1 files changed, 84 insertions, 0 deletions
diff --git a/src/brussel.engine/VertexIndex.cpp b/src/brussel.engine/VertexIndex.cpp
new file mode 100644
index 0000000..ac68289
--- /dev/null
+++ b/src/brussel.engine/VertexIndex.cpp
@@ -0,0 +1,84 @@
+#include "VertexIndex.hpp"
+
+#include <algorithm>
+
+GpuVertexBuffer::GpuVertexBuffer() {
+	glGenBuffers(1, &handle);
+}
+
+GpuVertexBuffer::~GpuVertexBuffer() {
+	glDeleteBuffers(1, &handle);
+}
+
+void GpuVertexBuffer::Upload(const std::byte* data, size_t sizeInBytes) {
+	glBindBuffer(GL_ARRAY_BUFFER, handle);
+	glBufferData(GL_ARRAY_BUFFER, sizeInBytes, data, GL_DYNAMIC_DRAW);
+}
+
+GpuIndexBuffer::GpuIndexBuffer() {
+	glGenBuffers(1, &handle);
+}
+
+GpuIndexBuffer::~GpuIndexBuffer() {
+	glDeleteBuffers(1, &handle);
+}
+
+void GpuIndexBuffer::Upload(const std::byte* data, Tags::IndexType type, size_t count) {
+	this->indexType = type;
+	this->count = count;
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * Tags::SizeOf(type), data, GL_DYNAMIC_DRAW);
+}
+
+int BufferBindings::GetMaxBindingIndex() const {
+	return bindings.size() - 1;
+}
+
+GpuVertexBuffer* BufferBindings::GetBinding(int index) const {
+	if (index >= 0 && index < bindings.size()) {
+		return bindings[index].Get();
+	} else {
+		return nullptr;
+	}
+}
+
+void BufferBindings::SetBinding(int index, GpuVertexBuffer* buffer) {
+	int maxBindingIndex = GetMaxBindingIndex();
+	if (index > maxBindingIndex) {
+		int countDelta = index - maxBindingIndex;
+		bindings.resize(bindings.size() + countDelta);
+	}
+
+	bindings[index].Attach(buffer);
+	if (index == maxBindingIndex && buffer == nullptr) {
+		bindings.pop_back();
+	}
+}
+
+void BufferBindings::Clear() {
+	bindings.clear();
+}
+
+int VertexElementFormat::GetStride() const {
+	return Tags::SizeOf(type);
+}
+
+void VertexFormat::AddElement(VertexElementFormat element) {
+	vertexSize += element.GetStride();
+
+	int lastIdx = (int)elements.size() - 1;
+	if (lastIdx >= 0) {
+		auto& last = elements[lastIdx];
+		element.offset = last.offset + last.GetStride();
+	} else {
+		element.offset = 0;
+	}
+
+	elements.push_back(std::move(element));
+}
+
+void VertexFormat::RemoveElement(int index) {
+	auto& element = elements[index];
+	vertexSize -= element.GetStride();
+	elements.erase(elements.begin() + index);
+}