nir: add image_min_lod_agx

for EXT_image_view_min_lod emulation.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33386>

src/compiler/nir/nir.c

@@ -3167,6 +3167,7 @@ nir_tex_instr_need_sampler(const nir_tex_instr *instr)
    case nir_texop_texture_samples:
    case nir_texop_samples_identical:
    case nir_texop_descriptor_amd:
+   case nir_texop_image_min_lod_agx:
       return false;
    default:
       return true;
@@ -3212,6 +3213,7 @@ nir_tex_instr_result_size(const nir_tex_instr *instr)
    case nir_texop_samples_identical:
    case nir_texop_fragment_mask_fetch_amd:
    case nir_texop_lod_bias_agx:
+   case nir_texop_image_min_lod_agx:
    case nir_texop_has_custom_border_color_agx:
       return 1;
 
@@ -3247,6 +3249,7 @@ nir_tex_instr_is_query(const nir_tex_instr *instr)
    case nir_texop_descriptor_amd:
    case nir_texop_sampler_descriptor_amd:
    case nir_texop_lod_bias_agx:
+   case nir_texop_image_min_lod_agx:
    case nir_texop_custom_border_color_agx:
    case nir_texop_has_custom_border_color_agx:
    case nir_texop_hdr_dim_nv:

src/compiler/nir/nir.h

@@ -2376,6 +2376,8 @@ typedef enum nir_texop {
    nir_texop_sampler_descriptor_amd,
    /** Returns the sampler's LOD bias */
    nir_texop_lod_bias_agx,
+   /** Returns the image view's min LOD */
+   nir_texop_image_min_lod_agx,
    /** Returns a bool indicating that the sampler uses a custom border colour */
    nir_texop_has_custom_border_color_agx,
    /** Returns the sampler's custom border colour (if has_custom_border_agx) */

src/compiler/nir/nir_print.c

@@ -1772,6 +1772,9 @@ print_tex_instr(nir_tex_instr *instr, print_state *state)
    case nir_texop_lod_bias_agx:
       fprintf(fp, "lod_bias_agx ");
       break;
+   case nir_texop_image_min_lod_agx:
+      fprintf(fp, "image_min_lod_agx ");
+      break;
    case nir_texop_has_custom_border_color_agx:
       fprintf(fp, "has_custom_border_color_agx ");
       break;

src/compiler/nir/nir_validate.c

@@ -828,6 +828,10 @@ validate_tex_src_texture_deref(nir_tex_instr *instr, validate_state *state,
    case nir_texop_lod_bias_agx:
       validate_assert(state, nir_alu_type_get_base_type(instr->dest_type) == nir_type_float);
       break;
+   case nir_texop_image_min_lod_agx:
+      validate_assert(state, instr->dest_type == nir_type_float16 ||
+                                instr->dest_type == nir_type_uint16);
+      break;
    case nir_texop_samples_identical:
    case nir_texop_has_custom_border_color_agx:
       validate_assert(state, nir_alu_type_get_base_type(instr->dest_type) == nir_type_bool);

src/compiler/spirv/spirv_to_nir.c

@@ -3322,6 +3322,7 @@ vtn_handle_texture(struct vtn_builder *b, SpvOp opcode,
       vtn_fail("unexpected nir_texop_*descriptor_amd");
       break;
    case nir_texop_lod_bias_agx:
+   case nir_texop_image_min_lod_agx:
    case nir_texop_custom_border_color_agx:
    case nir_texop_has_custom_border_color_agx:
       vtn_fail("unexpected nir_texop_*_agx");