gallium: add PIPE_TEXTURE_RECT target
This allows to properly support OpenGL rectangle textures in a well defined way, especially on drivers that don't expose PIPE_CAP_NPOT_TEXTURES.
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@ -15,6 +15,7 @@ Contents:
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debugging
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tgsi
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screen
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resources
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context
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cso
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distro
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@ -0,0 +1,41 @@
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Resources
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=========
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Resources represent objects that hold data: textures and buffers.
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They are mostly modelled after the resources in Direct3D 10/11, but with a
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different transfer/update mechanism, and more features for OpenGL support.
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Resource targets
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----------------
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Resource targets determine the type of a resource.
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Note that drivers may not actually have the restrictions listed regarding
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coordinate normalization and wrap modes, and in fact efficient OpenCL
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support will probably require drivers that don't have any of them, which
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will probably be advertised with an appropriate cap.
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TODO: document all targets. Note that both 3D and cube have restrictions
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that depend on the hardware generation.
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TODO: can buffers have a non-R8 format?
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PIPE_TEXTURE_RECT
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^^^^^^^^^^^^^^^^^
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2D surface with OpenGL GL_TEXTURE_RECTANGLE semantics.
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depth must be 1
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- last_level must be 0
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- Must use unnormalized coordinates
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- Must use a clamp wrap mode
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PIPE_TEXTURE_2D
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^^^^^^^^^^^^^^^
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2D surface accessed with normalized coordinates.
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- If PIPE_CAP_NPOT_TEXTURES is not supported,
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width and height must be powers of two
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- Mipmaps can be used
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- Must use normalized coordinates
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- No special restrictions on wrap modes
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@ -135,13 +135,15 @@ enum pipe_error {
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#define PIPE_STENCIL_OP_DECR_WRAP 6
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#define PIPE_STENCIL_OP_INVERT 7
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/** Texture types */
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/** Texture types.
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* See the documentation for info on PIPE_TEXTURE_RECT vs PIPE_TEXTURE_2D */
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enum pipe_texture_target {
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PIPE_BUFFER = 0,
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PIPE_TEXTURE_1D = 1,
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PIPE_TEXTURE_2D = 2,
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PIPE_TEXTURE_3D = 3,
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PIPE_TEXTURE_CUBE = 4,
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PIPE_TEXTURE_RECT = 5,
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PIPE_MAX_TEXTURE_TYPES
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};
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