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panfrost/midgard: Extract emit_varying_read

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Paralleling emit_uniform_read, this allows varying reads to be emitted
independent of an honest-to-goodness load vary instruction in the NIR.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-06-04 23:26:09 +00:00
parent 8c88bd0253
commit 15fae1e38c
1 changed files with 37 additions and 28 deletions
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65
src/gallium/drivers/panfrost/midgard/midgard_compile.c
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@ -1006,6 +1006,42 @@ emit_uniform_read(compiler_context *ctx, unsigned dest, unsigned offset, nir_src
}
}
static void
emit_varying_read(
compiler_context *ctx,
unsigned dest, unsigned offset,
unsigned nr_comp, unsigned component,
nir_src *indirect_offset)
{
/* XXX: Half-floats? */
/* TODO: swizzle, mask */
midgard_instruction ins = m_ld_vary_32(dest, offset);
ins.load_store.mask = (1 << nr_comp) - 1;
ins.load_store.swizzle = SWIZZLE_XYZW >> (2 * component);
midgard_varying_parameter p = {
.is_varying = 1,
.interpolation = midgard_interp_default,
.flat = /*var->data.interpolation == INTERP_MODE_FLAT*/ 0
};
unsigned u;
memcpy(&u, &p, sizeof(p));
ins.load_store.varying_parameters = u;
if (indirect_offset) {
/* We need to add in the dynamic index, moved to r27.w */
emit_indirect_offset(ctx, indirect_offset);
ins.load_store.unknown = 0x79e; /* xxx: what is this? */
} else {
/* Just a direct load */
ins.load_store.unknown = 0x1e9e; /* xxx: what is this? */
}
emit_mir_instruction(ctx, ins);
}
static void
emit_sysval_read(compiler_context *ctx, nir_intrinsic_instr *instr)
{
@ -1136,34 +1172,7 @@ emit_intrinsic(compiler_context *ctx, nir_intrinsic_instr *instr)
if (instr->intrinsic == nir_intrinsic_load_uniform && !ctx->is_blend) {
emit_uniform_read(ctx, reg, ctx->sysval_count + offset, !direct ? &instr->src[0] : NULL);
} else if (ctx->stage == MESA_SHADER_FRAGMENT && !ctx->is_blend) {
/* XXX: Half-floats? */
/* TODO: swizzle, mask */
midgard_instruction ins = m_ld_vary_32(reg, offset);
ins.load_store.mask = (1 << nr_comp) - 1;
ins.load_store.swizzle = SWIZZLE_XYZW >> (2 * component);
midgard_varying_parameter p = {
.is_varying = 1,
.interpolation = midgard_interp_default,
.flat = /*var->data.interpolation == INTERP_MODE_FLAT*/ 0
};
unsigned u;
memcpy(&u, &p, sizeof(p));
ins.load_store.varying_parameters = u;
if (direct) {
/* We have the offset totally ready */
ins.load_store.unknown = 0x1e9e; /* xxx: what is this? */
} else {
/* We have it partially ready, but we need to
* add in the dynamic index, moved to r27.w */
emit_indirect_offset(ctx, &instr->src[0]);
ins.load_store.unknown = 0x79e; /* xxx: what is this? */
}
emit_mir_instruction(ctx, ins);
emit_varying_read(ctx, reg, offset, nr_comp, component, !direct ? &instr->src[0] : NULL);
} else if (ctx->is_blend) {
/* For blend shaders, load the input color, which is
* preloaded to r0 */