mirror of
https://github.com/cyberarm/i-mic-fps.git
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127 lines
3.6 KiB
Ruby
127 lines
3.6 KiB
Ruby
class IMICFPS
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# Ref: https://github.com/vaiorabbit/ruby-opengl/blob/master/sample/OrangeBook/brick.rb
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class Shader
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include OpenGL
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def initialize(name:, vertex_file:, fragment_file:)
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@name = name
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@vertex_file = vertex_file
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@fragment_file = fragment_file
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@compiled = false
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@error_buffer_size = 1024
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@variable_missing = {}
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create_shaders
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compile_shaders
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# Only add shader to ShaderManager if it successfully compiles
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if @compiled
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ShaderManager.add_shader(@name, self)
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else
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puts "FAILED to compile shader: #{@name}", ""
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end
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end
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def shader_files_exist?
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File.exists?(@vertex_file) && File.exists?(@fragment_file)
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end
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def create_shaders
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return unless shader_files_exist?
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@vertex = glCreateShader(GL_VERTEX_SHADER)
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@fragment = glCreateShader(GL_FRAGMENT_SHADER)
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source = [File.read(@vertex_file)].pack('p')
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size = [File.size(@vertex_file)].pack('I')
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glShaderSource(@vertex, 1, source, size)
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source = [File.read(@fragment_file)].pack('p')
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size = [File.size(@fragment_file)].pack('I')
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glShaderSource(@fragment, 1, source, size)
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end
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def compile_shaders
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return unless shader_files_exist?
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glCompileShader(@vertex)
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buffer = ' '
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glGetShaderiv(@vertex, GL_COMPILE_STATUS, buffer)
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compiled = buffer.unpack('L')[0]
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if compiled == 0
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log = ' ' * @error_buffer_size
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glGetShaderInfoLog(@vertex, @error_buffer_size, nil, log)
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puts "Shader Error: Program \"#{@name}\""
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puts " Vertex Shader InfoLog:", " #{log.strip.split("\n").join("\n ")}\n\n"
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puts " Shader Compiled status: #{compiled}"
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puts " NOTE: assignment of uniforms in shaders is illegal!"
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puts
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return
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end
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glCompileShader(@fragment)
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buffer = ' '
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glGetShaderiv(@fragment, GL_COMPILE_STATUS, buffer)
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compiled = buffer.unpack('L')[0]
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if compiled == 0
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log = ' ' * @error_buffer_size
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glGetShaderInfoLog(@fragment, @error_buffer_size, nil, log)
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puts "Shader Error: Program \"#{@name}\""
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puts " Fragment Shader InfoLog:", " #{log.strip.split("\n").join("\n ")}\n\n"
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puts " Shader Compiled status: #{compiled}"
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puts " NOTE: assignment of uniforms in shader is illegal!"
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puts
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return
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end
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@program = glCreateProgram
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glAttachShader(@program, @vertex)
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glAttachShader(@program, @fragment)
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glLinkProgram(@program)
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buffer = ' '
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glGetProgramiv(@program, GL_LINK_STATUS, buffer)
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linked = buffer.unpack('L')[0]
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if linked == 0
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log = ' ' * @error_buffer_size
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glGetProgramInfoLog(@program, @error_buffer_size, nil, log)
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puts "Shader Error: Program \"#{@name}\""
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puts " Program InfoLog:", " #{log.strip.split("\n").join("\n ")}\n\n"
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end
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@compiled = linked == 0 ? false : true
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end
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# Returns the location of a uniform variable
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def variable(variable)
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loc = glGetUniformLocation(@program, variable)
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if (loc == -1)
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puts "Shader Error: Program \"#{@name}\" has no such uniform named \"#{variable}\"", " Is it used in the shader? GLSL may have optimized it out.", " Is it miss spelled?" unless @variable_missing[variable]
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@variable_missing[variable] = true
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end
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return loc
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end
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def use(&block)
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return unless compiled?
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glUseProgram(@program)
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if block
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block.call(self)
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stop
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end
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end
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def stop
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glUseProgram(0)
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end
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def compiled?
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@compiled
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end
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end
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end |