Example #1
0
func RegisterShader(name string, vertex, fragment []byte) error {
	if _, ok := shader_progs[name]; ok {
		return fmt.Errorf("Tried to register a shader called '%s' twice", name)
	}

	vertex_id := gl.CreateShader(gl.VERTEX_SHADER)
	pointer := &vertex[0]
	length := int32(len(vertex))
	gl.ShaderSource(vertex_id, 1, (**uint8)(unsafe.Pointer(&pointer)), &length)
	gl.CompileShader(vertex_id)
	var param int32
	gl.GetShaderiv(vertex_id, gl.COMPILE_STATUS, &param)
	if param == 0 {
		buf := make([]byte, 5*1024)
		var length int32
		gl.GetShaderInfoLog(vertex_id, int32(len(buf)), &length, (*uint8)(unsafe.Pointer(&buf[0])))
		if length > 0 {
			length--
		}
		maxVersion := gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
		return fmt.Errorf("Failed to compile vertex shader (max version supported: %q) %q: %q", maxVersion, name, buf[0:int(length)])
	}

	fragment_id := gl.CreateShader(gl.FRAGMENT_SHADER)
	pointer = &fragment[0]
	length = int32(len(fragment))
	gl.ShaderSource(fragment_id, 1, (**uint8)(unsafe.Pointer(&pointer)), &length)
	gl.CompileShader(fragment_id)
	gl.GetShaderiv(fragment_id, gl.COMPILE_STATUS, &param)
	if param == 0 {
		buf := make([]byte, 5*1024)
		var length int32
		gl.GetShaderInfoLog(fragment_id, int32(len(buf)), &length, (*uint8)(unsafe.Pointer(&buf[0])))
		if length > 0 {
			length--
		}
		maxVersion := gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
		return fmt.Errorf("Failed to compile fragment shader (max version supported: %q) %q: %q", maxVersion, name, buf[0:int(length)])
	}

	// shader successfully compiled - now link
	program_id := gl.CreateProgram()
	gl.AttachShader(program_id, vertex_id)
	gl.AttachShader(program_id, fragment_id)
	gl.LinkProgram(program_id)
	gl.GetProgramiv(program_id, gl.LINK_STATUS, &param)
	if param == 0 {
		return fmt.Errorf("Failed to link shader '%s': %v", name, param)
	}

	shader_progs[name] = program_id
	return nil
}
Example #2
0
func compileShader(sourceFile string, shaderType uint32) (uint32, error) {
	// read shader source from file
	sourceBytes, err := ioutil.ReadFile(sourceFile)
	if err != nil {
		return 0, err
	}
	// allow use as a C string
	csource := gl.Str(string(sourceBytes) + "\x00")

	// load into OpenGL
	shader := gl.CreateShader(shaderType)
	gl.ShaderSource(shader, 1, &csource, nil)
	gl.CompileShader(shader)

	// error handling
	var status int32
	gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
	if status == gl.FALSE {
		var logLength int32
		gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)

		log := strings.Repeat("\x00", int(logLength+1))
		gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))

		return 0, fmt.Errorf("failed to compile %v: %v", sourceFile, log)
	}

	return shader, nil
}
Example #3
0
// Attempting to load a single shader.
func LoadShader(path string, shaderType uint32) (Shader, error, bool) {
	// Loading in the file contents.
	file, err := os.Open(path)
	if err != nil {
		return 0, err, false
	}
	defer file.Close()

	contentBytes, err := ioutil.ReadAll(file)
	if err != nil {
		return 0, err, false
	}
	content := gl.Str(string(contentBytes) + "\x00")

	// Creating and compiling the shader.
	shader := gl.CreateShader(shaderType)

	gl.ShaderSource(shader, 1, &content, nil)
	gl.CompileShader(shader)

	var compiled int32
	gl.GetShaderiv(shader, gl.COMPILE_STATUS, &compiled)
	if compiled == gl.FALSE {
		var length int32
		gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &length)

		log := strings.Repeat("\x00", int(length+1))
		gl.GetShaderInfoLog(shader, length, nil, gl.Str(log))

		return 0, errors.New("Shader failed to compile: " + log), true
	}

	return Shader(shader), nil, false
}
Example #4
0
func CompileShader(stype uint32, source string) (shader uint32, err error) {
	csource := gl.Str(source)
	shader = gl.CreateShader(stype)
	gl.ShaderSource(shader, 1, &csource, nil)
	gl.CompileShader(shader)
	var status int32
	if gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status); status == gl.FALSE {
		var length int32
		gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &length)
		log := strings.Repeat("\x00", int(length+1))
		gl.GetShaderInfoLog(shader, length, nil, gl.Str(log))
		err = fmt.Errorf("ERROR shader compile:\n%s", log)
	}
	return
}
Example #5
0
func compileShader(source string, shaderType uint32) (uint32, error) {
	shader := gl.CreateShader(shaderType)
	csource := gl.Str(source)
	gl.ShaderSource(shader, 1, &csource, nil)
	gl.CompileShader(shader)

	var status int32
	gl.GetShaderiv(shader, gl.COMPILE_STATUS, &status)
	if status == gl.FALSE {
		var logLength int32
		gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &logLength)

		log := strings.Repeat("\x00", int(logLength+1))
		gl.GetShaderInfoLog(shader, logLength, nil, gl.Str(log))

		return 0, fmt.Errorf("failed to compile %v: %v", source, log)
	}
	return shader, nil
}
Example #6
0
func InitShader(shader graphics.ShaderSource) (uint32, error) {

