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
}
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
}