glslc/test/parameter_tests.py - third_party/shaderc - Git at Google

 # Copyright 2015 The Shaderc Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.

 import expect
 import os.path
 from glslc_test_framework import inside_glslc_testsuite
 from placeholder import FileShader, StdinShader, TempFileName


 @inside_glslc_testsuite('File')
 class SimpleFileCompiled(expect.ValidObjectFile):
     """Tests whether or not a simple glsl file compiles."""

     shader = FileShader('#version 310 es\nvoid main() {}', '.frag')
     glslc_args = ['-c', shader]


 @inside_glslc_testsuite('File')
 class NotSpecifyingOutputName(expect.SuccessfulReturn,
                               expect.CorrectObjectFilePreamble):
     """Tests that when there is no -o and -E/-S/-c specified, output as a.spv."""

     shader = FileShader('#version 140\nvoid main() {}', '.frag')
     glslc_args = [shader]

     def check_output_a_spv(self, status):
         output_name = os.path.join(status.directory, 'a.spv')
         return self.verify_object_file_preamble(output_name)


 @inside_glslc_testsuite('Parameters')
 class HelpParameters(
     expect.ReturnCodeIsZero, expect.StdoutMatch, expect.StderrMatch):
     """Tests the --help flag outputs correctly and does not produce and error."""

     glslc_args = ['--help']

     expected_stdout = '''glslc - Compile shaders into SPIR-V

 Usage: glslc [options] file...

 An input file of - represents standard input.

