From bdbe77f9c6f06cfaa155f27c2ade3c523d7fbea7 Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Mon, 24 Jan 2011 17:47:10 -0500
Subject: gallium: implement modern sampling scheme

largely a merge of the previously discussed origin/gallium-resource-sampling
but updated.
the idea is to allow arbitrary binding of resources, the way opencl, new gl
versions and dx10+ require, i.e.
    DCL RES[0], 2D, FLOAT

    LOAD DST[0], SRC[0], RES[0]
    SAMPLE DST[0], SRC[0], RES[0], SAMP[0]
---
 src/gallium/auxiliary/tgsi/tgsi_ureg.c | 91 +++++++++++++++++++++++++++++++++-
 1 file changed, 89 insertions(+), 2 deletions(-)

(limited to 'src/gallium/auxiliary/tgsi/tgsi_ureg.c')

diff --git a/src/gallium/auxiliary/tgsi/tgsi_ureg.c b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
index 02de12d77d..4564ab81f9 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_ureg.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_ureg.c
@@ -1,6 +1,6 @@
 /**************************************************************************
  * 
- * Copyright 2009 VMware, Inc.
+ * Copyright 2009-2010 VMware, Inc.
  * All Rights Reserved.
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -47,6 +47,7 @@ union tgsi_any_token {
    struct tgsi_declaration_range decl_range;
    struct tgsi_declaration_dimension decl_dim;
    struct tgsi_declaration_semantic decl_semantic;
+   struct tgsi_declaration_resource decl_resource;
    struct tgsi_immediate imm;
    union  tgsi_immediate_data imm_data;
    struct tgsi_instruction insn;
@@ -137,6 +138,16 @@ struct ureg_program
    struct ureg_src sampler[PIPE_MAX_SAMPLERS];
    unsigned nr_samplers;
 
+   struct {
+      unsigned index;
+      unsigned target;
+      unsigned return_type_x;
+      unsigned return_type_y;
+      unsigned return_type_z;
+      unsigned return_type_w;
+   } resource[PIPE_MAX_SHADER_RESOURCES];
+   unsigned nr_resources;
+
    unsigned temps_active[UREG_MAX_TEMP / 32];
    unsigned nr_temps;
 
@@ -578,6 +589,41 @@ struct ureg_src ureg_DECL_sampler( struct ureg_program *ureg,
    return ureg->sampler[0];
 }
 
+/*
+ * Allocate a new shader resource.
+ */
+struct ureg_src
+ureg_DECL_resource(struct ureg_program *ureg,
+                   unsigned index,
+                   unsigned target,
+                   unsigned return_type_x,
+                   unsigned return_type_y,
+                   unsigned return_type_z,
+                   unsigned return_type_w)
+{
+   struct ureg_src reg = ureg_src_register(TGSI_FILE_RESOURCE, index);
+   uint i;
+
+   for (i = 0; i < ureg->nr_resources; i++) {
+      if (ureg->resource[i].index == index) {
+         return reg;
+      }
+   }
+
+   if (i < PIPE_MAX_SHADER_RESOURCES) {
+      ureg->resource[i].index = index;
+      ureg->resource[i].target = target;
+      ureg->resource[i].return_type_x = return_type_x;
+      ureg->resource[i].return_type_y = return_type_y;
+      ureg->resource[i].return_type_z = return_type_z;
+      ureg->resource[i].return_type_w = return_type_w;
+      ureg->nr_resources++;
+      return reg;
+   }
+
+   assert(0);
+   return reg;
+}
 
 static int
 match_or_expand_immediate( const unsigned *v,
@@ -821,9 +867,10 @@ ureg_emit_dst( struct ureg_program *ureg,
    assert(dst.File != TGSI_FILE_CONSTANT);
    assert(dst.File != TGSI_FILE_INPUT);
    assert(dst.File != TGSI_FILE_SAMPLER);
+   assert(dst.File != TGSI_FILE_RESOURCE);
    assert(dst.File != TGSI_FILE_IMMEDIATE);
    assert(dst.File < TGSI_FILE_COUNT);
-   
+
    out[n].value = 0;
    out[n].dst.File = dst.File;
    out[n].dst.WriteMask = dst.WriteMask;
@@ -1205,6 +1252,36 @@ emit_decl_range2D(struct ureg_program *ureg,
    out[2].decl_dim.Index2D = index2D;
 }
 
+static void
+emit_decl_resource(struct ureg_program *ureg,
+                   unsigned index,
+                   unsigned target,
+                   unsigned return_type_x,
+                   unsigned return_type_y,
+                   unsigned return_type_z,
+                   unsigned return_type_w )
+{
+   union tgsi_any_token *out = get_tokens(ureg, DOMAIN_DECL, 3);
+
+   out[0].value = 0;
+   out[0].decl.Type = TGSI_TOKEN_TYPE_DECLARATION;
+   out[0].decl.NrTokens = 3;
+   out[0].decl.File = TGSI_FILE_RESOURCE;
+   out[0].decl.UsageMask = 0xf;
+   out[0].decl.Interpolate = TGSI_INTERPOLATE_CONSTANT;
+
+   out[1].value = 0;
+   out[1].decl_range.First = index;
+   out[1].decl_range.Last = index;
+
+   out[2].value = 0;
+   out[2].decl_resource.Resource    = target;
+   out[2].decl_resource.ReturnTypeX = return_type_x;
+   out[2].decl_resource.ReturnTypeY = return_type_y;
+   out[2].decl_resource.ReturnTypeZ = return_type_z;
+   out[2].decl_resource.ReturnTypeW = return_type_w;
+}
+
 static void
 emit_immediate( struct ureg_program *ureg,
                 const unsigned *v,
@@ -1341,6 +1418,16 @@ static void emit_decls( struct ureg_program *ureg )
                        ureg->sampler[i].Index, 1 );
    }
 
+   for (i = 0; i < ureg->nr_resources; i++) {
+      emit_decl_resource(ureg,
+                         ureg->resource[i].index,
+                         ureg->resource[i].target,
+                         ureg->resource[i].return_type_x,
+                         ureg->resource[i].return_type_y,
+                         ureg->resource[i].return_type_z,
+                         ureg->resource[i].return_type_w);
+   }
+
    if (ureg->const_decls.nr_constant_ranges) {
       for (i = 0; i < ureg->const_decls.nr_constant_ranges; i++) {
          emit_decl_range(ureg,
-- 
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