Initial commit.

code/x_shaders/shadow.vsh

@@ -0,0 +1,30 @@
+;------------------------------------------------------------------------------
+; Vertex components (as specified in the vertex DECL)
+;    v0  = pVertex[i].p
+;    v1  = extrusion determinant
+;------------------------------------------------------------------------------
+xvs.1.1
+     
+#include "../win32/shader_constants.h"  
+
+#pragma screenspace
+
+; Determine the distance to the ground
+add r4, v0, c[CV_SHADOW_FACTORS]
+sub r5, r4, c[CV_SHADOW_PLANE]
+
+; Factor in the extrusion determinant
+; r3 will either be the distance to the ground, or 0
+mul r3, v1.x, -r5
+  
+; Extrude the vertex if necessary
+mad r0, r3.z, c[CV_LIGHT_DIRECTION].xyz, v0.xyz
+mov r0.w, v0.w
+ 
+; transform to hclip space
+m4x4 oPos, r0, c[CV_WORLDVIEWPROJ_0]
+ 
+; Multiply by 1/w and add viewport offset.
+; r12 is a read-only alias for oPos.
+rcc r1.x, r12.w
+mad oPos.xyz, r12, r1.x, c[CV_VIEWPORT_OFFSETS]