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imgui/examples/apple_example/imguiex-ios/Shaders/Shader.vsh

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//
// Shader.vsh
// imguiex
attribute vec4 position;
attribute vec3 normal;
varying lowp vec4 colorVarying;
uniform vec3 diffuseColor;
uniform mat4 modelViewProjectionMatrix;
uniform mat3 normalMatrix;
void main()
{
vec3 eyeNormal = normalize(normalMatrix * normal);
vec3 lightPosition = vec3(0.0, 0.0, 1.0);
float nDotVP = max(0.0, dot(eyeNormal, normalize(lightPosition)));
vec3 colorLit = diffuseColor * nDotVP;
colorVarying = vec4( colorLit.x, colorLit.y, colorLit.z, 1.0 );
gl_Position = modelViewProjectionMatrix * position;
}