[Mesa-dev] [PATCH] util: add u_lowering
Rob Clark
robdclark at gmail.com
Tue Sep 30 14:38:51 PDT 2014
From: Rob Clark <robclark at freedesktop.org>
TGSI->TGSI pass, extracted from freedreno. Currently provides the
following lower support, to help drivers emulate unsupported opcodes
or features:
Individual opcodes:
DST, XPD, SCS, LRP, FRC, POW, LIT, EXP, LOG, DP4, DP3, DPH,
DP2, DP2A
Also supported, although it is up to the driver to manage it's own
shader variants:
+ two-sided-color
+ texture coord saturate (ie. to emulate GL_CLAMP)
All of the lowering operations are opt-in so a driver can pick and
choose what it wants.
Signed-off-by: Rob Clark <robclark at freedesktop.org>
---
src/gallium/auxiliary/Makefile.sources | 1 +
src/gallium/auxiliary/util/u_lowering.c | 1571 +++++++++++++++++++++++++++++++
src/gallium/auxiliary/util/u_lowering.h | 87 ++
3 files changed, 1659 insertions(+)
create mode 100644 src/gallium/auxiliary/util/u_lowering.c
create mode 100644 src/gallium/auxiliary/util/u_lowering.h
diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 58d8af7..575c315 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -125,6 +125,7 @@ C_SOURCES := \
util/u_keymap.c \
util/u_linear.c \
util/u_linkage.c \
+ util/u_lowering.c \
util/u_network.c \
util/u_math.c \
util/u_mm.c \
diff --git a/src/gallium/auxiliary/util/u_lowering.c b/src/gallium/auxiliary/util/u_lowering.c
new file mode 100644
index 0000000..fd193bc
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_lowering.c
@@ -0,0 +1,1571 @@
+/*
+ * Copyright (C) 2014 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ * Rob Clark <robclark at freedesktop.org>
+ */
+
+#include "tgsi/tgsi_transform.h"
+#include "tgsi/tgsi_scan.h"
+#include "tgsi/tgsi_dump.h"
+
+#include "util/u_debug.h"
+#include "util/u_math.h"
+#include "util/u_lowering.h"
+
+struct u_lowering_context {
+ struct tgsi_transform_context base;
+ const struct u_lowering_config *config;
+ struct tgsi_shader_info *info;
+ unsigned two_side_colors;
+ unsigned two_side_idx[PIPE_MAX_SHADER_INPUTS];
+ unsigned color_base; /* base register for chosen COLOR/BCOLOR's */
+ int face_idx;
+ unsigned numtmp;
+ struct {
+ struct tgsi_full_src_register src;
+ struct tgsi_full_dst_register dst;
+ } tmp[2];
+#define A 0
+#define B 1
+ struct tgsi_full_src_register imm;
+ int emitted_decls;
+ unsigned saturate;
+};
+
+static inline struct u_lowering_context *
+u_lowering_context(struct tgsi_transform_context *tctx)
+{
+ return (struct u_lowering_context *) tctx;
+}
+
+/*
+ * Utility helpers:
+ */
+
+static void
+reg_dst(struct tgsi_full_dst_register *dst,
+ const struct tgsi_full_dst_register *orig_dst, unsigned wrmask)
+{
+ *dst = *orig_dst;
+ dst->Register.WriteMask &= wrmask;
+ assert(dst->Register.WriteMask);
+}
+
+static inline void
+get_swiz(unsigned *swiz, const struct tgsi_src_register *src)
+{
+ swiz[0] = src->SwizzleX;
+ swiz[1] = src->SwizzleY;
+ swiz[2] = src->SwizzleZ;
+ swiz[3] = src->SwizzleW;
+}
+
+static void
+reg_src(struct tgsi_full_src_register *src,
+ const struct tgsi_full_src_register *orig_src,
+ unsigned sx, unsigned sy, unsigned sz, unsigned sw)
+{
+ unsigned swiz[4];
+ get_swiz(swiz, &orig_src->Register);
+ *src = *orig_src;
+ src->Register.SwizzleX = swiz[sx];
+ src->Register.SwizzleY = swiz[sy];
+ src->Register.SwizzleZ = swiz[sz];
+ src->Register.SwizzleW = swiz[sw];
+}
+
+#define TGSI_SWIZZLE__ TGSI_SWIZZLE_X /* don't-care value! */
+#define SWIZ(x,y,z,w) TGSI_SWIZZLE_ ## x, TGSI_SWIZZLE_ ## y, \
+ TGSI_SWIZZLE_ ## z, TGSI_SWIZZLE_ ## w
+
+/*
+ * if (dst.x aliases src.x) {
+ * MOV tmpA.x, src.x
+ * src = tmpA
+ * }
+ * COS dst.x, src.x
+ * SIN dst.y, src.x
+ * MOV dst.zw, imm{0.0, 1.0}
+ */
+static bool
+aliases(const struct tgsi_full_dst_register *dst, unsigned dst_mask,
+ const struct tgsi_full_src_register *src, unsigned src_mask)
+{
+ if ((dst->Register.File == src->Register.File) &&
+ (dst->Register.Index == src->Register.Index)) {
+ unsigned i, actual_mask = 0;
+ unsigned swiz[4];
+ get_swiz(swiz, &src->Register);
+ for (i = 0; i < 4; i++)
+ if (src_mask & (1 << i))
+ actual_mask |= (1 << swiz[i]);
+ if (actual_mask & dst_mask)
+ return true;
+ }
+ return false;
+}
+
+static void
+create_mov(struct tgsi_transform_context *tctx,
+ const struct tgsi_full_dst_register *dst,
+ const struct tgsi_full_src_register *src,
+ unsigned mask, unsigned saturate)
+{
+ struct tgsi_full_instruction new_inst;
+
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.Saturate = saturate;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, mask);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+}
+
+/* to help calculate # of tgsi tokens for a lowering.. we assume
+ * the worst case, ie. removed instructions don't have ADDR[] or
+ * anything which increases the # of tokens per src/dst and the
+ * inserted instructions do.