 Options:
   -c                Only run preprocess, compile, and assemble steps.
   -Dmacro[=defn]    Add an implicit macro definition.
   -E                Outputs only the results of the preprocessing step.
                     Output defaults to standard output.
   -fauto-bind-uniforms
                     Automatically assign bindings to uniform variables that
                     don't have an explicit 'binding' layout in the shader
                     source.
   -fauto-map-locations
                     Automatically assign locations to uniform variables that
                     don't have an explicit 'location' layout in the shader
                     source.
   -fauto-combined-image-sampler
                     Removes sampler variables and converts existing textures
                     to combined image-samplers.
   -fentry-point=<name>
                     Specify the entry point name for HLSL compilation, for
                     all subsequent source files.  Default is "main".
   -fhlsl-16bit-types
                     Enable 16-bit type support for HLSL.
   -fhlsl_functionality1, -fhlsl-functionality1
                     Enable extension SPV_GOOGLE_hlsl_functionality1 for HLSL
                     compilation.
   -fhlsl-iomap      Use HLSL IO mappings for bindings.
   -fhlsl-offsets    Use HLSL offset rules for packing members of blocks.
                     Affects only GLSL.  HLSL rules are always used for HLSL.
   -finvert-y        Invert position.Y output in vertex shader.
   -flimit=<settings>
                     Specify resource limits. Each limit is specified by a limit
                     name followed by an integer value.  Tokens should be
                     separated by whitespace.  If the same limit is specified
                     several times, only the last setting takes effect.
   -flimit-file <file>
                     Set limits as specified in the given file.
   -fnan-clamp       Generate code for max and min builtins so that, when given
                     a NaN operand, the other operand is returned. Similarly,
                     the clamp builtin will favour the non-NaN operands, as if
                     clamp were implemented as a composition of max and min.
   -fpreserve-bindings
                     Preserve all binding declarations, even if those bindings
                     are not used.
   -fresource-set-binding [stage] <reg0> <set0> <binding0>
                         [<reg1> <set1> <binding1>...]
                     Explicitly sets the descriptor set and binding for
                     HLSL resources, by register name.  Optionally restrict
                     it to a single stage.
   -fcbuffer-binding-base [stage] <value>
                     Same as -fubo-binding-base.
   -fimage-binding-base [stage] <value>
                     Sets the lowest automatically assigned binding number for
                     images.  Optionally only set it for a single shader stage.
                     For HLSL, the resource register number is added to this
                     base.
   -fsampler-binding-base [stage] <value>
                     Sets the lowest automatically assigned binding number for
                     samplers  Optionally only set it for a single shader stage.
                     For HLSL, the resource register number is added to this
                     base.
   -fssbo-binding-base [stage] <value>
                     Sets the lowest automatically assigned binding number for
                     shader storage buffer objects (SSBO).  Optionally only set
                     it for a single shader stage.  Only affects GLSL.
   -ftexture-binding-base [stage] <value>
                     Sets the lowest automatically assigned binding number for
                     textures.  Optionally only set it for a single shader stage.
                     For HLSL, the resource register number is added to this
                     base.
   -fuav-binding-base [stage] <value>
                     For automatically assigned bindings for unordered access
                     views (UAV), the register number is added to this base to
                     determine the binding number.  Optionally only set it for
                     a single shader stage.  Only affects HLSL.
   -fubo-binding-base [stage] <value>
                     Sets the lowest automatically assigned binding number for
                     uniform buffer objects (UBO).  Optionally only set it for
                     a single shader stage.
                     For HLSL, the resource register number is added to this
                     base.
   -fshader-stage=<stage>
                     Treat subsequent input files as having stage <stage>.
                     Valid stages are vertex, vert, fragment, frag, tesscontrol,
                     tesc, tesseval, tese, geometry, geom, compute, and comp.
   -g                Generate source-level debug information.
   -h                Display available options.
   --help            Display available options.
   -I <value>        Add directory to include search path.
   -mfmt=<format>    Output SPIR-V binary code using the selected format. This
                     option may be specified only when the compilation output is
                     in SPIR-V binary code form. Available options are:
                       bin   - SPIR-V binary words.  This is the default.
                       c     - Binary words as C initializer list of 32-bit ints
                       num   - List of comma-separated 32-bit hex integers
   -M                Generate make dependencies. Implies -E and -w.
   -MM               An alias for -M.
   -MD               Generate make dependencies and compile.
   -MF <file>        Write dependency output to the given file.
   -MT <target>      Specify the target of the rule emitted by dependency
                     generation.
   -O                Optimize the generated SPIR-V code for better performance.
   -Os               Optimize the generated SPIR-V code for smaller size.
   -O0               Disable optimization.
   -o <file>         Write output to <file>.
                     A file name of '-' represents standard output.
   -std=<value>      Version and profile for GLSL input files. Possible values
                     are concatenations of version and profile, e.g. 310es,
                     450core, etc.  Ignored for HLSL files.
   -S                Emit SPIR-V assembly instead of binary.
   --show-limits     Display available limit names and their default values.
   --target-env=<environment>
                     Set the target client environment, and the semantics
                     of warnings and errors.  An optional suffix can specify
                     the client version.  Values are:
                         vulkan1.0       # The default
                         vulkan1.1
                         vulkan1.2
                         vulkan1.3
                         vulkan          # Same as vulkan1.0
                         opengl4.5
                         opengl          # Same as opengl4.5
   --target-spv=<spirv-version>
                     Set the SPIR-V version to be used for the generated SPIR-V
                     module.  The default is the highest version of SPIR-V
                     required to be supported for the target environment.
                     For example, default for vulkan1.0 is spv1.0, and
                     the default for vulkan1.1 is spv1.3,
                     the default for vulkan1.2 is spv1.5.
                     the default for vulkan1.3 is spv1.6.
                     Values are:
                         spv1.0, spv1.1, spv1.2, spv1.3, spv1.4, spv1.5, spv1.6
   --version         Display compiler version information.
   -w                Suppresses all warning messages.
   -Werror           Treat all warnings as errors.
   -x <language>     Treat subsequent input files as having type <language>.
                     Valid languages are: glsl, hlsl.
                     For files ending in .hlsl the default is hlsl.
                     Otherwise the default is glsl.
 '''

     expected_stderr = ''


 @inside_glslc_testsuite('Parameters')
 class HelpIsNotTooWide(expect.StdoutNoWiderThan80Columns):
     """Tests that --help output is not too wide."""

     glslc_args = ['--help']


 @inside_glslc_testsuite('Parameters')
 class UnknownSingleLetterArgument(expect.ErrorMessage):
     """Tests that an unknown argument triggers an error message."""

     glslc_args = ['-a']
     expected_error = ["glslc: error: unknown argument: '-a'\n"]


 @inside_glslc_testsuite('Parameters')
 class UnknownMultiLetterArgument(expect.ErrorMessage):
     """Tests that an unknown argument triggers an error message."""

     glslc_args = ['-zzz']
     expected_error = ["glslc: error: unknown argument: '-zzz'\n"]


 @inside_glslc_testsuite('Parameters')
 class UnsupportedOption(expect.ErrorMessage):
     """Tests that an unsupported option triggers an error message."""

