skia2/tests/sksl/intrinsics/DFdy.asm.frag
Brian Salomon 943108b0b2 Don't key progams/pipelines on origin.
SkSL language features that are origin sensitive now use a uniform
to conditionally flip their result rather than generating different
code.

Previously we would insert a "rt height" uniform if sk_FragCoord needed
to be flipped. sk_FragCoord,y was implemented as "realFragCoord.y" or
"rtHeight - realFragCoord.y" depending on SkSL::ProgramSettings::fFlipY.

Now we instead use a two component vector rtFlip and sk_FragCoord.y is
always "rtFlip.x + rtFlip.y*realFragCoord.y". We configure rtFlip as
either (0, 1) or (rtHeight, -1). sk_Clockwise and dFdy simiarly use
rtFlip.y to emit code that always works with either origin.

Bug: skia:12037

Change-Id: I7a09d0caac60a58d72b76645ff31bcabde4086b6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/414796
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-07-06 18:08:06 +00:00

56 lines
2.0 KiB
JavaScript

OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %sk_FragColor %sk_Clockwise
OpExecutionMode %main OriginUpperLeft
OpName %sk_FragColor "sk_FragColor"
OpName %sk_Clockwise "sk_Clockwise"
OpName %_UniformBuffer "_UniformBuffer"
OpMemberName %_UniformBuffer 0 "a"
OpMemberName %_UniformBuffer 1 "u_skRTFlip"
OpName %main "main"
OpDecorate %sk_FragColor RelaxedPrecision
OpDecorate %sk_FragColor Location 0
OpDecorate %sk_FragColor Index 0
OpDecorate %sk_Clockwise BuiltIn FrontFacing
OpMemberDecorate %_UniformBuffer 0 Offset 0
OpMemberDecorate %_UniformBuffer 0 RelaxedPrecision
OpMemberDecorate %_UniformBuffer 1 Offset 32
OpDecorate %_UniformBuffer Block
OpDecorate %11 Binding 0
OpDecorate %11 DescriptorSet 0
OpDecorate %23 RelaxedPrecision
OpDecorate %29 RelaxedPrecision
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
%sk_FragColor = OpVariable %_ptr_Output_v4float Output
%bool = OpTypeBool
%_ptr_Input_bool = OpTypePointer Input %bool
%sk_Clockwise = OpVariable %_ptr_Input_bool Input
%v2float = OpTypeVector %float 2
%_UniformBuffer = OpTypeStruct %float %v2float
%_ptr_Uniform__UniformBuffer = OpTypePointer Uniform %_UniformBuffer
%11 = OpVariable %_ptr_Uniform__UniformBuffer Uniform
%void = OpTypeVoid
%16 = OpTypeFunction %void
%_ptr_Uniform_float = OpTypePointer Uniform %float
%int = OpTypeInt 32 1
%int_0 = OpConstant %int 0
%int_1 = OpConstant %int 1
%_ptr_Uniform_v2float = OpTypePointer Uniform %v2float
%_ptr_Output_float = OpTypePointer Output %float
%main = OpFunction %void None %16
%17 = OpLabel
%19 = OpAccessChain %_ptr_Uniform_float %11 %int_0
%23 = OpLoad %float %19
%18 = OpDPdy %float %23
%25 = OpAccessChain %_ptr_Uniform_v2float %11 %int_1
%27 = OpLoad %v2float %25
%28 = OpCompositeExtract %float %27 1
%29 = OpFMul %float %18 %28
%30 = OpAccessChain %_ptr_Output_float %sk_FragColor %int_0
OpStore %30 %29
OpReturn
OpFunctionEnd