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61 lines
1.4 KiB
61 lines
1.4 KiB
4 years ago
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vs.1.1
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// Grass shader. Moves verts according sine waves seeded by position
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// Based on the article "Animated Grass with Pixel and Vertex Shaders"
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// by John Isidoro and Drew Card, in the book
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// "Direct3D ShaderX Vertex and Pixel Shader Tips and Tricks"
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// c0 = Local2NDC
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// c4 = (0.0, 0.5, 1.0, 2.0)
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// c5 = (time, X, X, X)
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// c6 = Pi constants
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// c7 = Sin constants (-1/3!, 1/!5, -1/7!, 1/9!)
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// c8 = waveDistortX
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// c9 = waveDistortY
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// c10 = waveDistortZ
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// c11 = waveDirX (0.25, 0.0, -0.7, -0.8)
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// c12 = waveDirY (0.0, 0.15, -0.7, 0.1)
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// c13 = waveSpeed (0.2, 0.15, 0.4, 0.4)
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dcl_position v0
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dcl_color v5
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dcl_texcoord0 v7
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mul r0, c11, v0.x // pos X,Y input to waves
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mad r0, c12, v0.y, r0
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mov r1, c5.x // time
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mad r0, r1, c13, r0 // scale by speed and add to X,Y input
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frc r0.xy, r0
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frc r1.xy, r0.zwzw
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mov r0.zw, r1.xyxy
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sub r0, r0, c4.y // - 0.5
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mul r1, r0, c6.w // *= 2 pi
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mul r2, r1, r1 // ^2
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mul r3, r2, r1 // ^3
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mul r5, r3, r2 // ^5
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mul r7, r5, r2 // ^7
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mul r9, r7, r2 // ^9
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mad r0, r3, c7.x, r1 // - r1^3 / 3!
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mad r0, r5, c7.y, r0 // + r1^5 / 5!
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mad r0, r7, c7.z, r0 // - r1^7 / 7!
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mad r0, r9, c7.w, r0 // + r1^9 / 9!
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dp4 r3.x, r0, c8
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dp4 r3.y, r0, c9
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dp4 r3.zw, r0, c10
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sub r4, c4.z, v7.y
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mul r3, r3, r4 // mult by Y tex coord. So the waves only affect the top verts
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mov r2.w, v0 //
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add r2.xyz, r3, v0 // add offset to position
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m4x4 oPos, r2, c0 // trans to NDC
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mov oFog, c4.z // no fog
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mov oD0, v5
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mov oT0, v7
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