6
A screen is an object representing the context-independent part of a device.
11
XXX some of these don't belong in this section.
19
Capability queries return information about the features and limits of the
20
driver/GPU. For floating-point values, use :ref:`get_paramf`, and for boolean
21
or integer values, use :ref:`get_param`.
23
The integer capabilities:
25
* ``PIPE_CAP_NPOT_TEXTURES``: Whether :term:`NPOT` textures may have repeat modes,
26
normalized coordinates, and mipmaps.
27
* ``PIPE_CAP_TWO_SIDED_STENCIL``: Whether the stencil test can also affect back-facing
29
* ``PIPE_CAP_DUAL_SOURCE_BLEND``: Whether dual-source blend factors are supported. See
30
:ref:`Blend` for more information.
31
* ``PIPE_CAP_ANISOTROPIC_FILTER``: Whether textures can be filtered anisotropically.
32
* ``PIPE_CAP_POINT_SPRITE``: Whether point sprites are available.
33
* ``PIPE_CAP_MAX_RENDER_TARGETS``: The maximum number of render targets that may be
35
* ``PIPE_CAP_OCCLUSION_QUERY``: Whether occlusion queries are available.
36
* ``PIPE_CAP_TIMER_QUERY``: Whether timer queries are available.
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* ``PIPE_CAP_TEXTURE_SHADOW_MAP``: indicates whether the fragment shader hardware
38
can do the depth texture / Z comparison operation in TEX instructions
40
* ``PIPE_CAP_TEXTURE_SWIZZLE``: Whether swizzling through sampler views is
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* ``PIPE_CAP_MAX_TEXTURE_2D_LEVELS``: The maximum number of mipmap levels available
44
* ``PIPE_CAP_MAX_TEXTURE_3D_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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* ``PIPE_CAP_TEXTURE_MIRROR_CLAMP``: Whether mirrored texture coordinates with clamp
50
* ``PIPE_CAP_BLEND_EQUATION_SEPARATE``: Whether alpha blend equations may be different
51
from color blend equations, in :ref:`Blend` state.
52
* ``PIPE_CAP_SM3``: Whether the vertex shader and fragment shader support equivalent
53
opcodes to the Shader Model 3 specification. XXX oh god this is horrible
54
* ``PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS``: The maximum number of stream buffers.
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* ``PIPE_CAP_PRIMITIVE_RESTART``: Whether primitive restart is supported.
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* ``PIPE_CAP_MAX_COMBINED_SAMPLERS``: The total number of samplers accessible from
57
the vertex and fragment shader, inclusive.
58
* ``PIPE_CAP_INDEP_BLEND_ENABLE``: Whether per-rendertarget blend enabling and channel
59
masks are supported. If 0, then the first rendertarget's blend mask is
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replicated across all MRTs.
61
* ``PIPE_CAP_INDEP_BLEND_FUNC``: Whether per-rendertarget blend functions are
62
available. If 0, then the first rendertarget's blend functions affect all
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* ``PIPE_CAP_DEPTHSTENCIL_CLEAR_SEPARATE``: Whether clearing only depth or only
65
stencil in a combined depth-stencil buffer is supported.
66
* ``PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS``: The maximum number of texture array
67
layers supported. If 0, the array textures are not supported at all and
68
the ARRAY texture targets are invalid.
69
* ``PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT``: Whether the TGSI property
70
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
72
FS_COORD_ORIGIN with value LOWER_LEFT is supported.
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* ``PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER``: Whether the TGSI
74
property FS_COORD_PIXEL_CENTER with value HALF_INTEGER is supported.
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* ``PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER``: Whether the TGSI
76
property FS_COORD_PIXEL_CENTER with value INTEGER is supported.
84
The floating-point capabilities are:
86
* ``PIPE_CAPF_MAX_LINE_WIDTH``: The maximum width of a regular line.
87
* ``PIPE_CAPF_MAX_LINE_WIDTH_AA``: The maximum width of a smoothed line.
88
* ``PIPE_CAPF_MAX_POINT_WIDTH``: The maximum width and height of a point.
