input-lag.cg

/*
    Input Lag shader
*/

struct previous
{
   uniform sampler2D texture;
   float2 tex_coord;
};

struct input
{
    float2 video_size;
    float2 texture_size;
    float2 output_size;
    float frame_count;
    float frame_direction;
    float frame_rotation;
    sampler2D texture : TEXUNIT0;
};

struct tex_coords
{
   float2 tex;
   float2 prev;
   float2 prev1;
   float2 prev2;
   float2 prev3;
   float2 prev4;
   float2 prev5;
   float2 prev6;
};

void main_vertex
(
   float4 position : POSITION,
   out float4 oPosition : POSITION,
   uniform float4x4 modelViewProj,
   float2 tex : TEXCOORD,

   previous PREV,
   previous PREV1,
   previous PREV2,
   previous PREV3,
   previous PREV4,
   previous PREV5,
   previous PREV6,
   out tex_coords coords
)
{
   oPosition = mul(modelViewProj, position);
   coords = tex_coords(tex, PREV.tex_coord,
      PREV1.tex_coord,
      PREV2.tex_coord,
      PREV3.tex_coord,
      PREV4.tex_coord,
      PREV5.tex_coord,
      PREV6.tex_coord);
}

struct output 
{
  float4 col    : COLOR;
};

output main_fragment(tex_coords coords,
uniform input IN,
      previous PREV,
      previous PREV1,
      previous PREV2,
      previous PREV3,
      previous PREV4,
      previous PREV5,
      previous PREV6
)
{
   float4 color = tex2D(PREV6.texture, coords.prev6); // Add 7 frames of input lag by displaying the seventh previous frame (PREV6)

   output OUT;
   OUT.col = color;
   return OUT;
}