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nir: Add texture opcodes and source types for multisample compression

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Intel hardware does a form of multisample compression that involves an
auxilary surface called the MCS.  When an MCS is in use, you have to first
sample from the MCS with a special opcode and then pass the result of that
operation into the next sample instrucion.  Normally, we just do this
ourselves in the back-end, but we want to expose that functionality to NIR
so that we can use MCS values directly in NIR-based blorp.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand
2016-05-02 17:28:38 -07:00
parent 87a41e862b
commit f47faa4316
2 changed files with 12 additions and 0 deletions
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6
src/compiler/nir/nir.h
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@@ -1068,6 +1068,7 @@ typedef enum {
nir_tex_src_bias,
nir_tex_src_lod,
nir_tex_src_ms_index, /* MSAA sample index */
nir_tex_src_ms_mcs, /* MSAA compression value */
nir_tex_src_ddx,
nir_tex_src_ddy,
nir_tex_src_texture_offset, /* < dynamically uniform indirect offset */
@@ -1087,6 +1088,7 @@ typedef enum {
nir_texop_txd, /**< Texture look-up with partial derivatvies */
nir_texop_txf, /**< Texel fetch with explicit LOD */
nir_texop_txf_ms, /**< Multisample texture fetch */
nir_texop_txf_ms_mcs, /**< Multisample compression value fetch */
nir_texop_txs, /**< Texture size */
nir_texop_lod, /**< Texture lod query */
nir_texop_tg4, /**< Texture gather */
@@ -1215,6 +1217,7 @@ nir_tex_instr_is_query(nir_tex_instr *instr)
case nir_texop_lod:
case nir_texop_texture_samples:
case nir_texop_query_levels:
case nir_texop_txf_ms_mcs:
return true;
case nir_texop_tex:
case nir_texop_txb:
@@ -1235,6 +1238,9 @@ nir_tex_instr_src_size(nir_tex_instr *instr, unsigned src)
if (instr->src[src].src_type == nir_tex_src_coord)
return instr->coord_components;
/* The MCS value is expected to be a vec4 returned by a txf_ms_mcs */
if (instr->src[src].src_type == nir_tex_src_ms_mcs)
return 4;
if (instr->src[src].src_type == nir_tex_src_offset ||
instr->src[src].src_type == nir_tex_src_ddx ||