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from array import array
import pytest
import struct
@pytest.fixture(scope='module', autouse=True)
def res(ctx_static):
"""Global buffer we transform results into"""
return ctx_static.buffer(reserve=1024)
def test_float_uniform(ctx, res):
prog = ctx.program(
vertex_shader='''
#version 330
uniform float Uniform;
in float v_in;
out float v_out;
void main() {
v_out = Uniform * v_in;
}
''',
varyings=['v_out']
)
vbo = ctx.buffer(struct.pack('f', 1.0))
vao = ctx.simple_vertex_array(prog, vbo, 'v_in')
prog['Uniform'].value = 7.0
vao.transform(res)
val = struct.unpack('f', res.read(4))[0]
assert pytest.approx(val) == 7.0
def test_int_uniform(ctx, res):
prog = ctx.program(
vertex_shader='''
#version 330
uniform int Uniform;
in int v_in;
out int v_out;
void main() {
v_out = Uniform * v_in;
}
''',
varyings=['v_out']
)
vbo = ctx.buffer(struct.pack('i', 1))
vao = ctx.simple_vertex_array(prog, vbo, 'v_in')
prog['Uniform'].value = -2
vao.transform(res)
val = struct.unpack('i', res.read(4))[0]
assert pytest.approx(val) == -2
def test_vec_uniform(ctx, res):
prog = ctx.program(
vertex_shader='''
#version 330
uniform vec3 Uniform;
in vec3 v_in;
out vec3 v_out;
void main() {
v_out = Uniform * v_in;
}
''',
varyings=['v_out']
)
vbo = ctx.buffer(struct.pack('3f', 1.0, 1.0, 1.0))
vao = ctx.simple_vertex_array(prog, vbo, 'v_in')
prog['Uniform'].value = (0.5, 1.0, 1.5)
vao.transform(res)
x, y, z = struct.unpack('3f', res.read(12))
assert pytest.approx(x) == 0.5
assert pytest.approx(y) == 1.0
assert pytest.approx(z) == 1.5
def test_mat_uniform(ctx, res):
prog = ctx.program(
vertex_shader='''
#version 330
uniform mat2x3 Uniform;
in float v_in;
out mat2x3 v_out;
void main() {
v_out = Uniform * v_in;
}
''',
varyings=['v_out']
)
vbo = ctx.buffer(struct.pack('f', 1.0))
vao = ctx.simple_vertex_array(prog, vbo, 'v_in')
prog['Uniform'].value = (0.0, 1.0, 2.0, 3.0, 4.0, 5.0)
vao.transform(res)
m = struct.unpack('6f', res.read(24))
assert pytest.approx(m[0]) == 0.0
assert pytest.approx(m[1]) == 1.0
assert pytest.approx(m[2]) == 2.0
assert pytest.approx(m[3]) == 3.0
assert pytest.approx(m[4]) == 4.0
assert pytest.approx(m[5]) == 5.0
def test_sampler_2d(ctx):
"""RGBA8 2d sampler"""
prog = ctx.program(
vertex_shader="""
#version 330
uniform sampler2D tex;
out float color;
void main() {
color = texelFetch(tex, ivec2(gl_VertexID, 0), 0).r;
}
""",
varyings=['color'],
)
tex = ctx.texture((4, 1), 1, data=array('B', [127, 0, 255, 64]), dtype='f1')
buff = ctx.buffer(reserve=4 * 4)
vao = ctx.vertex_array(prog, [])
tex.use(0)
vao.transform(buff, vertices=4)
data = struct.unpack('4f', buff.read())
assert pytest.approx(data[0], abs=1.0e-3) == 0.498
assert pytest.approx(data[1]) == 0.0
assert pytest.approx(data[2]) == 1.0
assert pytest.approx(data[3], abs=1.0e-3) == 0.25
def test_sampler_2d_int(ctx):
prog = ctx.program(
vertex_shader="""
#version 330
uniform isampler2D tex;
out int color;
void main() {
color = texelFetch(tex, ivec2(gl_VertexID, 0), 0).r;
}
""",
varyings=['color'],
)
tex = ctx.texture((4, 1), 1, data=array('i', [-1, 0, 1000, 4353454]), dtype='i4')
buff = ctx.buffer(reserve=4 * 4)
vao = ctx.vertex_array(prog, [])
tex.use(0)
vao.transform(buff, vertices=4)
data = struct.unpack('4i', buff.read())
assert data[0] == -1
assert data[1] == 0
assert data[2] == 1000
assert data[3] == 4353454
def test_sampler_2d_uint(ctx):
prog = ctx.program(
vertex_shader="""
#version 330
uniform usampler2D tex;
out uint color;
void main() {
color = texelFetch(tex, ivec2(gl_VertexID, 0), 0).r;
}
""",
varyings=['color'],
)
tex = ctx.texture((4, 1), 1, data=array('I', [0, 500, 1000, 4353454]), dtype='u4')
buff = ctx.buffer(reserve=4 * 4)
vao = ctx.vertex_array(prog, [])
tex.use(0)
vao.transform(buff, vertices=4)
data = struct.unpack('4I', buff.read())
assert data[0] == 0
assert data[1] == 500
assert data[2] == 1000
assert data[3] == 4353454
def test_sampler_2d_array(ctx):
"""RGBA8 2d array sampler. Read two pixels from two different layers"""
prog = ctx.program(
vertex_shader="""
#version 330
uniform sampler2DArray tex;
out float color;
void main() {
color = texelFetch(tex, ivec3(gl_VertexID % 2, 0, gl_VertexID / 2), 0).r;
}
""",
varyings=['color'],
)
tex = ctx.texture_array((2, 1, 2), 1, data=array('B', [127, 0, 255, 64]), dtype='f1')
buff = ctx.buffer(reserve=4 * 4)
vao = ctx.vertex_array(prog, [])
tex.use(0)
vao.transform(buff, vertices=4)
data = struct.unpack('4f', buff.read())
assert pytest.approx(data[0], abs=1.0e-3) == 0.498
assert pytest.approx(data[1]) == 0.0
assert pytest.approx(data[2]) == 1.0
assert pytest.approx(data[3], abs=1.0e-3) == 0.25
def test_sampler_1d(ctx):
prog = ctx.program(
vertex_shader="""
#version 330
uniform sampler1D tex;
out vec4 color;
void main() {
color = texelFetch(tex, 0, 0);
}
""",
varyings=["color"],
)
assert "tex" in prog
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