Example #1
0
File: gg.go Project: dmac/gg
func (*backend) LinkProgram(p *gg.Program) error {
	pv := p.Value.(uint32)
	gl.LinkProgram(pv)
	var status int32
	gl.GetProgramiv(pv, gl.LINK_STATUS, &status)
	if status == gl.TRUE {
		return nil
	}
	var logLength int32
	gl.GetProgramiv(pv, gl.INFO_LOG_LENGTH, &logLength)
	log := strings.Repeat("\x00", int(logLength+1))
	gl.GetProgramInfoLog(pv, logLength, nil, gl.Str(log))
	return fmt.Errorf("link program: %s", log)
}
Example #2
0
func (s *Shader) compile() error {
	gl.LinkProgram(s.program)
	var result int32
	gl.GetProgramiv(s.program, gl.LINK_STATUS, &result)
	if result == 0 {
		return s.getProgramInfoLog("shader compilation error")
	}
	gl.ValidateProgram(s.program)
	gl.GetProgramiv(s.program, gl.VALIDATE_STATUS, &result)
	if result == 0 {
		return s.getProgramInfoLog("shader compilation error: %s")
	}

	return nil
}
Example #3
0
func initResources() (uint32, int32) {
	vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
	fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)

	var linkOk int32
	program := gl.CreateProgram()
	gl.AttachShader(program, vs)
	gl.AttachShader(program, fs)
	gl.LinkProgram(program)
	gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
	if linkOk == 0 {
		log.Fatal("gl.LinkProgram")
	}

	gl.GenBuffers(1, &vboTriangle)
	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
	gl.BufferData(gl.ARRAY_BUFFER, 4*len(triangleVertices), gl.Ptr(triangleVertices), gl.STATIC_DRAW)

	attribName := "coord2d\x00"
	attribCoord2d := gl.GetAttribLocation(program, gl.Str(attribName))
	if attribCoord2d == -1 {
		log.Fatal("failed to bind attribute")
	}
	return program, attribCoord2d
}
Example #4
0
func initResources() uint32 {
	vs := CreateShader("triangle.v.glsl", gl.VERTEX_SHADER)
	fs := CreateShader("triangle.f.glsl", gl.FRAGMENT_SHADER)

	var linkOk int32
	program := gl.CreateProgram()
	gl.AttachShader(program, vs)
	gl.AttachShader(program, fs)
	gl.LinkProgram(program)
	gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
	if linkOk == 0 {
		log.Fatal("gl.LinkProgram")
	}

	gl.GenBuffers(1, &vboTriangle)
	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
	gl.BufferData(gl.ARRAY_BUFFER, floatSize*len(triangleAttributes), gl.Ptr(triangleAttributes), gl.STATIC_DRAW)

	attributeCoord2d = gl.GetAttribLocation(program, gl.Str("coord2d\x00"))
	if attributeCoord2d == -1 {
		log.Fatal("failed to bind attribute")
	}

	attributeVColor = gl.GetAttribLocation(program, gl.Str("v_color\x00"))
	if attributeVColor == -1 {
		log.Fatal("could not bind attribute v_color")
	}

	uniformFade = gl.GetUniformLocation(program, gl.Str("fade\x00"))
	if uniformFade == -1 {
		log.Fatal("could not bind uniform fade")
	}

	return program
}
Example #5
0
func (s *Shader) getProgramInfoLog(context string) error {
	var logLength int32
	gl.GetProgramiv(s.program, gl.INFO_LOG_LENGTH, &logLength)

	log := strings.Repeat("\x00", int(logLength+1))
	gl.GetProgramInfoLog(s.program, logLength, nil, gl.Str(log))

	return fmt.Errorf("%s: %s", context, log)
}
Example #6
0
func (s *Shader) getProgramInfoLog(context string) error {
	var logLength int32
	gl.GetProgramiv(s.program, gl.INFO_LOG_LENGTH, &logLength)

	cLog, free := gl.Strs(strings.Repeat("\x00", int(logLength+1)))
	defer free()
	gl.GetProgramInfoLog(s.program, logLength, nil, *cLog)

	return fmt.Errorf("%s: %s", context, cLog)
}
Example #7
0
// GetProgramInfoLog returns the information log for a program.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramInfoLog.xhtml
func GetProgramInfoLog(p Program) string {
	var logLength int32
	gl.GetProgramiv(p.Value, gl.INFO_LOG_LENGTH, &logLength)
	if logLength == 0 {
		return ""
	}

	logBuffer := make([]uint8, logLength)
	gl.GetProgramInfoLog(p.Value, logLength, nil, &logBuffer[0])
	return gl.GoStr(&logBuffer[0])
}
Example #8
0
func NewProgram(vertexSource, fragmentSource string) (*Program, error) {
	vertexId, err := newShader(vertexSource, gl.VERTEX_SHADER)
	if err != nil {
		return nil, err
	}
	fragmentId, err := newShader(fragmentSource, gl.FRAGMENT_SHADER)
	if err != nil {
		gl.DeleteShader(vertexId)
		return nil, err
	}
	id := gl.CreateProgram()
	if id == 0 {
		gl.DeleteShader(vertexId)
		gl.DeleteShader(fragmentId)
		return nil, fmt.Errorf("Unable to allocate program")
	}
	gl.AttachShader(id, vertexId)
	gl.AttachShader(id, fragmentId)
	gl.LinkProgram(id)
	var result int32
	gl.GetProgramiv(id, gl.LINK_STATUS, &result)
	if result == int32(gl.FALSE) {
		var loglength int32
		gl.GetProgramiv(id, gl.INFO_LOG_LENGTH, &loglength)
		log := make([]byte, loglength)
		var length int32
		gl.GetProgramInfoLog(id, loglength, &length, &log[0])
		gl.DeleteShader(vertexId)
		gl.DeleteShader(fragmentId)
		gl.DeleteProgram(id)
		return nil, fmt.Errorf("Unable to link program: %s", log[:length])
	}

