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package glfw3
//#include "glfw/include/GLFW/glfw3.h"
//GLFWmonitor* GetMonitorAtIndex(GLFWmonitor **monitors, int index);
//GLFWvidmode GetVidmodeAtIndex(GLFWvidmode *vidmodes, int index);
//void glfwSetMonitorCallbackCB();
//unsigned int GetGammaAtIndex(unsigned short *color, int i);
//void SetGammaAtIndex(unsigned short *color, int i, unsigned short value);
import "C"
import (
"unsafe"
)
type Monitor struct {
data *C.GLFWmonitor
}
// MonitorEvent corresponds to a monitor configuration event.
type MonitorEvent int
// GammaRamp describes the gamma ramp for a monitor.
type GammaRamp struct {
Red []uint16 // A slice of value describing the response of the red channel.
Green []uint16 // A slice of value describing the response of the green channel.
Blue []uint16 // A slice of value describing the response of the blue channel.
}
// Monitor events.
const (
Connected MonitorEvent = C.GLFW_CONNECTED
Disconnected MonitorEvent = C.GLFW_DISCONNECTED
)
// VideoMode describes a single video mode.
type VideoMode struct {
Width int // The width, in pixels, of the video mode.
Height int // The height, in pixels, of the video mode.
RedBits int // The bit depth of the red channel of the video mode.
GreenBits int // The bit depth of the green channel of the video mode.
BlueBits int // The bit depth of the blue channel of the video mode.
RefreshRate int // The refresh rate, in Hz, of the video mode.
}
var fMonitorHolder func(monitor *Monitor, event MonitorEvent)
//export goMonitorCB
func goMonitorCB(monitor unsafe.Pointer, event C.int) {
fMonitorHolder(&Monitor{(*C.GLFWmonitor)(monitor)}, MonitorEvent(event))
}
// GetMonitors returns a slice of handles for all currently connected monitors.
func GetMonitors() ([]*Monitor, error) {
var length int
mC := C.glfwGetMonitors((*C.int)(unsafe.Pointer(&length)))
if mC == nil {
return nil, fetchError()
}
m := make([]*Monitor, length)
for i := 0; i < length; i++ {
m[i] = &Monitor{C.GetMonitorAtIndex(mC, C.int(i))}
}
return m, nil
}
// GetPrimaryMonitor returns the primary monitor. This is usually the monitor
// where elements like the Windows task bar or the OS X menu bar is located.
func GetPrimaryMonitor() (*Monitor, error) {
m := C.glfwGetPrimaryMonitor()
if m == nil {
return nil, fetchError()
}
return &Monitor{m}, nil
}
// GetPosition returns the position, in screen coordinates, of the upper-left
// corner of the monitor.
func (m *Monitor) GetPos() (x, y int, err error) {
var xpos, ypos C.int
C.glfwGetMonitorPos(m.data, &xpos, &ypos)
return int(xpos), int(ypos), fetchError()
}
// GetPhysicalSize returns the size, in millimetres, of the display area of the
// monitor.
//
// Note: Some operating systems do not provide accurate information, either
// because the monitor's EDID data is incorrect, or because the driver does not
// report it accurately.
func (m *Monitor) GetPhysicalSize() (width, height int, err error) {
var wi, h C.int
C.glfwGetMonitorPhysicalSize(m.data, &wi, &h)
return int(wi), int(h), fetchError()
}
// GetName returns a human-readable name of the monitor, encoded as UTF-8.
func (m *Monitor) GetName() (string, error) {
mn := C.glfwGetMonitorName(m.data)
if mn == nil {
return "", fetchError()
}
return C.GoString(mn), nil
}
// SetMonitorCallback sets the monitor configuration callback, or removes the
// currently set callback. This is called when a monitor is connected to or
// disconnected from the system.
func SetMonitorCallback(cbfun func(monitor *Monitor, event MonitorEvent)) error {
if cbfun == nil {
C.glfwSetMonitorCallback(nil)
} else {
fMonitorHolder = cbfun
C.glfwSetMonitorCallbackCB()
}
return fetchError()
}
// GetVideoModes returns an array of all video modes supported by the monitor.
// The returned array is sorted in ascending order, first by color bit depth
// (the sum of all channel depths) and then by resolution area (the product of
// width and height).
func (m *Monitor) GetVideoModes() ([]*VideoMode, error) {
var length int
vC := C.glfwGetVideoModes(m.data, (*C.int)(unsafe.Pointer(&length)))
if vC == nil {
return nil, fetchError()
}
v := make([]*VideoMode, length)
for i := 0; i < length; i++ {
t := C.GetVidmodeAtIndex(vC, C.int(i))
v[i] = &VideoMode{int(t.width), int(t.height), int(t.redBits), int(t.greenBits), int(t.blueBits), int(t.refreshRate)}
}
return v, nil
}
// GetVideoMode returns the current video mode of the monitor. If you
// are using a full screen window, the return value will therefore depend on
// whether it is focused.
func (m *Monitor) GetVideoMode() (*VideoMode, error) {
t := C.glfwGetVideoMode(m.data)
if t == nil {
return nil, fetchError()
}
return &VideoMode{int(t.width), int(t.height), int(t.redBits), int(t.greenBits), int(t.blueBits), int(t.refreshRate)}, nil
}
// SetGamma generates a 256-element gamma ramp from the specified exponent and then calls
// SetGamma with it.
func (m *Monitor) SetGamma(gamma float32) error {
C.glfwSetGamma(m.data, C.float(gamma))
return fetchError()
}
// GetGammaRamp retrieves the current gamma ramp of the monitor.
func (m *Monitor) GetGammaRamp() (*GammaRamp, error) {
var ramp GammaRamp
rampC := C.glfwGetGammaRamp(m.data)
if rampC == nil {
return nil, fetchError()
}
length := int(rampC.size)
ramp.Red = make([]uint16, length)
ramp.Green = make([]uint16, length)
ramp.Blue = make([]uint16, length)
for i := 0; i < length; i++ {
ramp.Red[i] = uint16(C.GetGammaAtIndex(rampC.red, C.int(i)))
ramp.Green[i] = uint16(C.GetGammaAtIndex(rampC.green, C.int(i)))
ramp.Blue[i] = uint16(C.GetGammaAtIndex(rampC.blue, C.int(i)))
}
return &ramp, nil
}
// SetGammaRamp sets the current gamma ramp for the monitor.
func (m *Monitor) SetGammaRamp(ramp *GammaRamp) error {
var rampC C.GLFWgammaramp
length := len(ramp.Red)
for i := 0; i < length; i++ {
C.SetGammaAtIndex(rampC.red, C.int(i), C.ushort(ramp.Red[i]))
C.SetGammaAtIndex(rampC.green, C.int(i), C.ushort(ramp.Green[i]))
C.SetGammaAtIndex(rampC.blue, C.int(i), C.ushort(ramp.Blue[i]))
}
C.glfwSetGammaRamp(m.data, &rampC)
return fetchError()
}
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