DRW: DebugDraw: Port module to C++ and add GPU capabilities

This is a complete rewrite of the draw debug drawing module in C++.
It uses `GPUStorageBuf` to store the data to be drawn and use indirect
drawing. This makes it easier to do a mirror API for GPU shaders.

The C++ API class is exposed through `draw_debug.hh` and should be used
when possible in new code.

However, the debug drawing will not work for platform not yet supporting
`GPUStorageBuf`. Also keep in mind that this module must only be used
in debug build for performance and compatibility reasons.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_shader.cc b/source/blender/gpu/intern/gpu_shader.cc
index 8a630d9e3ca..08c768b28ba 100644
--- a/source/blender/gpu/intern/gpu_shader.cc
+++ b/source/blender/gpu/intern/gpu_shader.cc
@@ -578,6 +578,12 @@ int GPU_shader_get_builtin_block(GPUShader *shader, int builtin)
   return interface->ubo_builtin((GPUUniformBlockBuiltin)builtin);
 }
 
+int GPU_shader_get_builtin_ssbo(GPUShader *shader, int builtin)
+{
+  ShaderInterface *interface = unwrap(shader)->interface;
+  return interface->ssbo_builtin((GPUStorageBufferBuiltin)builtin);
+}
+
 int GPU_shader_get_ssbo(GPUShader *shader, const char *name)
 {
   ShaderInterface *interface = unwrap(shader)->interface;