UBO consolidation (#3089)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/mbgl/mtl/uniform_buffer.cpp

@@ -1,6 +1,7 @@
 #include <mbgl/mtl/uniform_buffer.hpp>
-
+#include <mbgl/mtl/render_pass.hpp>
 #include <mbgl/mtl/context.hpp>
+#include <mbgl/shaders/layer_ubo.hpp>
 #include <mbgl/util/logging.hpp>
 
 #include <cassert>
@@ -24,18 +25,33 @@ UniformBuffer::~UniformBuffer() {
     buffer.getContext().renderingStats().memUniformBuffers -= size;
 }
 
-void UniformBuffer::update(const void* data, std::size_t size_) {
-    assert(size == size_);
-    if (size != size_ || size != buffer.getSizeInBytes()) {
-        Log::Error(
-            Event::General,
-            "Mismatched size given to UBO update, expected " + std::to_string(size) + ", got " + std::to_string(size_));
+void UniformBuffer::update(const void* data, std::size_t dataSize) {
+    assert(dataSize <= size);
+    if (dataSize > size || dataSize > buffer.getSizeInBytes()) {
+        Log::Error(Event::General,
+                   "Mismatched size given to UBO update, expected max " + std::to_string(size) + ", got " +
+                       std::to_string(dataSize));
         return;
     }
 
     buffer.getContext().renderingStats().numUniformUpdates++;
-    buffer.getContext().renderingStats().uniformUpdateBytes += size_;
-    buffer.update(data, size, /*offset=*/0);
+    buffer.getContext().renderingStats().uniformUpdateBytes += dataSize;
+    buffer.update(data, dataSize, /*offset=*/0);
+}
+
+void UniformBufferArray::bind(RenderPass& renderPass) const noexcept {
+    for (size_t id = 0; id < allocatedSize(); id++) {
+        const auto& uniformBuffer = get(id);
+        if (!uniformBuffer) continue;
+        const auto& buffer = static_cast<UniformBuffer&>(*uniformBuffer.get());
+        const auto& resource = buffer.getBufferResource();
+        if (id != shaders::idDrawableReservedFragmentOnlyUBO) {
+            renderPass.bindVertex(resource, 0, id);
+        }
+        if (id != shaders::idDrawableReservedVertexOnlyUBO) {
+            renderPass.bindFragment(resource, 0, id);
+        }
+    }
 }
 
 } // namespace mtl