54 lines
1.2 KiB
GLSL
54 lines
1.2 KiB
GLSL
;------------------------------------------------------------------------------
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; Vertex components (as specified in the vertex DECL)
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; v0 = pVertex[i].p
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; v1 = pVertex[i].n
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; v2 = pVertex[i].t0
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; v3 = pVertex[i].basis.vTangent;
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;------------------------------------------------------------------------------
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xvs.1.1
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#include "../win32/shader_constants.h"
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#pragma screenspace
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; Transform position for world, view, and projection matrices
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m4x4 oPos, v0, c[CV_WORLDVIEWPROJ_0]
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; Multiply by 1/w and add viewport offset.
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; r12 is a read-only alias for oPos.
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rcc r1.x, r12.w
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mad oPos.xyz, r12, r1.x, c[CV_VIEWPORT_OFFSETS]
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; Generate binormal vector
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mov r7, v3
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mul r8, r7.yzxw, v1.zxyw
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mad r8, -r7.zxyw, v1.yzxw, r8
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; Get the light vector
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mov r10, c[CV_LIGHT_DIRECTION]
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; Move the light vector into tangent space
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; Put into T1
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dp3 oT1.x, r10, v3
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dp3 oT1.y, r10, r8
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dp3 oT1.z, r10, v1
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; Get the vector toward the camera
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mov r2, -c[CV_CAMERA_DIRECTION]
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; Get the half angle
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add r2.xyz, r2.xyz, r10.xyz
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; Normalize half angle
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dp3 r11.x, r2.xyz, r2.xyz
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rsq r11.xyz, r11.x
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mul r2.xyz, r2.xyz, r11.xyz
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; Move the half angle into tangent space
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dp3 oT2.x, r2, v3
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dp3 oT2.y, r2, r8
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dp3 oT2.z, r2, v1
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; Move the bump map coordinates into t0
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mov oT0.xyz, v2
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