1 files changed, 105 insertions, 0 deletions
diff --git a/drape/framebuffer.cpp b/drape/framebuffer.cpp
new file mode 100644
index 0000000000..73d79173f5
--- /dev/null
+++ b/drape/framebuffer.cpp
@@ -0,0 +1,105 @@
+#include "drape/framebuffer.hpp"
+
+#include "drape/glfunctions.hpp"
+#include "drape/oglcontext.hpp"
+
+#include "base/assert.hpp"
+#include "base/logging.hpp"
+#include "base/string_utils.hpp"
+
+namespace dp
+{
+Framebuffer::~Framebuffer() { Destroy(); }
+void Framebuffer::Destroy()
+{
+  if (m_colorTextureId != 0)
+  {
+    GLFunctions::glDeleteTexture(m_colorTextureId);
+    m_colorTextureId = 0;
+  }
+
+  if (m_depthTextureId != 0)
+  {
+    GLFunctions::glDeleteTexture(m_depthTextureId);
+    m_depthTextureId = 0;
+  }
+
+  if (m_framebufferId != 0)
+  {
+    GLFunctions::glDeleteFramebuffer(&m_framebufferId);
+    m_framebufferId = 0;
+  }
+}
+
+void Framebuffer::SetDefaultContext(dp::OGLContext * context) { m_defaultContext = context; }
+void Framebuffer::SetSize(uint32_t width, uint32_t height)
+{
+  ASSERT(m_defaultContext, ());
+
+  if (!m_isSupported)
+    return;
+
+  if (m_width == width && m_height == height)
+    return;
+
+  m_height = height;
+  m_width = width;
+
+  Destroy();
+
+  m_colorTextureId = GLFunctions::glGenTexture();
+  GLFunctions::glBindTexture(m_colorTextureId);
+  GLFunctions::glTexImage2D(m_width, m_height, gl_const::GLRGBA, gl_const::GLUnsignedByteType,
+                            nullptr);
+  GLFunctions::glTexParameter(gl_const::GLMagFilter, gl_const::GLLinear);
+  GLFunctions::glTexParameter(gl_const::GLMinFilter, gl_const::GLLinear);
+  GLFunctions::glTexParameter(gl_const::GLWrapT, gl_const::GLClampToEdge);
+  GLFunctions::glTexParameter(gl_const::GLWrapS, gl_const::GLClampToEdge);
+
+  m_depthTextureId = GLFunctions::glGenTexture();
+  GLFunctions::glBindTexture(m_depthTextureId);
+  GLFunctions::glTexImage2D(m_width, m_height, gl_const::GLDepthComponent,
+                            gl_const::GLUnsignedIntType, nullptr);
+  if (GLFunctions::CurrentApiVersion == dp::ApiVersion::OpenGLES3)
+  {
+    GLFunctions::glTexParameter(gl_const::GLMagFilter, gl_const::GLNearest);
+    GLFunctions::glTexParameter(gl_const::GLMinFilter, gl_const::GLNearest);
+    GLFunctions::glTexParameter(gl_const::GLWrapT, gl_const::GLClampToEdge);
+    GLFunctions::glTexParameter(gl_const::GLWrapS, gl_const::GLClampToEdge);
+  }
+
+  GLFunctions::glBindTexture(0);
+
+  GLFunctions::glGenFramebuffer(&m_framebufferId);
+  GLFunctions::glBindFramebuffer(m_framebufferId);
+
+  GLFunctions::glFramebufferTexture2D(gl_const::GLColorAttachment, m_colorTextureId);
+  GLFunctions::glFramebufferTexture2D(gl_const::GLDepthAttachment, m_depthTextureId);
+  GLFunctions::glFramebufferTexture2D(gl_const::GLStencilAttachment, 0);
+
+  uint32_t const status = GLFunctions::glCheckFramebufferStatus();
+  if (status != gl_const::GLFramebufferComplete)
+  {
+    m_isSupported = false;
+    Destroy();
+    LOG(LWARNING, ("Framebuffer is unsupported. Framebuffer status =", status));
+  }
+
+  m_defaultContext->setDefaultFramebuffer();
+}
+
+void Framebuffer::Enable()
+{
+  ASSERT(m_isSupported, ());
+  GLFunctions::glBindFramebuffer(m_framebufferId);
+}
+
+void Framebuffer::Disable()
+{
+  ASSERT(m_defaultContext, ());
+  ASSERT(m_isSupported, ());
+  m_defaultContext->setDefaultFramebuffer();
+}
+
+uint32_t Framebuffer::GetTextureId() const { return m_colorTextureId; }
+}  // namespace dp