[Mesa-dev] [PATCH 6/7] glsl_to_tgsi: add SVIEW decl support

[Rob Clark]

From: Rob Clark <robclark at freedesktop.org>

Freedreno needs sampler type information to deal with int/uint textures.
To accomplish this, start creating sampler-view declarations, as
suggested here:

 http://lists.freedesktop.org/archives/mesa-dev/2014-November/071583.html

create a sampler-view with index matching the sampler, to encode the
texture type (ie. SINT/UINT/FLOAT).  Ie:

   DCL SVIEW[n], 2D, UINT
   DCL SAMP[n]
   TEX OUT[1], IN[1], SAMP[n]

For tgsi texture instructions which do not take an explicit SVIEW
argument, the SVIEW index is implied by the SAMP index.

Signed-off-by: Rob Clark <robclark at freedesktop.org>
Reviewed-by: Roland Scheidegger <sroland at vmware.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
---
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 0e60d95..ce8f2ea 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -239,6 +239,7 @@ public:
    st_src_reg sampler; /**< sampler register */
    int sampler_array_size; /**< 1-based size of sampler array, 1 if not array */
    int tex_target; /**< One of TEXTURE_*_INDEX */
+   glsl_base_type tex_type;
    GLboolean tex_shadow;
 
    st_src_reg tex_offsets[MAX_GLSL_TEXTURE_OFFSET];
@@ -345,6 +346,8 @@ public:
 
    int num_address_regs;
    int samplers_used;
+   glsl_base_type sampler_types[PIPE_MAX_SAMPLERS];
+   int sampler_targets[PIPE_MAX_SAMPLERS];   /**< One of TGSI_TEXTURE_* */
    bool indirect_addr_consts;
    int wpos_transform_const;
 
@@ -3323,6 +3326,8 @@ glsl_to_tgsi_visitor::visit(ir_texture *ir)
       assert(!"Should not get here.");
    }
 
+   inst->tex_type = ir->type->base_type;
+
    this->result = result_src;
 }
 
@@ -3471,6 +3476,11 @@ count_resources(glsl_to_tgsi_visitor *v, gl_program *prog)
          for (int i = 0; i < inst->sampler_array_size; i++) {
             v->samplers_used |= 1 << (inst->sampler.index + i);
 
+            debug_assert(i < (int)ARRAY_SIZE(v->sampler_types));
+            v->sampler_types[i] = inst->tex_type;
+            v->sampler_targets[i] =
+               st_translate_texture_target(inst->tex_target, inst->tex_shadow);
+
             if (inst->tex_shadow) {
                prog->ShadowSamplers |= 1 << (inst->sampler.index + i);
             }
@@ -5529,7 +5539,26 @@ st_translate_program(
    /* texture samplers */
    for (i = 0; i < ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits; i++) {
       if (program->samplers_used & (1 << i)) {
+         unsigned type;
+
          t->samplers[i] = ureg_DECL_sampler(ureg, i);
+
+         switch (program->sampler_types[i]) {
+         case GLSL_TYPE_INT:
+            type = TGSI_RETURN_TYPE_SINT;
+            break;
+         case GLSL_TYPE_UINT:
+            type = TGSI_RETURN_TYPE_UINT;
+            break;
+         case GLSL_TYPE_FLOAT:
+            type = TGSI_RETURN_TYPE_FLOAT;
+            break;
+         default:
+            unreachable("not reached");
+         }
+
+         ureg_DECL_sampler_view( ureg, i, program->sampler_targets[i],
+                                 type, type, type, type );
       }
    }
 
-- 
2.4.2