From GL_ARB_shader_storage_buffer_object spec:
(3) Do we allow arrays of shader storage blocks?
RESOLVED: Yes; we already allow arrays of uniform blocks, where each
block instance has an identical layout but is backed by a separate
buffer object. It seems like we should do this here for consistency.
If we had overloaded the existing uniform block APIs (e.g., by applying
a "readwrite" layout qualifier to uniform blocks), it would be really
weird if we disallowed arrays of writeable uniform blocks since we
already allow it for regular (read-only) uniform blocks.
If they're trying to be identical to UBO's, then dynamic indexing is
allowed. I guess this is just an ES 3.10 restriction.
On Thu, Oct 1, 2015 at 7:54 AM, Tapani Pälli <tapani.pa...@intel.com> wrote:
> Signed-off-by: Tapani Pälli <tapani.pa...@intel.com>
> ---
> ...hader-storage-block-array-dynamic-indexing.frag | 24
> ++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
> create mode 100644
> tests/spec/arb_shader_storage_buffer_object/compiler/shader-storage-block-array-dynamic-indexing.frag
>
> diff --git
> a/tests/spec/arb_shader_storage_buffer_object/compiler/shader-storage-block-array-dynamic-indexing.frag
>
> b/tests/spec/arb_shader_storage_buffer_object/compiler/shader-storage-block-array-dynamic-indexing.frag
> new file mode 100644
> index 0000000..a05e7fc
> --- /dev/null
> +++
> b/tests/spec/arb_shader_storage_buffer_object/compiler/shader-storage-block-array-dynamic-indexing.frag
> @@ -0,0 +1,24 @@
> +// [config]
> +// expect_result: fail
> +// glsl_version: 1.50
> +// require_extensions: GL_ARB_shader_storage_buffer_object
> +// [end config]
> +
> +#version 150
> +#extension GL_ARB_shader_storage_buffer_object: require
> +
> +/* Page 50 in section 4.3.9 of the OpenGL ES 3.10 spec says:
> + *
> + * "All indices used to index a uniform or shader storage block
> + * array must be constant integral expressions."
> + */
> +
> +buffer buf {
> + vec4 v;
> +} array[2];
> +
> +uniform int index;
> +
> +vec4 foo(void) {
> + return array[index].v;
> +}
> --
> 2.4.3
>
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