radv: add support for anisotropic filtering on SI-CI

[mesa.git] / src / amd / common / ac_nir_to_llvm.c

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index c68cb9c6a30adbd40bc384a39d688734cdb56cbc..06645beb0f31b8322f7a08af6319e2e1ee3677cf 100644 (file)
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -3151,6 +3151,35 @@ static void set_tex_fetch_args(struct nir_to_llvm_context *ctx,
        tinfo->arg_count = num_args;
 }
 
+/* Disable anisotropic filtering if BASE_LEVEL == LAST_LEVEL.
+ *
+ * SI-CI:
+ *   If BASE_LEVEL == LAST_LEVEL, the shader must disable anisotropic
+ *   filtering manually. The driver sets img7 to a mask clearing
+ *   MAX_ANISO_RATIO if BASE_LEVEL == LAST_LEVEL. The shader must do:
+ *     s_and_b32 samp0, samp0, img7
+ *
+ * VI:
+ *   The ANISO_OVERRIDE sampler field enables this fix in TA.
+ */
+static LLVMValueRef sici_fix_sampler_aniso(struct nir_to_llvm_context *ctx,
+                                           LLVMValueRef res, LLVMValueRef samp)
+{
+       LLVMBuilderRef builder = ctx->builder;
+       LLVMValueRef img7, samp0;
+
+       if (ctx->options->chip_class >= VI)
+               return samp;
+
+       img7 = LLVMBuildExtractElement(builder, res,
+                                      LLVMConstInt(ctx->i32, 7, 0), "");
+       samp0 = LLVMBuildExtractElement(builder, samp,
+                                       LLVMConstInt(ctx->i32, 0, 0), "");
+       samp0 = LLVMBuildAnd(builder, samp0, img7, "");
+       return LLVMBuildInsertElement(builder, samp, samp0,
+                                     LLVMConstInt(ctx->i32, 0, 0), "");
+}
+
 static void tex_fetch_ptrs(struct nir_to_llvm_context *ctx,
                           nir_tex_instr *instr,
                           LLVMValueRef *res_ptr, LLVMValueRef *samp_ptr,
@@ -3165,6 +3194,8 @@ static void tex_fetch_ptrs(struct nir_to_llvm_context *ctx,
                        *samp_ptr = get_sampler_desc(ctx, instr->sampler, DESC_SAMPLER);
                else
                        *samp_ptr = get_sampler_desc(ctx, instr->texture, DESC_SAMPLER);
+               if (instr->sampler_dim < GLSL_SAMPLER_DIM_RECT)
+                       *samp_ptr = sici_fix_sampler_aniso(ctx, *res_ptr, *samp_ptr);
        }
        if (fmask_ptr && !instr->sampler && (instr->op == nir_texop_txf_ms ||
                                             instr->op == nir_texop_samples_identical))