nir: Add a find_variable_with_[driver_]location helper

[mesa.git] / src / compiler / nir / nir_lower_input_attachments.c

diff --git a/src/compiler/nir/nir_lower_input_attachments.c b/src/compiler/nir/nir_lower_input_attachments.c
index 25473eab558f85cc73316b9a77f657c0b351bd42..20fa801b45d4abe169a1210be73fc30f1c4ec18f 100644 (file)
--- a/src/compiler/nir/nir_lower_input_attachments.c
+++ b/src/compiler/nir/nir_lower_input_attachments.c
@@ -27,14 +27,14 @@
 static nir_ssa_def *
 load_frag_coord(nir_builder *b)
 {
-   nir_foreach_variable(var, &b->shader->inputs) {
-      if (var->data.location == VARYING_SLOT_POS)
-         return nir_load_var(b, var);
+   nir_variable *pos =
+      nir_find_variable_with_location(b->shader, nir_var_shader_in,
+                                      VARYING_SLOT_POS);
+   if (pos == NULL) {
+      pos = nir_variable_create(b->shader, nir_var_shader_in,
+                                glsl_vec4_type(), NULL);
+      pos->data.location = VARYING_SLOT_POS;
    }
-
-   nir_variable *pos = nir_variable_create(b->shader, nir_var_shader_in,
-                                           glsl_vec4_type(), NULL);
-   pos->data.location = VARYING_SLOT_POS;
    /**
     * From Vulkan spec:
     *   "The OriginLowerLeft execution mode must not be used; fragment entry
@@ -48,7 +48,8 @@ load_frag_coord(nir_builder *b)
 }
 
 static bool
-try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load)
+try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load,
+                     bool use_fragcoord_sysval)
 {
    nir_deref_instr *deref = nir_src_as_deref(load->src[0]);
    assert(glsl_type_is_image(deref->type));
@@ -64,7 +65,9 @@ try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load)
    nir_builder_init(&b, impl);
    b.cursor = nir_instr_remove(&load->instr);
 
-   nir_ssa_def *frag_coord = nir_f2i32(&b, load_frag_coord(&b));
+   nir_ssa_def *frag_coord = use_fragcoord_sysval ? nir_load_frag_coord(&b)
+                                                  : load_frag_coord(&b);
+   frag_coord = nir_f2i32(&b, frag_coord);
    nir_ssa_def *offset = nir_ssa_for_src(&b, load->src[1], 2);
    nir_ssa_def *pos = nir_iadd(&b, frag_coord, offset);
 
@@ -112,6 +115,8 @@ try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load)
       tex->src[3].src = load->src[2];
    }
 
+   tex->texture_non_uniform = nir_intrinsic_access(load) & ACCESS_NON_UNIFORM;
+
    nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
    nir_builder_instr_insert(&b, &tex->instr);
 
@@ -121,8 +126,36 @@ try_lower_input_load(nir_function_impl *impl, nir_intrinsic_instr *load)
    return true;
 }
 
+static bool
+try_lower_input_texop(nir_function_impl *impl, nir_tex_instr *tex,
+                                                        bool use_fragcoord_sysval)
+{
+   nir_deref_instr *deref = nir_src_as_deref(tex->src[0].src);
+
+   if (glsl_get_sampler_dim(deref->type) != GLSL_SAMPLER_DIM_SUBPASS_MS)
+      return false;
+
+   nir_builder b;
+   nir_builder_init(&b, impl);
+   b.cursor = nir_before_instr(&tex->instr);
+
+   nir_ssa_def *frag_coord = use_fragcoord_sysval ? nir_load_frag_coord(&b)
+                                                  : load_frag_coord(&b);
+   frag_coord = nir_f2i32(&b, frag_coord);
+
+   nir_ssa_def *layer = nir_load_layer_id(&b);
+   nir_ssa_def *coord = nir_vec3(&b, nir_channel(&b, frag_coord, 0),
+                                     nir_channel(&b, frag_coord, 1), layer);
+
+   tex->coord_components = 3;
+
+   nir_instr_rewrite_src(&tex->instr, &tex->src[1].src, nir_src_for_ssa(coord));
+
+   return true;
+}
+
 bool
-nir_lower_input_attachments(nir_shader *shader)
+nir_lower_input_attachments(nir_shader *shader, bool use_fragcoord_sysval)
 {
    assert(shader->info.stage == MESA_SHADER_FRAGMENT);
    bool progress = false;
@@ -133,15 +166,29 @@ nir_lower_input_attachments(nir_shader *shader)
 
       nir_foreach_block(block, function->impl) {
          nir_foreach_instr_safe(instr, block) {
-            if (instr->type != nir_instr_type_intrinsic)
-               continue;
-
-            nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr);
-
-            if (load->intrinsic != nir_intrinsic_image_deref_load)
-               continue;
-
-            progress |= try_lower_input_load(function->impl, load);
+            switch (instr->type) {
+            case nir_instr_type_tex: {
+               nir_tex_instr *tex = nir_instr_as_tex(instr);
+
+               if (tex->op == nir_texop_fragment_mask_fetch ||
+                   tex->op == nir_texop_fragment_fetch) {
+                  progress |= try_lower_input_texop(function->impl, tex,
+                                                    use_fragcoord_sysval);
+               }
+               break;
+            }
+            case nir_instr_type_intrinsic: {
+               nir_intrinsic_instr *load = nir_instr_as_intrinsic(instr);
+
+               if (load->intrinsic == nir_intrinsic_image_deref_load) {
+                  progress |= try_lower_input_load(function->impl, load,
+                                                   use_fragcoord_sysval);
+               }
+               break;
+            }
+            default:
+               break;
+            }
          }
       }
    }