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Diffstat (limited to 'src/gallium/docs/source/cso')
| -rw-r--r-- | src/gallium/docs/source/cso/blend.rst | 14 | ||||
| -rw-r--r-- | src/gallium/docs/source/cso/dsa.rst | 58 | ||||
| -rw-r--r-- | src/gallium/docs/source/cso/rasterizer.rst | 152 | ||||
| -rw-r--r-- | src/gallium/docs/source/cso/sampler.rst | 46 | ||||
| -rw-r--r-- | src/gallium/docs/source/cso/shader.rst | 12 |
5 files changed, 282 insertions, 0 deletions
diff --git a/src/gallium/docs/source/cso/blend.rst b/src/gallium/docs/source/cso/blend.rst new file mode 100644 index 0000000000..fd9e4a1e2d --- /dev/null +++ b/src/gallium/docs/source/cso/blend.rst @@ -0,0 +1,14 @@ +.. _blend: + +Blend +===== + +This state controls blending of the final fragments into the target rendering +buffers. + +XXX it is unresolved what behavior should result if blend_enable is off. + +Members +------- + +XXX undocumented members diff --git a/src/gallium/docs/source/cso/dsa.rst b/src/gallium/docs/source/cso/dsa.rst new file mode 100644 index 0000000000..12abaa9d6f --- /dev/null +++ b/src/gallium/docs/source/cso/dsa.rst @@ -0,0 +1,58 @@ +.. _depth,stencil,&alpha: + +Depth, Stencil, & Alpha +======================= + +These three states control the depth, stencil, and alpha tests, used to +discard fragments that have passed through the fragment shader. + +Traditionally, these three tests have been clumped together in hardware, so +they are all stored in one structure. + +During actual execution, the order of operations done on fragments is always: + +* Stencil +* Depth +* Alpha + +Depth Members +------------- + +enabled + Whether the depth test is enabled. +writemask + Whether the depth buffer receives depth writes. +func + The depth test function. One of PIPE_FUNC. + +Stencil Members +--------------- + +XXX document valuemask, writemask + +enabled + Whether the stencil test is enabled. For the second stencil, whether the + two-sided stencil is enabled. +func + The stencil test function. One of PIPE_FUNC. +ref_value + Stencil test reference value; used for certain functions. +fail_op + The operation to carry out if the stencil test fails. One of + PIPE_STENCIL_OP. +zfail_op + The operation to carry out if the stencil test passes but the depth test + fails. One of PIPE_STENCIL_OP. +zpass_op + The operation to carry out if the stencil test and depth test both pass. + One of PIPE_STENCIL_OP. + +Alpha Members +------------- + +enabled + Whether the alpha test is enabled. +func + The alpha test function. One of PIPE_FUNC. +ref_value + Alpha test reference value; used for certain functions. diff --git a/src/gallium/docs/source/cso/rasterizer.rst b/src/gallium/docs/source/cso/rasterizer.rst new file mode 100644 index 0000000000..4d8e1708e7 --- /dev/null +++ b/src/gallium/docs/source/cso/rasterizer.rst @@ -0,0 +1,152 @@ +.. _rasterizer: + +Rasterizer +========== + +The rasterizer state controls the rendering of points, lines and triangles. +Attributes include polygon culling state, line width, line stipple, +multisample state, scissoring and flat/smooth shading. + + +Members +------- + +flatshade + If set, the provoking vertex of each polygon is used to determine the + color of the entire polygon. If not set, fragment colors will be + interpolated between the vertex colors. + Note that this is separate from the fragment shader input attributes + CONSTANT, LINEAR and PERSPECTIVE. We need the flatshade state at + clipping time to determine how to set the color of new vertices. + Also note that the draw module can implement flat shading by copying + the provoking vertex color to all the other vertices in the primitive. + +flatshade_first + Whether the first vertex should be the provoking vertex, for most + primitives. If not set, the last vertex is the provoking vertex. + +light_twoside + If set, there are per-vertex back-facing colors. The draw module + uses this state along with the front/back information to set the + final vertex colors prior to rasterization. + +front_winding + Indicates the window order of front-facing polygons, either + PIPE_WINDING_CW or PIPE_WINDING_CCW +cull_mode + Indicates which polygons to cull, either PIPE_WINDING_NONE (cull no + polygons), PIPE_WINDING_CW (cull clockwise-winding polygons), + PIPE_WINDING_CCW (cull counter clockwise-winding polygons), or + PIPE_WINDING_BOTH (cull all polygons). + +fill_cw + Indicates how to fill clockwise polygons, either PIPE_POLYGON_MODE_FILL, + PIPE_POLYGON_MODE_LINE or PIPE_POLYGON_MODE_POINT. +fill_ccw + Indicates how to fill counter clockwise polygons, either + PIPE_POLYGON_MODE_FILL, PIPE_POLYGON_MODE_LINE or PIPE_POLYGON_MODE_POINT. + +poly_stipple_enable + Whether polygon stippling is enabled. +poly_smooth + Controls OpenGL-style polygon smoothing/antialiasing +offset_cw + If set, clockwise polygons will have polygon offset factors applied +offset_ccw + If set, counter clockwise polygons will have polygon offset factors applied +offset_units + Specifies the polygon offset bias +offset_scale + Specifies the polygon offset scale + +line_width + The width of lines. +line_smooth + Whether lines should be smoothed. Line smoothing is simply anti-aliasing. +line_stipple_enable + Whether line stippling is enabled. +line_stipple_pattern + 16-bit bitfield of on/off flags, used to pattern the line