gallium/docs: update the documentation of capabilities
Still like 13 caps are undocumented.
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Marek Olšák
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bf0baa7717
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74d6f929b4
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@ -22,75 +22,49 @@ or integer values, use :ref:`get_param`.
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The integer capabilities:
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* ``MAX_TEXTURE_IMAGE_UNITS``: The maximum number of samplers available.
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* ``NPOT_TEXTURES``: Whether :term:`NPOT` textures may have repeat modes,
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* ``PIPE_CAP_NPOT_TEXTURES``: Whether :term:`NPOT` textures may have repeat modes,
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normalized coordinates, and mipmaps.
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* ``TWO_SIDED_STENCIL``: Whether the stencil test can also affect back-facing
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* ``PIPE_CAP_TWO_SIDED_STENCIL``: Whether the stencil test can also affect back-facing
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polygons.
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* ``GLSL``: Deprecated.
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* ``DUAL_SOURCE_BLEND``: Whether dual-source blend factors are supported. See
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* ``PIPE_CAP_GLSL``: Deprecated.
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* ``PIPE_CAP_DUAL_SOURCE_BLEND``: Whether dual-source blend factors are supported. See
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:ref:`Blend` for more information.
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* ``ANISOTROPIC_FILTER``: Whether textures can be filtered anisotropically.
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* ``POINT_SPRITE``: Whether point sprites are available.
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* ``MAX_RENDER_TARGETS``: The maximum number of render targets that may be
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* ``PIPE_CAP_ANISOTROPIC_FILTER``: Whether textures can be filtered anisotropically.
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* ``PIPE_CAP_POINT_SPRITE``: Whether point sprites are available.
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* ``PIPE_CAP_MAX_RENDER_TARGETS``: The maximum number of render targets that may be
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bound.
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* ``OCCLUSION_QUERY``: Whether occlusion queries are available.
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* ``TIMER_QUERY``: Whether timer queries are available.
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* ``INSTANCED_DRAWING``: indicates support for instanced drawing.
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* ``TEXTURE_SHADOW_MAP``: indicates whether the fragment shader hardware
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* ``PIPE_CAP_OCCLUSION_QUERY``: Whether occlusion queries are available.
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* ``PIPE_CAP_TIMER_QUERY``: Whether timer queries are available.
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* ``PIPE_CAP_TEXTURE_SHADOW_MAP``: indicates whether the fragment shader hardware
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can do the depth texture / Z comparison operation in TEX instructions
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for shadow testing.
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* ``MAX_TEXTURE_2D_LEVELS``: The maximum number of mipmap levels available
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* ``PIPE_CAP_TEXTURE_SWIZZLE``: Whether swizzling through sampler views is
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supported.
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* ``PIPE_CAP_MAX_TEXTURE_2D_LEVELS``: The maximum number of mipmap levels available
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for a 2D texture.
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* ``MAX_TEXTURE_3D_LEVELS``: The maximum number of mipmap levels available
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* ``PIPE_CAP_MAX_TEXTURE_3D_LEVELS``: The maximum number of mipmap levels available
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for a 3D texture.
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* ``MAX_TEXTURE_CUBE_LEVELS``: The maximum number of mipmap levels available
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* ``PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS``: The maximum number of mipmap levels available
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for a cubemap.
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* ``TEXTURE_MIRROR_CLAMP``: Whether mirrored texture coordinates with clamp
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* ``PIPE_CAP_TEXTURE_MIRROR_CLAMP``: Whether mirrored texture coordinates with clamp
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are supported.
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* ``TEXTURE_MIRROR_REPEAT``: Whether mirrored repeating texture coordinates
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are supported.
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* ``MAX_VERTEX_TEXTURE_UNITS``: The maximum number of samplers addressable
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inside the vertex shader. If this is 0, then the vertex shader cannot
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sample textures.
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* ``TGSI_CONT_SUPPORTED``: Whether the TGSI CONT opcode is supported.
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* ``BLEND_EQUATION_SEPARATE``: Whether alpha blend equations may be different
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* ``PIPE_CAP_BLEND_EQUATION_SEPARATE``: Whether alpha blend equations may be different
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from color blend equations, in :ref:`Blend` state.
