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# The spec requires sampler array indexing expressions to be
# dynamically uniform, as defined in section 3.8.3 of the GLSL 4.50
# specification:
#
# "A fragment-shader expression is dynamically uniform if all
# fragments evaluating it get the same resulting value. [...] This
# is similarly defined for other shader stages, based on the
# per-instance data they process."
#
# This however doesn't have any implications on the control flow that
# leads to the evaluation of that expression being uniform, so it's
# easy to get wrong. This test verifies that dynamically uniform
# sampler indexing expressions are evaluated correctly in the vertex
# shader under non-uniform control flow.
#
[require]
GLSL >= 1.50
GL_ARB_gpu_shader5
[vertex shader]
#version 150
#extension GL_ARB_gpu_shader5: require
uniform sampler2D s[4];
uniform uint n;
in vec4 vertex;
out vec4 color;
void main()
{
vec4 v = vec4(0);
if (int(round(10 * vertex.x)) % 2 != int(round(10 * vertex.y)) % 3) {
for (uint i = 0; i < 4; ++i)
v[i] = texture(s[(n + i) % 4u], vec2(0.5, 0.5)).x;
}
gl_Position = vec4(-1 + 1.0 / 250.0 + vertex.x * 2,
-1 + 1.0 / 250.0 + vertex.y * 2,
0, 1);
color = v;
}
[fragment shader]
#version 150
in vec4 color;
out vec4 out_color;
void main()
{
out_color = color;
}
[vertex data]
vertex/float/3
0.0 0.0 0.0
0.0 0.1 0.0
0.0 0.2 0.0
0.0 0.3 0.0
0.0 0.4 0.0
0.0 0.5 0.0
0.1 0.0 0.0
0.1 0.1 0.0
0.1 0.2 0.0
0.1 0.3 0.0
0.1 0.4 0.0
0.1 0.5 0.0
0.2 0.0 0.0
0.2 0.1 0.0
0.2 0.2 0.0
0.2 0.3 0.0
0.2 0.4 0.0
0.2 0.5 0.0
0.3 0.0 0.0
0.3 0.1 0.0
0.3 0.2 0.0
0.3 0.3 0.0
0.3 0.4 0.0
0.3 0.5 0.0
0.4 0.0 0.0
0.4 0.1 0.0
0.4 0.2 0.0
0.4 0.3 0.0
0.4 0.4 0.0
0.4 0.5 0.0
0.5 0.0 0.0
0.5 0.1 0.0
0.5 0.2 0.0
0.5 0.3 0.0
0.5 0.4 0.0
0.5 0.5 0.0
0.6 0.0 0.0
0.6 0.1 0.0
0.6 0.2 0.0
0.6 0.3 0.0
0.6 0.4 0.0
0.6 0.5 0.0
0.7 0.0 0.0
0.7 0.1 0.0
0.7 0.2 0.0
0.7 0.3 0.0
0.7 0.4 0.0
0.7 0.5 0.0
[test]
clear color 0.2 0.2 0.2 0.2
clear
uniform int s[0] 0
uniform int s[1] 1
uniform int s[2] 2
uniform int s[3] 3
texture checkerboard 0 0 (32, 32) (0.2, 0.0, 0.0, 0.0) (0.2, 0.0, 0.0, 0.0)
texparameter 2D min nearest
texparameter 2D mag nearest
texture checkerboard 1 0 (32, 32) (0.4, 0.0, 0.0, 0.0) (0.4, 0.0, 0.0, 0.0)
texparameter 2D min nearest
texparameter 2D mag nearest
texture checkerboard 2 0 (32, 32) (0.6, 0.0, 0.0, 0.0) (0.6, 0.0, 0.0, 0.0)
texparameter 2D min nearest
texparameter 2D mag nearest
texture checkerboard 3 0 (32, 32) (0.8, 0.0, 0.0, 0.0) (0.8, 0.0, 0.0, 0.0)
texparameter 2D min nearest
texparameter 2D mag nearest
uniform uint n 1
draw arrays GL_POINTS 0 48
# This is likely to give the expected result for some vertices even if
# the implementation doesn't take this possibility into account.
# Probe a bunch of pixels for good measure.
#
relative probe rgba (0.1, 0.0) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.3, 0.0) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.5, 0.0) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.7, 0.0) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.0, 0.1) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.2, 0.1) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.4, 0.1) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.6, 0.1) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.0, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.1, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.2, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.3, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.4, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.5, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.6, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.7, 0.2) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.1, 0.3) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.3, 0.3) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.5, 0.3) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.7, 0.3) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.0, 0.4) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.2, 0.4) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.4, 0.4) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.6, 0.4) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.0, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.1, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.2, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.3, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.4, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.5, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.6, 0.5) (0.4, 0.6, 0.8, 0.2)
relative probe rgba (0.7, 0.5) (0.4, 0.6, 0.8, 0.2)
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