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"""
Example headless EGL rendering on linux in a VM
"""
import numpy as np
from PIL import Image
import moderngl
ctx = moderngl.create_context(standalone=True, backend='egl')
fbo = ctx.simple_framebuffer((512, 512), components=4)
fbo.use()
vertices = np.array([
-1.0, -1.0, 1.0, 0.0, 0.0,
1.0, -1.0, 0.0, 1.0, 0.0,
0.0, 1.0, 0.0, 0.0, 1.0],
dtype='f4',
)
prog = ctx.program(vertex_shader="""
#version 330
in vec2 in_vert;
in vec3 in_color;
out vec3 color;
void main() {
gl_Position = vec4(in_vert, 0.0, 1.0);
color = in_color;
}
""",
fragment_shader="""
#version 330
out vec4 fragColor;
in vec3 color;
void main() {
fragColor = vec4(color, 1.0);
}
""",
)
vao = ctx.simple_vertex_array(prog, ctx.buffer(vertices), 'in_vert', 'in_color')
vao.render(mode=moderngl.TRIANGLES)
image = Image.frombytes('RGBA', (512, 512), fbo.read(components=4))
image = image.transpose(Image.FLIP_TOP_BOTTOM)
image.save('triangle.png', format='png')
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