Attachment 139956 Details for Bug 106774 – Test case that exhibits the issue

Test case that exhibits the issue

ssbo-atomicCompSwap-int.shader_test (text/plain), 1.86 KB, created by Ian Romanick on 2018-06-01 20:34:42 UTC

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Creator: Ian Romanick

Created: 2018-06-01 20:34:42 UTC

Size: 1.86 KB

patch

obsolete

>[require]
>GL >= 3.3
>GLSL >= 3.30
>GL_ARB_shader_storage_buffer_object
>GL_ARB_shader_atomic_counters
>GL_ARB_shader_atomic_counter_ops
>
>[vertex shader passthrough]
>
>[fragment shader]
>#extension GL_ARB_shader_storage_buffer_object: require
>#extension GL_ARB_shader_atomic_counters: require
>#extension GL_ARB_shader_atomic_counter_ops: require
>
>layout(binding = 0) buffer bufblock {
>	int value;
>};
>
>/* GL_ARB_shader_atomic_counters requires at least 8 total counters. */
>layout(binding = 0) uniform atomic_uint mask[7];
>layout(binding = 0) uniform atomic_uint fail;
>
>out vec4 color;
>
>void main()
>{
>	/* Each of 32 * N fragments should see a unique value.  Each value
>	 * observed is tracked in "mask."  The test automatically fails if a
>	 * duplicate value is observed.  After the shaders are done running,
>	 * the mask values will be probed to ensure that all possible values
>	 * were observed.
>	 */
>	int f;
>
>	/* This is an open-coded atomicAdd. */
>//#define GPU_HANG_I965
>#ifdef GPU_HANG_I965
>	do {
>		f = value;
>	} while (f != atomicCompSwap(value, f, f + 4));
>#else
>	f = value;
>	int a;
>	do {
>		a = f;
>	} while ((f = atomicCompSwap(value, f, f + 4)) != a);
>#endif
>
>	uint i = uint(f) / 4u;
>	uint bit = i % 32u;
>	int c = int(i / 32u);
>	uint m = 1u << bit;
>
>	if (c < mask.length()) {
>		/* If the bit was already set, the test fails. */
>		if ((atomicCounterOrARB(mask[c], m) & m) != 0u)
>			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 8
>
>ssbo 0 32
>ssbo 0 subdata float 0 0.0
>
>clear color 0.5 0.5 0.5 0.5
>clear
>
>draw rect -1 -1 2 2
>
>probe atomic counter 0 == 4294967295
>probe atomic counter 1 == 4294967295
>probe atomic counter 2 == 4294967295
>probe atomic counter 3 == 4294967295
>probe atomic counter 4 == 4294967295
>probe atomic counter 5 == 4294967295
>probe atomic counter 6 == 4294967295
>probe atomic counter 7 == 0

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