def histogram(cfg):
"""Histogram using compute shaders"""
m0 = cfg.medias[0]
cfg.duration = m0.duration
cfg.aspect_ratio = (m0.width, m0.height)
g = ngl.Group()
m = ngl.Media(cfg.medias[0].filename)
t = ngl.Texture2D(data_src=m)
h = ngl.Block(label="histogram_block", layout="std430")
h.add_fields(
ngl.BufferUInt(256, label="r"),
ngl.BufferUInt(256, label="g"),
ngl.BufferUInt(256, label="b"),
ngl.UniformUInt(label="maximum"),
)
r = ngl.RenderTexture(t)
proxy_size = 128
proxy = ngl.Texture2D(width=proxy_size, height=proxy_size)
rtt = ngl.RenderToTexture(r)
rtt.add_color_textures(proxy)
g.add_children(rtt)
compute_program = ngl.ComputeProgram(cfg.get_comp("histogram-clear"),
workgroup_size=(1, 1, 1))
compute_program.update_properties(hist=ngl.ResourceProps(writable=True))
compute = ngl.Compute(workgroup_count=(256, 1, 1),
program=compute_program,
label="histogram-clear")
compute.update_resources(hist=h)
g.add_children(compute)
local_size = 8
group_size = proxy_size / local_size
compute_program = ngl.ComputeProgram(cfg.get_comp("histogram-exec"),
workgroup_size=(local_size,
local_size, 1))
compute = ngl.Compute(workgroup_count=(group_size, group_size, 1),
program=compute_program,
label="histogram-exec")
compute.update_resources(hist=h, source=proxy)
compute_program.update_properties(hist=ngl.ResourceProps(writable=True))
compute_program.update_properties(source=ngl.ResourceProps(as_image=True))
g.add_children(compute)
q = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
p = ngl.Program(vertex=cfg.get_vert("histogram-display"),
fragment=cfg.get_frag("histogram-display"))
p.update_vert_out_vars(var_uvcoord=ngl.IOVec2(),
var_tex0_coord=ngl.IOVec2())
render = ngl.Render(q, p)
render.update_frag_resources(tex0=t, hist=h)
g.add_children(render)
return g
array_float=lambda data: ngl.BufferFloat(data=data),
array_int=lambda data: ngl.BufferInt(data=data),
array_ivec2=lambda data: ngl.BufferIVec2(data=data),
array_ivec3=lambda data: ngl.BufferIVec3(data=data),
array_ivec4=lambda data: ngl.BufferIVec4(data=data),
array_mat4=lambda data: ngl.BufferMat4(data=data),
array_vec2=lambda data: ngl.BufferVec2(data=data),
array_vec3=lambda data: ngl.BufferVec3(data=data),
array_vec4=lambda data: ngl.BufferVec4(data=data),
single_bool=lambda data: ngl.UniformBool(data),
single_float=lambda data: ngl.UniformFloat(data),
single_int=lambda data: ngl.UniformInt(data),
single_ivec2=lambda data: ngl.UniformIVec2(data),
single_ivec3=lambda data: ngl.UniformIVec3(data),
single_ivec4=lambda data: ngl.UniformIVec4(data),
single_uint=lambda data: ngl.UniformUInt(data),
single_uvec2=lambda data: ngl.UniformUIVec2(data),
single_uvec3=lambda data: ngl.UniformUIVec3(data),
single_uvec4=lambda data: ngl.UniformUIVec4(data),
single_mat4=lambda data: ngl.UniformMat4(data),
single_quat_mat4=lambda data: ngl.UniformQuat(data, as_mat4=True),
single_quat_vec4=lambda data: ngl.UniformQuat(data, as_mat4=False),
single_vec2=lambda data: ngl.UniformVec2(data),
single_vec3=lambda data: ngl.UniformVec3(data),
single_vec4=lambda data: ngl.UniformVec4(data),
)
def _get_field_decl(layout, f):
t = f['type']
t = t.split('_')[1] if t.startswith('quat') else t
def histogram(cfg):
'''Histogram using compute shaders'''
m0 = cfg.medias[0]
cfg.duration = m0.duration
cfg.aspect_ratio = (m0.width, m0.height)
g = ngl.Group()
m = ngl.Media(cfg.medias[0].filename)
t = ngl.Texture2D(data_src=m)
h = ngl.Block(label='histogram_block', layout='std430')
h.add_fields(
