radv: Fix float16 interpolation set up.

float16 types can have non-flat interpolation so set up the HW
correctly for that.

Fixes: 62024fa775 "radv: enable VK_KHR_16bit_storage extension / 16bit storage features"
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/common/ac_llvm_build.c

@@ -919,6 +919,37 @@ ac_build_fs_interp(struct ac_llvm_context *ctx,
 				  ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
 }
 
+LLVMValueRef
+ac_build_fs_interp_f16(struct ac_llvm_context *ctx,
+		       LLVMValueRef llvm_chan,
+		       LLVMValueRef attr_number,
+		       LLVMValueRef params,
+		       LLVMValueRef i,
+		       LLVMValueRef j)
+{
+	LLVMValueRef args[6];
+	LLVMValueRef p1;
+
+	args[0] = i;
+	args[1] = llvm_chan;
+	args[2] = attr_number;
+	args[3] = ctx->i1false;
+	args[4] = params;
+
+	p1 = ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p1.f16",
+				ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
+
+	args[0] = p1;
+	args[1] = j;
+	args[2] = llvm_chan;
+	args[3] = attr_number;
+	args[4] = ctx->i1false;
+	args[5] = params;
+
+	return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p2.f16",
+				  ctx->f16, args, 6, AC_FUNC_ATTR_READNONE);
+}
+
 LLVMValueRef
 ac_build_fs_interp_mov(struct ac_llvm_context *ctx,
 		       LLVMValueRef parameter,

src/amd/common/ac_llvm_build.h

@@ -213,6 +213,14 @@ ac_build_fs_interp(struct ac_llvm_context *ctx,
 		   LLVMValueRef i,
 		   LLVMValueRef j);
 
+LLVMValueRef
+ac_build_fs_interp_f16(struct ac_llvm_context *ctx,
+		       LLVMValueRef llvm_chan,
+		       LLVMValueRef attr_number,
+		       LLVMValueRef params,
+		       LLVMValueRef i,
+		       LLVMValueRef j);
+
 LLVMValueRef
 ac_build_fs_interp_mov(struct ac_llvm_context *ctx,
 		       LLVMValueRef parameter,

src/amd/vulkan/radv_device.c

@@ -806,7 +806,7 @@ void radv_GetPhysicalDeviceFeatures2(
 			features->storageBuffer16BitAccess = enabled;
 			features->uniformAndStorageBuffer16BitAccess = enabled;
 			features->storagePushConstant16 = enabled;
-			features->storageInputOutput16 = enabled;
+			features->storageInputOutput16 = enabled && HAVE_LLVM >= 0x900;
 			break;
 		}
 		case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SAMPLER_YCBCR_CONVERSION_FEATURES: {

src/amd/vulkan/radv_nir_to_llvm.c

@@ -92,6 +92,7 @@ struct radv_shader_context {
 	gl_shader_stage stage;
 
 	LLVMValueRef inputs[RADEON_LLVM_MAX_INPUTS * 4];
+	uint64_t float16_shaded_mask;
 
 	uint64_t input_mask;
 	uint64_t output_mask;
@@ -2197,6 +2198,7 @@ static void interp_fs_input(struct radv_shader_context *ctx,
 			    unsigned attr,
 			    LLVMValueRef interp_param,
 			    LLVMValueRef prim_mask,
+			    bool float16,
 			    LLVMValueRef result[4])
 {
 	LLVMValueRef attr_number;
@@ -2229,7 +2231,12 @@ static void interp_fs_input(struct radv_shader_context *ctx,
 	for (chan = 0; chan < 4; chan++) {
 		LLVMValueRef llvm_chan = LLVMConstInt(ctx->ac.i32, chan, false);
 