     glslc_args = ['--unsupported-option']
     expected_error = [
         "glslc: error: unsupported option: '--unsupported-option'\n"]


 @inside_glslc_testsuite('File')
 class FileNotFound(expect.ErrorMessage):
     """Tests the error message if a file cannot be found."""

     blabla_file = TempFileName('blabla.frag')
     glslc_args = [blabla_file]
     expected_error = [
         "glslc: error: cannot open input file: '", blabla_file,
         "': No such file or directory\n"]


 @inside_glslc_testsuite('Unsupported')
 class LinkingNotSupported(expect.ErrorMessage):
     """Tests the error message generated by linking not supported yet."""

     shader1 = FileShader('#version 140\nvoid main() {}', '.vert')
     shader2 = FileShader('#version 140\nvoid main() {}', '.frag')
     glslc_args = [shader1, shader2]
     expected_error = [
         'glslc: error: linking multiple files is not supported yet. ',
         'Use -c to compile files individually.\n']


 @inside_glslc_testsuite('Unsupported')
 class MultipleStdinUnsupported(expect.ErrorMessage):
     """Tests the error message generated by having more than one - input."""

     glslc_args = ['-c', '-fshader-stage=vertex', '-', '-']
     expected_error = [
         'glslc: error: specifying standard input "-" as input more'
         ' than once is not allowed.\n']


 @inside_glslc_testsuite('Parameters')
 class StdinWithoutShaderStage(expect.StdoutMatch, expect.StderrMatch):
     """Tests that you must use -fshader-stage when specifying - as input."""
     shader = StdinShader(
         """#version 140
     int a() {
     }
     void main() {
       int x = a();
     }
     """)
     glslc_args = [shader]

     expected_stdout = ''
     expected_stderr = [
         "glslc: error: '-': -fshader-stage required when input is from "
         'standard input "-"\n']


 @inside_glslc_testsuite('Parameters')
 class LimitsHelp(expect.StdoutMatch, expect.StderrMatch):
     """Tests --show-limits shows correct output."""

     glslc_args = ['--show-limits']

