AuroraMiddleware/SPIRV-Cross
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Implement workaround for textureLod on 2D array shadow.

Browse Source 
This does not exist in GLSL, but it exists in HLSL if LOD == 0.0.
This commit is contained in:
Hans-Kristian Arntzen 2017-06-23 09:44:41 +02:00
parent c6051bbbfa
commit ad2b7c05e7
6 changed files with 188 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
reference/shaders/asm/frag/hlsl-sample-cmp-level-zero.asm.frag Normal file
View File

@ -0,0 +1,27 @@
#version 450
uniform sampler2DArrayShadow SPIRV_Cross_CombinedShadowMapShadowSamplerPCF;
layout(location = 0) in vec2 texCoords;
layout(location = 1) in float cascadeIndex;
layout(location = 2) in float fragDepth;
layout(location = 0) out vec4 _entryPointOutput;
vec4 _main(vec2 texCoords_1, float cascadeIndex_1, float fragDepth_1)
{
vec4 _60 = vec4(vec3(texCoords_1, cascadeIndex_1), fragDepth_1);
float c = textureGrad(SPIRV_Cross_CombinedShadowMapShadowSamplerPCF, vec4(_60.xyz, _60.w), vec2(0.0), vec2(0.0));
return vec4(c, c, c, c);
}
void main()
{
vec2 texCoords_1 = texCoords;
float cascadeIndex_1 = cascadeIndex;
float fragDepth_1 = fragDepth;
vec2 param = texCoords_1;
float param_1 = cascadeIndex_1;
float param_2 = fragDepth_1;
_entryPointOutput = _main(param, param_1, param_2);
}

6
reference/shaders/asm/frag/invalidation.asm.frag
View File

@ -1,8 +1,8 @@
#version 450
in float v0;
in float v1;
out float FragColor;
layout(location = 0) in float v0;
layout(location = 1) in float v1;
layout(location = 0) out float FragColor;
void main()
{

