source: data/data_extern/programs/GLSL120/HWBasicInstancing.vert

//---------------------------------------------------------------------------
//These materials/shaders are part of the NEW InstanceManager implementation
//Written by Matias N. Goldberg ("dark_sylinc")
//---------------------------------------------------------------------------
#version 120

//Vertex input
attribute vec4 vertex;
attribute vec3 normal;
attribute vec4 uv0;
attribute vec4 uv1;
attribute vec4 uv2;
attribute vec4 uv3;
attribute vec3 tangent;

//Parameters
uniform mat4 viewProjMatrix;

#if (DEPTH_SHADOWCASTER || DEPTH_SHADOWRECEIVER)
uniform vec4 depthRange;
#endif

#if DEPTH_SHADOWRECEIVER
uniform mat4 texViewProjMatrix;
#endif

//Output
#if DEPTH_SHADOWCASTER
        varying vec2 depth;
#else
        varying vec2 _uv0;
        varying vec3 oNormal;
        varying vec3 oVPos;
        #if DEPTH_SHADOWRECEIVER
                varying vec4 oLightSpacePos;
        #endif
#endif

//---------------------------------------------
//Main Vertex Shader
//---------------------------------------------
void main(void)
{
        mat4 worldMatrix;
        worldMatrix[0] = uv1;
        worldMatrix[1] = uv2;
        worldMatrix[2] = uv3;
        worldMatrix[3] = vec4( 0, 0, 0, 1 );

        vec4 worldPos           = vertex * worldMatrix;
        vec3 worldNorm          = normal * mat3(worldMatrix);

        //Transform the position
        gl_Position                     = viewProjMatrix * worldPos;
        
#if DEPTH_SHADOWCASTER
        depth.x                         = (gl_Position.z - depthRange.x) * depthRange.w;
        depth.y                         = depthRange.w;
#else
        _uv0            = uv0.xy;
        oNormal         = worldNorm;
        oVPos           = worldPos.xyz;

        #if DEPTH_SHADOWRECEIVER
                oLightSpacePos          = texViewProjMatrix * worldPos;
                oLightSpacePos.z        = (oLightSpacePos.z - depthRange.x) * depthRange.w;
        #endif
#endif
}