+ *
+ * OINST() - old instruction
+ * 1 : instruction itself
+ * 1 : dst
+ * 1 * nargs : srcN
+ *
+ * NINST() - new instruction
+ * 1 : instruction itself
+ * 2 : dst
+ * 2 * nargs : srcN
+ */
+
+#define OINST(nargs) (1 + 1 + 1 * (nargs))
+#define NINST(nargs) (1 + 2 + 2 * (nargs))
+
+/*
+ * Lowering Translators:
+ */
+
+/* DST - Distance Vector
+ * dst.x = 1.0
+ * dst.y = src0.y \times src1.y
+ * dst.z = src0.z
+ * dst.w = src1.w
+ *
+ * ; note: could be more clever and use just a single temp
+ * ; if I was clever enough to re-write the swizzles.
+ * ; needs: 2 tmp, imm{1.0}
+ * if (dst.y aliases src0.z) {
+ * MOV tmpA.yz, src0.yz
+ * src0 = tmpA
+ * }
+ * if (dst.yz aliases src1.w) {
+ * MOV tmpB.yw, src1.yw
+ * src1 = tmpB
+ * }
+ * MUL dst.y, src0.y, src1.y
+ * MOV dst.z, src0.z
+ * MOV dst.w, src1.w
+ * MOV dst.x, imm{1.0}
+ */
+#define DST_GROW (NINST(1) + NINST(1) + NINST(2) + NINST(1) + \
+ NINST(1) + NINST(1) - OINST(2))
+#define DST_TMP 2
+static void
+transform_dst(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src0 = &inst->Src[0];
+ struct tgsi_full_src_register *src1 = &inst->Src[1];
+ struct tgsi_full_instruction new_inst;
+
+ if (aliases(dst, TGSI_WRITEMASK_Y, src0, TGSI_WRITEMASK_Z)) {
+ create_mov(tctx, &ctx->tmp[A].dst, src0, TGSI_WRITEMASK_YZ, 0);
+ src0 = &ctx->tmp[A].src;
+ }
+
+ if (aliases(dst, TGSI_WRITEMASK_YZ, src1, TGSI_WRITEMASK_W)) {
+ create_mov(tctx, &ctx->tmp[B].dst, src1, TGSI_WRITEMASK_YW, 0);
+ src1 = &ctx->tmp[B].src;
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Y) {
+ /* MUL dst.y, src0.y, src1.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src0, SWIZ(_, Y, _, _));
+ reg_src(&new_inst.Src[1], src1, SWIZ(_, Y, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Z) {
+ /* MOV dst.z, src0.z */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Z);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src0, SWIZ(_, _, Z, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_W) {
+ /* MOV dst.w, src1.w */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_W);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src1, SWIZ(_, _, _, W));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_X) {
+ /* MOV dst.x, imm{1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(Y, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* XPD - Cross Product
+ * dst.x = src0.y \times src1.z - src1.y \times src0.z
+ * dst.y = src0.z \times src1.x - src1.z \times src0.x
+ * dst.z = src0.x \times src1.y - src1.x \times src0.y
+ * dst.w = 1.0
+ *
+ * ; needs: 2 tmp, imm{1.0}
+ * MUL tmpA.xyz, src0.yzx, src1.zxy
+ * MUL tmpB.xyz, src1.yzx, src0.zxy
+ * SUB dst.xyz, tmpA.xyz, tmpB.xyz
+ * MOV dst.w, imm{1.0}
+ */
+#define XPD_GROW (NINST(2) + NINST(2) + NINST(2) + NINST(1) - OINST(2))
+#define XPD_TMP 2
+static void
+transform_xpd(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src0 = &inst->Src[0];
+ struct tgsi_full_src_register *src1 = &inst->Src[1];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZ) {
+ /* MUL tmpA.xyz, src0.yzx, src1.zxy */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZ);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src0, SWIZ(Y, Z, X, _));
+ reg_src(&new_inst.Src[1], src1, SWIZ(Z, X, Y, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL tmpB.xyz, src1.yzx, src0.zxy */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[B].dst, TGSI_WRITEMASK_XYZ);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src1, SWIZ(Y, Z, X, _));
+ reg_src(&new_inst.Src[1], src0, SWIZ(Z, X, Y, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* SUB dst.xyz, tmpA.xyz, tmpB.xyz */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_SUB;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZ);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(X, Y, Z, _));
+ reg_src(&new_inst.Src[1], &ctx->tmp[B].src, SWIZ(X, Y, Z, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_W) {
+ /* MOV dst.w, imm{1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_W);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(_, _, _, Y));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* SCS - Sine Cosine
+ * dst.x = \cos{src.x}
+ * dst.y = \sin{src.x}
+ * dst.z = 0.0
+ * dst.w = 1.0
+ *
+ * ; needs: 1 tmp, imm{0.0, 1.0}
+ * if (dst.x aliases src.x) {
+ * MOV tmpA.x, src.x
+ * src = tmpA
+ * }
+ * COS dst.x, src.x
+ * SIN dst.y, src.x
+ * MOV dst.zw, imm{0.0, 1.0}
+ */
+#define SCS_GROW (NINST(1) + NINST(1) + NINST(1) + NINST(1) - OINST(1))
+#define SCS_TMP 1
+static void
+transform_scs(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src = &inst->Src[0];
+ struct tgsi_full_instruction new_inst;
+
+ if (aliases(dst, TGSI_WRITEMASK_X, src, TGSI_WRITEMASK_X)) {
+ create_mov(tctx, &ctx->tmp[A].dst, src, TGSI_WRITEMASK_X, 0);
+ src = &ctx->tmp[A].src;
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_X) {
+ /* COS dst.x, src.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_COS;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Y) {
+ /* SIN dst.y, src.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_SIN;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_ZW) {
+ /* MOV dst.zw, imm{0.0, 1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_ZW);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(_, _, X, Y));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* LRP - Linear Interpolate
+ * dst.x = src0.x \times src1.x + (1.0 - src0.x) \times src2.x
+ * dst.y = src0.y \times src1.y + (1.0 - src0.y) \times src2.y
+ * dst.z = src0.z \times src1.z + (1.0 - src0.z) \times src2.z
+ * dst.w = src0.w \times src1.w + (1.0 - src0.w) \times src2.w
+ *
+ * ; needs: 2 tmp, imm{1.0}
+ * MUL tmpA, src0, src1
+ * SUB tmpB, imm{1.0}, src0
+ * MUL tmpB, tmpB, src2
+ * ADD dst, tmpA, tmpB
+ */
+#define LRP_GROW (NINST(2) + NINST(2) + NINST(2) + NINST(2) - OINST(3))
+#define LRP_TMP 2
+static void
+transform_lrp(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src0 = &inst->Src[0];
+ struct tgsi_full_src_register *src1 = &inst->Src[1];
+ struct tgsi_full_src_register *src2 = &inst->Src[2];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZW) {
+ /* MUL tmpA, src0, src1 */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src0, SWIZ(X, Y, Z, W));
+ reg_src(&new_inst.Src[1], src1, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* SUB tmpB, imm{1.0}, src0 */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_SUB;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[B].dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(Y, Y, Y, Y));
+ reg_src(&new_inst.Src[1], src0, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL tmpB, tmpB, src2 */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[B].dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->tmp[B].src, SWIZ(X, Y, Z, W));
