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# Simple test of atomicCounterIncrement, atomicCounterDecrement and
# atomicCounter being used in the VS.
[require]
GLSL >= 1.40
GL_ARB_shader_atomic_counters
INT GL_MAX_VERTEX_ATOMIC_COUNTER_BUFFERS >= 2
[vertex shader]
#version 140
#extension GL_ARB_shader_atomic_counters: require
layout(binding = 0) uniform atomic_uint a0;
layout(binding = 0) uniform atomic_uint a1;
in vec4 piglit_vertex;
out vec4 vcolor;
void main()
{
bool passed = true;
uint v0, v1;
/* Test that incrementing, followed by a read of an atomic
* counter results in a larger value.
*
* Note: atomicCounterIncrement return the old value
*/
v0 = atomicCounterIncrement(a0);
v1 = atomicCounter(a0);
if (v1 <= v0)
passed = false;
/* Skip one decrement since it may be the 0 => 0xffffffff
* transition.
*/
atomicCounterDecrement(a1);
/* Test that a read, followed by a decrement of an atomic
* counter results in a smaller value.
*
* Note: atomicCounterDecrement return the new value
*/
v0 = atomicCounter(a1);
v1 = atomicCounterDecrement(a1);
if (v1 >= v0)
passed = false;
if (passed)
vcolor = vec4(0.0, 1.0, 0.0, 1.0);
else
vcolor = vec4(1.0, 0.0, 0.0, 1.0);
gl_Position = piglit_vertex;
}
[fragment shader]
#version 140
in vec4 vcolor;
out vec4 fcolor;
void main()
{
fcolor = vcolor;
}
[test]
atomic counters 2
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
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