radeonsi: add load_tess_level() helper

This will be shared by the tgsi and nir backends.

v2: move si_shader_io_get_unique_index_patch() call inside
    the helper.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com> (v1)
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index f6e3083..e579916 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -1916,6 +1916,24 @@ static LLVMValueRef si_load_tess_coord(struct ac_shader_abi *abi,
        return lp_build_gather_values(&ctx->gallivm, coord, 4);
 }
 
+static LLVMValueRef load_tess_level(struct si_shader_context *ctx,
+                                   unsigned semantic_name)
+{
+       LLVMValueRef buffer, base, addr;
+
+       int param = si_shader_io_get_unique_index_patch(semantic_name, 0);
+
+       buffer = desc_from_addr_base64k(ctx, ctx->param_tcs_offchip_addr_base64k);
+
+       base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);
+       addr = get_tcs_tes_buffer_address(ctx, get_rel_patch_id(ctx), NULL,
+                                         LLVMConstInt(ctx->i32, param, 0));
+
+       return buffer_load(&ctx->bld_base, ctx->f32,
+                          ~0, buffer, base, addr, true);
+
+}
+
 void si_load_system_value(struct si_shader_context *ctx,
                          unsigned index,
                          const struct tgsi_full_declaration *decl)
@@ -2034,21 +2052,8 @@ void si_load_system_value(struct si_shader_context *ctx,
 
        case TGSI_SEMANTIC_TESSINNER:
        case TGSI_SEMANTIC_TESSOUTER:
-       {
-               LLVMValueRef buffer, base, addr;
-               int param = si_shader_io_get_unique_index_patch(decl->Semantic.Name, 0);
-
-               buffer = desc_from_addr_base64k(ctx, ctx->param_tcs_offchip_addr_base64k);
-
-               base = LLVMGetParam(ctx->main_fn, ctx->param_tcs_offchip_offset);
-               addr = get_tcs_tes_buffer_address(ctx, get_rel_patch_id(ctx), NULL,
-                                         LLVMConstInt(ctx->i32, param, 0));
-
-               value = buffer_load(&ctx->bld_base, ctx->f32,
-                                   ~0, buffer, base, addr, true);
-
+               value = load_tess_level(ctx, decl->Semantic.Name);
                break;
-       }
 
        case TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI:
        case TGSI_SEMANTIC_DEFAULT_TESSINNER_SI: