scanline.cg

/* COMPATIBILITY 
   - HLSL compilers
   - Cg   compilers
*/

/*
   Author: Themaister
   License: Public domain
*/

struct sine_coord
{
   float2 omega;
};

struct input
{
   float2 video_size;
   float2 texture_size;
   float2 output_size;
   float  frame_count;
   float  frame_direction;
   float frame_rotation;
};

void main_vertex
(
   float4 position : POSITION,
   out float4 oPosition : POSITION,
   uniform float4x4 modelViewProj,

   float4 color : COLOR,
   out float4 oColor : COLOR,

   float2 tex : TEXCOORD,
   out float2 oTex : TEXCOORD,

   uniform input IN,
   out sine_coord coords : TEXCOORD2
)
{
   oPosition = mul(modelViewProj, position);
   oColor = color;
   oTex = tex;

   float2 texsize = IN.texture_size;
   float2 delta = 0.5 / texsize;
   float dx = delta.x;
   float dy = delta.y;

   coords.omega = float2(3.1415 * IN.output_size.x * IN.texture_size.x / IN.video_size.x, 2.0 * 3.1415 * IN.texture_size.y);
}

#pragma parameter SCANLINE_BASE_BRIGHTNESS "Scanline Base Brightness" 0.95 0.0 1.0 0.01
#pragma parameter SCANLINE_SINE_COMP_A "Scanline Sine Comp A" 0.05 0.0 0.10 0.01
#pragma parameter SCANLINE_SINE_COMP_B "Scanline Sine Comp B" 0.15 0.0 1.0 0.05

#ifdef PARAMETER_UNIFORM
uniform float SCANLINE_BASE_BRIGHTNESS;
uniform float SCANLINE_SINE_COMP_A;
uniform float SCANLINE_SINE_COMP_B;
#else
#define SCANLINE_BASE_BRIGHTNESS 0.95
#define SCANLINE_SINE_COMP_A 0.05
#define SCANLINE_SINE_COMP_B 0.15
#endif


float4 main_fragment (in sine_coord co : TEXCOORD2, float2 tex : TEXCOORD, uniform sampler2D s0 : TEXUNIT0) : COLOR
{
   
   float2 sine_comp = float2(SCANLINE_SINE_COMP_A, SCANLINE_SINE_COMP_B);
   float3 res = tex2D(s0, tex).xyz;
   float3 scanline = res * (SCANLINE_BASE_BRIGHTNESS + dot(sine_comp * sin(tex * co.omega), float2(1.0, 1.0)));
   return float4(scanline.x, scanline.y, scanline.z, 1.0);
}