Updated docs for GTECreateSpriteStamp and GTEAddSprite. Added docs for GTESetBG1Origin, GTEGetTileAt, GTEFillTileStore and GTERefresh
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Lucas Scharenbroich
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@ -1272,6 +1272,37 @@ style: toolref
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<p><tt>Word spriteID;</tt></p>
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<p><tt>Word vBuffAddr;</tt></p>
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</div>
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<div class="example">
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<h5>Sprite Descriptor</h5>
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<p>
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The sprite descriptor is a subset of the full sprite bitfield. Only the starting Tile Index and
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the size bits are used.
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</p>
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<p>
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When a sprite has a size greater than 8x8, the horizontal tiles are taken from the next tile index
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and the vertical tiles are taken from <tt>tileID + 32</tt>. This is why tile sheets should be saved
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with a width of 256 pixels.
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</p>
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<table class="bits bitfield">
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<colgroup span="3" style="background-color: #999;"></colgroup>
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<colgroup span="2" style="background-color: lightblue;"></colgroup>
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<colgroup span="2" style="background-color: #999;"></colgroup>
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<colgroup span="9" style="background-color: white;"></colgroup>
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<tbody>
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<tr>
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<td>15</td><td>14</td><td>13</td><td>12</td><td>11</td><td>10</td><td>9</td><td>8</td><td>7</td><td>6</td><td>5</td><td>4</td><td>3</td><td>2</td><td>1</td><td>0</td>
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</tr>
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</tbody>
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</table>
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<table class="bitfield-definitions">
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<tbody>
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<tr><td>Bits 0-8</td><td>tileIndex</td><td>The index of a tile in the current Tile Set that defines the top-left part of the sprite</td></tr>
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<tr><td>Bit 9-10</td><td>Reserved</td><td>Must be zero.</td></tr>
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<tr><td>Bits 11-12</td><td>fSpriteSize</td><td>Sets the size of the sprite<ul><li>00 - 8x8</li><li>01 - 8x16</li><li>10 - 16x8</li><li>11 - 16x16</li></ul></td></tr>
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<tr><td>Bit 13-15</td><td>Reserved</td><td>Must be zero.</td></tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="api">
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@ -1360,6 +1391,37 @@ style: toolref
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<p><tt>Word y;</tt></p>
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<p><tt>Word vBuffAddr;</tt></p>
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</div>
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<div class="example">
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<h5>Sprite Descriptor</h5>
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<p>
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The sprite descriptor defines the rendering properties of a sprite.
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</p>
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<p>
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When a sprite has a size greater than 8x8, the horizontal tiles are taken from the next tile index
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and the vertical tiles are taken from <tt>tileID + 32</tt>. This is why tile sheets should be saved
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with a width of 256 pixels.
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</p>
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<table class="bits bitfield">
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<colgroup span="2" style="background-color: #999;"></colgroup>
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<colgroup span="4" style="background-color: lightblue;"></colgroup>
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<colgroup span="9" style="background-color: white;"></colgroup>
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<tbody>
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<tr>
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<td>15</td><td>14</td><td>13</td><td>12</td><td>11</td><td>10</td><td>9</td><td>8</td><td>7</td><td>6</td><td>5</td><td>4</td><td>3</td><td>2</td><td>1</td><td>0</td>
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</tr>
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</tbody>
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</table>
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<table class="bitfield-definitions">
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<tbody>
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<tr><td>Bits 0-8</td><td>tileIndex</td><td>The index of a tile in the current Tile Set that defines the top-left part of the sprite</td></tr>
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<tr><td>Bit 9</td><td>fSpriteHorzFlip</td><td>Flips the sprite horizontally.</td></tr>
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<tr><td>Bit 10</td><td>fSpriteVertFlip</td><td>Flips the sprite vertically.</td></tr>
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<tr><td>Bits 11-12</td><td>fSpriteSize</td><td>Sets the size of the sprite<ul><li>00 - 8x8</li><li>01 - 8x16</li><li>10 - 16x8</li><li>11 - 16x16</li></ul></td></tr>
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<tr><td>Bit 13</td><td>fSpriteHide</td><td>When set, does not render the sprite.</td></tr>
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<tr><td>Bit 14-15</td><td>Reserved</td><td>Must be zero.</td></tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="api">
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@ -1933,7 +1995,9 @@ style: toolref
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<div class="api">
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<h4 class="tn">$19XX</h4>
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<h4>GTEGetBG0TileMapInfo</h4>
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<p></p>
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<p>
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Returns information about the current BG0 tile map.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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@ -2021,7 +2085,9 @@ style: toolref
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<div class="api">
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<h4 class="tn">$1AXX</h4>
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<h4>GTEGetScreenInfo</h4>
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<p></p>
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<p>
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Returns information about the current position and size of the play field.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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@ -2119,7 +2185,10 @@ style: toolref
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<div class="api">
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<h4 class="tn">$1BXX</h4>
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<h4>GTESetBG1Origin</h4>
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<p></p>
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<p>
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Sets the coordinate of the upper-left corner of the playfield within the secondary background buffer. The coordiate values
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are <em>unsigned</em>, so transitioning from 0 to -1 will result in a discontinuous jump in the background position.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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<table class="stack">
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@ -2135,6 +2204,18 @@ style: toolref
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot"></td>
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xpos
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<td></td>
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<td><em>Word</em>—Unsigned horizontal position</td>
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</tr>
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<tr>
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<td class="bot"></td>
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ypos
