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pan/mdg: Implement texture gathers

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As previously shown, it is a mode on top of textureLod. The main gotcha
is the results are swizzled; we reuse the Broadcom lowering for that.

Also, there's a pretty significant erratum affecting gathers of cubemaps
which can be dealt with... eventually.

Fixes:

   dEQP-GLES31.functional.texture.gather.basic.2d.*
   dEQP-GLES31.functional.texture.gather.basic.2d_array.*

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6516>
This commit is contained in:
Alyssa Rosenzweig
2020-08-28 09:48:38 -04:00
parent 661123bb19
commit 7dab5749c8
1 changed files with 8 additions and 2 deletions
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10
src/panfrost/midgard/midgard_compile.c
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@@ -497,6 +497,7 @@ optimise_nir(nir_shader *nir, unsigned quirks, bool is_blend)
.lower_txp = ~0,
.lower_tex_without_implicit_lod =
(quirks & MIDGARD_EXPLICIT_LOD),
.lower_tg4_broadcom_swizzle = true,
/* TODO: we have native gradient.. */
.lower_txd = true,
@@ -2068,7 +2069,11 @@ pan_attach_constant_bias(
static enum mali_texture_mode
mdg_texture_mode(nir_tex_instr *instr)
{
if (instr->is_shadow)
if (instr->op == nir_texop_tg4 && instr->is_shadow)
return TEXTURE_GATHER_SHADOW;
else if (instr->op == nir_texop_tg4)
return TEXTURE_GATHER_X + instr->component;
else if (instr->is_shadow)
return TEXTURE_SHADOW;
else
return TEXTURE_NORMAL;
@@ -2112,7 +2117,7 @@ emit_texop_native(compiler_context *ctx, nir_tex_instr *instr,
}
};
if (instr->is_shadow && !instr->is_new_style_shadow)
if (instr->is_shadow && !instr->is_new_style_shadow && instr->op != nir_texop_tg4)
for (int i = 0; i < 4; ++i)
ins.swizzle[0][i] = COMPONENT_X;
@@ -2282,6 +2287,7 @@ emit_tex(compiler_context *ctx, nir_tex_instr *instr)
emit_texop_native(ctx, instr, TEXTURE_OP_NORMAL);
break;
case nir_texop_txl:
case nir_texop_tg4:
emit_texop_native(ctx, instr, TEXTURE_OP_LOD);
break;
case nir_texop_txf: