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GstGLMemoryPBO

GstGLMemoryPBO — memory subclass for GL textures

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstAllocator
                ╰── GstGLBaseMemoryAllocator
                    ╰── GstGLMemoryAllocator
                        ╰── GstGLMemoryPBOAllocator

Description

GstGLMemoryPBO is created or wrapped through gst_gl_base_memory_alloc() with GstGLVideoAllocationParams.

Data is uploaded or downloaded from the GPU as is necessary.

Functions

gst_is_gl_memory_pbo ()

gboolean
gst_is_gl_memory_pbo (GstMemory *mem);

Parameters

mem

a GstMemory

 

Returns

whether the memory at mem is a GstGLMemoryPBO

Since: 1.8


gst_gl_memory_pbo_copy_into_texture ()

gboolean
gst_gl_memory_pbo_copy_into_texture (GstGLMemoryPBO *gl_mem,
                                     guint tex_id,
                                     GstGLTextureTarget target,
                                     GstGLFormat tex_format,
                                     gint width,
                                     gint height,
                                     gint stride,
                                     gboolean respecify);

Copies gl_mem into the texture specfified by tex_id . The format of tex_id is specified by tex_format , width and height .

If respecify is TRUE, then the copy is performed in terms of the texture data. This is useful for splitting RGBA textures into RG or R textures or vice versa. The requirement for this to succeed is that the backing texture data must be the same size, i.e. say a RGBA8 texture is converted into a RG8 texture, then the RG texture must have twice as many pixels available for output as the RGBA texture.

Otherwise, if respecify is FALSE, then the copy is performed per texel using glCopyTexImage. See the OpenGL specification for details on the mappings between texture formats.

Parameters

gl_mem

a GstGLMemoryPBO

 

tex_id

the destination texture id

 

target

the destination GstGLTextureTarget

 

tex_format

the destination GstGLFormat

 

width

width of tex_id

 

height

height of tex_id

 

stride

stride of the backing texture data

 

respecify

whether to copy the data or copy per texel

 

Returns

Whether the copy suceeded

Since: 1.8


gst_gl_memory_pbo_download_transfer ()

void
gst_gl_memory_pbo_download_transfer (GstGLMemoryPBO *gl_mem);

Transfer the texture data from the texture into the PBO if necessary.

Parameters

gl_mem

a GstGLMemoryPBO

 

Since: 1.8


gst_gl_memory_pbo_init_once ()

void
gst_gl_memory_pbo_init_once (void);

gst_gl_memory_pbo_upload_transfer ()

void
gst_gl_memory_pbo_upload_transfer (GstGLMemoryPBO *gl_mem);

Transfer the texture data from the PBO into the texture if necessary.

Parameters

gl_mem

a GstGLMemoryPBO

 

Since: 1.8

Types and Values

GstGLMemoryPBOAllocator

typedef struct _GstGLMemoryPBOAllocator GstGLMemoryPBOAllocator;

GstGLMemoryPBOAllocatorClass

typedef struct {
  GstGLMemoryAllocatorClass parent_class;
} GstGLMemoryPBOAllocatorClass;

GST_GL_MEMORY_PBO_ALLOCATOR_NAME

#define GST_GL_MEMORY_PBO_ALLOCATOR_NAME   "GLMemoryPBO"

GstGLMemoryPBO

typedef struct {
} GstGLMemoryPBO;

Private instance

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