113
shaders/asm/frag/hlsl-sample-cmp-level-zero.asm.frag Normal file
View File

@ -0,0 +1,113 @@
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 1
; Bound: 70
; Schema: 0
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %texCoords_1 %cascadeIndex_1 %fragDepth_1 %_entryPointOutput
OpExecutionMode %main OriginUpperLeft
OpSource HLSL 500
OpName %main "main"
OpName %_main_vf2_f1_f1_ "@main(vf2;f1;f1;"
OpName %texCoords "texCoords"
OpName %cascadeIndex "cascadeIndex"
OpName %fragDepth "fragDepth"
OpName %c "c"
OpName %ShadowMap "ShadowMap"
OpName %ShadowSamplerPCF "ShadowSamplerPCF"
OpName %texCoords_0 "texCoords"
OpName %texCoords_1 "texCoords"
OpName %cascadeIndex_0 "cascadeIndex"
OpName %cascadeIndex_1 "cascadeIndex"
OpName %fragDepth_0 "fragDepth"
OpName %fragDepth_1 "fragDepth"
OpName %_entryPointOutput "@entryPointOutput"
OpName %param "param"
OpName %param_0 "param"
OpName %param_1 "param"
OpDecorate %ShadowMap DescriptorSet 0
OpDecorate %ShadowSamplerPCF DescriptorSet 0
OpDecorate %texCoords_1 Location 0
OpDecorate %cascadeIndex_1 Location 1
OpDecorate %fragDepth_1 Location 2
OpDecorate %_entryPointOutput Location 0
%void = OpTypeVoid
%3 = OpTypeFunction %void
%float = OpTypeFloat 32
%v2float = OpTypeVector %float 2
%_ptr_Function_v2float = OpTypePointer Function %v2float
%_ptr_Function_float = OpTypePointer Function %float
%v4float = OpTypeVector %float 4
%11 = OpTypeFunction %v4float %_ptr_Function_v2float %_ptr_Function_float %_ptr_Function_float
%18 = OpTypeImage %float 2D 0 1 0 1 Unknown
%_ptr_UniformConstant_18 = OpTypePointer UniformConstant %18
%ShadowMap = OpVariable %_ptr_UniformConstant_18 UniformConstant
%22 = OpTypeSampler
%_ptr_UniformConstant_22 = OpTypePointer UniformConstant %22
%ShadowSamplerPCF = OpVariable %_ptr_UniformConstant_22 UniformConstant
%26 = OpTypeImage %float 2D 1 1 0 1 Unknown
%27 = OpTypeSampledImage %26
%v3float = OpTypeVector %float 3
%float_0 = OpConstant %float 0
%_ptr_Input_v2float = OpTypePointer Input %v2float
%texCoords_1 = OpVariable %_ptr_Input_v2float Input
%_ptr_Input_float = OpTypePointer Input %float
%cascadeIndex_1 = OpVariable %_ptr_Input_float Input
%fragDepth_1 = OpVariable %_ptr_Input_float Input
%_ptr_Output_v4float = OpTypePointer Output %v4float
%_entryPointOutput = OpVariable %_ptr_Output_v4float Output
%main = OpFunction %void None %3
%5 = OpLabel
%texCoords_0 = OpVariable %_ptr_Function_v2float Function
%cascadeIndex_0 = OpVariable %_ptr_Function_float Function
%fragDepth_0 = OpVariable %_ptr_Function_float Function
%param = OpVariable %_ptr_Function_v2float Function
%param_0 = OpVariable %_ptr_Function_float Function
%param_1 = OpVariable %_ptr_Function_float Function
%53 = OpLoad %v2float %texCoords_1
OpStore %texCoords_0 %53
%57 = OpLoad %float %cascadeIndex_1
OpStore %cascadeIndex_0 %57
%60 = OpLoad %float %fragDepth_1
OpStore %fragDepth_0 %60
%64 = OpLoad %v2float %texCoords_0
OpStore %param %64
%66 = OpLoad %float %cascadeIndex_0
OpStore %param_0 %66
%68 = OpLoad %float %fragDepth_0
OpStore %param_1 %68
%69 = OpFunctionCall %v4float %_main_vf2_f1_f1_ %param %param_0 %param_1
OpStore %_entryPointOutput %69
OpReturn
OpFunctionEnd
%_main_vf2_f1_f1_ = OpFunction %v4float None %11
%texCoords = OpFunctionParameter %_ptr_Function_v2float
%cascadeIndex = OpFunctionParameter %_ptr_Function_float
%fragDepth = OpFunctionParameter %_ptr_Function_float
%16 = OpLabel
%c = OpVariable %_ptr_Function_float Function
%21 = OpLoad %18 %ShadowMap
%25 = OpLoad %22 %ShadowSamplerPCF
%28 = OpSampledImage %27 %21 %25
%29 = OpLoad %v2float %texCoords
%30 = OpLoad %float %cascadeIndex
%32 = OpCompositeExtract %float %29 0
%33 = OpCompositeExtract %float %29 1
%34 = OpCompositeConstruct %v3float %32 %33 %30
%35 = OpLoad %float %fragDepth
%36 = OpCompositeExtract %float %34 0
%37 = OpCompositeExtract %float %34 1
%38 = OpCompositeExtract %float %34 2
%39 = OpCompositeConstruct %v4float %36 %37 %38 %35
%41 = OpCompositeExtract %float %39 3
%42 = OpImageSampleDrefExplicitLod %float %28 %39 %41 Lod %float_0
OpStore %c %42
%43 = OpLoad %float %c
%44 = OpLoad %float %c
%45 = OpLoad %float %c
%46 = OpLoad %float %c
%47 = OpCompositeConstruct %v4float %43 %44 %45 %46
OpReturnValue %47
OpFunctionEnd

3
shaders/asm/frag/invalidation.asm.frag
View File

@ -15,6 +15,9 @@
OpName %b "b"
OpName %v1 "v1"
OpName %FragColor "FragColor"
OpDecorate %v0 Location 0
OpDecorate %v1 Location 1
OpDecorate %FragColor Location 0
%2 = OpTypeVoid
%3 = OpTypeFunction %2
%float = OpTypeFloat 32

