read-compressed-texture-to ( tdt: texture-data-target level: integer gpu-data-ptr -- )
GPU-accelerated rendering » Texture objects

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read-compressed-texture ( tdt: texture-data-target level: integer -- byte-array: byte-array )

Vocabulary
gpu.textures

Inputs

tdt	a texture-data-target
level	an integer
gpu-data-ptr	a byte-array

Outputs
None

Word description
Reads the entire compressed image for the levelth level of detail of a texture into the CPU or GPU memory referenced by gpu-data-ptr. The format of the written data is determined by the compressed-texture-format of the data originally allocated by allocate-compressed-texture for the texture.

Notes
Reading texture data into a GPU buffer-ptr requires OpenGL 2.1 or later or the GL_ARB_pixel_buffer_object extension.

See also
read-compressed-texture, read-texture, read-texture-image, read-texture-to

Definition

USING: gpu.buffers gpu.textures.private opengl.gl typed ;

IN: gpu.textures

TYPED:: read-compressed-texture-to
    ( tdt: texture-data-target level: integer gpu-data-ptr -- )
    tdt bind-tdt :> texture tdt texture-data-gl-target level
    gpu-data-ptr pixel-pack-buffer
    [ glGetCompressedTexImage ] with-gpu-data-ptr ;