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GPU: Refactor API for Clearing Storage Buffers

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The previous API for clearing storage buffers was following the OpenGL
api. OpenGL has many options to support for data conversions, striding
and sizzling. Metal and Vulkan don't have these features and we have to
deal it ourselves.

Blender internally only uses a tiny subset for what is possible in
OpenGL. Making the current API to difficult to implement on our future
platforms as we had to implement all cases, most even not used at all.

By changing the API we make future development easier as we only need
to implement what we are actually using.

**New API**

`GPU_storagebuf_clear(GPUStorageBuf* ssbo, uint32_t clear_value)`

Related issue: #105492

Pull Request: blender/blender#105521
This commit is contained in:
Jeroen Bakker
2023-03-09 18:46:28 +01:00
committed by Clément Foucault
parent ffcd8e6b02
commit af5a115f65
10 changed files with 29 additions and 41 deletions
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15
source/blender/gpu/opengl/gl_storage_buffer.cc
View File

@@ -117,27 +117,20 @@ void GLStorageBuf::unbind()
slot_ = 0;
}
void GLStorageBuf::clear(eGPUTextureFormat internal_format, eGPUDataFormat data_format, void *data)
void GLStorageBuf::clear(uint32_t clear_value)
{
if (ssbo_id_ == 0) {
this->init();
}
if (GLContext::direct_state_access_support) {
glClearNamedBufferData(ssbo_id_,
to_gl_internal_format(internal_format),
to_gl_data_format(internal_format),
to_gl(data_format),
data);
glClearNamedBufferData(ssbo_id_, GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, &clear_value);
}
else {
/* WATCH(@fclem): This should be ok since we only use clear outside of drawing functions. */
glBindBuffer(GL_SHADER_STORAGE_BUFFER, ssbo_id_);
glClearBufferData(GL_SHADER_STORAGE_BUFFER,
to_gl_internal_format(internal_format),
to_gl_data_format(internal_format),
to_gl(data_format),
data);
glClearBufferData(
GL_SHADER_STORAGE_BUFFER, GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, &clear_value);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
}
}