+ reg_src(&new_inst.Src[1], src2, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* ADD dst, tmpA, tmpB */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_ADD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(X, Y, Z, W));
+ reg_src(&new_inst.Src[1], &ctx->tmp[B].src, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* FRC - Fraction
+ * dst.x = src.x - \lfloor src.x\rfloor
+ * dst.y = src.y - \lfloor src.y\rfloor
+ * dst.z = src.z - \lfloor src.z\rfloor
+ * dst.w = src.w - \lfloor src.w\rfloor
+ *
+ * ; needs: 1 tmp
+ * FLR tmpA, src
+ * SUB dst, src, tmpA
+ */
+#define FRC_GROW (NINST(1) + NINST(2) - OINST(1))
+#define FRC_TMP 1
+static void
+transform_frc(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src = &inst->Src[0];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZW) {
+ /* FLR tmpA, src */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_FLR;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* SUB dst, src, tmpA */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_SUB;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, Y, Z, W));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, Y, Z, W));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* POW - Power
+ * dst.x = src0.x^{src1.x}
+ * dst.y = src0.x^{src1.x}
+ * dst.z = src0.x^{src1.x}
+ * dst.w = src0.x^{src1.x}
+ *
+ * ; needs: 1 tmp
+ * LG2 tmpA.x, src0.x
+ * MUL tmpA.x, src1.x, tmpA.x
+ * EX2 dst, tmpA.x
+ */
+#define POW_GROW (NINST(1) + NINST(2) + NINST(1) - OINST(2))
+#define POW_TMP 1
+static void
+transform_pow(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src0 = &inst->Src[0];
+ struct tgsi_full_src_register *src1 = &inst->Src[1];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZW) {
+ /* LG2 tmpA.x, src0.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_LG2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src0, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL tmpA.x, src1.x, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src1, SWIZ(X, _, _, _));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* EX2 dst, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_EX2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZW);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* LIT - Light Coefficients
+ * dst.x = 1.0
+ * dst.y = max(src.x, 0.0)
+ * dst.z = (src.x > 0.0) ? max(src.y, 0.0)^{clamp(src.w, -128.0, 128.0))} : 0
+ * dst.w = 1.0
+ *
+ * ; needs: 1 tmp, imm{0.0}, imm{1.0}, imm{128.0}
+ * MAX tmpA.xy, src.xy, imm{0.0}
+ * CLAMP tmpA.z, src.w, -imm{128.0}, imm{128.0}
+ * LG2 tmpA.y, tmpA.y
+ * MUL tmpA.y, tmpA.z, tmpA.y
+ * EX2 tmpA.y, tmpA.y
+ * CMP tmpA.y, -src.x, tmpA.y, imm{0.0}
+ * MOV dst.yz, tmpA.xy
+ * MOV dst.xw, imm{1.0}
+ */
+#define LIT_GROW (NINST(1) + NINST(3) + NINST(1) + NINST(2) + \
+ NINST(1) + NINST(3) + NINST(1) + NINST(1) - OINST(1))
+#define LIT_TMP 1
+static void
+transform_lit(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src = &inst->Src[0];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_YZ) {
+ /* MAX tmpA.xy, src.xy, imm{0.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MAX;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_XY);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, Y, _, _));
+ reg_src(&new_inst.Src[1], &ctx->imm, SWIZ(X, X, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* CLAMP tmpA.z, src.w, -imm{128.0}, imm{128.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_CLAMP;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Z);
+ new_inst.Instruction.NumSrcRegs = 3;
+ reg_src(&new_inst.Src[0], src, SWIZ(_, _, W, _));
+ reg_src(&new_inst.Src[1], &ctx->imm, SWIZ(_, _, Z, _));
+ new_inst.Src[1].Register.Negate = true;
+ reg_src(&new_inst.Src[2], &ctx->imm, SWIZ(_, _, Z, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* LG2 tmpA.y, tmpA.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_LG2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(Y, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL tmpA.y, tmpA.z, tmpA.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(_, Z, _, _));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(_, Y, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* EX2 tmpA.y, tmpA.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_EX2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(Y, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* CMP tmpA.y, -src.x, tmpA.y, imm{0.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_CMP;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 3;
+ reg_src(&new_inst.Src[0], src, SWIZ(_, X, _, _));
+ new_inst.Src[0].Register.Negate = true;
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(_, Y, _, _));
+ reg_src(&new_inst.Src[2], &ctx->imm, SWIZ(_, X, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MOV dst.yz, tmpA.xy */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_YZ);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(_, X, Y, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XW) {
+ /* MOV dst.xw, imm{1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XW);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(Y, _, _, Y));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* EXP - Approximate Exponential Base 2
+ * dst.x = 2^{\lfloor src.x\rfloor}
+ * dst.y = src.x - \lfloor src.x\rfloor
+ * dst.z = 2^{src.x}
+ * dst.w = 1.0
+ *
+ * ; needs: 1 tmp, imm{1.0}
+ * FLR tmpA.x, src.x
+ * EX2 tmpA.y, src.x
+ * SUB dst.y, src.x, tmpA.x
+ * EX2 dst.x, tmpA.x
+ * MOV dst.z, tmpA.y
+ * MOV dst.w, imm{1.0}
+ */
+#define EXP_GROW (NINST(1) + NINST(1) + NINST(2) + NINST(1) + \
+ NINST(1)+ NINST(1) - OINST(1))
+#define EXP_TMP 1
+static void
+transform_exp(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src = &inst->Src[0];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XY) {
+ /* FLR tmpA.x, src.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_FLR;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Z) {
+ /* EX2 tmpA.y, src.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_EX2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Y) {
+ /* SUB dst.y, src.x, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_SUB;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src, SWIZ(_, X, _, _));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(_, X, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_X) {
+ /* EX2 dst.x, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_EX2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Z) {
+ /* MOV dst.z, tmpA.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Z);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(_, _, Y, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_W) {
+ /* MOV dst.w, imm{1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_W);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(_, _, _, Y));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* LOG - Approximate Logarithm Base 2
+ * dst.x = \lfloor\log_2{|src.x|}\rfloor
+ * dst.y = \frac{|src.x|}{2^{\lfloor\log_2{|src.x|}\rfloor}}