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* ``SM3``: Whether the vertex shader and fragment shader support equivalent
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* ``PIPE_CAP_SM3``: Whether the vertex shader and fragment shader support equivalent
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opcodes to the Shader Model 3 specification. XXX oh god this is horrible
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* ``MAX_PREDICATE_REGISTERS``: indicates the number of predicate registers
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available. Predicate register may be set as a side-effect of ALU
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instructions to indicate less than, greater than or equal to zero.
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Later instructions can use a predicate register to control writing to
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each channel of destination registers. NOTE: predicate registers have
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not been fully implemented in Gallium at this time. See the
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GL_NV_fragment_program extension for more info (look for "condition codes").
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* ``MAX_COMBINED_SAMPLERS``: The total number of samplers accessible from
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* ``PIPE_CAP_MAX_COMBINED_SAMPLERS``: The total number of samplers accessible from
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the vertex and fragment shader, inclusive.
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* ``MAX_CONST_BUFFERS``: Maximum number of constant buffers that can be bound
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to any shader stage using ``set_constant_buffer``. If 0 or 1, the pipe will
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only permit binding one constant buffer per shader, and the shaders will
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not permit two-dimensional access to constants.
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If a value greater than 0 is returned, the driver can have multiple
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constant buffers bound to shader stages. The CONST register file can
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be accessed with two-dimensional indices, like in the example below.
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DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0
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DCL CONST[3][0] # declare first vector of constbuf 3
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MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0
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For backwards compatibility, one-dimensional access to CONST register
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file is still supported. In that case, the constbuf index is assumed
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to be 0.
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* ``MAX_CONST_BUFFER_SIZE``: Maximum byte size of a single constant buffer.
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* ``INDEP_BLEND_ENABLE``: Whether per-rendertarget blend enabling and channel
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* ``PIPE_CAP_INDEP_BLEND_ENABLE``: Whether per-rendertarget blend enabling and channel
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masks are supported. If 0, then the first rendertarget's blend mask is
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replicated across all MRTs.
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* ``INDEP_BLEND_FUNC``: Whether per-rendertarget blend functions are
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* ``PIPE_CAP_INDEP_BLEND_FUNC``: Whether per-rendertarget blend functions are
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available. If 0, then the first rendertarget's blend functions affect all
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MRTs.
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* ``PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE``: Whether clearing only depth or only
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stencil in a combined depth-stencil buffer is supported.
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* ``PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS``: The maximum number of texture array
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layers supported. If 0, the array textures are not supported at all and
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the ARRAY texture targets are invalid.
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* ``PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT``: Whether the TGSI property
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FS_COORD_ORIGIN with value UPPER_LEFT is supported.
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* ``PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT``: Whether the TGSI property
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@ -102,33 +76,70 @@ to be 0.
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The floating-point capabilities:
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* ``MAX_LINE_WIDTH``: The maximum width of a regular line.
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* ``MAX_LINE_WIDTH_AA``: The maximum width of a smoothed line.
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* ``MAX_POINT_WIDTH``: The maximum width and height of a point.
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* ``MAX_POINT_WIDTH_AA``: The maximum width and height of a smoothed point.
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* ``MAX_TEXTURE_ANISOTROPY``: The maximum level of anisotropy that can be
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* ``PIPE_CAP_MAX_LINE_WIDTH``: The maximum width of a regular line.
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* ``PIPE_CAP_MAX_LINE_WIDTH_AA``: The maximum width of a smoothed line.
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* ``PIPE_CAP_MAX_POINT_WIDTH``: The maximum width and height of a point.
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* ``PIPE_CAP_MAX_POINT_WIDTH_AA``: The maximum width and height of a smoothed point.
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* ``PIPE_CAP_MAX_TEXTURE_ANISOTROPY``: The maximum level of anisotropy that can be
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applied to anisotropically filtered textures.
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* ``MAX_TEXTURE_LOD_BIAS``: The maximum :term:`LOD` bias that may be applied
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* ``PIPE_CAP_MAX_TEXTURE_LOD_BIAS``: The maximum :term:`LOD` bias that may be applied
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to filtered textures.