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* ``PIPE_CAPF_MAX_POINT_WIDTH_AA``: The maximum width and height of a smoothed point.
90
* ``PIPE_CAPF_MAX_TEXTURE_ANISOTROPY``: The maximum level of anisotropy that can be
91
applied to anisotropically filtered textures.
92
* ``PIPE_CAPF_MAX_TEXTURE_LOD_BIAS``: The maximum :term:`LOD` bias that may be applied
94
* ``PIPE_CAPF_GUARD_BAND_LEFT``,
95
``PIPE_CAPF_GUARD_BAND_TOP``,
96
``PIPE_CAPF_GUARD_BAND_RIGHT``,
97
``PIPE_CAPF_GUARD_BAND_BOTTOM``: TODO
105
These are per-shader-stage capabitity queries. Different shader stages may
106
support different features.
108
* ``PIPE_SHADER_CAP_MAX_INSTRUCTIONS``: The maximum number of instructions.
109
* ``PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS``: The maximum number of arithmetic instructions.
110
* ``PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS``: The maximum number of texture instructions.
111
* ``PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS``: The maximum number of texture indirections.
112
* ``PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH``: The maximum nested control flow depth.
113
* ``PIPE_SHADER_CAP_MAX_INPUTS``: The maximum number of input registers.
114
* ``PIPE_SHADER_CAP_MAX_CONSTS``: The maximum number of constants.
115
* ``PIPE_SHADER_CAP_MAX_CONST_BUFFERS``: Maximum number of constant buffers that can be bound
116
to any shader stage using ``set_constant_buffer``. If 0 or 1, the pipe will
117
only permit binding one constant buffer per shader, and the shaders will
118
not permit two-dimensional access to constants.
120
If a value greater than 0 is returned, the driver can have multiple
121
constant buffers bound to shader stages. The CONST register file can
122
be accessed with two-dimensional indices, like in the example below.
124
DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0
125
DCL CONST[3][0] # declare first vector of constbuf 3
126
MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0
128
For backwards compatibility, one-dimensional access to CONST register
129
file is still supported. In that case, the constbuf index is assumed
132
* ``PIPE_SHADER_CAP_MAX_TEMPS``: The maximum number of temporary registers.
133
* ``PIPE_SHADER_CAP_MAX_ADDRS``: The maximum number of address registers.
134
* ``PIPE_SHADER_CAP_MAX_PREDS``: The maximum number of predicate registers.
135
* ``PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED``: Whether the continue opcode is supported.
136
* ``PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR``: Whether indirect addressing
137
of the input file is supported.
138
* ``PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR``: Whether indirect addressing
139
of the output file is supported.
140
* ``PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR``: Whether indirect addressing
141
of the temporary file is supported.
142
* ``PIPE_SHADER_CAP_INDIRECT_CONST_ADDR``: Whether indirect addressing
143
of the constant file is supported.
144
* ``PIPE_SHADER_CAP_SUBROUTINES``: Whether subroutines are supported, i.e.
145
BGNSUB, ENDSUB, CAL, and RET, including RET in the main block.
146
* ``PIPE_SHADER_CAP_INTEGERS``: Whether integer opcodes are supported.
147
If unsupported, only float opcodes are supported.
148
* ``PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS``: THe maximum number of texture
157
These flags indicate how a resource will be used and are specified at resource
158
creation time. Resources may be used in different roles
159
during their lifecycle. Bind flags are cumulative and may be combined to create
160
a resource which can be used for multiple things.
161
Depending on the pipe driver's memory management and these bind flags,
162
resources might be created and handled quite differently.
164
* ``PIPE_BIND_RENDER_TARGET``: A color buffer or pixel buffer which will be
165
rendered to. Any surface/resource attached to pipe_framebuffer_state::cbufs
166
must have this flag set.
167
* ``PIPE_BIND_DEPTH_STENCIL``: A depth (Z) buffer and/or stencil buffer. Any
168
depth/stencil surface/resource attached to pipe_framebuffer_state::zsbuf must
170
* ``PIPE_BIND_BLENDABLE``: Used in conjunction with PIPE_BIND_RENDER_TARGET to
171
query whether a device supports blending for a given format.