+ * dst.z = \log_2{|src.x|}
+ * dst.w = 1.0
+ *
+ * ; needs: 1 tmp, imm{1.0}
+ * LG2 tmpA.x, |src.x|
+ * FLR tmpA.y, tmpA.x
+ * EX2 tmpA.z, tmpA.y
+ * RCP tmpA.z, tmpA.z
+ * MUL dst.y, |src.x|, tmpA.z
+ * MOV dst.xz, tmpA.yx
+ * MOV dst.w, imm{1.0}
+ */
+#define LOG_GROW (NINST(1) + NINST(1) + NINST(1) + NINST(1) + \
+ NINST(2) + NINST(1) + NINST(1) - OINST(1))
+#define LOG_TMP 1
+static void
+transform_log(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src = &inst->Src[0];
+ struct tgsi_full_instruction new_inst;
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZ) {
+ /* LG2 tmpA.x, |src.x| */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_LG2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], src, SWIZ(X, _, _, _));
+ new_inst.Src[0].Register.Absolute = true;
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XY) {
+ /* FLR tmpA.y, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_FLR;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(_, X, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_Y) {
+ /* EX2 tmpA.z, tmpA.y */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_EX2;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Z);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(Y, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* RCP tmpA.z, tmpA.z */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_RCP;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_Z);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(Z, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL dst.y, |src.x|, tmpA.z */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_Y);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src, SWIZ(_, X, _, _));
+ new_inst.Src[0].Register.Absolute = true;
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(_, Z, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XZ) {
+ /* MOV dst.xz, tmpA.yx */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XZ);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(Y, _, X, _));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_W) {
+ /* MOV dst.w, imm{1.0} */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_W);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->imm, SWIZ(_, _, _, Y));
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* DP4 - 4-component Dot Product
+ * dst = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src0.w \times src1.w
+ *
+ * DP3 - 3-component Dot Product
+ * dst = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z
+ *
+ * DPH - Homogeneous Dot Product
+ * dst = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src1.w
+ *
+ * DP2 - 2-component Dot Product
+ * dst = src0.x \times src1.x + src0.y \times src1.y
+ *
+ * DP2A - 2-component Dot Product And Add
+ * dst = src0.x \times src1.x + src0.y \times src1.y + src2.x
+ *
+ * NOTE: these are translated into sequence of MUL/MAD(/ADD) scalar
+ * operations, which is what you'd prefer for a ISA that is natively
+ * scalar. Probably a native vector ISA would at least already have
+ * DP4/DP3 instructions, but perhaps there is room for an alternative
+ * translation for DPH/DP2/DP2A using vector instructions.
+ *
+ * ; needs: 1 tmp
+ * MUL tmpA.x, src0.x, src1.x
+ * MAD tmpA.x, src0.y, src1.y, tmpA.x
+ * if (DPH || DP3 || DP4) {
+ * MAD tmpA.x, src0.z, src1.z, tmpA.x
+ * if (DPH) {
+ * ADD tmpA.x, src1.w, tmpA.x
+ * } else if (DP4) {
+ * MAD tmpA.x, src0.w, src1.w, tmpA.x
+ * }
+ * } else if (DP2A) {
+ * ADD tmpA.x, src2.x, tmpA.x
+ * }
+ * ; fixup last instruction to replicate into dst
+ */
+#define DP4_GROW (NINST(2) + NINST(3) + NINST(3) + NINST(3) - OINST(2))
+#define DP3_GROW (NINST(2) + NINST(3) + NINST(3) - OINST(2))
+#define DPH_GROW (NINST(2) + NINST(3) + NINST(3) + NINST(2) - OINST(2))
+#define DP2_GROW (NINST(2) + NINST(3) - OINST(2))
+#define DP2A_GROW (NINST(2) + NINST(3) + NINST(2) - OINST(3))
+#define DOTP_TMP 1
+static void
+transform_dotp(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_dst_register *dst = &inst->Dst[0];
+ struct tgsi_full_src_register *src0 = &inst->Src[0];
+ struct tgsi_full_src_register *src1 = &inst->Src[1];
+ struct tgsi_full_src_register *src2 = &inst->Src[2]; /* only DP2A */
+ struct tgsi_full_instruction new_inst;
+ unsigned opcode = inst->Instruction.Opcode;
+
+ /* NOTE: any potential last instruction must replicate src on all
+ * components (since it could be re-written to write to final dst)
+ */
+
+ if (dst->Register.WriteMask & TGSI_WRITEMASK_XYZW) {
+ /* MUL tmpA.x, src0.x, src1.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src0, SWIZ(X, _, _, _));
+ reg_src(&new_inst.Src[1], src1, SWIZ(X, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MAD tmpA.x, src0.y, src1.y, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MAD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 3;
+ reg_src(&new_inst.Src[0], src0, SWIZ(Y, Y, Y, Y));
+ reg_src(&new_inst.Src[1], src1, SWIZ(Y, Y, Y, Y));
+ reg_src(&new_inst.Src[2], &ctx->tmp[A].src, SWIZ(X, X, X, X));
+
+ if ((opcode == TGSI_OPCODE_DPH) ||
+ (opcode == TGSI_OPCODE_DP3) || (opcode == TGSI_OPCODE_DP4)) {
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MAD tmpA.x, src0.z, src1.z, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MAD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 3;
+ reg_src(&new_inst.Src[0], src0, SWIZ(Z, Z, Z, Z));
+ reg_src(&new_inst.Src[1], src1, SWIZ(Z, Z, Z, Z));
+ reg_src(&new_inst.Src[2], &ctx->tmp[A].src, SWIZ(X, X, X, X));
+
+ if (opcode == TGSI_OPCODE_DPH) {
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* ADD tmpA.x, src1.w, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_ADD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src1, SWIZ(W, W, W, W));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, X, X, X));
+ }
+ else if (opcode == TGSI_OPCODE_DP4) {
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MAD tmpA.x, src0.w, src1.w, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MAD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 3;
+ reg_src(&new_inst.Src[0], src0, SWIZ(W, W, W, W));
+ reg_src(&new_inst.Src[1], src1, SWIZ(W, W, W, W));
+ reg_src(&new_inst.Src[2], &ctx->tmp[A].src, SWIZ(X, X, X, X));
+ }
+ }
+ else if (opcode == TGSI_OPCODE_DP2A) {
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* ADD tmpA.x, src2.x, tmpA.x */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_ADD;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], src2, SWIZ(X, X, X, X));
+ reg_src(&new_inst.Src[1], &ctx->tmp[A].src, SWIZ(X, X, X, X));
+ }
+
+ /* fixup last instruction to write to dst: */
+ reg_dst(&new_inst.Dst[0], dst, TGSI_WRITEMASK_XYZW);
+
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+/* Inserts a MOV_SAT for the needed components of tex coord. Note that
+ * in the case of TXP, the clamping must happen *after* projection, so
+ * we need to lower TXP to TEX.
