func GetShaderBinaryFormats() (formats []ShaderBinaryFormat) {
numFormats := C.GLint(0)
C.glGetIntegerv(C.GL_NUM_SHADER_BINARY_FORMATS, &numFormats)
if numFormats > 0 {
formats = make([]ShaderBinaryFormat, numFormats)
C.glGetIntegerv(C.GL_SHADER_BINARY_FORMATS, (*C.GLint)(&formats[0]))
}
return
}
func ReadAlpha(image *image.Alpha) {
alignment := C.GLint(0)
C.glGetIntegerv(C.GL_PACK_ALIGNMENT, &alignment)
align := C.GLint(1)
for align < alignment && image.Stride%(int(align)*2) == 0 {
align *= 2
}
// need smaller alignment
if align < alignment {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, align)
}
C.glReadPixels(C.GLint(image.Rect.Min.X), C.GLint(image.Rect.Min.Y),
C.GLsizei(image.Rect.Dx()), C.GLsizei(image.Rect.Dy()),
C.GL_ALPHA, C.GL_UNSIGNED_BYTE, unsafe.Pointer(&image.Pix[0]))
// restore alignment
if align < alignment {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, alignment)
}
}
func GetIntegerv(pname Enum, data []int32) {
buf := make([]C.GLint, len(data))
C.glGetIntegerv(pname.c(), &buf[0])
for i, v := range buf {
data[i] = int32(v)
}
}
// Convenience function for glGetIntegerv
func GetInteger4(pname GLenum) (v0, v1, v2, v3 int) {
var values [4]C.GLint
C.glGetIntegerv(C.GLenum(pname), &values[0])
v0 = int(values[0])
v1 = int(values[1])
v2 = int(values[2])
v3 = int(values[3])
return
}
func GetInteger(pname Enum) (r0 int) {
defer func() {
errstr := errDrain()
log.Printf("gl.GetInteger(%v) %v%v", pname, r0, errstr)
}()
var v C.GLint
C.glGetIntegerv(pname.c(), &v)
return int(v)
}
func GetIntegerv(targ int, size int) (data []int) {
data = make([]int, 4)
var p []C.GLint = make([]C.GLint, size)
C.glGetIntegerv(C.GLenum(targ), &p[0])
for i := 0; i < size; i++ {
data[i] = int(p[i])
}
return
}
func GetIntegerv(pname Enum, data []int32) {
defer func() {
errstr := errDrain()
log.Printf("gl.GetIntegerv(%v, %v) %v", pname, data, errstr)
}()
buf := make([]C.GLint, len(data))
C.glGetIntegerv(pname.c(), &buf[0])
for i, v := range buf {
data[i] = int32(v)
}
}
func adjustUnpackAlignment(stride int) C.GLint {
alignment := C.GLint(0)
C.glGetIntegerv(C.GL_UNPACK_ALIGNMENT, &alignment)
align := C.GLint(1)
for align < alignment && stride%(int(align)*2) == 0 {
align *= 2
}
// need smaller alignment
if align < alignment {
C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, align)
// return old alignment
return alignment
} else {
return 0
}
}
func ReadRGBA(image *image.NRGBA) {
alignment := C.GLint(0)
C.glGetIntegerv(C.GL_PACK_ALIGNMENT, &alignment)
align := image.Stride % int(alignment) // align: 4 or 0
// need smaller alignment
if align > 0 {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, C.GLint(align))
}
C.glReadPixels(C.GLint(image.Rect.Min.X), C.GLint(image.Rect.Min.Y),
C.GLsizei(image.Rect.Dx()), C.GLsizei(image.Rect.Dy()),
C.GL_RGBA, C.GL_UNSIGNED_BYTE, unsafe.Pointer(&image.Pix[0]))
// restore alignment
if align > 0 {
C.glPixelStorei(C.GL_PACK_ALIGNMENT, alignment)
}
}
func GetIntegerv(
pname Enum, params *int32) {
C.glGetIntegerv(
C.GLenum(pname),
(*C.GLint)(params))
}
func GetReadFramebufferBinding() Framebuffer {
framebuffer := C.GLint(0)
C.glGetIntegerv(C.GL_READ_FRAMEBUFFER_BINDING, &framebuffer)
return Framebuffer(framebuffer)
}
func GetDrawFramebufferBinding() Framebuffer {
framebuffer := C.GLint(0)
C.glGetIntegerv(C.GL_DRAW_FRAMEBUFFER_BINDING, &framebuffer)
return Framebuffer(framebuffer)
}
func GetViewport() (int, int, int, int) {
data := [4]C.GLint{0, 0, 0, 0}
C.glGetIntegerv(C.GL_VIEWPORT, &data[0])
return int(data[0]), int(data[1]), int(data[2]), int(data[3])
}
func GetIntegerv(index uint, v1 *int) {
C.glGetIntegerv(C.GLenum(index), (*C.GLint)(Pointer(v1)))
}
func GetInteger(pname Enum) int {
var v C.GLint
C.glGetIntegerv(pname.c(), &v)
return int(v)
}
func GetIntegerv(pname uint, params []int32) []int32 {
C.glGetIntegerv(C.GLenum(pname), (*C.GLint)(¶ms[0]))
return params
}
//void glGetIntegerv (GLenum pname, int *params)
func GetIntegerv(pname GLenum, params []int32) {
if len(params) == 0 {
panic("Invalid params length")
}
C.glGetIntegerv(C.GLenum(pname), (*C.GLint)(¶ms[0]))
}
func GetActiveTexture() TextureUnit {
texture := C.GLint(0)
C.glGetIntegerv(C.GL_ACTIVE_TEXTURE, &texture)
return TextureUnit(texture)
}
func GetBoundFramebuffer() Framebuffer {
println("GetBoundFramebuffer: not yet tested (TODO: remove this after it's confirmed to work. Your feedback is welcome.)")
var b C.GLint
C.glGetIntegerv(FRAMEBUFFER_BINDING, &b)
return Framebuffer{Value: uint32(b)}
}
//void glGetIntegerv (GLenum pname, int *params)
func GetIntegerv(pname GLenum, params []int32) {
if len(params) == 0 {
panic(ErrorInputSize)
}
C.glGetIntegerv(C.GLenum(pname), (*C.GLint)(¶ms[0]))
}