These reduce the number of vertices you need to pass if you. now, i try to make a line with opengl es 2.0 while user is moving their finger. There are some additional drawing modes to choose from, like triangle strips and line strips. when you touch two times, it will draw one line. To use this, you call (in ES 3.0): glEnable (GLPRIMITIVERESTARTFIXEDINDEX) and then use the highest possible index for the index format (e.g. 1 I've downloaded and run the opengl sample from android. draw a line and circle in opengl es 2.0 in android using touch event in surfaceview. GLfloat colorToSet = // Set whatever color, this should output red. In higher versions of OpenGL (ES 3.0, or any recent version of full OpenGL), you would have a few options: Primitive restart. OpenGL for Embedded Systems (OpenGL ES or GLES) is a subset of the OpenGL computer graphics rendering application programming interface (API) for rendering. You need to use the current program, find the uniform location and pass the value you want to set as a color: GLuint myShaderProgram // Your program ID you got when creating the program. Now this means you can control the uniformColor from the CPU using openGL API. The minimum requirements are Android 8 (64-bit) and OpenGL ES 3. To change it something you can modify you will need to add the uniform so your shader will look something like this: uniform lowp vec4 uniformColor Citra is very straightforward because it has the basic tools of any. So to see where the shader color output is: gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) // Will output white color (RGBA values) The short version of solution would be to add the uniform into your fragment shader that represents the color and then output the color in the fragment shader.

You provided very little information about what you are using.

Opengl es 2.0 draw line