Support builtin GLSL functions about glsl-optimizer

[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]

• genType radians (genType degrees)

• genType degrees (genType radians)

• genType sin (genType angle)

• genType cos (genType angle)

• genType tan (genType angle)

• genType asin (genType x)

• genType acos (genType x)

• genType atan (genType y, genType x)

• genType atan (genType y_over_x)

• genType pow (genType x, genType y)

• genType exp (genType x)

• genType log (genType x)

• genType exp2 (genType x)

• genType log2 (genType x)

• genType sqrt (genType x)

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

• genType abs (genType x)

• genType sign (genType x)

• genType floor (genType x)

• genType ceil (genType x)

• genType fract (genType x)

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

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

• genType min (genType x, genType y)

• genType min (genType x, float y)

• genType max (genType x, genType y)

• genType max (genType x, float y)

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

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

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

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

• genType step (genType edge, genType x)

• genType step (float edge, genType x)

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

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

• float length (genType x)

• float distance (genType p0, genType p1)

• float dot (genType x, genType y)

• vec3 cross (vec3 x, vec3 y)

• genType normalize (genType x)

• genType faceforward(genType N,
  genType I,
  genType Nref)

• genType reflect (genType I, genType N)

• genType refract(genType I, genType N,
  float eta)

• 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)

• bool any(bvec x)

• bool all(bvec 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)