Module: Glslkit::Types

Defined in:
lib/glslkit/types.rb

Overview

GLSLの型名をWebGL2のsetterに対応付ける唯一の正。wasm側のWebGL バインディングはこのテーブルを自前で再実装するのではなく、 Types.setter_for("mat4") 等を呼び出すことを想定している。

Constant Summary collapse

NON_MATRIX_SETTERS = 
{
  "float" => "uniform1fv",
  "vec2" => "uniform2fv",
  "vec3" => "uniform3fv",
  "vec4" => "uniform4fv",
  "int" => "uniform1iv",
  "bool" => "uniform1iv",
  "ivec2" => "uniform2iv",
  "bvec2" => "uniform2iv",
  "ivec3" => "uniform3iv",
  "bvec3" => "uniform3iv",
  "ivec4" => "uniform4iv",
  "bvec4" => "uniform4iv",
  "uint" => "uniform1uiv",
  "uvec2" => "uniform2uiv",
  "uvec3" => "uniform3uiv",
  "uvec4" => "uniform4uiv"
}.freeze
MATRIX_SETTERS = 
{
  "mat2" => "uniformMatrix2fv",
  "mat3" => "uniformMatrix3fv",
  "mat4" => "uniformMatrix4fv",
  "mat2x3" => "uniformMatrix2x3fv",
  "mat2x4" => "uniformMatrix2x4fv",
  "mat3x2" => "uniformMatrix3x2fv",
  "mat3x4" => "uniformMatrix3x4fv",
  "mat4x2" => "uniformMatrix4x2fv",
  "mat4x3" => "uniformMatrix4x3fv"
}.freeze
SAMPLER_TYPES = 
%w[
  sampler2D sampler3D samplerCube sampler2DArray
  isampler2D isampler3D isamplerCube isampler2DArray
  usampler2D usampler3D usamplerCube usampler2DArray
  sampler2DShadow samplerCubeShadow sampler2DArrayShadow
].freeze
NON_MATRIX_COMPONENTS =

1要素あたりの成分数(§8.5)。setterに渡す配列の期待長(= components * array_size)の 算出に使う。

{
  "float" => 1, "int" => 1, "bool" => 1, "uint" => 1,
  "vec2" => 2, "ivec2" => 2, "bvec2" => 2, "uvec2" => 2,
  "vec3" => 3, "ivec3" => 3, "bvec3" => 3, "uvec3" => 3,
  "vec4" => 4, "ivec4" => 4, "bvec4" => 4, "uvec4" => 4
}.freeze
MATRIX_COMPONENTS =

matCxR は C列R行の行列(GLSL仕様)。成分数は C * R。

{
  "mat2" => 4, "mat3" => 9, "mat4" => 16,
  "mat2x3" => 6, "mat2x4" => 8,
  "mat3x2" => 6, "mat3x4" => 12,
  "mat4x2" => 8, "mat4x3" => 12
}.freeze
ENTRIES = 
{
  **NON_MATRIX_SETTERS.to_h { |type, setter|
    [type, {setter: setter, matrix: false, sampler: false, components: NON_MATRIX_COMPONENTS.fetch(type)}]
  },
  **MATRIX_SETTERS.to_h { |type, setter|
    [type, {setter: setter, matrix: true, sampler: false, components: MATRIX_COMPONENTS.fetch(type)}]
  },
  **SAMPLER_TYPES.to_h { |type| [type, {setter: "uniform1iv", matrix: false, sampler: true, components: 1}] }
}.freeze

Class Method Summary collapse

Class Method Details

.components_for(type) ⇒ Object 



89
90
91
 
# File 'lib/glslkit/types.rb', line 89

def components_for(type)
  entry_for(type)[:components]
end

.entry_for(type) ⇒ Object 



93
94
95
 
# File 'lib/glslkit/types.rb', line 93

def entry_for(type)
  ENTRIES.fetch(type) { raise UnknownTypeError, "unknown GLSL type: #{type.inspect}" }
end

.matrix?(type) ⇒ Boolean

Returns:

  • (Boolean) 


81
82
83
 
# File 'lib/glslkit/types.rb', line 81

def matrix?(type)
  entry_for(type)[:matrix]
end

.sampler?(type) ⇒ Boolean

Returns:

  • (Boolean) 


85
86
87
 
# File 'lib/glslkit/types.rb', line 85

def sampler?(type)
  entry_for(type)[:sampler]
end

.setter_for(type) ⇒ Object 



77
78
79
 
# File 'lib/glslkit/types.rb', line 77

def setter_for(type)
  entry_for(type)[:setter]
end