mirror of
https://github.com/SWG-Source/clientdata_OLD.git
synced 2026-07-14 00:01:59 -04:00
52 lines
1.3 KiB
V Shell
Executable File
52 lines
1.3 KiB
V Shell
Executable File
//asm
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#define maxTextureCoordinate 0
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#define vTextureCoordinateSetMAIN vTextureCoordinateSet0
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TARGET
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#include "vertex_program/modules/registers.inc"
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dcl_position0 vPosition
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#include "vertex_program/modules/texture_coordinates.inc"
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//-- transform the vertex position into camera space
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m4x4 oPos, vPosition, cObjectWorldCameraProjectionMatrix
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// -- transform vertex position into world space
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m4x3 r9.xyz, vPosition, cObjectWorldMatrix
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// -- calculate the direction to the viewer
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sub r11.xyz, cCameraPosition, r9
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dp3 r11.w, r11, r11
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rsq r0.w, r11.w
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mul r11.xyz, r11, r0.w
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// -- calculate fog
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// (distance)^2 * (density)^2 =
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// (distance * density)^2
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mul r0.w, r11.w, cFog.w
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// log2(e) * (distance * density)^2
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mul r0.w, cLog2e, r0.w
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// 2^(log2(e) * (distance * density)^2) =
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// (2^log2(e))^((distance * density)^2)
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// e^((distance * density)^2)
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exp r0.w, r0.w
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// 1 / (e^((distance * density)^2))
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rcp oFog, r0.w
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mov r1, c0_5
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mul r1, r1, r1
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mul r1, r1, r1
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mul r2, r1, cCurrentTime
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add oT0.x, vTextureCoordinateSetMAIN.x, r2
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add oT0.y, vTextureCoordinateSetMAIN.y, r2
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add oT1.x, vTextureCoordinateSetMAIN.x, r2
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add oT1.y, vTextureCoordinateSetMAIN.y, r2
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//-- compute alpha
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mov oD0, c1_0
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mov oD0.w, cUserConstant.x
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