     expected_stderr = ''
     expected_stdout = """MaxLights 8
 MaxClipPlanes 6
 MaxTextureUnits 2
 MaxTextureCoords 8
 MaxVertexAttribs 16
 MaxVertexUniformComponents 4096
 MaxVaryingFloats 60
 MaxVertexTextureImageUnits 16
 MaxCombinedTextureImageUnits 80
 MaxTextureImageUnits 16
 MaxFragmentUniformComponents 1024
 MaxDrawBuffers 8
 MaxVertexUniformVectors 256
 MaxVaryingVectors 15
 MaxFragmentUniformVectors 256
 MaxVertexOutputVectors 16
 MaxFragmentInputVectors 15
 MinProgramTexelOffset -8
 MaxProgramTexelOffset 7
 MaxClipDistances 8
 MaxComputeWorkGroupCountX 65535
 MaxComputeWorkGroupCountY 65535
 MaxComputeWorkGroupCountZ 65535
 MaxComputeWorkGroupSizeX 1024
 MaxComputeWorkGroupSizeY 1024
 MaxComputeWorkGroupSizeZ 64
 MaxComputeUniformComponents 512
 MaxComputeTextureImageUnits 16
 MaxComputeImageUniforms 8
 MaxComputeAtomicCounters 8
 MaxComputeAtomicCounterBuffers 1
 MaxVaryingComponents 60
 MaxVertexOutputComponents 64
 MaxGeometryInputComponents 64
 MaxGeometryOutputComponents 128
 MaxFragmentInputComponents 128
 MaxImageUnits 8
 MaxCombinedImageUnitsAndFragmentOutputs 8
 MaxCombinedShaderOutputResources 8
 MaxImageSamples 0
 MaxVertexImageUniforms 0
 MaxTessControlImageUniforms 0
 MaxTessEvaluationImageUniforms 0
 MaxGeometryImageUniforms 0
 MaxFragmentImageUniforms 8
 MaxCombinedImageUniforms 8
 MaxGeometryTextureImageUnits 16
 MaxGeometryOutputVertices 256
 MaxGeometryTotalOutputComponents 1024
 MaxGeometryUniformComponents 512
 MaxGeometryVaryingComponents 60
 MaxTessControlInputComponents 128
 MaxTessControlOutputComponents 128
 MaxTessControlTextureImageUnits 16
 MaxTessControlUniformComponents 1024
 MaxTessControlTotalOutputComponents 4096
 MaxTessEvaluationInputComponents 128
 MaxTessEvaluationOutputComponents 128
 MaxTessEvaluationTextureImageUnits 16
 MaxTessEvaluationUniformComponents 1024
 MaxTessPatchComponents 120
 MaxPatchVertices 32
 MaxTessGenLevel 64
 MaxViewports 16
 MaxVertexAtomicCounters 0
 MaxTessControlAtomicCounters 0
 MaxTessEvaluationAtomicCounters 0
 MaxGeometryAtomicCounters 0
 MaxFragmentAtomicCounters 8
 MaxCombinedAtomicCounters 8
 MaxAtomicCounterBindings 1
 MaxVertexAtomicCounterBuffers 0
 MaxTessControlAtomicCounterBuffers 0
 MaxTessEvaluationAtomicCounterBuffers 0
 MaxGeometryAtomicCounterBuffers 0
 MaxFragmentAtomicCounterBuffers 0
 MaxCombinedAtomicCounterBuffers 1
 MaxAtomicCounterBufferSize 32
 MaxTransformFeedbackBuffers 4
 MaxTransformFeedbackInterleavedComponents 64
 MaxCullDistances 8
 MaxCombinedClipAndCullDistances 8
 MaxSamples 4
 MaxMeshOutputVerticesNV 256
 MaxMeshOutputPrimitivesNV 512
 MaxMeshWorkGroupSizeX_NV 32
 MaxMeshWorkGroupSizeY_NV 1
 MaxMeshWorkGroupSizeZ_NV 1
 MaxTaskWorkGroupSizeX_NV 32
 MaxTaskWorkGroupSizeY_NV 1
 MaxTaskWorkGroupSizeZ_NV 1
 MaxMeshViewCountNV 4
 MaxMeshOutputVerticesEXT 256
 MaxMeshOutputPrimitivesEXT 256
 MaxMeshWorkGroupSizeX_EXT 128
 MaxMeshWorkGroupSizeY_EXT 128
 MaxMeshWorkGroupSizeZ_EXT 128
 MaxTaskWorkGroupSizeX_EXT 128
 MaxTaskWorkGroupSizeY_EXT 128
 MaxTaskWorkGroupSizeZ_EXT 128
 MaxMeshViewCountEXT 4
 MaxDualSourceDrawBuffersEXT 1
 """
	# Copyright 2015 The Shaderc Authors. All rights reserved.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	import expect
	import os.path
	from glslc_test_framework import inside_glslc_testsuite
	from placeholder import FileShader, StdinShader, TempFileName


	@inside_glslc_testsuite('File')
	class SimpleFileCompiled(expect.ValidObjectFile):
	"""Tests whether or not a simple glsl file compiles."""

	shader = FileShader('#version 310 es\nvoid main() {}', '.frag')
	glslc_args = ['-c', shader]


	@inside_glslc_testsuite('File')
	class NotSpecifyingOutputName(expect.SuccessfulReturn,
	expect.CorrectObjectFilePreamble):
	"""Tests that when there is no -o and -E/-S/-c specified, output as a.spv."""

	shader = FileShader('#version 140\nvoid main() {}', '.frag')
	glslc_args = [shader]

	def check_output_a_spv(self, status):
	output_name = os.path.join(status.directory, 'a.spv')
	return self.verify_object_file_preamble(output_name)


	@inside_glslc_testsuite('Parameters')
	class HelpParameters(
	expect.ReturnCodeIsZero, expect.StdoutMatch, expect.StderrMatch):
	"""Tests the --help flag outputs correctly and does not produce and error."""

	glslc_args = ['--help']

	expected_stdout = '''glslc - Compile shaders into SPIR-V

	Usage: glslc [options] file...

	An input file of - represents standard input.

