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

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Vocabulary
gpu.textures

Inputs

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

Outputs
None

Word description
Reads the entire 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 component-order and component-type of 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-compressed-texture-to, read-texture, read-texture-image

Definition

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

IN: gpu.textures

TYPED:: read-texture-to
    ( tdt: texture-data-target level: integer gpu-data-ptr -- )
    tdt bind-tdt :> texture tdt texture-data-gl-target level
    texture [ component-order>> ] [ component-type>> ] bi
    image-data-format gpu-data-ptr pixel-pack-buffer
    [ glGetTexImage ] with-gpu-data-ptr ;