Mesa (master): nv50: add craziness for non-constant TXB and TXL
Christoph Bumiller
chrisbmr at kemper.freedesktop.org
Sun Dec 13 13:39:58 UTC 2009
Module: Mesa
Branch: master
Commit: 44d8c9add2f095fc365ede751253d9fb7fc5c6e1
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=44d8c9add2f095fc365ede751253d9fb7fc5c6e1
Author: Christoph Bumiller <e0425955 at student.tuwien.ac.at>
Date: Sun Dec 13 13:44:49 2009 +0100
nv50: add craziness for non-constant TXB and TXL
If lod or bias can be non-constant across a quad of fragments,
we need to execute TEX separately for each value.
Don't ask why.
---
src/gallium/drivers/nv50/nv50_program.c | 248 +++++++++++++++++++++++++------
1 files changed, 204 insertions(+), 44 deletions(-)
diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index ddb049f..2e4279f 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -660,7 +660,7 @@ emit_mov(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src)
if (src->type == P_IMMD || src->type == P_CONST) {
set_long(pc, e);
set_data(pc, src, 0x7f, 9, e);
- e->inst[1] |= 0x20000000; /* src0 const? */
+ e->inst[1] |= 0x20000000; /* mov from c[] */
} else {
if (src->type == P_ATTR) {
set_long(pc, e);
@@ -675,9 +675,9 @@ emit_mov(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src)
if (is_long(e) && !is_immd(e)) {
e->inst[1] |= 0x04000000; /* 32-bit */
- e->inst[1] |= 0x0000c000; /* "subsubop" 0x3 */
+ e->inst[1] |= 0x0000c000; /* 32-bit c[] load / lane mask 0:1 */
if (!(e->inst[1] & 0x20000000))
- e->inst[1] |= 0x00030000; /* "subsubop" 0xf */
+ e->inst[1] |= 0x00030000; /* lane mask 2:3 */
} else
e->inst[0] |= 0x00008000;
@@ -692,6 +692,17 @@ emit_mov_immdval(struct nv50_pc *pc, struct nv50_reg *dst, float f)
FREE(imm);
}
+static void
+emit_nop(struct nv50_pc *pc)
+{
+ struct nv50_program_exec *e = exec(pc);
+
+ e->inst[0] = 0xf0000000;
+ set_long(pc, e);
+ e->inst[1] = 0xe0000000;
+ emit(pc, e);
+}
+
static boolean
check_swap_src_0_1(struct nv50_pc *pc,
struct nv50_reg **s0, struct nv50_reg **s1)
@@ -811,6 +822,33 @@ set_src_2(struct nv50_pc *pc, struct nv50_reg *src, struct nv50_program_exec *e)
}
static void
+emit_mov_from_pred(struct nv50_pc *pc, struct nv50_reg *dst, int pred)
+{
+ struct nv50_program_exec *e = exec(pc);
+
+ assert(dst->type == P_TEMP);
+ e->inst[1] = 0x20000000 | (pred << 12);
+ set_long(pc, e);
+ set_dst(pc, dst, e);
+
+ emit(pc, e);
+}
+
+static void
+emit_mov_to_pred(struct nv50_pc *pc, int pred, struct nv50_reg *src)
+{
+ struct nv50_program_exec *e = exec(pc);
+
+ e->inst[0] = 0x000001fc;
+ e->inst[1] = 0xa0000008;
+ set_long(pc, e);
+ set_pred_wr(pc, 1, pred, e);
+ set_src_0_restricted(pc, src, e);
+
+ emit(pc, e);
+}
+
+static void
emit_mul(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src0,
struct nv50_reg *src1)
{
@@ -1271,6 +1309,65 @@ emit_kil(struct nv50_pc *pc, struct nv50_reg *src)
emit(pc, e);
}
+static struct nv50_program_exec *
+emit_branch(struct nv50_pc *pc, int pred, unsigned cc,
+ struct nv50_program_exec **join)
+{
+ struct nv50_program_exec *e = exec(pc);
+
+ if (join) {
+ set_long(pc, e);
+ e->inst[0] |= 0xa0000002;
+ emit(pc, e);
+ *join = e;
+ e = exec(pc);
+ }
+
+ set_long(pc, e);
+ e->inst[0] |= 0x10000002;
+ if (pred >= 0)
+ set_pred(pc, cc, pred, e);
+ emit(pc, e);
+ return pc->p->exec_tail;
+}
+
+#define QOP_ADD 0
+#define QOP_SUBR 1
+#define QOP_SUB 2
+#define QOP_MOV_SRC1 3
+
+/* For a quad of threads / top left, top right, bottom left, bottom right
+ * pixels, do a different operation, and take src0 from a specific thread.
