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[require]
GL >= 3.3
GLSL >= 3.30
GL_ARB_shader_storage_buffer_object
GL_ARB_shader_atomic_counters
[vertex shader passthrough]
[fragment shader]
#version 330
#extension GL_ARB_shader_storage_buffer_object: require
#extension GL_ARB_shader_atomic_counters: require
layout(binding = 0, std430) buffer bufblock {
int array[64];
int value;
};
layout(binding = 0) uniform atomic_uint fail;
out vec4 color;
void main()
{
int x = int(gl_FragCoord.x);
int y = int(gl_FragCoord.y);
int local_index = y * array.length() + x;
int v;
/* For value, every instance should get 2147483647. */
v = atomicMax(value, local_index);
if (v != 2147483647)
atomicCounterIncrement(fail);
if (value != 2147483647)
atomicCounterIncrement(fail);
if (local_index < array.length()) {
int first_expected = (local_index + 1) * -4;
int second_expected = local_index * 4;
/* The per-instance value should give the old value on the
* first step. This is expected to be the negative byte
* offset of the next array element.
*/
v = atomicMax(array[local_index], second_expected);
if (v != first_expected)
atomicCounterIncrement(fail);
/* The per-instance value should give the new value on the
* second step. This is expected to be the byte offset of the
* current array element.
*/
v = atomicExchange(array[local_index], first_expected);
if (v != second_expected)
atomicCounterIncrement(fail);
color = vec4(0.0, 1.0, 0.0, 1.0);
} else {
color = vec4(0.0, 0.0, 1.0, 1.0);
}
}
[test]
atomic counters 1
ssbo 0 260
ssbo 0 subdata int 0 -4
ssbo 0 subdata int 4 -8
ssbo 0 subdata int 8 -12
ssbo 0 subdata int 12 -16
ssbo 0 subdata int 16 -20
ssbo 0 subdata int 20 -24
ssbo 0 subdata int 24 -28
ssbo 0 subdata int 28 -32
ssbo 0 subdata int 32 -36
ssbo 0 subdata int 36 -40
ssbo 0 subdata int 40 -44
ssbo 0 subdata int 44 -48
ssbo 0 subdata int 48 -52
ssbo 0 subdata int 52 -56
ssbo 0 subdata int 56 -60
ssbo 0 subdata int 60 -64
ssbo 0 subdata int 64 -68
ssbo 0 subdata int 68 -72
ssbo 0 subdata int 72 -76
ssbo 0 subdata int 76 -80
ssbo 0 subdata int 80 -84
ssbo 0 subdata int 84 -88
ssbo 0 subdata int 88 -92
ssbo 0 subdata int 92 -96
ssbo 0 subdata int 96 -100
ssbo 0 subdata int 100 -104
ssbo 0 subdata int 104 -108
ssbo 0 subdata int 108 -112
ssbo 0 subdata int 112 -116
ssbo 0 subdata int 116 -120
ssbo 0 subdata int 120 -124
ssbo 0 subdata int 124 -128
ssbo 0 subdata int 128 -132
ssbo 0 subdata int 132 -136
ssbo 0 subdata int 136 -140
ssbo 0 subdata int 140 -144
ssbo 0 subdata int 144 -148
ssbo 0 subdata int 148 -152
ssbo 0 subdata int 152 -156
ssbo 0 subdata int 156 -160
ssbo 0 subdata int 160 -164
ssbo 0 subdata int 164 -168
ssbo 0 subdata int 168 -172
ssbo 0 subdata int 172 -176
ssbo 0 subdata int 176 -180
ssbo 0 subdata int 180 -184
ssbo 0 subdata int 184 -188
ssbo 0 subdata int 188 -192
ssbo 0 subdata int 192 -196
ssbo 0 subdata int 196 -200
ssbo 0 subdata int 200 -204
ssbo 0 subdata int 204 -208
ssbo 0 subdata int 208 -212
ssbo 0 subdata int 212 -216
ssbo 0 subdata int 216 -220
ssbo 0 subdata int 220 -224
ssbo 0 subdata int 224 -228
ssbo 0 subdata int 228 -232
ssbo 0 subdata int 232 -236
ssbo 0 subdata int 236 -240
ssbo 0 subdata int 240 -244
ssbo 0 subdata int 244 -248
ssbo 0 subdata int 248 -252
ssbo 0 subdata int 252 -256
ssbo 0 subdata int 256 2147483647
clear color 0.5 0.5 0.5 0.5
clear
draw rect -1 -1 2 2
probe atomic counter 0 == 0
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