE_STRIP', buf=vbo)
        shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
        batch.program_set(shader)
        shader.uniform_float("color", color)
        batch.draw()


def draw_texture_2d(texture_id, position, width, height):
    import gpu
    import bgl
    from . batch import batch_for_shader

    coords = ((0, 0), (1, 0), (1, 1), (0, 1))

    shader = gpu.shader.from_builtin('2D_IMAGE')
    batch = batch_for_shader(shader, 'TRI_FAN',
        {"pos" : coords,
         "texCoord" : coords})

    bgl.glActiveTexture(bgl.GL_TEXTURE0)
    bgl.glBindTexture(bgl.GL_TEXTURE_2D, texture_id)

    with gpu.matrix.push_pop():
        gpu.matrix.translate(position)
        gpu.matrix.scale((width, height))

        shader = gpu.shader.from_builtin('2D_IMAGE')
        shader.bind()
        shader.uniform_int("image", 0)
        batch.draw(shader)