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nir: add doubles component packing support

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This makes sure we give the correct driver location
for doubles when using component packing. Specifically
it handles packing a dvec3 with a double which is the
only packing scenario allowed which spans across two
locations.

Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
This commit is contained in:
Timothy Arceri 2016-07-19 15:40:14 +10:00
parent ad5dd39984
commit cba6657d8b
1 changed files with 20 additions and 0 deletions
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20
src/compiler/nir/nir_lower_io.c
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@ -74,6 +74,26 @@ nir_assign_var_locations(struct exec_list *var_list, unsigned *size,
if (locations[idx][var->data.index] == -1) {
var->data.driver_location = location;
locations[idx][var->data.index] = location;
/* A dvec3 can be packed with a double we need special handling
* for this as we are packing across two locations.
*/
if (glsl_get_base_type(var->type) == GLSL_TYPE_DOUBLE &&
glsl_get_vector_elements(var->type) == 3) {
/* Hack around type_size functions that expect vectors to be
* padded out to vec4. If a float type is the same size as a
* double then the type size is padded to vec4, otherwise
* set the offset to two doubles which offsets the location
* past the first two components in dvec3 which were stored at
* the previous location.
*/
unsigned dsize = type_size(glsl_double_type());
unsigned offset =
dsize == type_size(glsl_float_type()) ? dsize : dsize * 2;
locations[idx + 1][var->data.index] = location + offset;
}
location += type_size(var->type);
} else {
var->data.driver_location = locations[idx][var->data.index];