Fixes dEQP-GLES31.functional.shaders.multisample_interpolation tests:
- interpolate_at_sample.non_multisample_buffer.sample_n_default_framebuffer
- interpolate_at_sample.non_multisample_buffer.sample_n_singlesample_rbo
- interpolate_at_sample.non_multisample_buffer.sample_n_singlesample_texture
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 8c9c322..ad793e6 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -2081,6 +2081,7 @@ fs_visitor::nir_emit_fs_intrinsic(const fs_builder &bld,
assert(stage == MESA_SHADER_FRAGMENT);
struct brw_wm_prog_data *wm_prog_data =
(struct brw_wm_prog_data *) prog_data;
+ const struct brw_wm_prog_key *wm_key = (const struct brw_wm_prog_key *) key;
fs_reg dest;
if (nir_intrinsic_infos[instr->intrinsic].has_dest)
@@ -2175,6 +2176,20 @@ fs_visitor::nir_emit_fs_intrinsic(const fs_builder &bld,
break;
case nir_intrinsic_interp_var_at_sample: {
+ if (!wm_key->multisample_fbo) {
+ /* From the ARB_gpu_shader5 specification:
+ * "If multisample buffers are not available, the input varying
+ * will be evaluated at the center of the pixel."
+ */
+ emit_pixel_interpolater_send(bld,
+ FS_OPCODE_INTERPOLATE_AT_CENTROID,
+ dst_xy,
+ fs_reg(), /* src */
+ brw_imm_ud(0u),
+ interpolation);
+ break;
+ }
+
nir_const_value *const_sample = nir_src_as_const_value(instr->src[0]);
if (const_sample) {
--
2.8.0
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