// Shader based on work by Fabien Sanglard // Released under the terms of CC-BY 3.0 #version 130 uniform float speed; uniform float height; uniform float waveLength; uniform vec3 lightdir; noperspective out vec3 lightVec; noperspective out vec3 halfVec; noperspective out vec3 eyeVec; out vec2 uv; void main() { vec4 pos = gl_Vertex; pos.y += (sin(pos.x/waveLength + speed) + cos(pos.z/waveLength + speed)) * height; vec3 vertexPosition = vec3(gl_ModelViewMatrix * pos); // Building the matrix Eye Space -> Tangent Space vec3 n = normalize (gl_NormalMatrix * gl_Normal); // gl_MultiTexCoord1.xyz vec3 t = normalize (gl_NormalMatrix * vec3(1.0, 0.0, 0.0)); // tangent vec3 b = cross (n, t); // transform light and half angle vectors by tangent basis vec3 v; v.x = dot (lightdir, t); v.y = dot (lightdir, b); v.z = dot (lightdir, n); lightVec = normalize (v); vertexPosition = normalize(vertexPosition); eyeVec = normalize(-vertexPosition); // we are in Eye Coordinates, so EyePos is (0,0,0) // Normalize the halfVector to pass it to the fragment shader // No need to divide by two, the result is normalized anyway. // vec3 halfVector = normalize((vertexPosition + lightDir) / 2.0); vec3 halfVector = normalize(vertexPosition + lightdir); v.x = dot (halfVector, t); v.y = dot (halfVector, b); v.z = dot (halfVector, n); // No need to normalize, t,b,n and halfVector are normal vectors. //normalize (v); halfVec = v ; gl_Position = gl_ModelViewProjectionMatrix * pos; uv = (gl_TextureMatrix[0] * gl_MultiTexCoord0).st; }