LGram16
dd97ddec92
Move git root from Client/ to src/ to track all source code: - Client: Game client source (moved to Client/Client/) - Server: Game server source - GameTools: Development tools - CryptoSource: Encryption utilities - database: Database scripts - Script: Game scripts - rylCoder_16.02.2008_src: Legacy coder tools - GMFont, Game: Additional resources 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
77 lines
1.5 KiB
Plaintext
77 lines
1.5 KiB
Plaintext
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// Declare pixel shader version
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ps.1.1
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//RGBA
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def c6, 0.0, 0.0, 1.0, 0.0
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// Define constant for biasing back from [-0.5,0.5]
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// to [0,1]
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def c7, 0.5, 0.5, 0.5, 0.5
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// Get colors from all 4 texture stages
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tex t0 // 1st texel
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tex t1 // 2nd texel
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tex t2 // etc.
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tex t3
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// We could to this:
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//PCN_MULTFACTOR 0
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// mul r0, c[0], t0
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// mad r1, c[0], t1, r0
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// mad r0, c[0], t2, r1
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// mad r0, c[0], t3, r0
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//
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// But that would loose low bits of precision, so instead
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// we bias to 9 bit signed components and operate on those,
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// shifting the end result back to the [0,1] unsigned range
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// This is so that when averaging values of say,
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// 1.0 and 1.0 the result will still be 1.0
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// instead of saturating at 1.0 and being divided
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// down to 0.5 for the average.
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// The use of bias means that a value of 0.5 (127)
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// stored in the texture actualy represents the
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// value zero when doing the pixel math,
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// Average the first two, then the second two
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add_d2 r0, t0_bias, t1_bias
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add_d2 r1, t2_bias, t3_bias
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// Average the averages.
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// Result is still in [-.5, .5] range
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add_d2 r1, r0, r1
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// Bring back to the [0,1] range
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add r0, r1, c7
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// It would be nice to preserve the un-filtered
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// velocity, but we don't have a sample over the
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// center texel and we're writing to a new color
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// buffer, so no luck there.
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//////////////////////////////////////////
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// Replicate blue into alpha so that both
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// contain the same position.
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// replicate blue to all channels of r1
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dp3 r1.rgba, r0, c6
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// Update alpha of destination
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mov r0.a, r1.a
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