The Color Vertex Shader

A slightly richer vertex shader that passes the color on to the fragment shader. 

134                 var vertexShaderSource   = "attribute vec3 position;"
135                                            + "attribute vec4 color;"
136                                            + ""
137                                            + "varying vec4 vColor;"
138                                            + ""
139                                            + "void main()"
140                                            + "{"
141                                            + "    gl_Position = vec4(position, 1);"
142                                            + "    vColor      = color;"
143                                            + "}";
(0,1) (-1,-1) (1,-1)
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Notes

The position attribute is again copied into gl_Position.

The new code defines a vec4 color attribute to hold r, g, b, α color values. The color attribute is assigned to the identically typed varying vColor. Varying variables are passed from the vertex shader to the fragment shader.