+ *
+ * MOV tmpA, src0
+ * if (opc == TXP) {
+ * ; do perspective division manually before clamping:
+ * RCP tmpB, tmpA.w
+ * MUL tmpB.<pmask>, tmpA, tmpB.xxxx
+ * opc = TEX;
+ * }
+ * MOV_SAT tmpA.<mask>, tmpA ; <mask> is the clamped s/t/r coords
+ * <opc> dst, tmpA, ...
+ */
+#define SAMP_GROW (NINST(1) + NINST(1) + NINST(2) + NINST(1))
+#define SAMP_TMP 2
+static int
+transform_samp(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_full_src_register *coord = &inst->Src[0];
+ struct tgsi_full_src_register *samp;
+ struct tgsi_full_instruction new_inst;
+ /* mask is clamped coords, pmask is all coords (for projection): */
+ unsigned mask = 0, pmask = 0, smask;
+ unsigned opcode = inst->Instruction.Opcode;
+
+ if (opcode == TGSI_OPCODE_TXB2) {
+ samp = &inst->Src[2];
+ }
+ else {
+ samp = &inst->Src[1];
+ }
+
+ /* convert sampler # to bitmask to test: */
+ smask = 1 << samp->Register.Index;
+
+ /* check if we actually need to lower this one: */
+ if (!(ctx->saturate & smask))
+ return -1;
+
+ /* figure out which coordinates need saturating:
+ * - RECT textures should not get saturated
+ * - array index coords should not get saturated
+ */
+ switch (inst->Texture.Texture) {
+ case TGSI_TEXTURE_3D:
+ case TGSI_TEXTURE_CUBE:
+ case TGSI_TEXTURE_CUBE_ARRAY:
+ case TGSI_TEXTURE_SHADOWCUBE:
+ case TGSI_TEXTURE_SHADOWCUBE_ARRAY:
+ if (ctx->config->saturate_r & smask)
+ mask |= TGSI_WRITEMASK_Z;
+ pmask |= TGSI_WRITEMASK_Z;
+ /* fallthrough */
+
+ case TGSI_TEXTURE_2D:
+ case TGSI_TEXTURE_2D_ARRAY:
+ case TGSI_TEXTURE_SHADOW2D:
+ case TGSI_TEXTURE_SHADOW2D_ARRAY:
+ case TGSI_TEXTURE_2D_MSAA:
+ case TGSI_TEXTURE_2D_ARRAY_MSAA:
+ if (ctx->config->saturate_t & smask)
+ mask |= TGSI_WRITEMASK_Y;
+ pmask |= TGSI_WRITEMASK_Y;
+ /* fallthrough */
+
+ case TGSI_TEXTURE_1D:
+ case TGSI_TEXTURE_1D_ARRAY:
+ case TGSI_TEXTURE_SHADOW1D:
+ case TGSI_TEXTURE_SHADOW1D_ARRAY:
+ if (ctx->config->saturate_s & smask)
+ mask |= TGSI_WRITEMASK_X;
+ pmask |= TGSI_WRITEMASK_X;
+ break;
+
+ /* TODO: I think we should ignore these?
+ case TGSI_TEXTURE_RECT:
+ case TGSI_TEXTURE_SHADOWRECT:
+ */
+ }
+
+ /* sanity check.. driver could be asking to saturate a non-
+ * existent coordinate component:
+ */
+ if (!mask)
+ return -1;
+
+ /* MOV tmpA, src0 */
+ create_mov(tctx, &ctx->tmp[A].dst, coord, TGSI_WRITEMASK_XYZW, 0);
+
+ /* This is a bit sad.. we need to clamp *after* the coords
+ * are projected, which means lowering TXP to TEX and doing
+ * the projection ourself. But since I haven't figured out
+ * how to make the lowering code deliver an electric shock
+ * to anyone using GL_CLAMP, we must do this instead:
+ */
+ if (opcode == TGSI_OPCODE_TXP) {
+ /* RCP tmpB.x tmpA.w */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_RCP;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[B].dst, TGSI_WRITEMASK_X);
+ new_inst.Instruction.NumSrcRegs = 1;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(W, _, _, _));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ /* MUL tmpA.mask, tmpA, tmpB.xxxx */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MUL;
+ new_inst.Instruction.NumDstRegs = 1;
+ reg_dst(&new_inst.Dst[0], &ctx->tmp[A].dst, pmask);
+ new_inst.Instruction.NumSrcRegs = 2;
+ reg_src(&new_inst.Src[0], &ctx->tmp[A].src, SWIZ(X, Y, Z, W));
+ reg_src(&new_inst.Src[1], &ctx->tmp[B].src, SWIZ(X, X, X, X));
+ tctx->emit_instruction(tctx, &new_inst);
+
+ opcode = TGSI_OPCODE_TEX;
+ }
+
+ /* MOV_SAT tmpA.<mask>, tmpA */
+ create_mov(tctx, &ctx->tmp[A].dst, &ctx->tmp[A].src, mask,
+ TGSI_SAT_ZERO_ONE);
+
+ /* modify the texture samp instruction to take fixed up coord: */
+ new_inst = *inst;
+ new_inst.Instruction.Opcode = opcode;
+ new_inst.Src[0] = ctx->tmp[A].src;
+ tctx->emit_instruction(tctx, &new_inst);
+
+ return 0;
+}
+
+/* Two-sided color emulation:
+ * For each COLOR input, create a corresponding BCOLOR input, plus
+ * CMP instruction to select front or back color based on FACE
+ */
+#define TWOSIDE_GROW(n) ( \
+ 2 + /* FACE */ \
+ ((n) * 2) + /* IN[] BCOLOR[n] */ \
