7a6c2da9aa
GLSL and RelaxedPrecision are quite different in what they affect. RelaxedPrecision affects operations, while this is merely implied in GLSL based on inputs. This leads to situations where we have to promote mediump inputs to highp, and the simplest approach is to force highp temporaries for inputs which are consumed in a highp context. For completeness, we also demote RelaxedPrecision inputs to mediump variables. PHI is handled by copying the PHI into a temporary. We have to be very careful with hoisted temporaries, since the child temporary will not be analyzed up-front. We inherit the hoisted-ness state and emit the hoisted child temporary as necessary. When faking the temporaries with OpCopyObject, we make sure to block any variable hoisting. Hoisting children of PHI variables is fine, since PHIs are not hoisted with the same framework as other temporaries.
147 lines
5.7 KiB
JavaScript
147 lines
5.7 KiB
JavaScript
; SPIR-V
|
|
; Version: 1.0
|
|
; Generator: Khronos Glslang Reference Front End; 10
|
|
; Bound: 15
|
|
; Schema: 0
|
|
OpCapability Shader
|
|
%1 = OpExtInstImport "GLSL.std.450"
|
|
OpMemoryModel Logical GLSL450
|
|
OpEntryPoint Fragment %main "main" %FragColor0 %FragColor1 %FragColor2 %FragColor3 %V4
|
|
OpExecutionMode %main OriginUpperLeft
|
|
OpSource ESSL 320
|
|
OpName %main "main"
|
|
OpName %FragColor0 "FragColor0"
|
|
OpName %FragColor1 "FragColor1"
|
|
OpName %FragColor2 "FragColor2"
|
|
OpName %FragColor3 "FragColor3"
|
|
OpName %V4 "V4"
|
|
OpName %V4_value0 "V4_value0"
|
|
OpName %V1_value0 "V1_value0"
|
|
OpName %V1_value1 "V1_value1"
|
|
OpName %V1_value2 "V1_value2"
|
|
OpName %float_0_weird "float_0_weird"
|
|
OpName %ubo "ubo"
|
|
OpName %ubo_mp0 "ubo_mp0"
|
|
OpName %ubo_hp0 "ubo_hp0"
|
|
OpName %block "UBO"
|
|
OpName %phi_mp "phi_mp"
|
|
OpName %phi_hp "phi_hp"
|
|
OpMemberName %block 0 "mediump_float"
|
|
OpMemberName %block 1 "highp_float"
|
|
OpDecorate %FragColor0 RelaxedPrecision
|
|
OpDecorate %FragColor0 Location 0
|
|
OpDecorate %FragColor1 RelaxedPrecision
|
|
OpDecorate %FragColor1 Location 1
|
|
OpDecorate %FragColor2 RelaxedPrecision
|
|
OpDecorate %FragColor2 Location 2
|
|
OpDecorate %FragColor3 RelaxedPrecision
|
|
OpDecorate %FragColor3 Location 3
|
|
OpDecorate %V4 RelaxedPrecision
|
|
OpDecorate %V4 Location 0
|
|
OpDecorate %V4_add RelaxedPrecision
|
|
OpDecorate %V4_mul RelaxedPrecision
|
|
OpDecorate %V1_add RelaxedPrecision
|
|
OpDecorate %V1_mul RelaxedPrecision
|
|
OpDecorate %phi_mp RelaxedPrecision
|
|
OpDecorate %mp_to_mp RelaxedPrecision
|
|
OpDecorate %hp_to_mp RelaxedPrecision
|
|
OpDecorate %V1_add_composite RelaxedPrecision
|
|
OpDecorate %V1_mul_composite RelaxedPrecision
|
|
OpDecorate %V4_sin1 RelaxedPrecision
|
|
OpDecorate %float_0_weird RelaxedPrecision
|
|
OpDecorate %ubo Binding 0
|
|
OpDecorate %ubo DescriptorSet 0
|
|
OpDecorate %block Block
|
|
OpMemberDecorate %block 0 Offset 0
|
|
OpMemberDecorate %block 1 Offset 4
|
|
OpMemberDecorate %block 0 RelaxedPrecision
|
|
%void = OpTypeVoid
|
|
%3 = OpTypeFunction %void
|
|
%float = OpTypeFloat 32
|
|
%block = OpTypeStruct %float %float
|
|
%block_ptr = OpTypePointer Uniform %block
|
|
%ubo_float_ptr = OpTypePointer Uniform %float
|
|