	//vertexshader
	vertexShaderHandle := gl.CreateShader(gl.VERTEX_SHADER)
	defer gl.DeleteShader(vertexShaderHandle)

	vertText := gl.Str(shader.GetVertexSource())
	gl.ShaderSource(vertexShaderHandle, 1, &vertText, nil)
	gl.CompileShader(vertexShaderHandle)
	//error handling
	var isVertexCompiled int32
	gl.GetShaderiv(vertexShaderHandle, gl.COMPILE_STATUS, &isVertexCompiled)

	if isVertexCompiled == gl.FALSE {
		var maxLength int32
		gl.GetShaderiv(vertexShaderHandle, gl.INFO_LOG_LENGTH, &maxLength)
		log := strings.Repeat("\x00", int(maxLength+1))
		gl.GetShaderInfoLog(vertexShaderHandle, maxLength, nil, gl.Str(log))
		gl.DeleteShader(vertexShaderHandle)
		fmt.Println("Vertex shader compile error")
		fmt.Println(log)
		return 0, errors.New("Vertex shader compile error")
	}

	//fragment shader
	fragmentShaderHandle := gl.CreateShader(gl.FRAGMENT_SHADER)
	defer gl.DeleteShader(fragmentShaderHandle)
	fragText := gl.Str(shader.GetFragmentSource())
	gl.ShaderSource(fragmentShaderHandle, 1, &fragText, nil)
	gl.CompileShader(fragmentShaderHandle)

	//error handling
	var isFragmentCompiled int32
	gl.GetShaderiv(fragmentShaderHandle, gl.COMPILE_STATUS, &isFragmentCompiled)

	if isFragmentCompiled == gl.FALSE {
		var maxLength int32
		gl.GetShaderiv(fragmentShaderHandle, gl.INFO_LOG_LENGTH, &maxLength)
		log := strings.Repeat("\x00", int(maxLength+1))
		gl.GetShaderInfoLog(fragmentShaderHandle, maxLength, nil, gl.Str(log))
		gl.DeleteShader(fragmentShaderHandle)
		fmt.Println("Fragment shader compile error")
		fmt.Println(log)

		return 0, errors.New("Fragment shader compile error")
	}
	//program shader
	shaderHandle := gl.CreateProgram()
	gl.AttachShader(shaderHandle, vertexShaderHandle)
	gl.AttachShader(shaderHandle, fragmentShaderHandle)
	gl.LinkProgram(shaderHandle)
	//error handling
	var isLinked int32
	gl.GetProgramiv(shaderHandle, gl.LINK_STATUS, &isLinked)
	if isLinked == gl.FALSE {
		var maxLength int32
		gl.GetProgramiv(shaderHandle, gl.INFO_LOG_LENGTH, &maxLength)
		log := strings.Repeat("\x00", int(maxLength+1))
		gl.GetProgramInfoLog(shaderHandle, maxLength, nil, gl.Str(log))
		gl.DeleteProgram(shaderHandle)

		fmt.Println("Shader linking error")
		fmt.Println(log)

		return 0, errors.New("Shader linking error")
	}
	return shaderHandle, nil
}
Example #7
0
// LoadShaderProgram loads shader objects and then attaches them to a program
func LoadShaderProgram(vertShader, fragShader string) (uint32, error) {
	// create the program
	prog := gl.CreateProgram()

	// create the vertex shader
	vs := gl.CreateShader(gl.VERTEX_SHADER)
	cVertShader, free := gl.Strs(vertShader + "\x00")
	gl.ShaderSource(vs, 1, cVertShader, nil)
	gl.CompileShader(vs)
	free()

	var status int32
	gl.GetShaderiv(vs, gl.COMPILE_STATUS, &status)
	if status == gl.FALSE {
		var logLength int32
		gl.GetShaderiv(vs, gl.INFO_LOG_LENGTH, &logLength)
		log := strings.Repeat("\x00", int(logLength+1))
		gl.GetShaderInfoLog(vs, logLength, nil, gl.Str(log))

		err := fmt.Sprintf("Failed to compile the vertex shader!\n%s", log)
		fmt.Println(err)
		return 0, errors.New(err)
	}
	defer gl.DeleteShader(vs)

	// create the fragment shader
	fs := gl.CreateShader(gl.FRAGMENT_SHADER)
	cFragShader, free := gl.Strs(fragShader + "\x00")
	gl.ShaderSource(fs, 1, cFragShader, nil)
	gl.CompileShader(fs)
	free()

	gl.GetShaderiv(fs, gl.COMPILE_STATUS, &status)
	if status == gl.FALSE {
		var logLength int32
		gl.GetShaderiv(fs, gl.INFO_LOG_LENGTH, &logLength)
		log := strings.Repeat("\x00", int(logLength+1))
		gl.GetShaderInfoLog(fs, logLength, nil, gl.Str(log))

		err := fmt.Sprintf("Failed to compile the fragment shader!\n%s", log)
		fmt.Println(err)
		return 0, errors.New(err)
	}
	defer gl.DeleteShader(fs)

	// attach the shaders to the program and link
	// attach the shaders to the program and link
	gl.AttachShader(prog, vs)
	gl.AttachShader(prog, fs)
	gl.LinkProgram(prog)

	gl.GetProgramiv(prog, gl.LINK_STATUS, &status)
	if status == gl.FALSE {
		var logLength int32
		gl.GetProgramiv(prog, gl.INFO_LOG_LENGTH, &logLength)
		log := strings.Repeat("\x00", int(logLength+1))
		gl.GetProgramInfoLog(prog, logLength, nil, gl.Str(log))

		error := fmt.Sprintf("Failed to link the program!\n%s", log)
		fmt.Println(error)
		return 0, errors.New(error)
	}

	return prog, nil
}