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import moderngl
import numpy as np
from PIL import Image
ctx = moderngl.create_context(standalone=True)
prog = ctx.program(
vertex_shader="""
#version 330
in vec2 in_vert;
in vec3 in_color;
uniform float scale;
out vec3 v_color;
void main() {
v_color = in_color;
gl_Position = vec4(in_vert * scale, 0.0, 1.0);
}
""",
fragment_shader="""
#version 330
in vec3 v_color;
out vec3 f_color;
void main() {
f_color = v_color;
}
""",
)
vertices = np.asarray([
-0.75, -0.75, 1, 0, 0,
0.75, -0.75, 0, 1, 0,
0.0, 0.649, 0, 0, 1
], dtype='f4')
vbo = ctx.buffer(vertices.tobytes())
vao = ctx.vertex_array(prog, vbo, "in_vert", "in_color")
fbo = ctx.framebuffer(
color_attachments=[ctx.texture((512, 512), 3)]
)
fbo.use()
fbo.clear(0.0, 0.0, 0.0, 1.0)
vao.program['scale'] = 2
vao.render() # "mode" is moderngl.TRIANGLES by default
Image.frombytes(
"RGB", fbo.size, fbo.color_attachments[0].read(),
"raw", "RGB", 0, -1
).show()
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