ngl.BufferUInt(256, label='r'),
ngl.BufferUInt(256, label='g'),
ngl.BufferUInt(256, label='b'),
ngl.UniformUInt(label='maximum'),
)
q = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
p = ngl.Program(vertex=cfg.get_vert('texture'),
fragment=cfg.get_frag('texture'))
p.update_vert_out_vars(var_uvcoord=ngl.IOVec2(),
var_tex0_coord=ngl.IOVec2())
r = ngl.Render(q, p)
r.update_frag_resources(tex0=t)
proxy_size = 128
proxy = ngl.Texture2D(width=proxy_size, height=proxy_size)
rtt = ngl.RenderToTexture(r)
rtt.add_color_textures(proxy)
g.add_children(rtt)
compute_program = ngl.ComputeProgram(cfg.get_comp('histogram-clear'))
compute = ngl.Compute(256, 1, 1, compute_program, label='histogram-clear')
compute.update_resources(hist=h)
g.add_children(compute)
local_size = 8
group_size = proxy_size / local_size
compute_shader = cfg.get_comp('histogram-exec') % {
'local_size': local_size
}
compute_program = ngl.ComputeProgram(compute_shader)
compute = ngl.Compute(group_size,
group_size,
1,
compute_program,
label='histogram-exec')
compute.update_resources(hist=h, source=proxy)
compute_program.update_properties(source=ngl.ResourceProps(as_image=True))
g.add_children(compute)
q = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
p = ngl.Program(vertex=cfg.get_vert('histogram-display'),
fragment=cfg.get_frag('histogram-display'))
p.update_vert_out_vars(var_uvcoord=ngl.IOVec2(),
var_tex0_coord=ngl.IOVec2())
render = ngl.Render(q, p)
render.update_frag_resources(tex0=t, hist=h)
g.add_children(render)
return g
def histogram(cfg):
'''Histogram using compute shaders'''
m0 = cfg.medias[0]
cfg.duration = m0.duration
cfg.aspect_ratio = (m0.width, m0.height)
g = ngl.Group()
m = ngl.Media(cfg.medias[0].filename)
t = ngl.Texture2D(data_src=m)
h = ngl.Block(label='histogram_block', layout='std430')
h.add_fields(
ngl.BufferUInt(256, label='r'),
ngl.BufferUInt(256, label='g'),
ngl.BufferUInt(256, label='b'),
ngl.UniformUInt(label='maximum'),
)
q = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
p = ngl.Program(vertex=cfg.get_vert('texture'),
fragment=cfg.get_frag('texture'))
r = ngl.Render(q, p)
r.update_textures(tex0=t)
proxy_size = 128
proxy = ngl.Texture2D(width=proxy_size, height=proxy_size)
rtt = ngl.RenderToTexture(r)
rtt.add_color_textures(proxy)
g.add_children(rtt)
shader_version = '310 es' if cfg.backend == 'gles' else '430'
shader_header = '#version %s\n' % shader_version
if cfg.backend == 'gles' and cfg.system == 'Android':
shader_header += '#extension GL_ANDROID_extension_pack_es31a: require\n'
compute_program = ngl.ComputeProgram(shader_header +
cfg.get_comp('histogram-clear'))
compute = ngl.Compute(256, 1, 1, compute_program, label='histogram-clear')
compute.update_blocks(histogram_buffer=h)
g.add_children(compute)
local_size = 8
group_size = proxy_size / local_size
compute_shader = cfg.get_comp('histogram-exec') % {
'local_size': local_size
}
compute_program = ngl.ComputeProgram(shader_header + compute_shader)
compute = ngl.Compute(group_size,
group_size,
1,
compute_program,
label='histogram-exec')
compute.update_blocks(histogram_buffer=h)
compute.update_textures(source=proxy)
g.add_children(compute)
q = ngl.Quad((-1, -1, 0), (2, 0, 0), (0, 2, 0))
p = ngl.Program(vertex=shader_header + cfg.get_vert('histogram-display'),
fragment=shader_header + cfg.get_frag('histogram-display'))
render = ngl.Render(q, p)
render.update_textures(tex0=t)
render.update_blocks(histogram_buffer=h)
g.add_children(render)
return g