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 (texture *Texture) SetMipmapSharpness(sharpness float32) {
var maxMipmapSharpness float32
gl.GetFloatv(gl.MAX_TEXTURE_LOD_BIAS, &maxMipmapSharpness)
mipmapSharpness := math.Min(math.Max(float64(sharpness), -float64(maxMipmapSharpness+0.01)), float64(maxMipmapSharpness-0.01))
bindTexture(texture.getHandle())
//negative bias is sharper
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_LOD_BIAS, -float32(mipmapSharpness))
}
func (t *Transform) update() {
gl.LoadMatrixf(&(t.parent.matrix[0]))
gl.Translatef(t.position.X, t.position.Y, 0)
gl.Rotatef(t.rotation, 0, 0, -1)
gl.GetFloatv(gl.MODELVIEW_MATRIX, &(t.parent.matrix[0]))
for _, c := range t.children {
c.update()
}
}
func (t *Transform) Update() {
var m *float32
if t.parentTransform != nil {
m = &(t.parentTransform.Matrix[0])
} else {
m = &(t.Matrix[0])
}
gl.LoadMatrixf(m)
gl.Translatef(t.position.X, t.position.Y, 0)
gl.Rotatef(t.rotation, 0, 0, -1)
gl.GetFloatv(gl.MODELVIEW_MATRIX, &(t.Matrix[0]))
t.NeedsUpdate = false
for _, c := range t.childTransforms {
c.Update()
}
}
// GetFloatv returns the float values of parameter pname.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
func GetFloatv(dst []float32, pname Enum) {
gl.GetFloatv(uint32(pname), &dst[0])
}
// 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()
}