	return &Program{
		id:       id,
		vertId:   vertexId,
		fragId:   fragmentId,
		uniforms: uniforms(id),
	}, nil
}
Example #9
0
func uniforms(id uint32) map[string]Uniform {
	var maxlength int32
	gl.GetProgramiv(id, gl.ACTIVE_UNIFORM_MAX_LENGTH, &maxlength)
	var numuniforms int32
	gl.GetProgramiv(id, gl.ACTIVE_UNIFORMS, &numuniforms)
	buf := make([]byte, maxlength)
	m := make(map[string]Uniform)
	for index := uint32(0); index < uint32(numuniforms); index++ {
		name, dt, siz := uniform(id, index, buf)
		loc := gl.GetUniformLocation(id, &buf[0])
		if loc == -1 {
			panic(fmt.Errorf("Expected location for indexed uniform '%s'", name))
		}
		m[name] = Uniform{
			name:     name,
			location: loc,
			typ:      dt,
			siz:      siz,
		}
	}
	return m
}
Example #10
0
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
	p := gl.CreateProgram()
	if p == 0 {
		return 0, errors.New("glCreateProgram failed")
	}

	for _, shader := range shaders {
		gl.AttachShader(p, uint32(shader))
	}
	gl.LinkProgram(p)
	var v int32
	gl.GetProgramiv(p, gl.LINK_STATUS, &v)
	if v == gl.FALSE {
		return 0, errors.New("program error")
	}
	return Program(p), nil
}
Example #11
0
// PrintLog prints the error log for an object
func PrintLog(object uint32) {
	var logLength int32
	if gl.IsShader(object) {
		gl.GetShaderiv(object, gl.INFO_LOG_LENGTH, &logLength)
	} else if gl.IsProgram(object) {
		gl.GetProgramiv(object, gl.INFO_LOG_LENGTH, &logLength)
	} else {
		log.Fatal("PrintLog: not a shader or program")
	}

	infoLog := strings.Repeat("\x00", int(logLength+1))
	if gl.IsShader(object) {
		gl.GetShaderInfoLog(object, logLength, nil, gl.Str(infoLog))
	} else if gl.IsProgram(object) {
		gl.GetProgramInfoLog(object, logLength, nil, gl.Str(infoLog))
	}
	log.Fatal(infoLog)
}
Example #12
0
func createProgram(vertShaderSrc string, fragShaderSrc string) uint32 {
	vertShader := loadShader(gl.VERTEX_SHADER, vertShaderSrc)
	fragShader := loadShader(gl.FRAGMENT_SHADER, fragShaderSrc)

	prog := gl.CreateProgram()

	gl.AttachShader(prog, vertShader)
	gl.AttachShader(prog, fragShader)
	gl.LinkProgram(prog)

	var status int32
	gl.GetProgramiv(prog, gl.LINK_STATUS, &status)
	if status != gl.TRUE {
		//log := gl.GetInfoLogARB(prog)
		panic(fmt.Errorf("Failed to link program: , "))
	}

	return prog
}
Example #13
0
func initResources() (uint32, int32) {
	vSrc0 := fixupSrc(vShaderSrc)
	vSrc := gl.Str(vSrc0)
	vs := gl.CreateShader(gl.VERTEX_SHADER)
	gl.ShaderSource(vs, 1, &vSrc, nil)
	gl.CompileShader(vs)
	var vok int32
	gl.GetShaderiv(vs, gl.COMPILE_STATUS, &vok)
	if vok == 0 {
		log.Fatal("error in vertex shader")

	}

	fSrc := gl.Str(fShaderSrc)
	fs := gl.CreateShader(gl.FRAGMENT_SHADER)
	gl.ShaderSource(fs, 1, &fSrc, nil)
	gl.CompileShader(fs)
	var fok int32
	gl.GetShaderiv(vs, gl.COMPILE_STATUS, &fok)
	if fok == 0 {
		log.Fatal("error in fragment shader")

	}

	var linkOk int32
	program := gl.CreateProgram()
	gl.AttachShader(program, vs)
	gl.AttachShader(program, fs)
	gl.LinkProgram(program)
	gl.GetProgramiv(program, gl.LINK_STATUS, &linkOk)
	if linkOk == 0 {
		log.Fatal("gl.LinkProgram")
	}

	attribName := fixupSrc("coord2d")
	attribCoord2d := gl.GetAttribLocation(program, gl.Str(attribName))
	if attribCoord2d == -1 {
		log.Fatal("failed to bind attribute")
	}
	return program, attribCoord2d
}
Example #14
0
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
	var program Program
	if err := c.runOnContextThread(func() error {
		p := gl.CreateProgram()
		if p == 0 {
			return errors.New("opengl: glCreateProgram failed")
		}

		for _, shader := range shaders {
			gl.AttachShader(p, uint32(shader))
		}
		gl.LinkProgram(p)
		var v int32
		gl.GetProgramiv(p, gl.LINK_STATUS, &v)
		if v == gl.FALSE {
			return errors.New("opengl: program error")
		}
		program = Program(p)
		return nil
	}); err != nil {
		return 0, err
	}
	return program, nil
}
Example #15
0
// GetProgrami returns a parameter value for a program.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramiv.xhtml
func GetProgrami(p Program, pname Enum) int {
	var result int32
	gl.GetProgramiv(p.Value, uint32(pname), &result)
	return int(result)
}