//-------------------------------
//BlurH.glsl
// Horizontal Gaussian-Blur pass
//-------------------------------

#ifdef GL_ES
precision mediump int;
precision mediump float;
#endif

#define USE_OGRE_FROM_FUTURE
#include <OgreUnifiedShader.h>

SAMPLER2D(Blur0, 0);

MAIN_PARAMETERS
IN(vec2 oUv0, TEXCOORD0)
MAIN_DECLARATION
{
  vec2 pos[11];
  //We use the Normal-gauss distribution formula
  //f(x) being the formula, we used f(0.5)-f(-0.5); f(1.5)-f(0.5)...
  float samples[11];

	pos[0] = vec2(-5.0, 0.0);
	pos[1] = vec2(-4.0, 0.0);
	pos[2] = vec2(-3.0, 0.0);
	pos[3] = vec2(-2.0, 0.0);
	pos[4] = vec2(-1.0, 0.0);
	pos[5] = vec2(0.0, 0.0);
	pos[6] = vec2(1.0, 0.0);
	pos[7] = vec2(2.0, 0.0);
	pos[8] = vec2(3.0, 0.0);
	pos[9] = vec2(4.0, 0.0);
	pos[10] = vec2(5.0, 0.0);

	//We use the Normal-gauss distribution formula
	//f(x) being the formula, we used f(0.5)-f(-0.5); f(1.5)-f(0.5)...
	//stddev=2.0
	samples[0] = 0.01222447;
	samples[1] = 0.02783468;
	samples[2] = 0.06559061;
	samples[3] = 0.12097757;
	samples[4] = 0.17466632;
	samples[5] = 0.19741265;
	samples[6] = 0.17466632;
	samples[7] = 0.12097757;
	samples[8] = 0.06559061;
	samples[9] = 0.02783468;
	samples[10] = 0.01222447;
	
  vec4 sum = vec4_splat(0.0);
  int i = 0;
  
  for( i=0;i < 11; i++ )
  {
    sum += texture2D(Blur0, oUv0 + (pos[i] * vec2_splat(0.0100000))) * vec4_splat(samples[i]);
  }

  gl_FragColor = sum;
}