Game Development Reference
Te s s e l l a t i o n
Figure 2.7. Programmable Vertex Pulling Rendering Pipeline.
a draw function is quite expensive on the CPU side, which originally decreased
the interest of the draw indirect functionality.
Fortunately, ARB_multi_draw_indirect ,aversionof AMD_multi_draw_indirect
promoted to the core specification in OpenGL 4.3, extends the draw indirect
functionality by packing multiple draw indirect calls into a single call, amor-
tising the high constant cost of the call [Rakos 12a]. With the new functions
glMultiDrawArraysIndi rect and glMultiDrawElementsIndirect the command pro-
cessor submits the draws in place of the CPU, thus removing nearly all CPU