Support builtin GLSL functions

[minggo]

@Mee-gu please update the progress here.

[Mee-gu]

• rename struct name and function name.

• remove in/out storage qualifiers when generating msl.

• add shader file for test.

• see more

[Mee-gu]

• [x] genType radians (genType degrees)

• [x] genType degrees (genType radians)

• [x] genType sin (genType angle)

• [x] genType cos (genType angle)

• [x] genType tan (genType angle)

• [x] genType asin (genType x)

• [x] genType acos (genType x)

• [x] genType atan (genType y, genType x)

• [x] genType atan (genType y_over_x)

• [x] genType pow (genType x, genType y)

• [x] genType exp (genType x)

• [x] genType log (genType x)

• [x] genType exp2 (genType x)

• [x] genType log2 (genType x)

• [x] genType sqrt (genType x)

• [x] genType inversesqrt (genType x) --> convert to genType rsqrt(genType x)

• [x] genType abs (genType x)

• [x] genType sign (genType x)

• [x] genType floor (genType x)

• [x] genType ceil (genType x)

• [x] genType fract (genType x)

• [x] genType mod (genType x, float y) --> convert to genType fmod(genType x, float y)

• [x] genType mod (genType x, genType y) --> convert to genType fmod(genType x, genType y)

• [x] genType min (genType x, genType y)

• [x] genType min (genType x, float y)

• [x] genType max (genType x, genType y)

• [x] genType max (genType x, float y)

• [x] genType clamp (genType x, genType minVal, genType maxVal)

• [x] genType clamp (genType x, float minVal, float maxVal)

• [x] genType mix (genType x, genType y, genType a)

• [x] genType mix (genType x, genType y, float a)

• [x] genType step (genType edge, genType x)

• [x] genType step (float edge, genType x)

• [x] genType smoothstep (genType edge0, genType edge1, genType x)

• [x] genType smoothstep (float edge0, float edge1, genType x)

• [x] float length (genType x)

• [x] float distance (genType p0, genType p1)

• [x] float dot (genType x, genType y)

• [x] vec3 cross (vec3 x, vec3 y)

• [x] genType normalize (genType x)

• [x] genType faceforward(genType N, genType I, genType Nref)

• [x] genType reflect (genType I, genType N)

• [x] genType refract(genType I, genType N, float eta)

• [x] mat matrixCompMult (mat x, mat y)

• [ ] bvec lessThan(vec x, vec y)

• [ ] bvec lessThan(ivec x, ivec y)

• [ ] bvec lessThanEqual(vec x, vec y)

• [ ] bvec lessThanEqual(ivec x, ivec y)

• [ ] bvec greaterThan(vec x, vec y)

• [ ] bvec greaterThan(ivec x, ivec y)

• [ ] bvec greaterThanEqual(vec x, vec y)

• [ ] bvec greaterThanEqual(ivec x, ivec y)

• [ ] bvec equal(vec x, vec y)

• [ ] bvec equal(ivec x, ivec y)

• [ ] bvec equal(bvec x, bvec y)

• [ ] bvec notEqual(vec x, vec y)

• [ ] bvec notEqual(ivec x, ivec y)

• [ ] bvec notEqual(bvec x, bvec y)

• [x] bool any(bvec x)

• [x] bool all(bvec x)

• [x] bvec not(bvec x)

• [ ] vec4 texture2D (sampler2D sampler, vec2 coord )

• [ ] vec4 texture2D (sampler2D sampler, vec2 coord, float bias)

• [ ] vec4 texture2DProj (sampler2D sampler, vec3 coord )

• [ ] vec4 texture2DProj (sampler2D sampler, vec3 coord, float bias)

• [ ] vec4 texture2DProj (sampler2D sampler, vec4 coord)

• [ ] vec4 texture2DProj (sampler2D sampler, vec4 coord, float bias)

• [ ] vec4 texture2DLod (sampler2D sampler, vec2 coord, float lod)

• [ ] vec4 texture2DProjLod (sampler2D sampler, vec3 coord, float lod)

• [ ] vec4 texture2DProjLod (sampler2D sampler, vec4 coord, float lod)

• [ ] vec4 textureCube (samplerCube sampler, vec3 coord )

• [ ] vec4 textureCube (samplerCube sampler, vec3 coord, float bias )

• [ ] vec4 textureCubeLod (samplerCube sampler, vec3 coord, float lod)