Then, you'll need to edit your x/y coordinate array to contain a Z coordinate (can be just 0). Using unsigned byte colors instead of float (rarely neccessary for colors) might also help to improve performance in this case, as then you only have 16 byte per vertex to send to the GPU (which is also very alignment friendly). 26.8k 21 115 149 asked at 10:27 MJB 65 13 Wow, where to begin I guess you should probably start by following an OpenGL-ES 2.0 tutorial so that you can render a triangle or something basic. I now have three ways to draw a circle: Generate vertices in a circle and use glDrawArray( GLLINES. Based on Drawing Shapes and this code found on, I can draw triangles and quares, but I still dont know how to draw a circle. Packing all the vertices into one array for drawing all segments with a single call (the first suggestion) would mean to repeat the colors for every line, but it might still be faster than doing multiple glDrawArrays calls, escpecially if you build the vertex and color arrays only once. Im new in OpenGL ES 2, and I have read many topics about how to draw a circle in OpenGL ES 2 on Android. In this case you cannot use a linestrip, of course. This way you only need numLines+1 vertices and can draw the linestrip with glDrawArray(GL_LINE_STRIP, 0, numLines+1) ĮDIT: And like Profet said, when all the line segments make up a single connected straight line, you can just use one single line with a 1D texture or a fragment shader (although that might be a bit heavy for a beginner) for varying the color along the line.ĮDIT: Your code suggests you want all the line segments to use the same start and end colors.

If the line segments are all connected, you can also use a linestrip, where the end vertex of a line is used as the start vertex of the next line (but keep in mind that in this case the end vertex of a line also has the same color as the start vertex of the next one, of course).

Just pack all the line's vertices (and colors of course) into one vertex array (and color array), so that vertex 2*i and vertex 2*i+1 make up line i and then draw all the lines in one go with glDrawArrays(GL_LINES, 0, 2*numLines) They are there to draw multiple primitives (lines in your case) in one draw call and you are only drawing one line each call.

Opengl es 2.0 draw line