示例#1
0
func NewRenderer(bufferSize int) (r *Renderer, err error) {
	var (
		instance       renderInstance
		instanceStride = unsafe.Sizeof(instance)
	)
	r = &Renderer{
		shader:     core.NewProgram(),
		bufferSize: bufferSize,
		buffer:     make([]renderInstance, bufferSize),
		stride:     instanceStride,
	}
	if err = r.shader.Load(VERTEX, FRAGMENT); err != nil {
		return
	}
	r.shader.Bind()

	r.vbo = core.NewArrayBuffer()

	r.shader.Attrib("f_InstanceFrame", instanceStride).Float(unsafe.Offsetof(instance.frame), 1)
	r.shader.Attrib("m_Model", instanceStride).Mat4(unsafe.Offsetof(instance.model), 1)
	r.shader.Attrib("v_Color", instanceStride).Vec4(unsafe.Offsetof(instance.color), 1)

	r.textureData = r.shader.UniformBlock("TextureData", 1)

	r.uView = r.shader.Uniform("m_View")
	r.uProj = r.shader.Uniform("m_Projection")

	if e := gl.GetError(); e != 0 {
		err = fmt.Errorf("ERROR: OpenGL error %X", e)
	}
	return
}
示例#2
0
func NewFramerateRenderer() (r *Framerate, err error) {
	r = &Framerate{
		shader: core.NewProgram(),
		data:   newFramerateData(120),
	}
	if err = r.shader.Load(FRAMERATE_VERTEX, FRAMERATE_FRAGMENT); err != nil {
		return
	}
	r.shader.Bind()
	gl.GenBuffers(1, &r.vbo)
	gl.BindBuffer(gl.ARRAY_BUFFER, r.vbo)
	var (
		point       framerateDataPoint
		locPosition = uint32(gl.GetAttribLocation(r.shader.ID(), gl.Str("v_Position\x00")))
		offPosition = gl.PtrOffset(int(unsafe.Offsetof(point.pos)))
	)
	r.stride = int32(unsafe.Sizeof(point))
	r.locColor = gl.GetUniformLocation(r.shader.ID(), gl.Str("v_Color\x00"))
	r.locModelView = gl.GetUniformLocation(r.shader.ID(), gl.Str("m_ModelView\x00"))
	r.locProjection = gl.GetUniformLocation(r.shader.ID(), gl.Str("m_Projection\x00"))
	gl.EnableVertexAttribArray(locPosition)
	gl.VertexAttribPointer(locPosition, 2, gl.FLOAT, false, r.stride, offPosition)
	return
}