Class: RBGLox::Shader

Inherits:
Resource show all
Includes:
Gl
Defined in:
lib/rbglox/shader.rb

Overview

GLSL Shader Class

Instance Attribute Summary collapse

Attributes inherited from Resource

#id

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ Shader

Constructor



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# File 'lib/rbglox/shader.rb', line 8

def initialize(filename)
  @filename = filename
  @id = glCreateProgram

@vertex = glCreateShader GL_VERTEX_SHADER
  glAttachShader id, vertex

  @fragment = glCreateShader GL_FRAGMENT_SHADER
  glAttachShader id, fragment

  @uniforms = []

  reload
end

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/rbglox/shader.rb', line 5

def filename
  @filename
end

#fragment ⇒ Object (readonly)

Returns the value of attribute fragment.



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# File 'lib/rbglox/shader.rb', line 5

def fragment
  @fragment
end

#uniforms ⇒ Object (readonly)

Returns the value of attribute uniforms.



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# File 'lib/rbglox/shader.rb', line 5

def uniforms
  @uniforms
end

#vertex ⇒ Object (readonly)

Returns the value of attribute vertex.



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# File 'lib/rbglox/shader.rb', line 5

def vertex
  @vertex
end

Instance Method Details

#[]=(name, value) ⇒ Object

Set internal GLSL uniforms



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# File 'lib/rbglox/shader.rb', line 24

def []=(name, value)
  loc = glGetUniformLocation id, name
  if value.is_a? Float
    glUniform1f loc, value
  elsif value.is_a? Integer
    glUniform1i loc, value
  elsif value.is_a? Array
    l = value.size
  	if l == 2
		glUniform2fv loc, value
	elsif l == 3
		glUniform3fv loc, value
	elsif l == 4
		glUniform4fv loc, value
    end
  else
    raise TypeError.new('Uniform type not supported')
  end
end

#bind ⇒ Object

Bind the Shader



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# File 'lib/rbglox/shader.rb', line 45

def bind
  glUseProgram id
  
  uniforms.each do |k, v|
    self[k] = v
  end
end

#free ⇒ Object

Free the Shader



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# File 'lib/rbglox/shader.rb', line 87

def free
  glDetachShader id, vertex
  glDeleteShader vertex

  glDetachShader id, fragment
  glDeleteShader fragment

  glDeleteProgram id
end

#release ⇒ Object

Release the Shader



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# File 'lib/rbglox/shader.rb', line 54

def release
  glUseProgram 0
end

#reload ⇒ Object

Reload the Shader



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# File 'lib/rbglox/shader.rb', line 59

def reload
  content = File.read filename
  vert, frag, unis = parse content

  glShaderSource vertex, vert
  glCompileShader vertex
  log = glGetShaderInfoLog vertex
  puts log

  return if log =~ /error/i

  glShaderSource fragment, frag
  glCompileShader fragment
  log = glGetShaderInfoLog fragment
  puts log

  return if log =~ /error/i

glLinkProgram id
  log = glGetProgramInfoLog id
  puts log

  return if log =~ /error/i

  @uniforms = unis
end