	Options:
	-c Only run preprocess, compile, and assemble steps.
	-Dmacro[=defn] Add an implicit macro definition.
	-E Outputs only the results of the preprocessing step.
	Output defaults to standard output.
	-fauto-bind-uniforms
	Automatically assign bindings to uniform variables that
	don't have an explicit 'binding' layout in the shader
	source.
	-fauto-map-locations
	Automatically assign locations to uniform variables that
	don't have an explicit 'location' layout in the shader
	source.
	-fauto-combined-image-sampler
	Removes sampler variables and converts existing textures
	to combined image-samplers.
	-fentry-point=<name>
	Specify the entry point name for HLSL compilation, for
	all subsequent source files. Default is "main".
	-fhlsl-16bit-types
	Enable 16-bit type support for HLSL.
	-fhlsl_functionality1, -fhlsl-functionality1
	Enable extension SPV_GOOGLE_hlsl_functionality1 for HLSL
	compilation.
	-fhlsl-iomap Use HLSL IO mappings for bindings.
	-fhlsl-offsets Use HLSL offset rules for packing members of blocks.
	Affects only GLSL. HLSL rules are always used for HLSL.
	-finvert-y Invert position.Y output in vertex shader.
	-flimit=<settings>
	Specify resource limits. Each limit is specified by a limit
	name followed by an integer value. Tokens should be
	separated by whitespace. If the same limit is specified
	several times, only the last setting takes effect.
	-flimit-file <file>
	Set limits as specified in the given file.
	-fnan-clamp Generate code for max and min builtins so that, when given
	a NaN operand, the other operand is returned. Similarly,
	the clamp builtin will favour the non-NaN operands, as if
	clamp were implemented as a composition of max and min.
	-fpreserve-bindings
	Preserve all binding declarations, even if those bindings
	are not used.
	-fresource-set-binding [stage] <reg0> <set0> <binding0>
	[<reg1> <set1> <binding1>...]
	Explicitly sets the descriptor set and binding for
	HLSL resources, by register name. Optionally restrict
	it to a single stage.
	-fcbuffer-binding-base [stage] <value>
	Same as -fubo-binding-base.
	-fimage-binding-base [stage] <value>
	Sets the lowest automatically assigned binding number for
	images. Optionally only set it for a single shader stage.
	For HLSL, the resource register number is added to this
	base.
	-fsampler-binding-base [stage] <value>
	Sets the lowest automatically assigned binding number for
	samplers Optionally only set it for a single shader stage.
	For HLSL, the resource register number is added to this
	base.
	-fssbo-binding-base [stage] <value>
	Sets the lowest automatically assigned binding number for
	shader storage buffer objects (SSBO). Optionally only set
	it for a single shader stage. Only affects GLSL.
	-ftexture-binding-base [stage] <value>
	Sets the lowest automatically assigned binding number for
	textures. Optionally only set it for a single shader stage.
	For HLSL, the resource register number is added to this
	base.
	-fuav-binding-base [stage] <value>
	For automatically assigned bindings for unordered access
	views (UAV), the register number is added to this base to
	determine the binding number. Optionally only set it for
	a single shader stage. Only affects HLSL.
	-fubo-binding-base [stage] <value>
	Sets the lowest automatically assigned binding number for
	uniform buffer objects (UBO). Optionally only set it for
	a single shader stage.
	For HLSL, the resource register number is added to this
	base.
	-fshader-stage=<stage>
	Treat subsequent input files as having stage <stage>.
	Valid stages are vertex, vert, fragment, frag, tesscontrol,
	tesc, tesseval, tese, geometry, geom, compute, and comp.
	-g Generate source-level debug information.
	-h Display available options.
	--help Display available options.
	-I <value> Add directory to include search path.
	-mfmt=<format> Output SPIR-V binary code using the selected format. This
	option may be specified only when the compilation output is
	in SPIR-V binary code form. Available options are:
	bin - SPIR-V binary words. This is the default.
	c - Binary words as C initializer list of 32-bit ints
	num - List of comma-separated 32-bit hex integers
	-M Generate make dependencies. Implies -E and -w.
	-MM An alias for -M.
	-MD Generate make dependencies and compile.
	-MF <file> Write dependency output to the given file.
	-MT <target> Specify the target of the rule emitted by dependency
	generation.
	-O Optimize the generated SPIR-V code for better performance.
	-Os Optimize the generated SPIR-V code for smaller size.
	-O0 Disable optimization.
	-o <file> Write output to <file>.
	A file name of '-' represents standard output.
	-std=<value> Version and profile for GLSL input files. Possible values
	are concatenations of version and profile, e.g. 310es,
	450core, etc. Ignored for HLSL files.
	-S Emit SPIR-V assembly instead of binary.
	--show-limits Display available limit names and their default values.
	--target-env=<environment>
	Set the target client environment, and the semantics
	of warnings and errors. An optional suffix can specify
	the client version. Values are:
	vulkan1.0 # The default
	vulkan1.1
	vulkan1.2
	vulkan1.3
	vulkan # Same as vulkan1.0
	opengl4.5
	opengl # Same as opengl4.5
	--target-spv=<spirv-version>
	Set the SPIR-V version to be used for the generated SPIR-V
	module. The default is the highest version of SPIR-V
	required to be supported for the target environment.
	For example, default for vulkan1.0 is spv1.0, and
	the default for vulkan1.1 is spv1.3,
	the default for vulkan1.2 is spv1.5.
	the default for vulkan1.3 is spv1.6.
	Values are:
	spv1.0, spv1.1, spv1.2, spv1.3, spv1.4, spv1.5, spv1.6
	--version Display compiler version information.
	-w Suppresses all warning messages.
	-Werror Treat all warnings as errors.
	-x <language> Treat subsequent input files as having type <language>.
	Valid languages are: glsl, hlsl.
	For files ending in .hlsl the default is hlsl.
	Otherwise the default is glsl.
	'''

