diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/docs/build/html/_sources/tgsi.txt | 91 | ||||
| -rw-r--r-- | src/gallium/docs/build/html/searchindex.js | 2 | ||||
| -rw-r--r-- | src/gallium/docs/build/html/tgsi.html | 87 | ||||
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 91 |
4 files changed, 252 insertions, 19 deletions
diff --git a/src/gallium/docs/build/html/_sources/tgsi.txt b/src/gallium/docs/build/html/_sources/tgsi.txt index 86c09046f7..12687f29dc 100644 --- a/src/gallium/docs/build/html/_sources/tgsi.txt +++ b/src/gallium/docs/build/html/_sources/tgsi.txt @@ -1180,11 +1180,92 @@ Declaration Semantic The meanings of the individual semantic names are explained in the following sections. +TGSI_SEMANTIC_POSITION +"""""""""""""""""""""" -FACE -"""" +Position, sometimes known as HPOS or WPOS for historical reasons, is the +location of the vertex in space, in ``(x, y, z, w)`` format. ``x``, ``y``, and ``z`` +are the Cartesian coordinates, and ``w`` is the homogenous coordinate and used +for the perspective divide, if enabled. - Valid only in a fragment shader INPUT declaration. +As a vertex shader output, position should be scaled to the viewport. When +used in fragment shaders, position will --- - FACE.x is negative when the primitive is back facing. FACE.x is positive - when the primitive is front facing. +XXX --- wait a minute. Should position be in [0,1] for x and y? + +XXX additionally, is there a way to configure the perspective divide? it's +accelerated on most chipsets AFAIK... + +Position, if not specified, usually defaults to ``(0, 0, 0, 1)``, and can +be partially specified as ``(x, y, 0, 1)`` or ``(x, y, z, 1)``. + +XXX usually? can we solidify that? + +TGSI_SEMANTIC_COLOR +""""""""""""""""""" + +Colors are used to, well, color the primitives. Colors are always in +``(r, g, b, a)`` format. + +If alpha is not specified, it defaults to 1. + +TGSI_SEMANTIC_BCOLOR +"""""""""""""""""""" + +Back-facing colors are only used for back-facing polygons, and are only valid +in vertex shader outputs. After rasterization, all polygons are front-facing +and COLOR and BCOLOR end up occupying the same slots in the fragment, so +all BCOLORs effectively become regular COLORs in the fragment shader. + +TGSI_SEMANTIC_FOG +""""""""""""""""" + +The fog coordinate historically has been used to replace the depth coordinate +for generation of fog in dedicated fog blocks. Gallium, however, does not use +dedicated fog acceleration, placing it entirely in the fragment shader +instead. + +The fog coordinate should be written in ``(f, 0, 0, 1)`` format. Only the first +component matters when writing from the vertex shader; the driver will ensure +that the coordinate is in this format when used as a fragment shader input. + +TGSI_SEMANTIC_PSIZE +""""""""""""""""""" + +PSIZE, or point size, is used to specify point sizes per-vertex. It should +be in ``(p, n, x, f)`` format, where ``p`` is the point size, ``n`` is the minimum +size, ``x`` is the maximum size, and ``f`` is the fade threshold. + +XXX this is arb_vp. is this what we actually do? should double-check... + +When using this semantic, be sure to set the appropriate state in the +:ref:`rasterizer` first. + +TGSI_SEMANTIC_GENERIC +""""""""""""""""""""" + +Generic semantics are nearly always used for texture coordinate attributes, +in ``(s, t, r, q)`` format. ``t`` and ``r`` may be unused for certain kinds +of lookups, and ``q`` is the level-of-detail bias for biased sampling. + +These attributes are called "generic" because they may be used for anything +else, including parameters, texture generation information, or anything that +can be stored inside a four-component vector. + +TGSI_SEMANTIC_NORMAL +"""""""""""""""""""" + +XXX no clue. + +TGSI_SEMANTIC_FACE +"""""""""""""""""" + +FACE is the facing bit, to store the facing information for the fragment +shader. ``(f, 0, 0, 1)`` is the format. The first component will be positive +when the fragment is front-facing, and negative when the component is +back-facing. + +TGSI_SEMANTIC_EDGEFLAG +"""""""""""""""""""""" + +XXX no clue diff --git a/src/gallium/docs/build/html/searchindex.js b/src/gallium/docs/build/html/searchindex.js index c3c0b876ea..0e3f2bb4a2 100644 --- a/src/gallium/docs/build/html/searchindex.js +++ b/src/gallium/docs/build/html/searchindex.js @@ -1 +1 @@ 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\ No newline at end of file diff --git a/src/gallium/docs/build/html/tgsi.html b/src/gallium/docs/build/html/tgsi.html index 0dac00f25e..7954e1de40 100644 --- a/src/gallium/docs/build/html/tgsi.html +++ b/src/gallium/docs/build/html/tgsi.html @@ -861,13 +861,76 @@ is 0.