func initMaxValues() {
gl_state.framebufferSRGBEnabled = gl.IsEnabled(gl.FRAMEBUFFER_SRGB)
gl.GetFloatv(gl.POINT_SIZE, &states.back().pointSize)
gl.GetFloatv(gl.MAX_TEXTURE_MAX_ANISOTROPY_EXT, &maxAnisotropy)
gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, &maxTextureSize)
gl.GetIntegerv(gl.MAX_SAMPLES, &maxRenderbufferSamples)
gl.GetIntegerv(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits)
gl_state.textureCounters = make([]int, maxTextureUnits)
gl.GetIntegerv(gl.MAX_DRAW_BUFFERS, &maxRenderTargets)
var maxattachments int32
gl.GetIntegerv(gl.MAX_COLOR_ATTACHMENTS, &maxattachments)
if maxattachments < maxRenderTargets {
maxRenderTargets = maxattachments
}
}
func (c *Context) Reset() error {
if err := c.runOnContextThread(func() error {
if c.init {
return nil
}
// Note that this initialization must be done after Loop is called.
if err := gl.Init(); err != nil {
return fmt.Errorf("opengl: initializing error %v", err)
}
c.init = true
return nil
}); err != nil {
return nil
}
c.locationCache = newLocationCache()
c.lastTexture = invalidTexture
c.lastFramebuffer = invalidFramebuffer
c.lastViewportWidth = 0
c.lastViewportHeight = 0
c.lastCompositeMode = CompositeModeUnknown
if err := c.runOnContextThread(func() error {
gl.Enable(gl.BLEND)
return nil
}); err != nil {
return err
}
c.BlendFunc(CompositeModeSourceOver)
if err := c.runOnContextThread(func() error {
f := int32(0)
gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, &f)
c.screenFramebuffer = Framebuffer(f)
return nil
}); err != nil {
return err
}
return nil
}
// GetBoundFramebuffer returns the currently bound framebuffer.
// Use this method instead of gl.GetInteger(gl.FRAMEBUFFER_BINDING) to
// enable support on all platforms
func GetBoundFramebuffer() Framebuffer {
var b int32
gl.GetIntegerv(FRAMEBUFFER_BINDING, &b)
return Framebuffer{Value: uint32(b)}
}
// GetInteger returns the int value of parameter pname.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
func GetInteger(pname Enum) int {
var data int32
gl.GetIntegerv(uint32(pname), &data)
return int(data)
}
// GetIntegerv returns the int values of parameter pname.
//
// Single values may be queried more easily using GetInteger.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
func GetIntegerv(pname Enum, data []int32) {
gl.GetIntegerv(uint32(pname), &data[0])
}
func (c *Context) GetViewport() [4]int32 {
var params [4]int32
gl.GetIntegerv(gl.VIEWPORT, ¶ms[0])
return params
}
// Printf draws the given string at the specified coordinates.
// It expects the string to be a single line. Line breaks are not
// handled as line breaks and are rendered as glyphs.
//
// In order to render multi-line text, it is up to the caller to split
// the text up into individual lines of adequate length and then call
// this method for each line seperately.
func (f *Font) Printf(x, y float32, fs string, argv ...interface{}) error {
indices := []rune(fmt.Sprintf(fs, argv...))
if len(indices) == 0 {
return nil
}
// Runes form display list indices.
// For this purpose, they need to be offset by -FontConfig.Low
low := f.config.Low
for i := range indices {
indices[i] -= low
}
var vp [4]int32
gl.GetIntegerv(gl.VIEWPORT, &vp[0])
gl.PushAttrib(gl.TRANSFORM_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.PushMatrix()
gl.LoadIdentity()
gl.Ortho(float64(vp[0]), float64(vp[2]), float64(vp[1]), float64(vp[3]), 0, 1)
gl.PopAttrib()
gl.PushAttrib(gl.LIST_BIT | gl.CURRENT_BIT | gl.ENABLE_BIT | gl.TRANSFORM_BIT)
{
gl.MatrixMode(gl.MODELVIEW)
gl.Disable(gl.LIGHTING)
gl.Disable(gl.DEPTH_TEST)
gl.Enable(gl.BLEND)
gl.Enable(gl.TEXTURE_2D)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
gl.BindTexture(gl.TEXTURE_2D, f.texture)
gl.ListBase(f.listbase)
var mv [16]float32
gl.GetFloatv(gl.MODELVIEW_MATRIX, &mv[0])
gl.PushMatrix()
{
gl.LoadIdentity()
mgw := float32(f.maxGlyphWidth)
mgh := float32(f.maxGlyphHeight)
switch f.config.Dir {
case LeftToRight, TopToBottom:
gl.Translatef(x, float32(vp[3])-y-mgh, 0)
case RightToLeft:
gl.Translatef(x-mgw, float32(vp[3])-y-mgh, 0)
}
gl.MultMatrixf(&mv[0])
gl.CallLists(int32(len(indices)), gl.UNSIGNED_INT, unsafe.Pointer(&indices[0]))
}
gl.PopMatrix()
gl.BindTexture(gl.TEXTURE_2D, 0)
}
gl.PopAttrib()
gl.PushAttrib(gl.TRANSFORM_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.PopMatrix()
gl.PopAttrib()
return checkGLError()
}
