44 lines
1.2 KiB
HTML
44 lines
1.2 KiB
HTML
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<html>
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<head>
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<title>Bitmap Font Generator - Documentation</title>
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</head>
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<body>
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<h1>Bitmap Font Generator - Documentation</h1>
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<p><a href="../documentation.html">Back to main page</a></p>
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<h2>Pixel shader example</h2>
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<p>This pixel shader shows how to decode the color from a font texture with characters packed
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into all 4 channels, and each channel using special encoding to store the character with the
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outline. The texture is also allowed to store full 32bit images for some characters.</p>
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<pre>
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// DirectX 9 pixel shader
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float4 PixScene( float4 color : COLOR0,
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int4 chnl : TEXCOORD1,
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float2 tex0 : TEXCOORD0 ) : COLOR0
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{
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float4 pixel = tex2D(g_samScene, tex0);
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if( dot(vector(1,1,1,1), chnl) )
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{
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float val = dot(pixel, chnl);
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pixel.rgb = val > 0.5 ? 2*val-1 : 0;
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pixel.a = val > 0.5 ? 1 : 2*val;
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}
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return pixel * color;
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}
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</pre>
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<p>The chnl texture coordinate is a 4D vector that shows which channel the character should be read
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from. If this is (0,0,0,0) the character is interpreted as a 32 bit image. The texture coordinate
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can be stored in a UBYTE4 type, so it doesn't require much bandwidth when being sent to the video card.</p>
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</body>
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</html>
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