GPUMaterial: Add Material shader cache.

This is mostly to avoid re-compilation when using undo/redo operators.
This also has the benefit to reuse the same GPUShader for multiple materials using the same nodetree configuration.

The cache stores GPUPasses that already contains the shader code and a hash to test for matches.
We use refcounts to know when a GPUPass is not used anymore.

I had to move the GPUInput list from GPUPass to GPUMaterial because it's containing references to the material nodetree and cannot be reused.

A garbage collection is hardcoded to run every 60 seconds to free every unused GPUPass.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_material.h b/source/blender/gpu/GPU_material.h
index 6df465ac753..1d2b234e7f3 100644
--- a/source/blender/gpu/GPU_material.h
+++ b/source/blender/gpu/GPU_material.h
@@ -270,6 +270,7 @@ bool GPU_material_bound(GPUMaterial *material);
 struct Scene *GPU_material_scene(GPUMaterial *material);
 GPUMatType GPU_Material_get_type(GPUMaterial *material);
 struct GPUPass *GPU_material_get_pass(GPUMaterial *material);
+struct ListBase *GPU_material_get_inputs(GPUMaterial *material);
 GPUMaterialStatus GPU_material_status(GPUMaterial *mat);
 
 struct GPUUniformBuffer *GPU_material_get_uniform_buffer(GPUMaterial *material);
@@ -377,6 +378,9 @@ void GPU_material_update_fvar_offset(GPUMaterial *gpu_material,
                                      struct DerivedMesh *dm);
 #endif
 
+void GPU_pass_cache_garbage_collect(void);
+void GPU_pass_cache_free(void);
+
 #ifdef __cplusplus
 }
 #endif