	expected_stderr = ''


	@inside_glslc_testsuite('Parameters')
	class HelpIsNotTooWide(expect.StdoutNoWiderThan80Columns):
	"""Tests that --help output is not too wide."""

	glslc_args = ['--help']


	@inside_glslc_testsuite('Parameters')
	class UnknownSingleLetterArgument(expect.ErrorMessage):
	"""Tests that an unknown argument triggers an error message."""

	glslc_args = ['-a']
	expected_error = ["glslc: error: unknown argument: '-a'\n"]


	@inside_glslc_testsuite('Parameters')
	class UnknownMultiLetterArgument(expect.ErrorMessage):
	"""Tests that an unknown argument triggers an error message."""

	glslc_args = ['-zzz']
	expected_error = ["glslc: error: unknown argument: '-zzz'\n"]


	@inside_glslc_testsuite('Parameters')
	class UnsupportedOption(expect.ErrorMessage):
	"""Tests that an unsupported option triggers an error message."""

	glslc_args = ['--unsupported-option']
	expected_error = [
	"glslc: error: unsupported option: '--unsupported-option'\n"]


	@inside_glslc_testsuite('File')
	class FileNotFound(expect.ErrorMessage):
	"""Tests the error message if a file cannot be found."""

	blabla_file = TempFileName('blabla.frag')
	glslc_args = [blabla_file]
	expected_error = [
	"glslc: error: cannot open input file: '", blabla_file,
	"': No such file or directory\n"]


	@inside_glslc_testsuite('Unsupported')
	class LinkingNotSupported(expect.ErrorMessage):
	"""Tests the error message generated by linking not supported yet."""

	shader1 = FileShader('#version 140\nvoid main() {}', '.vert')
	shader2 = FileShader('#version 140\nvoid main() {}', '.frag')
	glslc_args = [shader1, shader2]
	expected_error = [
	'glslc: error: linking multiple files is not supported yet. ',
	'Use -c to compile files individually.\n']


	@inside_glslc_testsuite('Unsupported')
	class MultipleStdinUnsupported(expect.ErrorMessage):
	"""Tests the error message generated by having more than one - input."""

	glslc_args = ['-c', '-fshader-stage=vertex', '-', '-']
	expected_error = [
	'glslc: error: specifying standard input "-" as input more'
	' than once is not allowed.\n']


	@inside_glslc_testsuite('Parameters')
	class StdinWithoutShaderStage(expect.StdoutMatch, expect.StderrMatch):
	"""Tests that you must use -fshader-stage when specifying - as input."""
	shader = StdinShader(
	"""#version 140
	int a() {
	}
	void main() {
	int x = a();
	}
	""")
	glslc_args = [shader]

	expected_stdout = ''
	expected_stderr = [
	"glslc: error: '-': -fshader-stage required when input is from "
	'standard input "-"\n']


	@inside_glslc_testsuite('Parameters')
	class LimitsHelp(expect.StdoutMatch, expect.StderrMatch):
	"""Tests --show-limits shows correct output."""

