Class: Mittsu::OpenGLState

Inherits:
Object
  • Object
show all
Defined in:
lib/mittsu/renderers/opengl/opengl_state.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ OpenGLState

Returns a new instance of OpenGLState.



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 3

def initialize
  @new_attributes = Array.new(16) # Uint8Array
  @enabled_attributes = Array.new(16) # Uint8Array

  @current_blending = nil
  @current_blend_equation = nil
  @current_blend_src = nil
  @current_blend_dst = nil
  @current_blend_equation_alpha = nil
  @current_blend_src_alpha = nil
  @current_blend_dst_alpha = nil

  @current_depth_test = nil
  @current_depth_write = nil

  @current_color_write = nil

  @current_double_sided = nil
  @current_flip_sided = nil

  @current_line_width = nil

  @current_polygon_offset = nil
  @current_polygon_offset_factor = nil
  @current_polygon_offset_units = nil
end

Instance Method Details

#disable_unused_attributes ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 46

def disable_unused_attributes
  @enabled_attributes.length.times do |i|
    if @enabled_attributes[i] && !@new_attributes[i]
      glDisableVertexAttribArray(i)
      @enabled_attributes[i] = false
    end
  end
end

#enable_attribute(attribute) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 36

def enable_attribute(attribute)
  glEnableVertexAttribArray(attribute)
  @new_attributes[attribute] = true

  if !@enabled_attributes[attribute]
    # glEnableVertexAttribArray(attribute)
    @enabled_attributes[attribute] = true
  end
end

#init_attributes ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 30

def init_attributes
  @new_attributes.length.times do |i|
    @new_attributes[i] = false
  end
end

#reset ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 192

def reset
  @enabled_attributes.length.times do |i|
    @enabled_attributes[i] = false
  end

  @current_blending = nil
  @current_depth_test = nil
  @current_depth_write = nil
  @current_color_write = nil
  @current_double_sided = nil
  @current_flip_sided = nil
end

#set_blending(blending, blend_equation = nil, blend_src = nil, blend_dst = nil, blend_equation_alpha = nil, blend_src_alpha = nil, blend_dst_alpha = nil) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 55

def set_blending(blending, blend_equation = nil, blend_src = nil, blend_dst = nil, blend_equation_alpha = nil, blend_src_alpha = nil, blend_dst_alpha = nil)
  if blending != @current_blending
    case blending
    when NoBlending
      glDisable(GL_BLEND)
    when AdditiveBlending
      glEnable(GL_BLEND)
      glBlendEquation(GL_FUNC_ADD)
      glBlendFunc(GL_SRC_ALPHA, GL_ONE)
    when SubtractiveBlending
      # TODO: Find blendFuncSeparate() combination ???
      glEnable(GL_BLEND)
      glBlendEquation(GL_FUNC_ADD)
      glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR)
    when MultiplyBlending
      # TODO: Find blendFuncSeparate() combination ???
      glEnable(GL_BLEND)
      glBlendEquation(GL_FUNC_ADD)
      glBlendFunc(GL_ZERO, GL_ONE_MINUS_SRC_COLOR)
    when CustomBlending
      glEnable(GL_BLEND)
    else
      glEnable(GL_BLEND)
      glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD)
      glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA)
    end

    @current_blending = blending
  end

  if blending == CustomBlending
    blend_equation_alpha ||= blend_equation
    blend_src_alpha ||= blend_src
    blend_dst_alpha ||= blend_dst

    if blend_equation != @current_blend_equation || blend_equation_alpha != @current_blend_equation_alpha
      glBlendEquationSeparate(GL_MITTSU_PARAMS[blend_equation], GL_MITTSU_PARAMS[blend_equation_alpha])

      @current_blend_equation = blend_equation
      @current_blend_equation_alpha = blend_equation_alpha
    end

    if blend_src != @current_blend_src || blend_dst != @current_blend_dst || blend_src_alpha != @current_blend_src_alpha || blend_dst_alpha != @current_blend_dst_alpha
      glBlendFuncSeparate(GL_MITTSU_PARAMS[blend_src], GL_MITTSU_PARAMS[blend_dst], GL_MITTSU_PARAMS[blend_src_alpha], GL_MITTSU_PARAMS[blend_dst_alpha])

      @current_blend_src = nil
      @current_blend_dst = nil
      @current_blend_src_alpha = nil
      @current_blend_dst_alpha = nil
    end
  else
    @current_blend_equation = nil
    @current_blend_src = nil
    @current_blend_dst = nil
    @current_blend_equation_alpha = nil
    @current_blend_src_alpha = nil
    @current_blend_dst_alpha = nil
  end
end

#set_color_write(color_write) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 134

def set_color_write(color_write)
  if @current_color_write != color_write
    gl_color_write = color_write ? GL_TRUE : GL_FALSE
    glColorMask(gl_color_write, gl_color_write, gl_color_write, gl_color_write)
    @current_color_write = color_write
  end
end

#set_depth_test(depth_test) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 115

def set_depth_test(depth_test)
  if @current_depth_test != depth_test
    if depth_test
      glEnable(GL_DEPTH_TEST)
    else
      glDisable(GL_DEPTH_TEST)
    end

    @current_depth_test = depth_test
  end
end

#set_depth_write(depth_write) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 127

def set_depth_write(depth_write)
  if @current_depth_write != depth_write
    glDepthMask(depth_write ? GL_TRUE : GL_FALSE)
    @current_depth_write = depth_write
  end
end

#set_double_sided(double_sided) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 142

def set_double_sided(double_sided)
  if @current_double_sided != double_sided
    if double_sided
      glDisable(GL_CULL_FACE)
    else
      glEnable(GL_CULL_FACE)
    end

    @current_double_sided = double_sided
  end
end

#set_flip_sided(flip_sided) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 154

def set_flip_sided(flip_sided)
  if @current_flip_sided != flip_sided
    if flip_sided
      glFrontFace(GL_CW)
    else
      glFrontFace(GL_CCW)
    end

    @current_flip_sided = flip_sided
  end
end

#set_line_width(width) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 166

def set_line_width(width)
  if width != @current_line_width
    glLineWidth(width)
    @current_line_width = width
  end
end

#set_polygon_offset(polygon_offset, factor, units) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/opengl_state.rb', line 173

def set_polygon_offset(polygon_offset, factor, units)
  if @current_polygon_offset != polygon_offset
    if polygon_offset
      glEnable(GL_POLYGON_OFFSET_FILL)
    else
      glDisable(GL_POLYGON_OFFSET_FILL)
    end

    @current_polygon_offset = polygon_offset
  end

  if polygon_offset && (@current_polygon_offset_factor != factor || @current_polygon_offset_units != units)
    glPolygonOffset(factor, units)

    @current_polygon_offset_factor = factor
    @current_polygon_offset_units = units
  end
end