+ */
+static void
+emit_quadop(struct nv50_pc *pc, struct nv50_reg *dst, int wp, int lane_src0,
+ struct nv50_reg *src0, struct nv50_reg *src1, ubyte qop)
+{
+ struct nv50_program_exec *e = exec(pc);
+
+ e->inst[0] = 0xc0000000;
+ e->inst[1] = 0x80000000;
+ set_long(pc, e);
+ e->inst[0] |= lane_src0 << 16;
+ set_src_0(pc, src0, e);
+ set_src_2(pc, src1, e);
+
+ if (wp >= 0)
+ set_pred_wr(pc, 1, wp, e);
+
+ if (dst)
+ set_dst(pc, dst, e);
+ else {
+ e->inst[0] |= 0x000001fc;
+ e->inst[1] |= 0x00000008;
+ }
+
+ e->inst[0] |= (qop & 3) << 20;
+ e->inst[1] |= (qop >> 2) << 22;
+
+ emit(pc, e);
+}
+
static void
load_cube_tex_coords(struct nv50_pc *pc, struct nv50_reg *t[4],
struct nv50_reg **src, unsigned arg, boolean proj)
@@ -1365,6 +1462,94 @@ get_tex_dim(unsigned type, unsigned *dim, unsigned *arg)
}
}
+/* We shouldn't execute TEXLOD if any of the pixels in a quad have
+ * different LOD values, so branch off groups of equal LOD.
+ */
+static void
+emit_texlod_sequence(struct nv50_pc *pc, struct nv50_reg *tlod,
+ struct nv50_reg *src, struct nv50_program_exec *tex)
+{
+ struct nv50_program_exec *join_at;
+ unsigned i, target = pc->p->exec_size + 7 * 2;
+
+ /* Subtract lod of each pixel from lod of top left pixel, jump
+ * texlod insn if result is 0, then repeat for 2 other pixels.
+ */
+ emit_quadop(pc, NULL, 0, 0, tlod, tlod, 0x55);
+ emit_branch(pc, 0, 2, &join_at)->param.index = target;
+
+ for (i = 1; i < 4; ++i) {
+ emit_quadop(pc, NULL, 0, i, tlod, tlod, 0x55);
+ emit_branch(pc, 0, 2, NULL)->param.index = target;
+ }
+
+ emit_mov(pc, tlod, src); /* target */
+ emit(pc, tex); /* texlod */
+
+ join_at->param.index = target + 2 * 2;
+ emit_nop(pc);
+ pc->p->exec_tail->inst[1] |= 2; /* join _after_ tex */
+}
+
+static void
+emit_texbias_sequence(struct nv50_pc *pc, struct nv50_reg *t[4], unsigned arg,
+ struct nv50_program_exec *tex)
+{
+ struct nv50_program_exec *e;
+ struct nv50_reg imm_1248, *t123[4][4], *r_bits = alloc_temp(pc, NULL);
+ int r_pred = 0;
+ unsigned n, c, i, cc[4] = { 0x0a, 0x13, 0x11, 0x10 };
+
+ pc->allow32 = FALSE;
+ ctor_reg(&imm_1248, P_IMMD, -1, ctor_immd_4u32(pc, 1, 2, 4, 8) * 4);
+
+ /* Subtract bias value of thread i from bias values of each thread,
+ * store result in r_pred, and set bit i in r_bits if result was 0.
+ */
+ assert(arg < 4);
+ for (i = 0; i < 4; ++i, ++imm_1248.hw) {
+ emit_quadop(pc, NULL, r_pred, i, t[arg], t[arg], 0x55);
+ emit_mov(pc, r_bits, &imm_1248);
+ set_pred(pc, 2, r_pred, pc->p->exec_tail);
+ }
+ emit_mov_to_pred(pc, r_pred, r_bits);
+
+ /* The lanes of a quad are now grouped by the bit in r_pred they have
+ * set. Put the input values for TEX into a new register set for each
+ * group and execute TEX only for a specific group.