-		if (interp) {
+		if (interp && float16) {
+			result[chan] = ac_build_fs_interp_f16(&ctx->ac,
+							      llvm_chan,
+							      attr_number,
+							      prim_mask, i, j);
+		} else if (interp) {
 			result[chan] = ac_build_fs_interp(&ctx->ac,
 							  llvm_chan,
 							  attr_number,
@@ -2241,7 +2248,30 @@ static void interp_fs_input(struct radv_shader_context *ctx,
 							      attr_number,
 							      prim_mask);
 			result[chan] = LLVMBuildBitCast(ctx->ac.builder, result[chan], ctx->ac.i32, "");
-			result[chan] = LLVMBuildTruncOrBitCast(ctx->ac.builder, result[chan], LLVMTypeOf(interp_param), "");
+			result[chan] = LLVMBuildTruncOrBitCast(ctx->ac.builder, result[chan], float16 ? ctx->ac.i16 : ctx->ac.i32, "");
+		}
+	}
+}
+
+static void mark_16bit_fs_input(struct radv_shader_context *ctx,
+                                const struct glsl_type *type,
+                                int location)
+{
+	if (glsl_type_is_scalar(type) || glsl_type_is_vector(type) || glsl_type_is_matrix(type)) {
+		unsigned attrib_count = glsl_count_attribute_slots(type, false);
+		if (glsl_type_is_16bit(type)) {
+			ctx->float16_shaded_mask |= ((1ull << attrib_count) - 1) << location;
+		}
+	} else if (glsl_type_is_array(type)) {
+		unsigned stride = glsl_count_attribute_slots(glsl_get_array_element(type), false);
+		for (unsigned i = 0; i < glsl_get_length(type); ++i) {
+			mark_16bit_fs_input(ctx, glsl_get_array_element(type), location + i * stride);
+		}
+	} else {
+		assert(glsl_type_is_struct(type));
+		for (unsigned i = 0; i < glsl_get_length(type); i++) {
+			mark_16bit_fs_input(ctx, glsl_get_struct_field(type, i), location);
+			location += glsl_count_attribute_slots(glsl_get_struct_field(type, i), false);
 		}
 	}
 }
@@ -2262,7 +2292,8 @@ handle_fs_input_decl(struct radv_shader_context *ctx,
 		unsigned component_count = variable->data.location_frac +
 		                           glsl_get_length(variable->type);
 		attrib_count = (component_count + 3) / 4;
-	}
+	} else
+		mark_16bit_fs_input(ctx, variable->type, idx);
 
 	mask = ((1ull << attrib_count) - 1) << variable->data.location;
 
@@ -2277,10 +2308,8 @@ handle_fs_input_decl(struct radv_shader_context *ctx,
 
 		interp = lookup_interp_param(&ctx->abi, variable->data.interpolation, interp_type);
 	}
-	bool is_16bit = glsl_type_is_16bit(glsl_without_array(variable->type));
-	LLVMTypeRef type = is_16bit ? ctx->ac.i16 : ctx->ac.i32;
 	if (interp == NULL)
-		interp = LLVMGetUndef(type);
+		interp = LLVMGetUndef(ctx->ac.i32);
 
 	for (unsigned i = 0; i < attrib_count; ++i)
 		ctx->inputs[ac_llvm_reg_index_soa(idx + i, 0)] = interp;
@@ -2346,11 +2375,14 @@ handle_fs_inputs(struct radv_shader_context *ctx,
 		if (i >= VARYING_SLOT_VAR0 || i == VARYING_SLOT_PNTC ||
 		    i == VARYING_SLOT_PRIMITIVE_ID || i == VARYING_SLOT_LAYER) {
 			interp_param = *inputs;
-			interp_fs_input(ctx, index, interp_param, ctx->abi.prim_mask,
+			bool float16 = (ctx->float16_shaded_mask >> i) & 1;
+			interp_fs_input(ctx, index, interp_param, ctx->abi.prim_mask, float16,
 					inputs);
 
 			if (LLVMIsUndef(interp_param))
 				ctx->shader_info->fs.flat_shaded_mask |= 1u << index;
+			if (float16)
+				ctx->shader_info->fs.float16_shaded_mask |= 1u << index;
 			if (i >= VARYING_SLOT_VAR0)
 				ctx->abi.fs_input_attr_indices[i - VARYING_SLOT_VAR0] = index;
 			++index;
@@ -2362,7 +2394,7 @@ handle_fs_inputs(struct radv_shader_context *ctx,
 
 				interp_param = *inputs;
 				interp_fs_input(ctx, index, interp_param,
-						ctx->abi.prim_mask, inputs);
+						ctx->abi.prim_mask, false, inputs);
 				++index;
 			}
 		} else if (i == VARYING_SLOT_POS) {

src/amd/vulkan/radv_pipeline.c

@@ -3101,13 +3101,17 @@ radv_pipeline_generate_geometry_shader(struct radeon_cmdbuf *ctx_cs,
 	radv_pipeline_generate_hw_vs(ctx_cs, cs, pipeline, pipeline->gs_copy_shader);
 }
 