	glslc_args = ['--show-limits']

	expected_stderr = ''
	expected_stdout = """MaxLights 8
	MaxClipPlanes 6
	MaxTextureUnits 2
	MaxTextureCoords 8
	MaxVertexAttribs 16
	MaxVertexUniformComponents 4096
	MaxVaryingFloats 60
	MaxVertexTextureImageUnits 16
	MaxCombinedTextureImageUnits 80
	MaxTextureImageUnits 16
	MaxFragmentUniformComponents 1024
	MaxDrawBuffers 8
	MaxVertexUniformVectors 256
	MaxVaryingVectors 15
	MaxFragmentUniformVectors 256
	MaxVertexOutputVectors 16
	MaxFragmentInputVectors 15
	MinProgramTexelOffset -8
	MaxProgramTexelOffset 7
	MaxClipDistances 8
	MaxComputeWorkGroupCountX 65535
	MaxComputeWorkGroupCountY 65535
	MaxComputeWorkGroupCountZ 65535
	MaxComputeWorkGroupSizeX 1024
	MaxComputeWorkGroupSizeY 1024
	MaxComputeWorkGroupSizeZ 64
	MaxComputeUniformComponents 512
	MaxComputeTextureImageUnits 16
	MaxComputeImageUniforms 8
	MaxComputeAtomicCounters 8
	MaxComputeAtomicCounterBuffers 1
	MaxVaryingComponents 60
	MaxVertexOutputComponents 64
	MaxGeometryInputComponents 64
	MaxGeometryOutputComponents 128
	MaxFragmentInputComponents 128
	MaxImageUnits 8
	MaxCombinedImageUnitsAndFragmentOutputs 8
	MaxCombinedShaderOutputResources 8
	MaxImageSamples 0
	MaxVertexImageUniforms 0
	MaxTessControlImageUniforms 0
	MaxTessEvaluationImageUniforms 0
	MaxGeometryImageUniforms 0
	MaxFragmentImageUniforms 8
	MaxCombinedImageUniforms 8
	MaxGeometryTextureImageUnits 16
	MaxGeometryOutputVertices 256
	MaxGeometryTotalOutputComponents 1024
	MaxGeometryUniformComponents 512
	MaxGeometryVaryingComponents 60
	MaxTessControlInputComponents 128
	MaxTessControlOutputComponents 128
	MaxTessControlTextureImageUnits 16
	MaxTessControlUniformComponents 1024
	MaxTessControlTotalOutputComponents 4096
	MaxTessEvaluationInputComponents 128
	MaxTessEvaluationOutputComponents 128
	MaxTessEvaluationTextureImageUnits 16
	MaxTessEvaluationUniformComponents 1024
	MaxTessPatchComponents 120
	MaxPatchVertices 32
	MaxTessGenLevel 64
	MaxViewports 16
	MaxVertexAtomicCounters 0
	MaxTessControlAtomicCounters 0
	MaxTessEvaluationAtomicCounters 0
	MaxGeometryAtomicCounters 0
	MaxFragmentAtomicCounters 8
	MaxCombinedAtomicCounters 8
	MaxAtomicCounterBindings 1
	MaxVertexAtomicCounterBuffers 0
	MaxTessControlAtomicCounterBuffers 0
	MaxTessEvaluationAtomicCounterBuffers 0
	MaxGeometryAtomicCounterBuffers 0
	MaxFragmentAtomicCounterBuffers 0
	MaxCombinedAtomicCounterBuffers 1
	MaxAtomicCounterBufferSize 32
	MaxTransformFeedbackBuffers 4
	MaxTransformFeedbackInterleavedComponents 64
	MaxCullDistances 8
	MaxCombinedClipAndCullDistances 8
	MaxSamples 4
	MaxMeshOutputVerticesNV 256
	MaxMeshOutputPrimitivesNV 512
	MaxMeshWorkGroupSizeX_NV 32
	MaxMeshWorkGroupSizeY_NV 1
	MaxMeshWorkGroupSizeZ_NV 1
	MaxTaskWorkGroupSizeX_NV 32
	MaxTaskWorkGroupSizeY_NV 1
	MaxTaskWorkGroupSizeZ_NV 1
	MaxMeshViewCountNV 4
	MaxMeshOutputVerticesEXT 256
	MaxMeshOutputPrimitivesEXT 256
	MaxMeshWorkGroupSizeX_EXT 128
	MaxMeshWorkGroupSizeY_EXT 128
	MaxMeshWorkGroupSizeZ_EXT 128
	MaxTaskWorkGroupSizeX_EXT 128
	MaxTaskWorkGroupSizeY_EXT 128
	MaxTaskWorkGroupSizeZ_EXT 128
	MaxMeshViewCountEXT 4
	MaxDualSourceDrawBuffersEXT 1
	"""