// Note, this won't work on ATI which is why it's not used
// the issue is with the array initializers
// no card supports GL_3DL_array_objects but it does work on nvidia, not on ATI
//#extension GL_3DL_array_objects : enable

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

	//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;
}