172
If this flag is set, surface creation may fail if blending is not supported
173
for the specified format. If it is not set, a driver may choose to ignore
174
blending on surfaces with formats that would require emulation.
175
* ``PIPE_BIND_DISPLAY_TARGET``: A surface that can be presented to screen. Arguments to
176
pipe_screen::flush_front_buffer must have this flag set.
177
* ``PIPE_BIND_SAMPLER_VIEW``: A texture that may be sampled from in a fragment
179
* ``PIPE_BIND_VERTEX_BUFFER``: A vertex buffer.
180
* ``PIPE_BIND_INDEX_BUFFER``: An vertex index/element buffer.
181
* ``PIPE_BIND_CONSTANT_BUFFER``: A buffer of shader constants.
182
* ``PIPE_BIND_TRANSFER_WRITE``: A transfer object which will be written to.
183
* ``PIPE_BIND_TRANSFER_READ``: A transfer object which will be read from.
184
* ``PIPE_BIND_STREAM_OUTPUT``: A stream output buffer.
185
* ``PIPE_BIND_CUSTOM``:
186
* ``PIPE_BIND_SCANOUT``: A front color buffer or scanout buffer.
187
* ``PIPE_BIND_SHARED``: A sharable buffer that can be given to another
195
The PIPE_USAGE enums are hints about the expected usage pattern of a resource.
197
* ``PIPE_USAGE_DEFAULT``: Expect many uploads to the resource, intermixed with draws.
198
* ``PIPE_USAGE_DYNAMIC``: Expect many uploads to the resource, intermixed with draws.
199
* ``PIPE_USAGE_STATIC``: Same as immutable (?)
200
* ``PIPE_USAGE_IMMUTABLE``: Resource will not be changed after first upload.
201
* ``PIPE_USAGE_STREAM``: Upload will be followed by draw, followed by upload, ...
212
Returns an identifying name for the screen.
217
Returns the screen vendor.
224
Get an integer/boolean screen parameter.
226
**param** is one of the :ref:`PIPE_CAP` names.
233
Get a floating-point screen parameter.
235
**param** is one of the :ref:`PIPE_CAP` names.
240
Create a pipe_context.
242
**priv** is private data of the caller, which may be put to various
243
unspecified uses, typically to do with implementing swapbuffers
244
and/or front-buffer rendering.
249
Determine if a resource in the given format can be used in a specific manner.
251
**format** the resource format
253
**target** one of the PIPE_TEXTURE_x flags
255
**sample_count** the number of samples. 0 and 1 mean no multisampling,
256
the maximum allowed legal value is 32.
258
**bindings** is a bitmask of :ref:`PIPE_BIND` flags.
260
**geom_flags** is a bitmask of PIPE_TEXTURE_GEOM_x flags.
262
Returns TRUE if all usages can be satisfied.
269
Create a new resource from a template.
270
The following fields of the pipe_resource must be specified in the template:
272
**target** one of the pipe_texture_target enums.
273
Note that PIPE_BUFFER and PIPE_TEXTURE_X are not really fundamentally different.
274
Modern APIs allow using buffers as shader resources.
276
**format** one of the pipe_format enums.
278
**width0** the width of the base mip level of the texture or size of the buffer.
280
**height0** the height of the base mip level of the texture
281
(1 for 1D or 1D array textures).
283
**depth0** the depth of the base mip level of the texture
284
(1 for everything else).
286
**array_size** the array size for 1D and 2D array textures.
287
For cube maps this must be 6, for other textures 1.
289
**last_level** the last mip map level present.
291
**nr_samples** the nr of msaa samples. 0 (or 1) specifies a resource
292
which isn't multisampled.
294
**usage** one of the PIPE_USAGE flags.
296
**bind** bitmask of the PIPE_BIND flags.
298
**flags** bitmask of PIPE_RESOURCE_FLAG flags.
305
Destroy a resource. A resource is destroyed if it has no more references.