diff options
Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/context.rst | 25 | ||||
| -rw-r--r-- | src/gallium/docs/source/cso/rasterizer.rst | 24 |
2 files changed, 41 insertions, 8 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst index b0229c70f20..25a3245066c 100644 --- a/src/gallium/docs/source/context.rst +++ b/src/gallium/docs/source/context.rst @@ -179,16 +179,25 @@ the mode of the primitive and the vertices to be fetched, in the range between Every instance with instanceID in the range between ``start_instance`` and ``start_instance``+``instance_count``-1, inclusive, will be drawn. -All vertex indices must fall inside the range given by ``min_index`` and -``max_index``. In case non-indexed draw, ``min_index`` should be set to +If there is an index buffer bound, and ``indexed`` field is true, all vertex +indices will be looked up in the index buffer. + +In indexed draw, ``min_index`` and ``max_index`` respectively provide a lower +and upper bound of the indices contained in the index buffer inside the range +between ``start`` to ``start``+``count``-1. This allows the driver to +determine which subset of vertices will be referenced during te draw call +without having to scan the index buffer. Providing a over-estimation of the +the true bounds, for example, a ``min_index`` and ``max_index`` of 0 and +0xffffffff respectively, must give exactly the same rendering, albeit with less +performance due to unreferenced vertex buffers being unnecessarily DMA'ed or +processed. Providing a underestimation of the true bounds will result in +undefined behavior, but should not result in program or system failure. + +In case of non-indexed draw, ``min_index`` should be set to ``start`` and ``max_index`` should be set to ``start``+``count``-1. -``index_bias`` is a value added to every vertex index before fetching vertex -attributes. It does not affect ``min_index`` and ``max_index``. - -If there is an index buffer bound, and ``indexed`` field is true, all vertex -indices will be looked up in the index buffer. ``min_index``, ``max_index``, -and ``index_bias`` apply after index lookup. +``index_bias`` is a value added to every vertex index after lookup and before +fetching vertex attributes. When drawing indexed primitives, the primitive restart index can be used to draw disjoint primitive strips. For example, several separate diff --git a/src/gallium/docs/source/cso/rasterizer.rst b/src/gallium/docs/source/cso/rasterizer.rst index d547055096f..e10c16ed900 100644 --- a/src/gallium/docs/source/cso/rasterizer.rst +++ b/src/gallium/docs/source/cso/rasterizer.rst @@ -7,6 +7,30 @@ 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. +Linkage + +clamp_vertex_color +^^^^^^^^^^^^^^^^^^ + +If set, TGSI_SEMANTIC_COLOR registers are clamped to the [0, 1] range after +the execution of the vertex shader, before being passed to the geometry +shader or fragment shader. + +OpenGL: glClampColor(GL_CLAMP_VERTEX_COLOR) in GL 3.0 or GL_ARB_color_buffer_float + +D3D11: seems always disabled + +clamp_fragment_color +^^^^^^^^^^^^^^^^^^^^ + +Controls whether TGSI_SEMANTIC_COLOR outputs of the fragment shader +are clamped to [0, 1]. + +OpenGL: glClampColor(GL_CLAMP_FRAGMENT_COLOR) in GL 3.0 or ARB_color_buffer_float + +D3D11: seems always disabled + + Shading ------- |