41
spirv_glsl.cpp
View File

@ -2973,6 +2973,19 @@ string CompilerGLSL::to_function_name(uint32_t, const SPIRType &imgtype, bool is
{
string fname;
// textureLod on sampler2DArrayShadow does not exist in GLSL for some reason.
// To emulate this, we will have to use textureGrad with a constant gradient of 0.
// The workaround will assert that the LOD is in fact constant 0, or we cannot emit correct code.
// This happens for HLSL SampleCmpLevelZero on Texture2DArray.
bool workaround_lod_array_shadow_as_grad = false;
if (imgtype.image.arrayed && imgtype.image.dim == Dim2D && imgtype.image.depth && lod)
{
auto *constant_lod = maybe_get<SPIRConstant>(lod);
if (!constant_lod || constant_lod->scalar_f32() != 0.0f)
SPIRV_CROSS_THROW("textureLod on sampler2DArraySahdow is not constant 0.0. This cannot be expressed in GLSL.");
workaround_lod_array_shadow_as_grad = true;
}
if (is_fetch)
fname += "texelFetch";
else
@ -2985,9 +2998,9 @@ string CompilerGLSL::to_function_name(uint32_t, const SPIRType &imgtype, bool is
fname += "Offsets";
if (is_proj)
fname += "Proj";
if (has_grad)
if (has_grad || workaround_lod_array_shadow_as_grad)
fname += "Grad";
if (!!lod)
if (!!lod && !workaround_lod_array_shadow_as_grad)
fname += "Lod";
}
@ -2998,7 +3011,7 @@ string CompilerGLSL::to_function_name(uint32_t, const SPIRType &imgtype, bool is
}
// Returns the function args for a texture sampling function for the specified image and sampling characteristics.
string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &, bool, bool, bool, uint32_t coord,
string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &imgtype, bool, bool, bool, uint32_t coord,
uint32_t coord_components, uint32_t dref, uint32_t grad_x, uint32_t grad_y,
uint32_t lod, uint32_t coffset, uint32_t offset, uint32_t bias, uint32_t comp,
uint32_t sample, bool *p_forward)
@ -3030,7 +3043,18 @@ string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &, bool, bool
// Only enclose the UV expression if needed.
auto coord_expr = (*swizzle_expr == '\0') ? to_expression(coord) : (to_enclosed_expression(coord) + swizzle_expr);
// TODO: implement rest ... A bit intensive.
// textureLod on sampler2DArrayShadow does not exist in GLSL for some reason.
// To emulate this, we will have to use textureGrad with a constant gradient of 0.
// The workaround will assert that the LOD is in fact constant 0, or we cannot emit correct code.
// This happens for HLSL SampleCmpLevelZero on Texture2DArray.
bool workaround_lod_array_shadow_as_grad = false;
if (imgtype.image.arrayed && imgtype.image.dim == Dim2D && imgtype.image.depth && lod)
{
auto *constant_lod = maybe_get<SPIRConstant>(lod);
if (!constant_lod || constant_lod->scalar_f32() != 0.0f)
SPIRV_CROSS_THROW("textureLod on sampler2DArraySahdow is not constant 0.0. This cannot be expressed in GLSL.");
workaround_lod_array_shadow_as_grad = true;
}
if (dref)
{
@ -3075,6 +3099,14 @@ string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &, bool, bool
}
if (lod)
{
if (workaround_lod_array_shadow_as_grad)
{
// Implement textureGrad() instead. LOD == 0.0 is implemented as gradient of 0.0.
// Implementing this as plain texture() is not safe on some implementations.
farg_str += ", vec2(0.0), vec2(0.0)";
}
else
{
if (check_explicit_lod_allowed(lod))
{
@ -3083,6 +3115,7 @@ string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &, bool, bool
farg_str += to_expression(lod);
}
}
}
if (coffset)
{

2
test_shaders.py
View File

@ -161,7 +161,7 @@ def cross_compile(shader, vulkan, spirv, invalid_spirv, eliminate, is_legacy, fl
if vulkan or spirv:
subprocess.check_call([spirv_cross_path, '--entry', 'main', '--vulkan-semantics', '--output', vulkan_glsl_path, spirv_path] + extra_args)
validate_shader(vulkan_glsl_path, vulkan)
validate_shader(vulkan_glsl_path, True)
return (spirv_path, glsl_path, vulkan_glsl_path if vulkan else None)