#version 120 #extension GL_EXT_geometry_shader4 : enable uniform vec4 origColor; uniform vec4 cloneColor; void main(void) { //increment variable int i; ///////////////////////////////////////////////////////////// //This example has two parts // step a) draw the primitive pushed down the pipeline // there are gl_Vertices # of vertices // put the vertex value into gl_Position // use EmitVertex => 'create' a new vertex // use EndPrimitive to signal that you are done creating a primitive! // step b) create a new piece of geometry (I.E. WHY WE ARE USING A GEOMETRY SHADER!) // I just do the same loop, but swizzle the x and y values // result => the line we want to draw, and the same line, but along the other axis //Pass-thru! for(i=0; i< gl_VerticesIn; i++){ gl_Position = gl_PositionIn[i]; gl_FrontColor = origColor; EmitVertex(); } EndPrimitive(); //New piece of geometry! We just swizzle the x and y terms for(i=0; i< gl_VerticesIn; i++){ gl_Position = gl_PositionIn[i]; gl_Position.xy = gl_Position.yx; gl_FrontColor = cloneColor; EmitVertex(); } EndPrimitive(); } #version 120 #extension GL_EXT_geometry_shader4 : enable uniform vec4 origColor; uniform vec4 cloneColor; void main(void) { //increment variable int i; ///////////////////////////////////////////////////////////// //This example has two parts // step a) draw the primitive pushed down the pipeline // there are gl_Vertices # of vertices // put the vertex value into gl_Position // use EmitVertex => 'create' a new vertex // use EndPrimitive to signal that you are done creating a primitive! // step b) create a new piece of geometry (I.E. WHY WE ARE USING A GEOMETRY SHADER!) // I just do the same loop, but swizzle the x and y values // result => the line we want to draw, and the same line, but along the other axis //Pass-thru! for(i=0; i< gl_VerticesIn; i++){ gl_Position = gl_PositionIn[i]; gl_FrontColor = origColor; EmitVertex(); } EndPrimitive(); //New piece of geometry! We just swizzle the x and y terms for(i=0; i< gl_VerticesIn; i++){ gl_Position = gl_PositionIn[i]; gl_Position.xy = gl_Position.yx; gl_FrontColor = cloneColor; EmitVertex(); } EndPrimitive(); }