1; Copyright (c) 2015 Yuri Kunde Schlesner
2; Copyright (c) 2016 Jeffrey Pfau
3;
4; This Source Code Form is subject to the terms of the Mozilla Public
5; License, v. 2.0. If a copy of the MPL was not distributed with this
6; file, You can obtain one at http://mozilla.org/MPL/2.0/.
7
8; Inputs
9.alias in_pos v0 ; [x, y, w, h]
10.alias in_tc0 v1 ; [u, v, uw, vh]
11.alias in_col v2
12.alias in_rot v3
13
14.gsh point c0
15
16; Uniforms
17.fvec projectionMtx[4]
18.fvec textureMtx[2]
19
20; Constants
21.constf consts1(0.0, 1.0, -0.5, -1.0)
22
23; Outputs
24.out out_pos position
25.out out_tc0 texcoord0
26.out out_col color
27
28.entry gshMain
29.proc gshMain
30	; Set up the vertex endpoints
31	mov r0.xy, in_pos.zw
32	mov r0.zw, consts1.xx
33	mov r4.xy, in_pos.xy
34	add r5, r4.xyzw, r0.xwww
35	add r6, r4.xyzw, r0.xyww
36	add r7, r4.xyzw, r0.wyww
37
38	; Create rotation matrix
39	mov r8, in_rot.xzww
40	mov r9, in_rot.yxww
41	mov r10.zw, consts1.zy
42
43	; Transform coordinates
44	dp4 r10.x, r8, r4
45	dp4 r10.y, r9, r4
46	dp4 r0.x, projectionMtx[0], r10
47	dp4 r0.y, projectionMtx[1], r10
48	dp4 r0.z, projectionMtx[2], r10
49	dp4 r0.w, projectionMtx[3], r10
50
51	dp4 r10.x, r8, r5
52	dp4 r10.y, r9, r5
53	dp4 r1.x, projectionMtx[0], r10
54	dp4 r1.y, projectionMtx[1], r10
55	dp4 r1.z, projectionMtx[2], r10
56	dp4 r1.w, projectionMtx[3], r10
57
58	dp4 r10.x, r8, r6
59	dp4 r10.y, r9, r6
60	dp4 r2.x, projectionMtx[0], r10
61	dp4 r2.y, projectionMtx[1], r10
62	dp4 r2.z, projectionMtx[2], r10
63	dp4 r2.w, projectionMtx[3], r10
64
65	dp4 r10.x, r8, r7
66	dp4 r10.y, r9, r7
67	dp4 r3.x, projectionMtx[0], r10
68	dp4 r3.y, projectionMtx[1], r10
69	dp4 r3.z, projectionMtx[2], r10
70	dp4 r3.w, projectionMtx[3], r10
71
72	; Set up the texture endpoints
73	mov r6.xy, in_tc0.xy
74	add r7.xy, r6.xy, in_tc0.zw
75
76	dp4 r4.x, textureMtx[0], r6
77	dp4 r4.y, textureMtx[1], r6
78	mov r4.zw, consts1.xy
79
80	dp4 r5.x, textureMtx[0], r7
81	dp4 r5.y, textureMtx[1], r7
82	mov r5.zw, consts1.xy
83
84	; Emit top-left
85	setemit 0
86	mov out_pos, r0
87	mov out_tc0.xyzw, r4.xyzw
88	mov out_col, in_col
89	emit
90
91	; Emit bottom-left
92	setemit 1
93	mov out_pos, r1
94	mov out_tc0.x, r5.x
95	mov out_tc0.y, r4.y
96	mov out_tc0.z, consts1.x
97	mov out_tc0.w, consts1.y
98	mov out_col, in_col
99	emit
100
101	; Emit bottom-right
102	setemit 2, prim
103	mov out_pos, r2
104	mov out_tc0.xyzw, r5.xyzw
105	mov out_col, in_col
106	emit
107
108	; Emit top-right
109	setemit 1, prim inv
110	mov out_pos, r3
111	mov out_tc0.x, r4.x
112	mov out_tc0.y, r5.y
113	mov out_tc0.z, consts1.x
114	mov out_tc0.w, consts1.y
115	mov out_col, in_col
116	emit
117
118	end
119.end
120