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#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);
}
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