1. OpenGL Programmable Pipeline

• Vertex Shading Stage

  • vertex buffer data is processed on per-vertex basis

  • we must provide a vertex shader and have it bound by glUseProgram(shader_program_ID)

• Tesselation Stage

  • optional: additional per-vertex processing

• Geometry Shading Stage

  • optional: additional work with geometry (triangles, lines, points)

• Rasterization (not programmable)

  • Uncolored fragments (pixel candidates) are generated

• Fragment Shading Stage

  • per-fragment (pixel) processing: colors assigned, depth values computed

  • we must provide a fragment shader and have it bound by glUseProgram(shader_program_ID)

• Compute Shading Stage

  • another chance to access buffers already generated

  • general purpose processing