Mesa (master): i965/fs: Add support for non-shadow textureGrad (TXD) on gen5/6.
Kenneth Graunke
kwg at kemper.freedesktop.org
Sun Jun 19 00:54:25 UTC 2011
Module: Mesa
Branch: master
Commit: 2f4a4b943f1cad9bbbb8f66c34dca506503ba5bb
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2f4a4b943f1cad9bbbb8f66c34dca506503ba5bb
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Wed Jun 8 16:06:49 2011 -0700
i965/fs: Add support for non-shadow textureGrad (TXD) on gen5/6.
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 32 +++++++++++++++++++++++++-
1 files changed, 31 insertions(+), 1 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 7255946..638eaa4 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -742,7 +742,37 @@ fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
inst = emit(FS_OPCODE_TXL, dst);
break;
- case ir_txd:
+ case ir_txd: {
+ ir->lod_info.grad.dPdx->accept(this);
+ fs_reg dPdx = this->result;
+
+ ir->lod_info.grad.dPdy->accept(this);
+ fs_reg dPdy = this->result;
+
+ mlen = MAX2(mlen, header_present + 4 * reg_width); /* skip over 'ai' */
+
+ /**
+ * P = u, v, r
+ * dPdx = dudx, dvdx, drdx
+ * dPdy = dudy, dvdy, drdy
+ *
+ * Load up these values:
+ * - dudx dudy dvdx dvdy drdx drdy
+ * - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z
+ */
+ for (int i = 0; i < ir->lod_info.grad.dPdx->type->vector_elements; i++) {
+ emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx);
+ dPdx.reg_offset++;
+ mlen += reg_width;
+
+ emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy);
+ dPdy.reg_offset++;
+ mlen += reg_width;
+ }
+
+ inst = emit(FS_OPCODE_TXD, dst);
+ break;
+ }
case ir_txf:
assert(!"GLSL 1.30 features unsupported");
break;
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