-static uint32_t offset_to_ps_input(uint32_t offset, bool flat_shade)
+static uint32_t offset_to_ps_input(uint32_t offset, bool flat_shade, bool float16)
 {
 	uint32_t ps_input_cntl;
 	if (offset <= AC_EXP_PARAM_OFFSET_31) {
 		ps_input_cntl = S_028644_OFFSET(offset);
 		if (flat_shade)
 			ps_input_cntl |= S_028644_FLAT_SHADE(1);
+		if (float16) {
+			ps_input_cntl |= S_028644_FP16_INTERP_MODE(1) |
+			                 S_028644_ATTR0_VALID(1);
+		}
 	} else {
 		/* The input is a DEFAULT_VAL constant. */
 		assert(offset >= AC_EXP_PARAM_DEFAULT_VAL_0000 &&
@@ -3132,7 +3136,7 @@ radv_pipeline_generate_ps_inputs(struct radeon_cmdbuf *ctx_cs,
 	if (ps->info.info.ps.prim_id_input) {
 		unsigned vs_offset = outinfo->vs_output_param_offset[VARYING_SLOT_PRIMITIVE_ID];
 		if (vs_offset != AC_EXP_PARAM_UNDEFINED) {
-			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, true);
+			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, true, false);
 			++ps_offset;
 		}
 	}
@@ -3142,9 +3146,9 @@ radv_pipeline_generate_ps_inputs(struct radeon_cmdbuf *ctx_cs,
 	    ps->info.info.needs_multiview_view_index) {
 		unsigned vs_offset = outinfo->vs_output_param_offset[VARYING_SLOT_LAYER];
 		if (vs_offset != AC_EXP_PARAM_UNDEFINED)
-			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, true);
+			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, true, false);
 		else
-			ps_input_cntl[ps_offset] = offset_to_ps_input(AC_EXP_PARAM_DEFAULT_VAL_0000, true);
+			ps_input_cntl[ps_offset] = offset_to_ps_input(AC_EXP_PARAM_DEFAULT_VAL_0000, true, false);
 		++ps_offset;
 	}
 
@@ -3160,14 +3164,14 @@ radv_pipeline_generate_ps_inputs(struct radeon_cmdbuf *ctx_cs,
 
 		vs_offset = outinfo->vs_output_param_offset[VARYING_SLOT_CLIP_DIST0];
 		if (vs_offset != AC_EXP_PARAM_UNDEFINED) {
-			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, false);
+			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, false, false);
 			++ps_offset;
 		}
 
 		vs_offset = outinfo->vs_output_param_offset[VARYING_SLOT_CLIP_DIST1];
 		if (vs_offset != AC_EXP_PARAM_UNDEFINED &&
 		    ps->info.info.ps.num_input_clips_culls > 4) {
-			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, false);
+			ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, false, false);
 			++ps_offset;
 		}
 	}
@@ -3175,6 +3179,7 @@ radv_pipeline_generate_ps_inputs(struct radeon_cmdbuf *ctx_cs,
 	for (unsigned i = 0; i < 32 && (1u << i) <= ps->info.fs.input_mask; ++i) {
 		unsigned vs_offset;
 		bool flat_shade;
+		bool float16;
 		if (!(ps->info.fs.input_mask & (1u << i)))
 			continue;
 
@@ -3186,8 +3191,9 @@ radv_pipeline_generate_ps_inputs(struct radeon_cmdbuf *ctx_cs,
 		}
 
 		flat_shade = !!(ps->info.fs.flat_shaded_mask & (1u << ps_offset));
+		float16 = !!(ps->info.fs.float16_shaded_mask & (1u << ps_offset));
 
-		ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, flat_shade);
+		ps_input_cntl[ps_offset] = offset_to_ps_input(vs_offset, flat_shade, float16);
 		++ps_offset;
 	}
 

src/amd/vulkan/radv_shader.h

@@ -266,6 +266,7 @@ struct radv_shader_variant_info {
 			unsigned num_interp;
 			uint32_t input_mask;
 			uint32_t flat_shaded_mask;
+			uint32_t float16_shaded_mask;
 			bool can_discard;
 			bool early_fragment_test;
 		} fs;