diff options
Diffstat (limited to 'src/gallium')
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 154 |
1 files changed, 93 insertions, 61 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index b6efd1d40cf..05688cc1f23 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -3,16 +3,19 @@ Screen A screen is an object representing the context-independent part of a device. -Useful Flags ------------- +Flags and enumerations +---------------------- + +XXX some of these don't belong in this section. + .. _pipe_cap: -PIPE_CAP -^^^^^^^^ +PIPE_CAP_* +^^^^^^^^^^ -Pipe capabilities help expose hardware functionality not explicitly required -by Gallium. For floating-point values, use :ref:`get_paramf`, and for boolean +Capability queries return information about the features and limits of the +driver/GPU. For floating-point values, use :ref:`get_paramf`, and for boolean or integer values, use :ref:`get_param`. The integer capabilities: @@ -56,6 +59,19 @@ The integer capabilities: to any shader stage using ``set_constant_buffer``. If 0 or 1, the pipe will only permit binding one constant buffer per shader, and the shaders will not permit two-dimensional access to constants. + +If a value greater than 0 is returned, the driver can have multiple +constant buffers bound to shader stages. The CONST register file can +be accessed with two-dimensional indices, like in the example below. + +DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0 +DCL CONST[3][0] # declare first vector of constbuf 3 +MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0 + +For backwards compatibility, one-dimensional access to CONST register +file is still supported. In that case, the constbuf index is assumed +to be 0. + * ``MAX_CONST_BUFFER_SIZE``: Maximum byte size of a single constant buffer. * ``INDEP_BLEND_ENABLE``: Whether per-rendertarget blend enabling and channel masks are supported. If 0, then the first rendertarget's blend mask is @@ -85,64 +101,54 @@ The floating-point capabilities: * ``GUARD_BAND_LEFT``, ``GUARD_BAND_TOP``, ``GUARD_BAND_RIGHT``, ``GUARD_BAND_BOTTOM``: XXX -XXX Is there a better home for this? vvv - -If 0 is returned, the driver is not aware of multiple constant buffers, -supports binding of only one constant buffer, and does not support -two-dimensional CONST register file access in TGSI shaders. - -If a value greater than 0 is returned, the driver can have multiple -constant buffers bound to shader stages. The CONST register file can -be accessed with two-dimensional indices, like in the example below. - -DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0 -DCL CONST[3][0] # declare first vector of constbuf 3 -MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0 -For backwards compatibility, one-dimensional access to CONST register -file is still supported. In that case, the constbuf index is assumed -to be 0. .. _pipe_bind: -PIPE_BIND -^^^^^^^^^ +PIPE_BIND_* +^^^^^^^^^^^ -These flags control resource creation. Resources may be used in different roles +These flags indicate how a resource will be used and are specified at resource +creation time. Resources may be used in different roles during their lifecycle. Bind flags are cumulative and may be combined to create -a resource which can be used as multiple things. -Depending on the pipe driver's memory management, depending on these bind flags +a resource which can be used for multiple things. +Depending on the pipe driver's memory management and these bind flags, resources might be created and handled quite differently. -* ``RENDER_TARGET``: A color buffer or pixel buffer which will be rendered to. -* ``DISPLAY_TARGET``: A sharable buffer that can be given to another process. -* ``DEPTH_STENCIL``: A depth (Z) buffer or stencil buffer. Gallium does - not explicitly provide for stencil-only buffers, so any stencil buffer - validated here is implicitly also a depth buffer. -* ``SAMPLER_VIEW``: A texture that may be sampled from in a fragment or vertex - shader. -* ``VERTEX_BUFFER``: A vertex buffer. -* ``INDEX_BUFFER``: An element buffer. -* ``CONSTANT_BUFFER``: A buffer of shader constants. -* ``BLIT_SOURCE``: A blit source, as given to surface_copy. -* ``BLIT_DESTINATION``: A blit destination, as given to surface_copy and surface_fill. -* ``TRANSFER_WRITE``: A transfer object which will be written to. -* ``TRANSFER_READ``: A transfer object which will be read from. -* ``CUSTOM``: -* ``SCANOUT``: A front color buffer or scanout buffer. -* ``SHARED``: +* ``PIPE_BIND_RENDER_TARGET``: A color buffer or pixel buffer which will be + rendered to. Any surface/resource attached to pipe_framebuffer_state::cbufs + must have this flag set. +* ``PIPE_BIND_DEPTH_STENCIL``: A depth (Z) buffer and/or stencil buffer. Any + depth/stencil surface/resource attached to pipe_framebuffer_state::zsbuf must + have this flag set. +* ``PIPE_BIND_DISPLAY_TARGET``: A sharable buffer that can be given to another + process. +* ``PIPE_BIND_SAMPLER_VIEW``: A texture that may be sampled from in a fragment + or vertex shader. +* ``PIPE_BIND_VERTEX_BUFFER``: A vertex buffer. +* ``PIPE_BIND_INDEX_BUFFER``: An vertex index/element buffer. +* ``PIPE_BIND_CONSTANT_BUFFER``: A buffer of shader constants. +* ``PIPE_BIND_BLIT_SOURCE``: A blit source, as given to surface_copy. +* ``PIPE_BIND_BLIT_DESTINATION``: A blit destination, as given to surface_copy + and surface_fill. +* ``PIPE_BIND_TRANSFER_WRITE``: A transfer object which will be written to. +* ``PIPE_BIND_TRANSFER_READ``: A transfer object which will be read from. +* ``PIPE_BIND_CUSTOM``: +* ``PIPE_BIND_SCANOUT``: A front color buffer or scanout buffer. +* ``PIPE_BIND_SHARED``: .. _pipe_usage: -PIPE_USAGE -^^^^^^^^^^ +PIPE_USAGE_* +^^^^^^^^^^^^ + +The PIPE_USAGE enums are hints about the expected usage pattern of a resource. -The PIPE_USAGE enums are hints about the expected lifecycle of a resource. -* ``DEFAULT``: Expect many uploads to the resource, intermixed with draws. -* ``DYNAMIC``: Expect many uploads to the resource, intermixed with draws. -* ``STATIC``: Same as immutable (?) -* ``IMMUTABLE``: Resource will not be changed after first upload. -* ``STREAM``: Upload will be followed by draw, followed by upload, ... +* ``PIPE_USAGE_DEFAULT``: Expect many uploads to the resource, intermixed with draws. +* ``PIPE_USAGE_DYNAMIC``: Expect many uploads to the resource, intermixed with draws. +* ``PIPE_USAGE_STATIC``: Same as immutable (?) +* ``PIPE_USAGE_IMMUTABLE``: Resource will not be changed after first upload. +* ``PIPE_USAGE_STREAM``: Upload will be followed by draw, followed by upload, ... @@ -162,7 +168,7 @@ For example, a compressed format might only be used for POT textures. Methods ------- -XXX moar; got bored +XXX to-do get_name ^^^^^^^^ @@ -204,9 +210,15 @@ and/or front-buffer rendering. is_format_supported ^^^^^^^^^^^^^^^^^^^ -See if a format can be used in a specific manner. +Determine if a resource in the given format can be used in a specific manner. -**tex_usage** is a bitmask of :ref:`PIPE_BIND` flags. +**format** the resource format + +**target** one of the PIPE_TEXTURE_x flags + +**bindings** is a bitmask of :ref:`PIPE_BIND` flags. + +**geom_flags** is a bitmask of PIPE_TEXTURE_GEOM_x flags. Returns TRUE if all usages can be satisfied. @@ -214,15 +226,35 @@ Returns TRUE if all usages can be satisfied. .. _resource_create: resource_create -^^^^^^^^^^^^^^ +^^^^^^^^^^^^^^^ + +Create a new resource from a template. +The following fields of the pipe_resource must be specified in the template: + +target + +format + +width0 + +height0 + +depth0 + +last_level + +nr_samples + +usage + +bind + +flags + -Given a template of texture setup, create a resource. -The way a resource may be used is specifed by bind flags, :ref:`pipe_bind`. -and hints are used to indicate to the driver what access pattern might be -likely, :ref:`pipe_usage`. resource_destroy -^^^^^^^^^^^^^^^ +^^^^^^^^^^^^^^^^ Destroy a resource. A resource is destroyed if it has no more references. |