stipple. +line_stipple_factor + When drawinga stippled line, each bit in the stipple pattern is + repeated N times, where N = line_stipple_factor + 1. +line_last_pixel + Controls whether the last pixel in a line is drawn or not. OpenGL + omits the last pixel to avoid double-drawing pixels at the ends of lines + when drawing connected lines. + +point_smooth + Whether points should be smoothed. Point smoothing turns rectangular + points into circles or ovals. +point_size_per_vertex + Whether vertices have a point size element. +point_size + The size of points, if not specified per-vertex. +point_size_min + The minimum size of points. +point_size_max + The maximum size of points. +point_sprite + Whether points are drawn as sprites (textured quads) +sprite_coord_mode + Specifies how the value for each shader output should be computed when + drawing sprites. If PIPE_SPRITE_COORD_NONE, don't change the vertex + shader output. Otherwise, the four vertices of the resulting quad will + be assigned texture coordinates. For PIPE_SPRITE_COORD_LOWER_LEFT, the + lower left vertex will have coordinate (0,0,0,1). + For PIPE_SPRITE_COORD_UPPER_LEFT, the upper-left vertex will have + coordinate (0,0,0,1). + This state is needed by the 'draw' module because that's where each + point vertex is converted into four quad vertices. There's no other + place to emit the new vertex texture coordinates which are required for + sprite rendering. + Note that when geometry shaders are available, this state could be + removed. A special geometry shader defined by the state tracker could + converts the incoming points into quads with the proper texture coords. + +scissor + Whether the scissor test is enabled. + +multisample + Whether :ref:`MSAA` is enabled. + +bypass_vs_clip_and_viewport + Whether the entire TCL pipeline should be bypassed. This implies that + vertices are pre-transformed for the viewport, and will not be run + through the vertex shader. Note that implementations may still clip away + vertices that are not in the viewport. + +gl_rasterization_rules + Whether the rasterizer should use (0.5, 0.5) pixel centers. When not set, + the rasterizer will use (0, 0) for pixel centers. + + +Notes +----- + +flatshade +^^^^^^^^^ + +The actual interpolated shading algorithm is obviously +implementation-dependent, but will usually be Gourard for most hardware. + +bypass_vs_clip_and_viewport +^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +When set, this implies that vertices are pre-transformed for the viewport, and +will not be run through the vertex shader. Note that implementations may still +clip away vertices that are not visible. + +flatshade_first +^^^^^^^^^^^^^^^ + +There are several important exceptions to the specification of this rule. + +* ``PIPE_PRIMITIVE_POLYGON``: The provoking vertex is always the first + vertex. If the caller wishes to change the provoking vertex, they merely + need to rotate the vertices themselves. +* ``PIPE_PRIMITIVE_QUAD``, ``PIPE_PRIMITIVE_QUAD_STRIP``: This option has no + effect; the provoking vertex is always the last vertex. +* ``PIPE_PRIMITIVE_TRIANGLE_FAN``: When set, the provoking vertex is the + second vertex, not the first. This permits each segment of the fan to have + a different color. diff --git a/src/gallium/docs/source/cso/sampler.rst b/src/gallium/docs/source/cso/sampler.rst new file mode 100644 index 0000000000..e3f1757f57 --- /dev/null +++ b/src/gallium/docs/source/cso/sampler.rst @@ -0,0 +1,46 @@ +.. _sampler: + +Sampler +======= + +Texture units have many options for selecting texels from loaded textures; +this state controls an individual texture unit's texel-sampling settings. + +Texture coordinates are always treated as four-dimensional, and referred to +with the traditional (S, T, R, Q) notation. + +Members +------- + +XXX undocumented compare_mode, compare_func + +wrap_s + How to wrap the S coordinate. One of PIPE_TEX_WRAP. +wrap_t + How to wrap the T coordinate. One of PIPE_TEX_WRAP. +wrap_r + How to wrap the R coordinate. One of PIPE_TEX_WRAP. +min_img_filter + The filter to use when minifying texels. One of PIPE_TEX_FILTER. +min_mip_filter + The filter to use when minifying mipmapped textures. One of + PIPE_TEX_FILTER. +mag_img_filter + The filter to use when magnifying texels. One of PIPE_TEX_FILTER. +normalized_coords + Whether the texture coordinates are normalized. If normalized, they will + always be in [0, 1]. If not, they will be in the range of each dimension + of the loaded texture. +prefilter + XXX From the Doxy, "weird sampling state exposed by some APIs." Refine. +lod_bias + The bias to apply to the level of detail. +min_lod + Minimum level of detail, used to clamp LoD after bias. +max_lod + Maximum level of detail, used to clamp LoD after bias. +border_color + RGBA color used for out-of-bounds coordinates. +max_anisotropy + Maximum filtering to apply anisotropically to textures. Setting this to + 1.0 effectively disables anisotropic filtering. diff --git a/src/gallium/docs/source/cso/shader.rst b/src/gallium/docs/source/cso/shader.rst new file mode 100644 index 0000000000..0ee42c8787 --- /dev/null +++ b/src/gallium/docs/source/cso/shader.rst @@ -0,0 +1,12 @@ +.. _shader: + +Shader +====== + +One of the two types of shaders supported by Gallium. + +Members +------- + +tokens + A list of tgsi_tokens. |