1/*
2Copyright (C) 2010 Rhys J. Perkins
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; if not, write to the Free Software
16Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17*/
18
19//
20// 2D Scale Effect File
21//
22// Point Sampling
23//
24
25#define LINES_ON      1.0
26#define LINES_OFF     1.0
27#define OFF_INTENSITY 0.5
28
29#include "Scaling.inc"
30
31// The name of this effect
32string name : NAME = "Point Sampling";
33float scaling : SCALING = 2.0;
34
35//
36// Techniques
37//
38
39// combineTechnique: Final combine steps. Outputs to destination frame buffer
40string combineTechique : COMBINETECHNIQUE = "Point";
41
42//
43// Vertex Shader Output
44//
45
46struct VS_OUTPUT
47{
48	float4 Position		: POSITION;
49	float2 UV		: TEXCOORD0;
50};
51
52
53//
54// Vertex Shader
55//
56
57VS_OUTPUT VS(float3 Position : POSITION, float2 TexCoord : TEXCOORD0)
58{
59	VS_OUTPUT Out =	(VS_OUTPUT)0;
60

61	Out.Position = mul(float4(Position, 1), WorldViewProjection);   // Matrix multipliy
62	Out.UV = TexCoord;
63
64	return Out;
65}
66
67
68//
69// Pixel Shader
70//
71
72float4 PS (in VS_OUTPUT input) : COLOR
73{
74	// Adjust pixelRatio in multiples of 0.9 (derived from 16:9 / 16:10 ratio)
75	// This will adjust the thickness of the scanlines
76	float pixelRatio = 2.7; //1.8; //0.9;
77		
78	float intensity = (input.UV.y * SourceDims.y * pixelRatio) % (LINES_ON + LINES_OFF);
79	intensity = intensity < LINES_ON ? 1.0 : OFF_INTENSITY;
80
81	return tex2D(SourceSampler, input.UV) * intensity;
82}
83
84
85//
86// Technique
87//
88
89technique Point
90{
91    pass P0
92    {
93        // shaders
94        VertexShader = compile vs_2_0 VS();
95        PixelShader  = compile ps_2_0 PS();
96	AlphaBlendEnable = FALSE;
97	ColorWriteEnable = RED|GREEN|BLUE|ALPHA;
98	SRGBWRITEENABLE = FALSE;
99    }  
100}