</p> <p>The meanings of the individual semantic names are explained in the following sections.</p> </blockquote> -<div class="section" id="face"> -<h4>FACE<a class="headerlink" href="#face" title="Permalink to this headline">¶</a></h4> -<blockquote> -<p>Valid only in a fragment shader INPUT declaration.</p> -<p>FACE.x is negative when the primitive is back facing. FACE.x is positive -when the primitive is front facing.</p> -</blockquote> +<div class="section" id="tgsi-semantic-position"> +<h4>TGSI_SEMANTIC_POSITION<a class="headerlink" href="#tgsi-semantic-position" title="Permalink to this headline">¶</a></h4> +<p>Position, sometimes known as HPOS or WPOS for historical reasons, is the +location of the vertex in space, in <tt class="docutils literal"><span class="pre">(x,</span> <span class="pre">y,</span> <span class="pre">z,</span> <span class="pre">w)</span></tt> format. <tt class="docutils literal"><span class="pre">x</span></tt>, <tt class="docutils literal"><span class="pre">y</span></tt>, and <tt class="docutils literal"><span class="pre">z</span></tt> +are the Cartesian coordinates, and <tt class="docutils literal"><span class="pre">w</span></tt> is the homogenous coordinate and used +for the perspective divide, if enabled.</p> +<p>As a vertex shader output, position should be scaled to the viewport. When +used in fragment shaders, position will —</p> +<p>XXX — wait a minute. Should position be in [0,1] for x and y?</p> +<p>XXX additionally, is there a way to configure the perspective divide? it’s +accelerated on most chipsets AFAIK...</p> +<p>Position, if not specified, usually defaults to <tt class="docutils literal"><span class="pre">(0,</span> <span class="pre">0,</span> <span class="pre">0,</span> <span class="pre">1)</span></tt>, and can +be partially specified as <tt class="docutils literal"><span class="pre">(x,</span> <span class="pre">y,</span> <span class="pre">0,</span> <span class="pre">1)</span></tt> or <tt class="docutils literal"><span class="pre">(x,</span> <span class="pre">y,</span> <span class="pre">z,</span> <span class="pre">1)</span></tt>.</p> +<p>XXX usually? can we solidify that?</p> +</div> +<div class="section" id="tgsi-semantic-color"> +<h4>TGSI_SEMANTIC_COLOR<a class="headerlink" href="#tgsi-semantic-color" title="Permalink to this headline">¶</a></h4> +<p>Colors are used to, well, color the primitives. Colors are always in +<tt class="docutils literal"><span class="pre">(r,</span> <span class="pre">g,</span> <span class="pre">b,</span> <span class="pre">a)</span></tt> format.</p> +<p>If alpha is not specified, it defaults to 1.</p> +</div> +<div class="section" id="tgsi-semantic-bcolor"> +<h4>TGSI_SEMANTIC_BCOLOR<a class="headerlink" href="#tgsi-semantic-bcolor" title="Permalink to this headline">¶</a></h4> +<p>Back-facing colors are only used for back-facing polygons, and are only valid +in vertex shader outputs. After rasterization, all polygons are front-facing +and COLOR and BCOLOR end up occupying the same slots in the fragment, so +all BCOLORs effectively become regular COLORs in the fragment shader.</p> +</div> +<div class="section" id="tgsi-semantic-fog"> +<h4>TGSI_SEMANTIC_FOG<a class="headerlink" href="#tgsi-semantic-fog" title="Permalink to this headline">¶</a></h4> +<p>The fog coordinate historically has been used to replace the depth coordinate +for generation of fog in dedicated fog blocks. Gallium, however, does not use +dedicated fog acceleration, placing it entirely in the fragment shader +instead.