vc4: Switch to actually generating vertex and fragment shader code from TGSI.

This introduces an IR (QIR, for QPU IR) to do optimization on.  It's a
scalar, SSA IR in general.  It looks like optimization is pretty easy this
way, though I haven't figured out if it's going to be good for our weird
register allocation or not (or if I want to reduce to basically QPU
instructions first), and I've got some problems with it having some
multi-QPU-instruction opcodes (SEQ and CMP, for example) which I probably
want to break down.

Of course, this commit mostly doesn't work, since many other things are
still hardwired, like the VBO data.

v2: Rewrite to use a bunch of helpers (qir_OPCODE) for emitting QIR
    instructions into temporary values, and make qir_inst4 take the 4 args
    separately instead of an array (all later callers wanted individual
    args).

1 files changed, 192 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_qir.c b/src/gallium/drivers/vc4/vc4_qir.c
new file mode 100644
index 00000000000..a4bb6cd1fd1
--- /dev/null
+++ b/src/gallium/drivers/vc4/vc4_qir.c
@@ -0,0 +1,192 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+
+#include "util/u_memory.h"
+#include "util/u_simple_list.h"
+
+#include "vc4_qir.h"
+#include "vc4_qpu.h"
+
+struct qir_op_info {
+        const char *name;
+        uint8_t ndst, nsrc;
+};
+
+static const struct qir_op_info qir_op_info[] = {
+        [QOP_MOV] = { "mov", 1, 1 },
+        [QOP_FADD] = { "fadd", 1, 2 },
+        [QOP_FSUB] = { "fsub", 1, 2 },
+        [QOP_FMUL] = { "fmul", 1, 2 },
+        [QOP_FMIN] = { "fmin", 1, 2 },
+        [QOP_FMAX] = { "fmax", 1, 2 },
+        [QOP_FMINABS] = { "fminabs", 1, 2 },
+        [QOP_FMAXABS] = { "fmaxabs", 1, 2 },
+        [QOP_FTOI] = { "ftoi", 1, 1 },
+        [QOP_RCP] = { "rcp", 1, 1 },
+        [QOP_RSQ] = { "rsq", 1, 1 },
+        [QOP_EXP2] = { "exp2", 1, 2 },
+        [QOP_LOG2] = { "log2", 1, 2 },
+        [QOP_PACK_COLORS] = { "pack_colors", 1, 4 },
+        [QOP_PACK_SCALED] = { "pack_scaled", 1, 2 },
+        [QOP_VPM_WRITE] = { "vpm_write", 0, 1 },
+        [QOP_VPM_READ] = { "vpm_read", 0, 1 },
+        [QOP_TLB_COLOR_WRITE] = { "tlb_color", 0, 1 },
+};
+
+static const char *
+qir_get_op_name(enum qop qop)
+{
+        if (qop < ARRAY_SIZE(qir_op_info) && qir_op_info[qop].name)
+                return qir_op_info[qop].name;
+        else
+                return "???";
+}
+
+int
+qir_get_op_nsrc(enum qop qop)
+{
+        if (qop < ARRAY_SIZE(qir_op_info) && qir_op_info[qop].name)
+                return qir_op_info[qop].nsrc;
+        else
+                abort();
+}
+
+static void
+qir_print_reg(struct qreg reg)
+{
+        const char *files[] = {
+                [QFILE_TEMP] = "t",
+                [QFILE_VARY] = "v",
+                [QFILE_UNIF] = "u",
+        };
+
+        if (reg.file == QFILE_NULL)
+                fprintf(stderr, "null");
+        else
+                fprintf(stderr, "%s%d", files[reg.file], reg.index);
+}
+
+void
+qir_dump_inst(struct qinst *inst)
+{
+        fprintf(stderr, "%s ", qir_get_op_name(inst->op));
+
+        qir_print_reg(inst->dst);
+        for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
+                fprintf(stderr, ", ");
+                qir_print_reg(inst->src[i]);
+        }
+}
+
+void
+qir_dump(struct qcompile *c)
+{
+        struct simple_node *node;
+
+        foreach(node, &c->instructions) {
+                struct qinst *inst = (struct qinst *)node;
+                qir_dump_inst(inst);
+                fprintf(stderr, "\n");
+        }
+}
+
+struct qreg
+qir_get_temp(struct qcompile *c)
+{
+        struct qreg reg;
+
+        reg.file = QFILE_TEMP;
+        reg.index = c->num_temps++;
+
+        return reg;
+}
+
+struct qinst *
+qir_inst(enum qop op, struct qreg dst, struct qreg src0, struct qreg src1)
+{
+        struct qinst *inst = CALLOC_STRUCT(qinst);
+
+        inst->op = op;
+        inst->dst = dst;
+        inst->src = calloc(2, sizeof(inst->src[0]));
+        inst->src[0] = src0;
+        inst->src[1] = src1;
+
+        return inst;
+}
+
+struct qinst *
+qir_inst4(enum qop op, struct qreg dst,
+          struct qreg a,
+          struct qreg b,
+          struct qreg c,
+          struct qreg d)
+{
+        struct qinst *inst = CALLOC_STRUCT(qinst);
+
+        inst->op = op;
+        inst->dst = dst;
+        inst->src = calloc(4, sizeof(*inst->src));
+        inst->src[0] = a;
+        inst->src[1] = b;
+        inst->src[2] = c;
+        inst->src[3] = d;
+
+        return inst;
+}
+
+void
+qir_emit(struct qcompile *c, struct qinst *inst)
+{
+        insert_at_tail(&c->instructions, &inst->link);
+}
+
+struct qcompile *
+qir_compile_init(void)
+{
+        struct qcompile *c = CALLOC_STRUCT(qcompile);
+
+        make_empty_list(&c->instructions);
+
+        return c;
+}
+
+void
+qir_compile_destroy(struct qcompile *c)
+{
+        free(c);
+}
+
+const char *
+qir_get_stage_name(enum qstage stage)
+{
+        static const char *names[] = {
+                [QSTAGE_FRAG] = "FS",
+                [QSTAGE_VERT] = "VS",
+                [QSTAGE_COORD] = "CS",
+        };
+
+        return names[stage];
+}