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i965/fs: fix FS_OPCODE_CINTERP for unpacked double input varyings

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Data starts at suboffet 3 in 32-bit units (12 bytes), so it is not
64-bit aligned and the current implementation fails to read the data
properly. Instead, when there is is a double input varying, read it as
vector of floats with twice the number of components.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit cb30727648)
This commit is contained in:
Samuel Iglesias Gonsálvez 2016-05-26 07:56:38 +02:00 • committed by Emil Velikov
parent fc0a469e4c
commit 4daa331e25
1 changed files with 12 additions and 1 deletions
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13
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -1189,7 +1189,18 @@ fs_visitor::emit_general_interpolation(fs_reg *attr, const char *name,
* handed us defined values in only the constant offset
* field of the setup reg.
*/
for (unsigned int i = 0; i < type->vector_elements; i++) {
unsigned vector_elements = type->vector_elements;
/* Data starts at suboffet 3 in 32-bit units (12 bytes), so it is not
* 64-bit aligned and the current implementation fails to read the
* data properly. Instead, when there is is a double input varying,
* read it as vector of floats with twice the number of components.
*/
if (attr->type == BRW_REGISTER_TYPE_DF) {
vector_elements *= 2;
attr->type = BRW_REGISTER_TYPE_F;
}
for (unsigned int i = 0; i < vector_elements; i++) {
struct brw_reg interp = interp_reg(*location, i);
interp = suboffset(interp, 3);
interp.type = attr->type;