+ ((n) * 1) + /* TEMP[] */ \
+ ((n) * NINST(3)) /* CMP instr */ \
+ )
+
+static void
+emit_twoside(struct tgsi_transform_context *tctx)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_shader_info *info = ctx->info;
+ struct tgsi_full_declaration decl;
+ struct tgsi_full_instruction new_inst;
+ unsigned inbase, tmpbase;
+ int i;
+
+ inbase = info->file_max[TGSI_FILE_INPUT] + 1;
+ tmpbase = info->file_max[TGSI_FILE_TEMPORARY] + 1;
+
+ /* additional inputs for BCOLOR's */
+ for (i = 0; i < ctx->two_side_colors; i++) {
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_INPUT;
+ decl.Declaration.Semantic = true;
+ decl.Range.First = decl.Range.Last = inbase + i;
+ decl.Semantic.Name = TGSI_SEMANTIC_BCOLOR;
+ decl.Semantic.Index = info->input_semantic_index[ctx->two_side_idx[i]];
+ tctx->emit_declaration(tctx, &decl);
+ }
+
+ /* additional input for FACE */
+ if (ctx->two_side_colors && (ctx->face_idx == -1)) {
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_INPUT;
+ decl.Declaration.Semantic = true;
+ decl.Range.First = decl.Range.Last = inbase + ctx->two_side_colors;
+ decl.Semantic.Name = TGSI_SEMANTIC_FACE;
+ decl.Semantic.Index = 0;
+ tctx->emit_declaration(tctx, &decl);
+
+ ctx->face_idx = decl.Range.First;
+ }
+
+ /* additional temps for COLOR/BCOLOR selection: */
+ for (i = 0; i < ctx->two_side_colors; i++) {
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_TEMPORARY;
+ decl.Range.First = decl.Range.Last = tmpbase + ctx->numtmp + i;
+ tctx->emit_declaration(tctx, &decl);
+ }
+
+ /* and finally additional instructions to select COLOR/BCOLOR: */
+ for (i = 0; i < ctx->two_side_colors; i++) {
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_CMP;
+
+ new_inst.Instruction.NumDstRegs = 1;
+ new_inst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
+ new_inst.Dst[0].Register.Index = tmpbase + ctx->numtmp + i;
+ new_inst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZW;
+
+ new_inst.Instruction.NumSrcRegs = 3;
+ new_inst.Src[0].Register.File = TGSI_FILE_INPUT;
+ new_inst.Src[0].Register.Index = ctx->face_idx;
+ new_inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
+ new_inst.Src[1].Register.File = TGSI_FILE_INPUT;
+ new_inst.Src[1].Register.Index = inbase + i;
+ new_inst.Src[1].Register.SwizzleX = TGSI_SWIZZLE_X;
+ new_inst.Src[1].Register.SwizzleY = TGSI_SWIZZLE_Y;
+ new_inst.Src[1].Register.SwizzleZ = TGSI_SWIZZLE_Z;
+ new_inst.Src[1].Register.SwizzleW = TGSI_SWIZZLE_W;
+ new_inst.Src[2].Register.File = TGSI_FILE_INPUT;
+ new_inst.Src[2].Register.Index = ctx->two_side_idx[i];
+ new_inst.Src[2].Register.SwizzleX = TGSI_SWIZZLE_X;
+ new_inst.Src[2].Register.SwizzleY = TGSI_SWIZZLE_Y;
+ new_inst.Src[2].Register.SwizzleZ = TGSI_SWIZZLE_Z;
+ new_inst.Src[2].Register.SwizzleW = TGSI_SWIZZLE_W;
+
+ tctx->emit_instruction(tctx, &new_inst);
+ }
+}
+
+static void
+emit_decls(struct tgsi_transform_context *tctx)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+ struct tgsi_shader_info *info = ctx->info;
+ struct tgsi_full_declaration decl;
+ struct tgsi_full_immediate immed;
+ unsigned tmpbase;
+ int i;
+
+ tmpbase = info->file_max[TGSI_FILE_TEMPORARY] + 1;
+
+ ctx->color_base = tmpbase + ctx->numtmp;
+
+ /* declare immediate: */
+ immed = tgsi_default_full_immediate();
+ immed.Immediate.NrTokens = 1 + 4; /* one for the token itself */
+ immed.u[0].Float = 0.0;
+ immed.u[1].Float = 1.0;
+ immed.u[2].Float = 128.0;
+ immed.u[3].Float = 0.0;
+ tctx->emit_immediate(tctx, &immed);
+
+ ctx->imm.Register.File = TGSI_FILE_IMMEDIATE;
+ ctx->imm.Register.Index = info->immediate_count;
+ ctx->imm.Register.SwizzleX = TGSI_SWIZZLE_X;
+ ctx->imm.Register.SwizzleY = TGSI_SWIZZLE_Y;
+ ctx->imm.Register.SwizzleZ = TGSI_SWIZZLE_Z;
+ ctx->imm.Register.SwizzleW = TGSI_SWIZZLE_W;
+
+ /* declare temp regs: */
+ for (i = 0; i < ctx->numtmp; i++) {
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_TEMPORARY;
+ decl.Range.First = decl.Range.Last = tmpbase + i;
+ tctx->emit_declaration(tctx, &decl);
+
