source: data/trunk/shaders/mapped_water.vert @ 3824

varying vec4 refrCoords; 
varying vec4 normCoords; 
varying vec4 viewCoords;
varying vec4 viewTangetSpace;
varying vec4 lightTangetSpace;

uniform vec4 lightPos, cameraPos;


void main()
{
        // Because we have a flat plane for water we already know the vectors for tangent space
        vec4 tangent = vec4(1.0, 0.0, 0.0, 0.0);
        vec4 normal = vec4(0.0, 1.0, 0.0, 0.0);
        vec4 biTangent = vec4(0.0, 0.0, 1.0, 0.0);

        // Calculate the vector coming from the vertex to the camera
        vec4 viewDir = cameraPos - gl_Vertex;

        // Compute tangent space for the view direction
        viewTangetSpace.x = dot(viewDir, tangent);
        viewTangetSpace.y = dot(viewDir, biTangent);
        viewTangetSpace.z = dot(viewDir, normal);
        viewTangetSpace.w = 1.0;

        // Calculate the vector that the light hits the vertex
        vec4 lightDir = lightPos - gl_Vertex;

        // Compute tangent space for the light direction
        lightTangetSpace.x = dot(lightDir, tangent);
        lightTangetSpace.y = dot(lightDir, biTangent);
        lightTangetSpace.z = dot(lightDir, normal);
        lightTangetSpace.w = 1.0;

        refrCoords = gl_MultiTexCoord1;
        normCoords = gl_MultiTexCoord2;

        // This calculates our current projection coordinates
        viewCoords = gl_ModelViewProjectionMatrix * gl_Vertex;

        gl_Position = viewCoords;
}