RetroArch/hqflt/cg/quad.cg

/*
   Author: Themaister
   License: Public domain
*/

/* Default Vertex shader */
void main_vertex
(
 float4 position	: POSITION,
 float4 color	: COLOR,
 float2 texCoord : TEXCOORD0,

 uniform float4x4 modelViewProj,

 out float4 oPosition : POSITION,
 out float4 oColor    : COLOR,
 out float2 otexCoord : TEXCOORD
 )
{
   oPosition = mul(modelViewProj, position);
   oColor = color;
   otexCoord = texCoord;
}

struct output
{
   float4 color : COLOR;
};

struct input
{
  float2 video_size;
  float2 texture_size;
  float2 output_size;
};

struct deltas
{
   float2 UL, UR, DL, DR;
};

float3 quad_inter(float3 x0, float3 x1, float3 x2, float x)
{
   float3 poly[3];
   poly[2] = 0.5*x0 - x1 + 0.5*x2;
   poly[1] = -1.5*x0 + 2.0*x1 - 0.5*x2;
   poly[0] = x0;
   return poly[2] * x * x + poly[1] * x + poly[0];
}

output main_fragment (float2 tex : TEXCOORD0, uniform input IN, uniform sampler2D s0 : TEXUNIT0)
{
   float2 texsize = IN.texture_size;
   float dx = float(pow(1.0 * texsize.x, -1.0));
   float dy = float(pow(1.0 * texsize.y, -1.0));

   float3 c01 = tex2D(s0, tex + float2(-dx, 0)).xyz;
   float3 c10 = tex2D(s0, tex + float2(0, -dy)).xyz;
   float3 c11 = tex2D(s0, tex + float2(0, 0)).xyz;
   float3 c12 = tex2D(s0, tex + float2(0, dy)).xyz;
   float3 c21 = tex2D(s0, tex + float2(dx, 0)).xyz;

   float blur = 1.5;
   float3 xval0 = quad_inter(c01, c11, c21, blur*(frac(tex.x * texsize.x)) + (2.0 - blur) * 0.5);
   float3 yval0 = quad_inter(c10, c11, c12, blur*(frac(tex.y * texsize.y)) + (2.0 - blur) * 0.5);

   output OUT;
   OUT.color = float4(lerp(xval0, yval0, 0.5), 1.0);
   return OUT;
}