Based on above problem (Computer Graphics Programming in OpenGL with Java):

1. How to modify program 2.5 so that it draws a rectangle (rather than the right triangle)?

2. How to modify program from no. 1 so that it draws a rectangle with 4 different colors depending on the x and y coordinates of the pixel?

Program 2.5 Drawing a Triangle Vertex Shader \#version 430 void main(void) \{ if (gl_VertexID = 0 ) gl_Position = vec4 (0.25,0.25,0.0,1.0); else if (9I_VertexID ==1) gl_Position = vec4 (0.25,0.25,0.0,1.0); else gl_Position = vec4 (0.25,0.25,0.0,1.0); \} Java/JOGL application - in display() gl.gIDrawArrays(GL_TRIANGLES, 0, 3)