1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
'''
Renders a color triangle with imageStore
'''
from _example import Example
class HelloWorld(Example):
gl_version = (4, 5)
title = "Empty Framebuffer"
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 450 core
out vec3 v_color;
vec2 positions[3] = vec2[](
vec2(0.0, 0.8),
vec2(-0.6, -0.8),
vec2(0.6, -0.8)
);
vec3 colors[3] = vec3[](
vec3(1.0, 0.0, 0.0),
vec3(0.0, 1.0, 0.0),
vec3(0.0, 0.0, 1.0)
);
void main() {
gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);
v_color = colors[gl_VertexID];
}
''',
fragment_shader='''
#version 450 core
in vec3 v_color;
layout(rgba8, binding = 0) writeonly uniform image2D output_image;
void main() {
imageStore(output_image, ivec2(gl_FragCoord.xy), vec4(v_color, 1.0));
}
''',
)
self.prog['output_image'] = 0
self.texture = self.ctx.texture(self.window_size, components=4)
self.texture.bind_to_image(0, read=False, write=True)
self.empty_framebuffer = self.ctx.empty_framebuffer(self.window_size)
self.vao = self.ctx.vertex_array(self.prog, [])
self.vao.scope = self.ctx.scope(self.empty_framebuffer)
self.vao.vertices = 3
self.fbo = self.ctx.framebuffer([self.texture])
def render(self, time, frame_time):
self.fbo.clear(1.0, 1.0, 1.0, 1.0)
self.vao.render()
self.ctx.memory_barrier()
self.ctx.copy_framebuffer(self.ctx.screen, self.fbo)
if __name__ == '__main__':
HelloWorld.run()
|
