Hi Juan,
Am 18.05.2016 um 13:19 schrieb Juan A. Suarez Romero:
> From the GL 4.5 core spec, section 11.1.1 (Vertex Attributes):
>
> "A program with more than the value of MAX_VERTEX_ATTRIBS
> active attribute variables may fail to link, unless
> device-dependent optimizations are able to make the program
> fit within available hardware resources. For the purposes
> of this test, attribute variables of the type dvec3, dvec4,
> dmat2x3, dmat2x4, dmat3, dmat3x4, dmat4x3, and dmat4 may
> count as consuming twice as many attributes as equivalent
> single-precision types. While these types use the same number
> of generic attributes as their single-precision equivalents,
> implementations are permitted to consume two single-precision
> vectors of internal storage for each three- or four-component
> double-precision vector."
>
> This commits makes dvec3, dvec4, dmat2x3, dmat2x4, dmat3, dmat3x4,
> dmat4x3 and dmat4 consume twice as many attributes as equivalent
> single-precision types.
>
> v3: count doubles as consuming two attributes (Dave Airlie)
>
> Signed-off-by: Antia Puentes <apuen...@igalia.com>
> Signed-off-by: Juan A. Suarez Romero <jasua...@igalia.com>
> ---
> src/compiler/glsl/linker.cpp | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
> index f208d19..ad96a63 100644
> --- a/src/compiler/glsl/linker.cpp
> +++ b/src/compiler/glsl/linker.cpp
> @@ -2873,6 +2873,25 @@ assign_attribute_or_color_locations(gl_shader_program
> *prog,
> to_assign[i].var->data.location = generic_base + location;
> to_assign[i].var->data.is_unmatched_generic_inout = 0;
> used_locations |= (use_mask << location);
> +
> + if (to_assign[i].var->type->without_array()->is_dual_slot_double())
> + double_storage_locations |= (use_mask << location);
> + }
> +
> + /* Now that we have all the locations, take in account that dvec3/4 can
> + * require twice the space of single-precision vectors. Check if we run
> out
> + * of attribute slots.
> + */
Would you mind citing the spec section from the commit message here
(only reference not the text)?
--Michael
> + if (target_index == MESA_SHADER_VERTEX) {
> + unsigned total_attribs_size =
> + _mesa_bitcount(used_locations & ((1 << max_index) - 1)) +
> + _mesa_bitcount(double_storage_locations);
> + if (total_attribs_size > max_index) {
> + linker_error(prog,
> + "attempt to use %d vertex attribute slots only %d
> available ",
> + total_attribs_size, max_index);
> + return false;
> + }
> }
>
> return true;
>
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