Common: Move GL classes to subdirectory

src/common/gl/stream_buffer.cpp

@@ -0,0 +1,58 @@
+#include "stream_buffer.h"
+
+namespace GL {
+
+StreamBuffer::StreamBuffer(GLenum target, GLuint buffer_id, u32 size)
+  : m_target(target), m_buffer_id(buffer_id), m_size(size), m_cpu_buffer(size)
+{
+}
+
+StreamBuffer::~StreamBuffer()
+{
+  glDeleteBuffers(1, &m_buffer_id);
+}
+
+void StreamBuffer::Bind()
+{
+  glBindBuffer(m_target, m_buffer_id);
+}
+
+void StreamBuffer::Unbind()
+{
+  glBindBuffer(m_target, 0);
+}
+
+StreamBuffer::MappingResult StreamBuffer::Map(u32 alignment, u32 min_size)
+{
+  return MappingResult{static_cast<void*>(m_cpu_buffer.data()), 0, 0, m_size / alignment};
+}
+
+void StreamBuffer::Unmap(u32 used_size)
+{
+  if (used_size == 0)
+    return;
+
+  glBindBuffer(m_target, m_buffer_id);
+  glBufferSubData(m_target, 0, used_size, m_cpu_buffer.data());
+}
+
+std::unique_ptr<StreamBuffer> StreamBuffer::Create(GLenum target, u32 size)
+{
+  glGetError();
+
+  GLuint buffer_id;
+  glGenBuffers(1, &buffer_id);
+  glBindBuffer(target, buffer_id);
+  glBufferData(target, size, nullptr, GL_STREAM_DRAW);
+
+  GLenum err = glGetError();
+  if (err != GL_NO_ERROR)
+  {
+    glDeleteBuffers(1, &buffer_id);
+    return {};
+  }
+
+  return std::unique_ptr<StreamBuffer>(new StreamBuffer(target, buffer_id, size));
+}
+
+} // namespace GL