+ ctx->tmp[i].src.Register.File = TGSI_FILE_TEMPORARY;
+ ctx->tmp[i].src.Register.Index = tmpbase + i;
+ ctx->tmp[i].src.Register.SwizzleX = TGSI_SWIZZLE_X;
+ ctx->tmp[i].src.Register.SwizzleY = TGSI_SWIZZLE_Y;
+ ctx->tmp[i].src.Register.SwizzleZ = TGSI_SWIZZLE_Z;
+ ctx->tmp[i].src.Register.SwizzleW = TGSI_SWIZZLE_W;
+
+ ctx->tmp[i].dst.Register.File = TGSI_FILE_TEMPORARY;
+ ctx->tmp[i].dst.Register.Index = tmpbase + i;
+ ctx->tmp[i].dst.Register.WriteMask = TGSI_WRITEMASK_XYZW;
+ }
+
+ if (ctx->two_side_colors)
+ emit_twoside(tctx);
+}
+
+static void
+rename_color_inputs(struct u_lowering_context *ctx,
+ struct tgsi_full_instruction *inst)
+{
+ unsigned i, j;
+ for (i = 0; i < inst->Instruction.NumSrcRegs; i++) {
+ struct tgsi_src_register *src = &inst->Src[i].Register;
+ if (src->File == TGSI_FILE_INPUT) {
+ for (j = 0; j < ctx->two_side_colors; j++) {
+ if (src->Index == ctx->two_side_idx[j]) {
+ src->File = TGSI_FILE_TEMPORARY;
+ src->Index = ctx->color_base + j;
+ break;
+ }
+ }
+ }
+ }
+
+}
+
+static void
+transform_instr(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct u_lowering_context *ctx = u_lowering_context(tctx);
+
+ if (!ctx->emitted_decls) {
+ emit_decls(tctx);
+ ctx->emitted_decls = 1;
+ }
+
+ /* if emulating two-sided-color, we need to re-write some
+ * src registers:
+ */
+ if (ctx->two_side_colors)
+ rename_color_inputs(ctx, inst);
+
+ switch (inst->Instruction.Opcode) {
+ case TGSI_OPCODE_DST:
+ if (!ctx->config->lower_DST)
+ goto skip;
+ transform_dst(tctx, inst);
+ break;
+ case TGSI_OPCODE_XPD:
+ if (!ctx->config->lower_XPD)
+ goto skip;
+ transform_xpd(tctx, inst);
+ break;
+ case TGSI_OPCODE_SCS:
+ if (!ctx->config->lower_SCS)
+ goto skip;
+ transform_scs(tctx, inst);
+ break;
+ case TGSI_OPCODE_LRP:
+ if (!ctx->config->lower_LRP)
+ goto skip;
+ transform_lrp(tctx, inst);
+ break;
+ case TGSI_OPCODE_FRC:
+ if (!ctx->config->lower_FRC)
+ goto skip;
+ transform_frc(tctx, inst);
+ break;
+ case TGSI_OPCODE_POW:
+ if (!ctx->config->lower_POW)
+ goto skip;
+ transform_pow(tctx, inst);
+ break;
+ case TGSI_OPCODE_LIT:
+ if (!ctx->config->lower_LIT)
+ goto skip;
+ transform_lit(tctx, inst);
+ break;
+ case TGSI_OPCODE_EXP:
+ if (!ctx->config->lower_EXP)
+ goto skip;
+ transform_exp(tctx, inst);
+ break;
+ case TGSI_OPCODE_LOG:
+ if (!ctx->config->lower_LOG)
+ goto skip;
+ transform_log(tctx, inst);
+ break;
+ case TGSI_OPCODE_DP4:
+ if (!ctx->config->lower_DP4)
+ goto skip;
+ transform_dotp(tctx, inst);
+ break;
+ case TGSI_OPCODE_DP3:
+ if (!ctx->config->lower_DP3)
+ goto skip;
+ transform_dotp(tctx, inst);
+ break;
+ case TGSI_OPCODE_DPH:
+ if (!ctx->config->lower_DPH)
+ goto skip;
+ transform_dotp(tctx, inst);
+ break;
+ case TGSI_OPCODE_DP2:
+ if (!ctx->config->lower_DP2)
+ goto skip;
+ transform_dotp(tctx, inst);
+ break;
+ case TGSI_OPCODE_DP2A:
+ if (!ctx->config->lower_DP2A)
+ goto skip;
+ transform_dotp(tctx, inst);
+ break;
+ case TGSI_OPCODE_TEX:
+ case TGSI_OPCODE_TXP:
+ case TGSI_OPCODE_TXB:
+ case TGSI_OPCODE_TXB2:
+ case TGSI_OPCODE_TXL:
+ if (transform_samp(tctx, inst))
+ goto skip;
+ break;
+ default:
+ skip:
+ tctx->emit_instruction(tctx, inst);
+ break;
+ }
+}
+
+/* returns NULL if no lowering required, else returns the new
+ * tokens (which caller is required to free()). In either case
+ * returns the current info.
+ */
+const struct tgsi_token *
+u_transform_lowering(const struct u_lowering_config *config,
+ const struct tgsi_token *tokens,
+ struct tgsi_shader_info *info)
+{
+ struct u_lowering_context ctx;
+ struct tgsi_token *newtoks;
+ int newlen, numtmp;
+
+ /* sanity check in case limit is ever increased: */
+ assert((sizeof(config->saturate_s) * 8) >= PIPE_MAX_SAMPLERS);
+
+ memset(&ctx, 0, sizeof(ctx));
+ ctx.base.transform_instruction = transform_instr;
+ ctx.info = info;
+ ctx.config = config;
+
+ tgsi_scan_shader(tokens, info);
+
+ /* if we are adding fragment shader support to emulate two-sided
+ * color, then figure out the number of additional inputs we need
+ * to create for BCOLOR's..