</p> +<p>The fog coordinate should be written in <tt class="docutils literal"><span class="pre">(f,</span> <span class="pre">0,</span> <span class="pre">0,</span> <span class="pre">1)</span></tt> format. Only the first +component matters when writing from the vertex shader; the driver will ensure +that the coordinate is in this format when used as a fragment shader input.</p> +</div> +<div class="section" id="tgsi-semantic-psize"> +<h4>TGSI_SEMANTIC_PSIZE<a class="headerlink" href="#tgsi-semantic-psize" title="Permalink to this headline">¶</a></h4> +<p>PSIZE, or point size, is used to specify point sizes per-vertex. It should +be in <tt class="docutils literal"><span class="pre">(p,</span> <span class="pre">n,</span> <span class="pre">x,</span> <span class="pre">f)</span></tt> format, where <tt class="docutils literal"><span class="pre">p</span></tt> is the point size, <tt class="docutils literal"><span class="pre">n</span></tt> is the minimum +size, <tt class="docutils literal"><span class="pre">x</span></tt> is the maximum size, and <tt class="docutils literal"><span class="pre">f</span></tt> is the fade threshold.</p> +<p>XXX this is arb_vp. is this what we actually do? should double-check...</p> +<p>When using this semantic, be sure to set the appropriate state in the +<a class="reference external" href="cso/rasterizer.html#rasterizer"><em>Rasterizer</em></a> first.</p> +</div> +<div class="section" id="tgsi-semantic-generic"> +<h4>TGSI_SEMANTIC_GENERIC<a class="headerlink" href="#tgsi-semantic-generic" title="Permalink to this headline">¶</a></h4> +<p>Generic semantics are nearly always used for texture coordinate attributes, +in <tt class="docutils literal"><span class="pre">(s,</span> <span class="pre">t,</span> <span class="pre">r,</span> <span class="pre">q)</span></tt> format. <tt class="docutils literal"><span class="pre">t</span></tt> and <tt class="docutils literal"><span class="pre">r</span></tt> may be unused for certain kinds +of lookups, and <tt class="docutils literal"><span class="pre">q</span></tt> is the level-of-detail bias for biased sampling.</p> +<p>These attributes are called “generic” because they may be used for anything +else, including parameters, texture generation information, or anything that +can be stored inside a four-component vector.</p> +</div> +<div class="section" id="tgsi-semantic-normal"> +<h4>TGSI_SEMANTIC_NORMAL<a class="headerlink" href="#tgsi-semantic-normal" title="Permalink to this headline">¶</a></h4> +<p>XXX no clue.</p> +</div> +<div class="section" id="tgsi-semantic-face"> +<h4>TGSI_SEMANTIC_FACE<a class="headerlink" href="#tgsi-semantic-face" title="Permalink to this headline">¶</a></h4> +<p>FACE is the facing bit, to store the facing information for the fragment +shader. <tt class="docutils literal"><span class="pre">(f,</span> <span class="pre">0,</span> <span class="pre">0,</span> <span class="pre">1)</span></tt> is the format. The first component will be positive +when the fragment is front-facing, and negative when the component is +back-facing.</p> +</div> +<div class="section" id="tgsi-semantic-edgeflag"> +<h4>TGSI_SEMANTIC_EDGEFLAG<a class="headerlink" href="#tgsi-semantic-edgeflag" title="Permalink to this headline">¶</a></h4> +<p>XXX no clue</p> </div> </div> </div> @@ -898,7 +961,15 @@ when the primitive is front facing.</p> </li> <li><a class="reference external" href="#other-tokens">Other tokens</a><ul> <li><a class="reference external" href="#declaration-semantic">Declaration Semantic</a><ul> -<li><a class="reference external" href="#face">FACE</a></li> +<li><a class="reference external" href="#tgsi-semantic-position">TGSI_SEMANTIC_POSITION</a></li> +<li><a class="reference external" href="#tgsi-semantic-color">TGSI_SEMANTIC_COLOR</a></li> +<li><a class="reference external" href="#tgsi-semantic-bcolor">TGSI_SEMANTIC_BCOLOR</a></li> +<li><a class="reference external" href="#tgsi-semantic-fog">TGSI_SEMANTIC_FOG</a></li> +<li><a class="reference external" href="#tgsi-semantic-psize">TGSI_SEMANTIC_PSIZE</a></li> +<li><a