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// Vertex shader special variables.
highp   vec4  gl_Position;
mediump float gl_PointSize;

// Texture level-of-detail functions.
vec4 texture2DLod(sampler2D sampler, vec2 coord, float lod);
vec4 texture2DProjLod(sampler2D sampler, vec3 coord, float lod);
vec4 texture2DProjLod(sampler2D sampler, vec4 coord, float lod);
vec4 textureCubeLod(samplerCube sampler, vec3 coord, float lod);