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* ``GUARD_BAND_LEFT``, ``GUARD_BAND_TOP``, ``GUARD_BAND_RIGHT``,
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``GUARD_BAND_BOTTOM``: XXX
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* ``PIPE_CAP_GUARD_BAND_LEFT``,
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``PIPE_CAP_GUARD_BAND_TOP``,
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``PIPE_CAP_GUARD_BAND_RIGHT``,
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``PIPE_CAP_GUARD_BAND_BOTTOM``: TODO
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Fragment shader limits:
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* ``PIPE_CAP_MAX_FS_INSTRUCTIONS``: The maximum number of instructions.
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* ``PIPE_CAP_MAX_FS_ALU_INSTRUCTIONS``: The maximum number of arithmetic instructions.
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* ``PIPE_CAP_MAX_FS_TEX_INSTRUCTIONS``: The maximum number of texture instructions.
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* ``PIPE_CAP_MAX_FS_TEX_INDIRECTIONS``: The maximum number of texture indirections.
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* ``PIPE_CAP_MAX_FS_CONTROL_FLOW_DEPTH``: The maximum nested control flow depth.
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* ``PIPE_CAP_MAX_FS_INPUTS``: The maximum number of input registers.
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* ``PIPE_CAP_MAX_FS_CONSTS``: The maximum number of constants.
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* ``PIPE_CAP_MAX_FS_TEMPS``: The maximum number of temporary registers.
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* ``PIPE_CAP_MAX_FS_ADDRS``: The maximum number of address registers.
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* ``PIPE_CAP_MAX_FS_PREDS``: The maximum number of predicate registers.
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.. _pipe_shader_cap:
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Vertex shader limits:
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PIPE_SHADER_CAP_*
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^^^^^^^^^^^^^^^^^
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* ``PIPE_CAP_MAX_VS_*``: Identical to ``PIPE_CAP_MAX_FS_*``.
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These are per-shader-stage capabitity queries. Different shader stages may
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support different features.
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* ``PIPE_SHADER_CAP_MAX_INSTRUCTIONS``: The maximum number of instructions.
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* ``PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS``: The maximum number of arithmetic instructions.
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* ``PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS``: The maximum number of texture instructions.
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* ``PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS``: The maximum number of texture indirections.
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* ``PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH``: The maximum nested control flow depth.
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* ``PIPE_SHADER_CAP_MAX_INPUTS``: The maximum number of input registers.
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* ``PIPE_SHADER_CAP_MAX_CONSTS``: The maximum number of constants.
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* ``PIPE_SHADER_CAP_MAX_CONST_BUFFERS``: Maximum number of constant buffers that can be bound
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to any shader stage using ``set_constant_buffer``. If 0 or 1, the pipe will
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only permit binding one constant buffer per shader, and the shaders will
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not permit two-dimensional access to constants.
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If a value greater than 0 is returned, the driver can have multiple
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constant buffers bound to shader stages. The CONST register file can
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be accessed with two-dimensional indices, like in the example below.
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DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0
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DCL CONST[3][0] # declare first vector of constbuf 3
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MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0
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For backwards compatibility, one-dimensional access to CONST register
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file is still supported. In that case, the constbuf index is assumed
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to be 0.
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* ``PIPE_SHADER_CAP_MAX_TEMPS``: The maximum number of temporary registers.
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* ``PIPE_SHADER_CAP_MAX_ADDRS``: The maximum number of address registers.
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* ``PIPE_SHADER_CAP_MAX_PREDS``: The maximum number of predicate registers.
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* ``PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED``: Whether the continue opcode is supported.
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* ``PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR``: Whether indirect addressing
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of the input file is supported.
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* ``PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR``: Whether indirect addressing
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of the output file is supported.
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* ``PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR``: Whether indirect addressing
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of the temporary file is supported.
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* ``PIPE_SHADER_CAP_INDIRECT_CONST_ADDR``: Whether indirect addressing
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of the constant file is supported.
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* ``PIPE_SHADER_CAP_SUBROUTINES``: Whether subroutines are supported, i.e.
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BGNSUB, ENDSUB, CAL, and RET, including RET in the main block.
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* ``PIPE_SHADER_CAP_INTEGERS``: Whether integer opcodes are supported.
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If unsupported, only float opcodes are supported.
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* ``PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS``: THe maximum number of texture
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samplers.
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.. _pipe_bind:
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