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

#define USE_OGRE_FROM_FUTURE
#include <OgreUnifiedShader.h>

OGRE_UNIFORMS(
uniform mat4 worldViewProjMatrix;
uniform mat4 worldMat;
uniform mat4 witMat;
uniform mat4 texMatrix0;
uniform mat4 texMat;
)

MAIN_PARAMETERS
IN(vec4 vertex, POSITION)
IN(vec4 normal, NORMAL)
IN(vec2 uv0, TEXCOORD0)
OUT(vec3 oUv, TEXCOORD0)
OUT(vec3 oShadowLightspacePos, TEXCOORD1)
OUT(vec3 oWp, TEXCOORD2)
OUT(vec3 oNormal, TEXCOORD3)
MAIN_DECLARATION
{
  // calculate output position
  vec4 oPos = mul(worldViewProjMatrix, vertex);
  vec4 wp = mul(worldMat, vertex);
  oNormal = normalize(mul(witMat, normal).xyz);
  
  // Calculate vertex position in light space
  oShadowLightspacePos = mul(texMatrix0, wp).xyz;
  oUv.xy = mul(texMat, vec4(uv0.x, uv0.y, 0.0, 1.0)).xy;
  
  // Store vertex distance from camera for use in shadows
  oUv.z = oPos.z;

  oWp = wp.xyz;
  gl_Position = oPos;
}