class="reference external" href="#tgsi-semantic-generic">TGSI_SEMANTIC_GENERIC</a></li> +<li><a class="reference external" href="#tgsi-semantic-normal">TGSI_SEMANTIC_NORMAL</a></li> +<li><a class="reference external" href="#tgsi-semantic-face">TGSI_SEMANTIC_FACE</a></li> +<li><a class="reference external" href="#tgsi-semantic-edgeflag">TGSI_SEMANTIC_EDGEFLAG</a></li> </ul> </li> </ul> diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index 86c09046f7..12687f29dc 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -1180,11 +1180,92 @@ Declaration Semantic The meanings of the individual semantic names are explained in the following sections. +TGSI_SEMANTIC_POSITION +"""""""""""""""""""""" -FACE -"""" +Position, sometimes known as HPOS or WPOS for historical reasons, is the +location of the vertex in space, in ``(x, y, z, w)`` format. ``x``, ``y``, and ``z`` +are the Cartesian coordinates, and ``w`` is the homogenous coordinate and used +for the perspective divide, if enabled. - Valid only in a fragment shader INPUT declaration. +As a vertex shader output, position should be scaled to the viewport. When +used in fragment shaders, position will --- - FACE.x is negative when the primitive is back facing. FACE.x is positive - when the primitive is front facing. +XXX --- wait a minute. Should position be in [0,1] for x and y? + +XXX additionally, is there a way to configure the perspective divide? it's +accelerated on most chipsets AFAIK... + +Position, if not specified, usually defaults to ``(0, 0, 0, 1)``, and can +be partially specified as ``(x, y, 0, 1)`` or ``(x, y, z, 1)``. + +XXX usually? can we solidify that? + +TGSI_SEMANTIC_COLOR +""""""""""""""""""" + +Colors are used to, well, color the primitives. Colors are always in +``(r, g, b, a)`` format. + +If alpha is not specified, it defaults to 1. + +TGSI_SEMANTIC_BCOLOR +"""""""""""""""""""" + +Back-facing colors are only used for back-facing polygons, and are only valid +in vertex shader outputs. After rasterization, all polygons are front-facing +and COLOR and BCOLOR end up occupying the same slots in the fragment, so +all BCOLORs effectively become regular COLORs in the fragment shader. + +TGSI_SEMANTIC_FOG +""""""""""""""""" + +The fog coordinate historically has been used to replace the depth coordinate +for generation of fog in dedicated fog blocks. Gallium, however, does not use +dedicated fog acceleration, placing it entirely in the fragment shader +instead. + +The fog coordinate should be written in ``(f, 0, 0, 1)`` format. Only the first +component matters when writing from the vertex shader; the driver will ensure +that the coordinate is in this format when used as a fragment shader input. + +TGSI_SEMANTIC_PSIZE +""""""""""""""""""" + +PSIZE, or point size, is used to specify point sizes per-vertex. It should +be in ``(p, n, x, f)`` format, where ``p`` is the point size, ``n`` is the minimum +size, ``x`` is the maximum size, and ``f`` is the fade threshold. + +XXX this is arb_vp. is this what we actually do? should double-check... + +When using this semantic, be sure to set the appropriate state in the +:ref:`rasterizer` first. + +TGSI_SEMANTIC_GENERIC +""""""""""""""""""""" + +Generic semantics are nearly always used for texture coordinate attributes, +in ``(s, t, r, q)`` format. ``t`` and ``r`` may be unused for certain kinds +of lookups, and ``q`` is the level-of-detail bias for biased sampling. + +These attributes are called "generic" because they may be used for anything +else, including parameters, texture generation information, or anything that +can be stored inside a four-component vector. + +TGSI_SEMANTIC_NORMAL +"""""""""""""""""""" + +XXX no clue. + +TGSI_SEMANTIC_FACE +"""""""""""""""""" + +FACE is the facing bit, to store the facing information for the fragment +shader. ``(f, 0, 0, 1)`` is the format. The first component will be positive +when the fragment is front-facing, and negative when the component is +back-facing. + +TGSI_SEMANTIC_EDGEFLAG +"""""""""""""""""""""" + +XXX no clue |