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nir/types: Add a natural size and alignment helper

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The size and alignment are "natural" in the sense that everything is
aligned to a scalar.  This is a bit tighter than std430 where vec3s are
required to be aligned to a vec4.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2018-06-29 14:14:52 -07:00
parent 893fc2d07d
commit 2bf8be99b0
2 changed files with 62 additions and 0 deletions
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56
src/compiler/nir_types.cpp
View file

@ -477,3 +477,59 @@ glsl_channel_type(const glsl_type *t)
unreachable("Unhandled base type glsl_channel_type()");
}
}
void
glsl_get_natural_size_align_bytes(const struct glsl_type *type,
unsigned *size, unsigned *align)
{
switch (type->base_type) {
case GLSL_TYPE_UINT8:
case GLSL_TYPE_INT8:
case GLSL_TYPE_UINT16:
case GLSL_TYPE_INT16:
case GLSL_TYPE_FLOAT16:
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
case GLSL_TYPE_DOUBLE:
case GLSL_TYPE_UINT64:
case GLSL_TYPE_INT64: {
unsigned N = glsl_get_bit_size(type) / 8;
*size = N * type->components();
*align = N;
break;
}
case GLSL_TYPE_ARRAY: {
unsigned elem_size, elem_align;
glsl_get_natural_size_align_bytes(type->fields.array,
&elem_size, &elem_align);
*align = elem_align;
*size = type->length * ALIGN_POT(elem_size, elem_align);
break;
}
case GLSL_TYPE_STRUCT:
*size = 0;
*align = 0;
for (unsigned i = 0; i < type->length; i++) {
unsigned elem_size, elem_align;
glsl_get_natural_size_align_bytes(type->fields.structure[i].type,
&elem_size, &elem_align);
*align = MAX2(*align, elem_align);
*size = ALIGN_POT(*size, elem_align) + elem_size;
}
break;
case GLSL_TYPE_SAMPLER:
case GLSL_TYPE_ATOMIC_UINT:
case GLSL_TYPE_SUBROUTINE:
case GLSL_TYPE_IMAGE:
case GLSL_TYPE_VOID:
case GLSL_TYPE_ERROR:
case GLSL_TYPE_INTERFACE:
case GLSL_TYPE_FUNCTION:
unreachable("type does not have a natural size");
}
}

6
src/compiler/nir_types.h
View file

@ -184,6 +184,12 @@ const struct glsl_type *glsl_transposed_type(const struct glsl_type *type);
const struct glsl_type *glsl_channel_type(const struct glsl_type *type);
typedef void (*glsl_type_size_align_func)(const struct glsl_type *type,
unsigned *size, unsigned *align);
void glsl_get_natural_size_align_bytes(const struct glsl_type *type,
unsigned *size, unsigned *align);
#ifdef __cplusplus
}
#endif