Documentation
¶
Index ¶
- Constants
- func ColorClamp(enable bool)
- func DestroyContext(ctx Context)
- func GetColorBuffer(c Context, width *int, height *int, format *Format, buffer *unsafe.Pointer)
- func GetDepthBuffer(c Context, width *int, height *int, bytesPerValue *int, buffer *unsafe.Pointer)
- func GetIntegerv(pname PropertyName) int
- func MakeCurrent(ctx Context, buffer unsafe.Pointer, type_ PixelType, width int, height int) bool
- func PixelStore(pname PixelStoreParameter, value int)
- type Context
- type Format
- type PixelStoreParameter
- type PixelType
- type PropertyName
Constants ¶
const (
UNSIGNED_BYTE = gl.UNSIGNED_BYTE
)
Variables ¶
This section is empty.
Functions ¶
func ColorClamp ¶
func ColorClamp(enable bool)
*
- Enable/disable color clamping, off by default.
- New in Mesa 6.4.2
func DestroyContext ¶
func DestroyContext(ctx Context)
* Destroy an Off-Screen Mesa rendering context. * * Input: ctx - the context to destroy
func GetColorBuffer ¶
* Return the color buffer associated with an OSMesa context. * Input: c - the OSMesa context * Output: width, height - size of buffer in pixels * format - buffer format (OSMESA_FORMAT) * buffer - pointer to depth buffer values * Return: GL_TRUE or GL_FALSE to indicate success or failure. * * New in Mesa 3.3.
func GetDepthBuffer ¶
* Return the depth buffer associated with an OSMesa context. * Input: c - the OSMesa context * Output: width, height - size of buffer in pixels * bytesPerValue - bytes per depth value (2 or 4) * buffer - pointer to depth buffer values * Return: GL_TRUE or GL_FALSE to indicate success or failure. * * New in Mesa 2.4.
func GetIntegerv ¶
func GetIntegerv(pname PropertyName) int
* Return an integer value like glGetIntegerv. * Input: pname - * OSMESA_WIDTH return current image width * OSMESA_HEIGHT return current image height * OSMESA_FORMAT return image format * OSMESA_TYPE return color component data type * OSMESA_ROW_LENGTH return row length in pixels * OSMESA_Y_UP returns 1 or 0 to indicate Y axis direction * value - pointer to integer in which to return result.
func MakeCurrent ¶
* Bind an osmesa.Context to an image buffer. The image buffer is just a * block of memory which the client provides. Its size must be at least * as large as width*height*sizeof(type). Its address should be a multiple * of 4 if using RGBA mode. * * Image data is stored in the order of glDrawPixels: row-major order * with the lower-left image pixel stored in the first array position * (ie. bottom-to-top). * * Since the only type initially supported is GL_UNSIGNED_BYTE, if the * context is in RGBA mode, each pixel will be stored as a 4-byte RGBA * value. If the context is in color indexed mode, each pixel will be * stored as a 1-byte value. * * If the context's viewport hasn't been initialized yet, it will now be * initialized to (0,0,width,height). * * Input: ctx - the rendering context * buffer - the image buffer memory * type - data type for pixel components, only GL_UNSIGNED_BYTE * supported now * width, height - size of image buffer in pixels, at least 1 * Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx, * invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1, * width>internal limit or height>internal limit.
func PixelStore ¶
func PixelStore(pname PixelStoreParameter, value int)
* Set pixel store/packing parameters for the current context. * This is similar to glPixelStore. * Input: pname - OSMESA_ROW_LENGTH * specify actual pixels per row in image buffer * 0 = same as image width (default) * OSMESA_Y_UP * zero = Y coordinates increase downward * non-zero = Y coordinates increase upward (default) * value - the value for the parameter pname * * New in version 2.0.
Types ¶
type Context ¶
type Context C.OSMesaContext
func CreateContext ¶
* Create an Off-Screen Mesa rendering context. The only attribute needed is * an RGBA vs Color-Index mode flag. * * Input: format - one of OSMESA_COLOR_INDEX, OSMESA_RGBA, OSMESA_BGRA, * OSMESA_ARGB, OSMESA_RGB, or OSMESA_BGR. * sharelist - specifies another osmesa.Context with which to share * display lists. NULL indicates no sharing. * Return: an osmesa.Context or 0 if error
func CreateContextExt ¶
func CreateContextExt(format Format, depthBits int, stencilBits int, accumBits int, sharelist Context) Context
* Create an Off-Screen Mesa rendering context and specify desired * size of depth buffer, stencil buffer and accumulation buffer. * If you specify zero for depthBits, stencilBits, accumBits you * can save some memory. * * New in Mesa 3.5
func GetCurrentContext ¶
func GetCurrentContext() Context
* Return the current Off-Screen Mesa rendering context handle.
type PixelStoreParameter ¶
type PixelStoreParameter int
const ( ROW_LENGTH PixelStoreParameter = 0x10 Y_UP PixelStoreParameter = 0x11 )
* OSMesaPixelStore() parameters: * New in version 2.0.
type PropertyName ¶
type PropertyName int
* Accepted by OSMesaGetIntegerv:
const ( WIDTH PropertyName = 0x20 HEIGHT PropertyName = 0x21 FORMAT PropertyName = 0x22 TYPE PropertyName = 0x23 MAX_WIDTH PropertyName = 0x24 /* new in 4.0 */ MAX_HEIGHT PropertyName = 0x25 /* new in 4.0 */ )
Source Files