| #version 450 | |
| #extension GL_ARB_separate_shader_objects : enable | |
| // Untransformed vertex positions in clockwise order, starting | |
| // at the top left corner. These form a triangle that fully | |
| // covers the screen in clip space. | |
| vec2 positions[3] = vec2[]( | |
| vec2(-1,-1), | |
| vec2(3,-1), | |
| vec2(-1,3) | |
| ); | |
| // Use gl_VertexIndex to index into the hardcoded rectangle | |
| // positions array. | |
| void main() { | |
| vec2 pos = positions[gl_VertexIndex]; | |
| gl_Position = vec4(pos, 0, 1.0); | |
| } | |