+ */
+ if ((info->processor == TGSI_PROCESSOR_FRAGMENT) && config->color_two_side) {
+ int i;
+ ctx.face_idx = -1;
+ for (i = 0; i <= info->file_max[TGSI_FILE_INPUT]; i++) {
+ if (info->input_semantic_name[i] == TGSI_SEMANTIC_COLOR)
+ ctx.two_side_idx[ctx.two_side_colors++] = i;
+ if (info->input_semantic_name[i] == TGSI_SEMANTIC_FACE)
+ ctx.face_idx = i;
+ }
+ }
+
+ ctx.saturate =
+ config->saturate_r | config->saturate_s | config->saturate_t;
+
+#define OPCS(x) ((config->lower_ ## x) ? info->opcode_count[TGSI_OPCODE_ ## x] : 0)
+ /* if there are no instructions to lower, then we are done: */
+ if (!(OPCS(DST) ||
+ OPCS(XPD) ||
+ OPCS(SCS) ||
+ OPCS(LRP) ||
+ OPCS(FRC) ||
+ OPCS(POW) ||
+ OPCS(LIT) ||
+ OPCS(EXP) ||
+ OPCS(LOG) ||
+ OPCS(DP4) ||
+ OPCS(DP3) ||
+ OPCS(DPH) ||
+ OPCS(DP2) ||
+ OPCS(DP2A) ||
+ ctx.two_side_colors ||
+ ctx.saturate))
+ return NULL;
+
+#if 0 /* debug */
+ _debug_printf("BEFORE:");
+ tgsi_dump(tokens, 0);
+#endif
+
+ numtmp = 0;
+ newlen = tgsi_num_tokens(tokens);
+ if (OPCS(DST)) {
+ newlen += DST_GROW * OPCS(DST);
+ numtmp = MAX2(numtmp, DST_TMP);
+ }
+ if (OPCS(XPD)) {
+ newlen += XPD_GROW * OPCS(XPD);
+ numtmp = MAX2(numtmp, XPD_TMP);
+ }
+ if (OPCS(SCS)) {
+ newlen += SCS_GROW * OPCS(SCS);
+ numtmp = MAX2(numtmp, SCS_TMP);
+ }
+ if (OPCS(LRP)) {
+ newlen += LRP_GROW * OPCS(LRP);
+ numtmp = MAX2(numtmp, LRP_TMP);
+ }
+ if (OPCS(FRC)) {
+ newlen += FRC_GROW * OPCS(FRC);
+ numtmp = MAX2(numtmp, FRC_TMP);
+ }
+ if (OPCS(POW)) {
+ newlen += POW_GROW * OPCS(POW);
+ numtmp = MAX2(numtmp, POW_TMP);
+ }
+ if (OPCS(LIT)) {
+ newlen += LIT_GROW * OPCS(LIT);
+ numtmp = MAX2(numtmp, LIT_TMP);
+ }
+ if (OPCS(EXP)) {
+ newlen += EXP_GROW * OPCS(EXP);
+ numtmp = MAX2(numtmp, EXP_TMP);
+ }
+ if (OPCS(LOG)) {
+ newlen += LOG_GROW * OPCS(LOG);
+ numtmp = MAX2(numtmp, LOG_TMP);
+ }
+ if (OPCS(DP4)) {
+ newlen += DP4_GROW * OPCS(DP4);
+ numtmp = MAX2(numtmp, DOTP_TMP);
+ }
+ if (OPCS(DP3)) {
+ newlen += DP3_GROW * OPCS(DP3);
+ numtmp = MAX2(numtmp, DOTP_TMP);
+ }
+ if (OPCS(DPH)) {
+ newlen += DPH_GROW * OPCS(DPH);
+ numtmp = MAX2(numtmp, DOTP_TMP);
+ }
+ if (OPCS(DP2)) {
+ newlen += DP2_GROW * OPCS(DP2);
+ numtmp = MAX2(numtmp, DOTP_TMP);
+ }
+ if (OPCS(DP2A)) {
+ newlen += DP2A_GROW * OPCS(DP2A);
+ numtmp = MAX2(numtmp, DOTP_TMP);
+ }
+ if (ctx.saturate) {
+ int n = info->opcode_count[TGSI_OPCODE_TEX] +
+ info->opcode_count[TGSI_OPCODE_TXP] +
+ info->opcode_count[TGSI_OPCODE_TXB] +
+ info->opcode_count[TGSI_OPCODE_TXB2] +
+ info->opcode_count[TGSI_OPCODE_TXL];
+ newlen += SAMP_GROW * n;
+ numtmp = MAX2(numtmp, SAMP_TMP);
+ }
+
+ /* specifically don't include two_side_colors temps in the count: */
+ ctx.numtmp = numtmp;
+
+ if (ctx.two_side_colors) {
+ newlen += TWOSIDE_GROW(ctx.two_side_colors);
+ /* note: we permanently consume temp regs, re-writing references
+ * to IN.COLOR[n] to TEMP[m] (holding the output of of the CMP
+ * instruction that selects which varying to use):
+ */
+ numtmp += ctx.two_side_colors;
+ }
+
+ newlen += 2 * numtmp;
+ newlen += 5; /* immediate */
+
+ newtoks = tgsi_alloc_tokens(newlen);
+ if (!newtoks)
+ return NULL;
+
+ tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
+
+ tgsi_scan_shader(newtoks, info);
+
+#if 0 /* debug */
+ _debug_printf("AFTER:");
+ tgsi_dump(newtoks, 0);
+#endif
+
+ return newtoks;
+}
diff --git a/src/gallium/auxiliary/util/u_lowering.h b/src/gallium/auxiliary/util/u_lowering.h
new file mode 100644
index 0000000..9ab9073
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_lowering.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2014 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ * Rob Clark <robclark at freedesktop.org>
+ */
+
+#ifndef U_LOWERING_H_
+#define U_LOWERING_H_
+
+#include "pipe/p_shader_tokens.h"
+#include "tgsi/tgsi_scan.h"
+
+struct u_lowering_config {
+ /* For fragment shaders, generate a shader that emulates two
+ * sided color by inserting a BGCOLOR input for each COLOR
+ * input, and insert a CMP instruction to select the correct
+ * color to use based on the TGSI_SEMANTIC_FACE input.
+ *
+ * Note that drivers which use this to emulate two sided color
+ * will:
+ * a) need to generate (on demand) alternate shaders to use
+ * depending on the rasterizer state (ie. whether two
+ * sided shading enabled)
+ * b) expect to see the BGCOLOR semantic name in fragment
+ * shaders. During linkage, the driver should simply
+ * map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the
+ * same was as linking other outs/ins).
+ */
+ unsigned color_two_side:1;
+
+ /* TODO support for alpha_to_one as well?? */
+
+ /* Individual OPC lowerings, if lower_<opc> is TRUE then
+ * enable lowering of TGSI_OPCODE_<opc>
+ */
+ unsigned lower_DST:1;
+ unsigned lower_XPD:1;
+ unsigned lower_SCS:1;
+ unsigned lower_LRP:1;
+ unsigned lower_FRC:1;
+ unsigned lower_POW:1;
+ unsigned lower_LIT:1;
+ unsigned lower_EXP:1;
+ unsigned lower_LOG:1;
+ unsigned lower_DP4:1;
+ unsigned lower_DP3:1;
+ unsigned lower_DPH:1;
+ unsigned lower_DP2:1;
+ unsigned lower_DP2A:1;
+
+ /* To emulate certain texture wrap modes, this can be used
+ * to saturate the specified tex coord to [0.0, 1.0]. The
+ * bits are according to sampler #, ie. if, for example:
+ *
+ * (conf->saturate_s & (1 << n))
+ *
+ * is true, then the s coord for sampler n is saturated.
+ */
+ unsigned saturate_s, saturate_t, saturate_r;
+};
+
+const struct tgsi_token *u_transform_lowering(const struct u_lowering_config
+ *config,
+ const struct tgsi_token *tokens,
+ struct tgsi_shader_info *info);
+
+#endif /* U_LOWERING_H_ */
--
1.9.3
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