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<td></td>
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<td><em>Word</em>—Unsigned vertical position</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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@ -2169,13 +2250,19 @@ style: toolref
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</div>
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<div class="section">
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<h5>C</h5>
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<p><tt>extern pascal void GTESetBG1Origin(x, y)</tt></p>
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<p><tt>Word x;</tt></p>
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<p><tt>Word y;</tt></p>
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</div>
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</div>
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<div class="api">
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<h4 class="tn">$1CXX</h4>
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<h4>GTEGetTileAt</h4>
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<p></p>
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<p>
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Returns the tile at a local coordinate poiint. The primary use of this function is to lookup
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a Tile ID using a sprite's coordinates.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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<table class="stack">
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@ -2191,6 +2278,21 @@ style: toolref
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot">wordspace</td>
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<td></td>
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<td><em>Word</em>—Space for result</td>
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</tr>
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<tr>
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<td class="bot">x</td>
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<td></td>
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<td><em>Word</em>—Local play field horizontal coordinate</td>
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</tr>
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<tr>
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<td class="bot">y</td>
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<td></td>
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<td><em>Word</em>—Local play field vertical coordinate</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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@ -2212,6 +2314,11 @@ style: toolref
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot">TileID</td>
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<td></td>
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<td><em>Word</em>—Tile ID at the play field coordinates.</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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@ -2225,6 +2332,9 @@ style: toolref
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</div>
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<div class="section">
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<h5>C</h5>
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<p><tt>extern pascal Word GTEGetTileAt(x, y)</tt></p>
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<p><tt>Word x;</tt></p>
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<p><tt>Word y;</tt></p>
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</div>
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</div>
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@ -2679,7 +2789,9 @@ style: toolref
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<div class="api">
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<h4 class="tn">$25XX</h4>
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<h4>GTEFillTileStore</h4>
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<p></p>
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<p>
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Fills the entire Tile Store with a specific Tile ID value.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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<table class="stack">
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@ -2695,6 +2807,11 @@ style: toolref
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot">tileID</td>
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<td></td>
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<td><em>Word</em>—Tile ID to store into the tile store memory.</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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@ -2729,62 +2846,30 @@ style: toolref
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</div>
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<div class="section">
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<h5>C</h5>
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<p><tt>extern pascal void GTEFillTileStore(tileID)</tt></p>
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<p><tt>Word tileID;</tt></p>
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</div>
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</div>
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<div class="api">
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<h4 class="tn">$26XX</h4>
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<h4>GTERefresh</h4>
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<p></p>
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<p>
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Forces a refresh of the play field. This is implemented by adding all of the visible tiles to the dirty tile
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queue which will force them to be redrawn on the next call to <tt>GTERender()</tt>.
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</p>
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<div class="section">
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<h5>Parameters</h5>
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<table class="stack">
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<colgroup>
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<col class="col-1">
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<col class="col-2">
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<col class="col-3">
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</colgroup>
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<tbody>
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<tr>
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<th>Stack before call</th>
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</tr>
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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<td><em>SP</em></td>
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</tr>
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</tbody>
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</table>
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<table class="stack">
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<colgroup>
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<col class="col-1">
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<col class="col-2">
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<col class="col-3">
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</colgroup>
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<tbody>
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<tr>
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<th>Stack after call</th>
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</tr>
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<tr>
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<td class="top">previous contents</td>
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</tr>
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<tr>
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<td class="bot"></td>
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<td><em>←</em></td>
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<td><em>SP</em></td>
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</tr>
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</tbody>
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</table>
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<p>
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The stack is not affected by this call. There are no input or output parameters.
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</p>
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</div>
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<div class="section">
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<h5>Errors</h5>
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</div>
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<div class="section">
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<h5>C</h5>
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<p><tt>extern pascal void GTERefresh()</tt></p>
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</div>
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</div>
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