---
src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 89 ++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 2872b2d..f5f918d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -3155,6 +3155,95 @@ fs_visitor::nir_emit_gs_intrinsic(const fs_builder &bld,
}
}
+/**
+ * Fetch the current render target layer index.
+ */
+static fs_reg
+fetch_render_target_array_index(const fs_builder &bld)
+{
+ if (bld.shader->devinfo->gen >= 6) {
+ /* The render target array index is provided in the thread payload as
+ * bits 26:16 of r0.0.
+ */
+ const fs_reg idx = bld.vgrf(BRW_REGISTER_TYPE_UD);
+ bld.AND(idx, brw_uw1_reg(BRW_GENERAL_REGISTER_FILE, 0, 1),
+ brw_imm_uw(0x7ff));
+ return idx;
+ } else {
+ /* Pre-SNB we only ever render into the first layer of the framebuffer
+ * since layered rendering is not implemented.
+ */
+ return brw_imm_ud(0);
+ }
+}
+
+/**
+ * Fake non-coherent framebuffer read implemented using TXF to fetch from the
+ * framebuffer at the current fragment coordinates and sample index.
+ */
+static fs_inst *
+emit_non_coherent_fb_read(fs_visitor *v, const fs_reg &dst, unsigned target)
+{
+ const fs_builder &bld = v->bld;
+ const struct brw_device_info *devinfo = bld.shader->devinfo;
+
+ assert(bld.shader->stage == MESA_SHADER_FRAGMENT);
+ const brw_wm_prog_key *wm_key =
+ reinterpret_cast<const brw_wm_prog_key *>(v->key);
+ assert(!wm_key->coherent_fb_fetch);
+ const brw_wm_prog_data *wm_prog_data =
+ reinterpret_cast<const brw_wm_prog_data *>(bld.shader->stage_prog_data);
+
+ /* Calculate the surface index relative to the start of the texture binding
+ * table block, since that's what the texturing messages expect.
+ */
+ const unsigned surface = target +
+ wm_prog_data->binding_table.render_target_read_start -
+ wm_prog_data->base.binding_table.texture_start;
+
+ brw_mark_surface_used(
+ bld.shader->stage_prog_data,
+ wm_prog_data->binding_table.render_target_read_start + target);
+
+ /* Calculate the fragment coordinates. */
+ const fs_reg coords = bld.vgrf(BRW_REGISTER_TYPE_UD, 3);
+ bld.MOV(offset(coords, bld, 0), v->pixel_x);
+ bld.MOV(offset(coords, bld, 1), v->pixel_y);
+ bld.MOV(offset(coords, bld, 2), fetch_render_target_array_index(bld));
+
+ /* Calculate the sample index and MCS payload when multisampling. Luckily
+ * the MCS fetch message behaves deterministically for UMS surfaces, so it
+ * shouldn't be necessary to recompile based on whether the framebuffer is
+ * CMS or UMS.
+ */
+ const fs_reg sample = wm_key->multisample_fbo ?
+ *v->emit_sampleid_setup() : fs_reg();
+ const fs_reg mcs = wm_key->multisample_fbo ?
+ v->emit_mcs_fetch(coords, 3, brw_imm_ud(surface)) : fs_reg();
+
+ /* Use either a normal or a CMS texel fetch message depending on whether
+ * the framebuffer is single or multisample. On SKL+ use the wide CMS
+ * message just in case the framebuffer uses 16x multisampling, it should
+ * be equivalent to the normal CMS fetch for lower multisampling modes.
+ */
+ const opcode op = (!wm_key->multisample_fbo ? SHADER_OPCODE_TXF_LOGICAL :
+ devinfo->gen >= 9 ? SHADER_OPCODE_TXF_CMS_W_LOGICAL :
+ SHADER_OPCODE_TXF_CMS_LOGICAL);
+
+ /* Emit the instruction. */
+ const fs_reg srcs[] = { coords, fs_reg(), brw_imm_ud(0), fs_reg(),
+ sample, mcs,
+ brw_imm_ud(surface), brw_imm_ud(0),
+ fs_reg(), brw_imm_ud(3), brw_imm_ud(0) };
+ STATIC_ASSERT(ARRAY_SIZE(srcs) == TEX_LOGICAL_NUM_SRCS);
+
+ fs_inst *inst = bld.emit(op, dst, srcs, ARRAY_SIZE(srcs));
+ inst->regs_written = 4 * inst->dst.component_size(inst->exec_size) /
+ REG_SIZE;
+
+ return inst;
+}
+
void
fs_visitor::nir_emit_fs_intrinsic(const fs_builder &bld,
nir_intrinsic_instr *instr)
--
2.9.0
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