%ubo = OpVariable %block_ptr Uniform
|
|
%uint = OpTypeInt 32 0
|
|
%uint_0 = OpConstant %uint 0
|
|
%uint_1 = OpConstant %uint 1
|
|
%uint_2 = OpConstant %uint 2
|
|
%uint_3 = OpConstant %uint 3
|
|
%float_3 = OpConstant %float 3.0
|
|
%v4float = OpTypeVector %float 4
|
|
%float_3_splat = OpConstantComposite %v4float %float_3 %float_3 %float_3 %float_3
|
|
%_ptr_Output_v4float = OpTypePointer Output %v4float
|
|
%FragColor0 = OpVariable %_ptr_Output_v4float Output
|
|
%FragColor1 = OpVariable %_ptr_Output_v4float Output
|
|
%FragColor2 = OpVariable %_ptr_Output_v4float Output
|
|
%FragColor3 = OpVariable %_ptr_Output_v4float Output
|
|
%_ptr_Input_v4float = OpTypePointer Input %v4float
|
|
%_ptr_Input_float = OpTypePointer Input %float
|
|
%V4 = OpVariable %_ptr_Input_v4float Input
|
|
%main = OpFunction %void None %3
|
|
%5 = OpLabel
|
|
|
|
; Inherits precision in GLSL
|
|
%V4_value0 = OpLoad %v4float %V4
|
|
|
|
; Inherits precision in GLSL
|
|
%ptr_V4x = OpAccessChain %_ptr_Input_float %V4 %uint_0
|
|
|
|
; Inherits precision in GLSL
|
|
%V1_value0 = OpLoad %float %ptr_V4x
|
|
%V1_value1 = OpCompositeExtract %float %V4_value0 2
|
|
%V1_value2 = OpCopyObject %float %V1_value1
|
|
|
|
%mp_ptr = OpAccessChain %ubo_float_ptr %ubo %uint_0
|
|
%hp_ptr = OpAccessChain %ubo_float_ptr %ubo %uint_1
|
|
%ubo_mp0 = OpLoad %float %mp_ptr
|
|
%ubo_hp0 = OpLoad %float %hp_ptr
|
|
|
|
; Stays mediump
|
|
%V4_add = OpFAdd %v4float %V4_value0 %float_3_splat
|
|
; Must promote to highp
|
|
%V4_sub = OpFSub %v4float %V4_value0 %float_3_splat
|
|
; Relaxed, truncate inputs.
|
|
%V4_mul = OpFMul %v4float %V4_sub %float_3_splat
|
|
OpStore %FragColor0 %V4_add
|
|
OpStore %FragColor1 %V4_sub
|
|
OpStore %FragColor2 %V4_mul
|
|
|
|
; Same as V4 tests.
|
|
%V1_add = OpFAdd %float %V1_value0 %float_3
|
|
%float_0_weird = OpFSub %float %float_3 %ubo_hp0
|
|
%V1_sub = OpFSub %float %V1_value0 %float_0_weird
|
|
%V1_mul = OpFMul %float %V1_sub %ubo_hp0
|
|
%V1_result = OpCompositeConstruct %v4float %V1_add %V1_sub %V1_mul %float_3
|
|
OpStore %FragColor3 %V1_result
|
|
|
|
; Same as V4 tests, but composite forwarding.
|
|
%V1_add_composite = OpFAdd %float %V1_value1 %ubo_mp0
|
|
%V1_sub_composite = OpFSub %float %V1_value2 %ubo_mp0
|
|
%V1_mul_composite = OpFMul %float %V1_sub_composite %ubo_hp0
|
|
%V1_result_composite = OpCompositeConstruct %v4float %V1_add_composite %V1_sub_composite %V1_mul_composite %float_3
|
|
OpStore %FragColor3 %V1_result_composite
|
|
|
|
; Must promote input to highp.
|
|
%V4_sin0 = OpExtInst %v4float %1 Sin %V4_value0
|
|
OpStore %FragColor0 %V4_sin0
|
|
; Can keep mediump input.
|
|
%V4_sin1 = OpExtInst %v4float %1 Sin %V4_value0
|
|
OpStore %FragColor1 %V4_sin1
|
|
|
|
OpBranch %next
|
|
%next = OpLabel
|
|
%phi_mp = OpPhi %float %V1_add %5
|
|
%phi_hp = OpPhi %float %V1_sub %5
|
|
|
|
; Consume PHIs in different precision contexts
|
|
%mp_to_mp = OpFAdd %float %phi_mp %phi_mp
|
|
%mp_to_hp = OpFAdd %float %phi_mp %phi_mp
|
|
%hp_to_mp = OpFAdd %float %phi_hp %phi_hp
|
|
%hp_to_hp = OpFAdd %float %phi_hp %phi_hp
|
|
%complete = OpCompositeConstruct %v4float %mp_to_mp %mp_to_hp %hp_to_mp %hp_to_hp
|
|
OpStore %FragColor2 %complete
|
|
|
|
OpReturn
|
|
OpFunctionEnd
|