UE4 Shader code : GLSL to HLSL

ex)

vec3 r = (1.4 + 2.0*Smoothness) * Radii - Smoothness;   

-> float3 r = (1.4 + 2.0*Smoothness) * Radii - Smoothness;

 

GLSL/HLSL/Metal 命令対応表

• HLSL = DirectX (D3D8/D3D9/D3D10/D3D11/D3D12)
• GLSL = OpenGL 2/3/4, OpenGL ES 2/3, Vulkan, SpliteKit (watchOS)
• Metal = Metal (iOS/tvOS/macOS)

GLSLHLSLMetal

float	float	float
–	float1	–	HLSLのみ single vector 可能
vec2/vec3/vec4	float2/float3/float4	float2/float3/float4
mat3	float3x3	float3x3
mat4	float4x4	float4x4
mat3x4	float3x4	float3x4
int	int	int
ivec2/ivec3/ivec4	int2/int3/int4	int2/int3/int4
uint	uint	uint (unsigned int)
uvec2/uvec3/uvec4	uint2/uint3/uint4	uint2/uint3/uint4
bool	bool	bool
bvec2/bvec3/bvec4	bool2/bool3/bool4	bool2/bool3/bool4
lowp float	min10float	–	10bit fixed 以上
mediump float	half (min16float)	half	16bit fp 以上
highp float	float	float	32bit fp
double	double	–	64bit fp
highp int / uint	int / uint	int / uint	32bit int
mediump int / uint	min16int / min16uint	short / ushort	16bit int 以上
lowp int / uint	min12int	–	9bit int 以上
–	–	char / uchar	8bit int
vec3 x= vec3( a, b, c );	float3 x= { a, b, c };	float3 x= { a, b, c };
	float3 x= float3( a, b, c );	float3 x= float3( a, b, c );
float x[3]= float[]( a, b, c );	float x[3]= { a, b, c };	float x[3]= { a, b, c };
type( x )	(type)x	(type)x, type(x)	cast
matrix * matrix	mul( matrix, matrix )	matrix * matrix
vector * matrix	mul( vector, matrix )	vecotr * matrix
uniform	(uniform)	constant
in/out , varying/attribute	var : semantics	var [[qualifier]]	HLSL は in/out に function の引数と戻り値を使う。
builtin gl_* variables	system semantics SV_*	var [[qualifier]]

GLSLHLSLMetal

inversesqrt( x )	rsqrt( x )	rsqrt( x )	1/sqrt( x )
mix( x, y, s )	lerp( x, y, s )	mix( x, y, s )
clamp( x, min, max )	clamp( x, min, max )	clamp( x, min, max )
clamp( x, 0.0, 1.0 )	saturate( x )	saturate( x )
step( edge, x )	step( edge, x )	step( edge, x )	x < edge ? 0.0 : 1.0
smoothstep( min, max, x )	smoothstep( min, max, x )	smoothstep( min, max, x )	clamp( (x-min) / (max-min), 0.0, 1.0 )

GLSLHLSLMetal

sampler2D samplerobj	Texture2D<type> texobj	texture2d<type> texobj	sampler type
sampler2DShadow depthobj	Texture2D<type> depthobj	depth2d<type> depthobj	sampler type
v= texture( samplerobj, texcoord.. );	v= texobj.Sample( texcoord.. );	v= texobj.sample( sampler, texcoord .. )	sampling
v= texture2D( sampleobj, texcoord.. );	v= tex2D( sampler, texcoord.. );	–	legacy syntax
v= textureGather( depthobj, texcoord.. );	v= depthobj.SampleCmp( texcoord.. );	v= depthobj.sample_compare( … )	pcf shadow map

shaderGLSLHLSLMetal

vsh	in int gl_VertexID;	uint var_name : SV_VertexID ;	uint var_name [[vertex_id]];
	in int gl_InstanceID;	uint var_name : SV_InstanceID ;	uint var_name [[instance_id]];
	out vec4 gl_Position;	float4 … : SV_Position ;	float4 ... [[position]];
fsh/psh	out vec4 color; (GL2: gl_FragColor)	float4 … : SV_Target ; (DX9: COLOR)	half4 ... [[color(0)]];
	out float gl_FragDepth;	float … : SV_Depth ; (DX9: DEPTH)	float ... [[depth(less)]];

 

 

docs.microsoft.com/ko-kr/windows/uwp/gaming/glsl-to-hlsl-reference

HLSL 참조 - UWP applications

 

dench.flatlib.jp/opengl/glsl_hlsl

opengl:glsl_hlsl [HYPERでんち]

 

docs.microsoft.com/en-us/windows/uwp/gaming/glsl-to-hlsl-reference

GLSL-to-HLSL reference - UWP applications