+ * We cannot use the same register set for each group because we need
+ * the derivatives, which are implicitly calculated, to be correct.
+ */
+ for (i = 1; i < 4; ++i) {
+ alloc_temp4(pc, t123[i], 0);
+
+ for (c = 0; c <= arg; ++c)
+ emit_mov(pc, t123[i][c], t[c]);
+
+ *(e = exec(pc)) = *(tex);
+ e->inst[0] &= ~0x01fc;
+ set_dst(pc, t123[i][0], e);
+ set_pred(pc, cc[i], r_pred, e);
+ emit(pc, e);
+ }
+ /* finally TEX on the original regs (where we kept the input) */
+ set_pred(pc, cc[0], r_pred, tex);
+ emit(pc, tex);
+
+ /* put the 3 * n other results into regs for lane 0 */
+ n = popcnt4(((e->inst[0] >> 25) & 0x3) | ((e->inst[1] >> 12) & 0xc));
+ for (i = 1; i < 4; ++i) {
+ for (c = 0; c < n; ++c) {
+ emit_mov(pc, t[c], t123[i][c]);
+ set_pred(pc, cc[i], r_pred, pc->p->exec_tail);
+ }
+ free_temp4(pc, t123[i]);
+ }
+
+ emit_nop(pc);
+ free_temp(pc, r_bits);
+}
+
static void
emit_tex(struct nv50_pc *pc, struct nv50_reg **dst, unsigned mask,
struct nv50_reg **src, unsigned unit, unsigned type,
@@ -1403,18 +1588,25 @@ emit_tex(struct nv50_pc *pc, struct nv50_reg **dst, unsigned mask,
emit_mov(pc, t[dim], src[2]);
}
- if (bias_lod) {
- assert(arg < 4);
- emit_mov(pc, t[arg++], src[3]);
- e->inst[1] |= (bias_lod < 0) ? 0x20000000 : 0x40000000;
- }
-
- e->inst[0] |= (arg - 1) << 22;
-
e->inst[0] |= (mask & 0x3) << 25;
e->inst[1] |= (mask & 0xc) << 12;
- emit(pc, e);
+ if (!bias_lod) {
+ e->inst[0] |= (arg - 1) << 22;
+ emit(pc, e);
+ } else
+ if (bias_lod < 0) {
+ e->inst[0] |= arg << 22;
+ e->inst[1] |= 0x20000000; /* texbias */
+ emit_mov(pc, t[arg], src[3]);
+ emit_texbias_sequence(pc, t, arg, e);
+ } else {
+ e->inst[0] |= arg << 22;
+ e->inst[1] |= 0x40000000; /* texlod */
+ emit_mov(pc, t[arg], src[3]);
+ emit_texlod_sequence(pc, t[arg], src[3], e);
+ }
+
#if 1
c = 0;
if (mask & 1) emit_mov(pc, dst[0], t[c++]);
@@ -1437,38 +1629,6 @@ emit_tex(struct nv50_pc *pc, struct nv50_reg **dst, unsigned mask,
}
static void
-emit_branch(struct nv50_pc *pc, int pred, unsigned cc,
- struct nv50_program_exec **join)
-{
- struct nv50_program_exec *e = exec(pc);
-
- if (join) {
- set_long(pc, e);
- e->inst[0] |= 0xa0000002;
- emit(pc, e);
- *join = e;
- e = exec(pc);
- }
-
- set_long(pc, e);
- e->inst[0] |= 0x10000002;
- if (pred >= 0)
- set_pred(pc, cc, pred, e);
- emit(pc, e);
-}
-
-static void
-emit_nop(struct nv50_pc *pc)
-{
- struct nv50_program_exec *e = exec(pc);
-
- e->inst[0] = 0xf0000000;
- set_long(pc, e);
- e->inst[1] = 0xe0000000;
- emit(pc, e);
-}
-
-static void
emit_ddx(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src)
{
struct nv50_program_exec *e = exec(pc);
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