Initial commit.

code/x_shaders/rain.vsh

@@ -0,0 +1,59 @@
+;------------------------------------------------------------------------------
+; Vertex components (as specified in the vertex DECL)
+;    v0  = vPosition
+;    v1  = vFields
+;    v2  = vTex
+;------------------------------------------------------------------------------
+xvs.1.1
+
+#define LEFT		r6
+#define DOWN		r7
+#define TEMPPOS		r8
+#define TEMP		r9
+#define TEMPALPHA	r10
+
+#define CV_ONE				1
+#define CV_WORLDVIEWPROJ_0	2
+#define CV_WORLDVIEWPROJ_1	3
+#define CV_WORLDVIEWPROJ_2	4
+#define CV_WORLDVIEWPROJ_3	5
+#define CV_ALPHA			20
+#define CV_FADEALPHA		21
+#define CV_LEFT				26
+#define CV_DOWN				27
+
+
+; get possible alpha source
+; alpha = mAlpha * (pos.y / -item->pos.z);
+;rcp r10.x, -v0.z
+;mul r10.x, v2.z, r10.x
+;mul r10.x, c[CV_ALPHA].w, r10.x
+
+; if (alpha > mAlpha) alpha = mAlpha
+;min r10.x, r10.x, c[CV_ALPHA].w
+
+; set the constant color to add alpha to
+mov oD0, c[CV_ONE]
+
+; set the alpha fade
+;mov r11.w, c[CV_ALPHA].w
+;mul oD0.w, c[CV_FADEALPHA].w, r10.x
+mov oD0.w, v2.z
+
+; Pass thru the tex coords
+mov oT0.xy, v2.xy
+
+; Add in other angles based on the field
+mul LEFT, v1.y, c[CV_LEFT]
+mul DOWN, v1.z, c[CV_DOWN]
+
+; Set the final position
+add r4, v0, LEFT
+add r4, DOWN, r4
+
+; Transform position to clip space
+dp4 oPos.x, r4, c[CV_WORLDVIEWPROJ_0]
+dp4 oPos.y, r4, c[CV_WORLDVIEWPROJ_1]
+dp4 oPos.z, r4, c[CV_WORLDVIEWPROJ_2]
+dp4 oPos.w, r4, c[CV_WORLDVIEWPROJ_3]
+