GPU: Compute Pipeline.

With the compute pipeline calculation can be offloaded to the GPU.
This patch only adds the framework for compute. So no changes for users at
this moment.

NOTE: As this is an OpenGL4.3 feature it must always have a fallback.

Use `GPU_compute_shader_support` to check if compute pipeline can be used.
Check `gpu_shader_compute*` test cases for usage.

This patch also adds support for shader storage buffer objects and device only
vertex/index buffers.

An alternative that had been discussed was adding this to the `GPUBatch`, this
was eventually not chosen as it would lead to more code when used as part of a
shading group. The idea is that we add an `eDRWCommandType` in the near
future.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D10913

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt
index f1ffd7827b8..cf6009c2881 100644
--- a/source/blender/gpu/CMakeLists.txt
+++ b/source/blender/gpu/CMakeLists.txt
@@ -62,6 +62,7 @@ set(SRC
   intern/gpu_buffers.c
   intern/gpu_capabilities.cc
   intern/gpu_codegen.c
+  intern/gpu_compute.cc
   intern/gpu_context.cc
   intern/gpu_debug.cc
   intern/gpu_drawlist.cc
@@ -91,6 +92,7 @@ set(SRC
 
   opengl/gl_backend.cc
   opengl/gl_batch.cc
+  opengl/gl_compute.cc
   opengl/gl_context.cc
   opengl/gl_debug.cc
   opengl/gl_debug_layer.cc
@@ -113,6 +115,7 @@ set(SRC
   GPU_buffers.h
   GPU_capabilities.h
   GPU_common.h
+  GPU_compute.h
   GPU_context.h
   GPU_debug.h
   GPU_drawlist.h
@@ -163,6 +166,7 @@ set(SRC
 
   opengl/gl_backend.hh
   opengl/gl_batch.hh
+  opengl/gl_compute.hh
   opengl/gl_context.hh
   opengl/gl_debug.hh
   opengl/gl_drawlist.hh
@@ -390,6 +394,7 @@ if(WITH_GTESTS)
   if(WITH_OPENGL_DRAW_TESTS)
     set(TEST_SRC
       tests/gpu_testing.cc
+      tests/gpu_shader_test.cc
 
       tests/gpu_testing.hh
     )