From 8dcca49f42627400773dcc707ebaa757cbeef37b Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Thu, 4 Dec 2025 22:23:45 +0800
Subject: Impl sdl opengl renderer.

---
 include/cru/platform/graphics/cairo/CairoPainter.h |  4 ++++
 include/cru/platform/gui/sdl/OpenGLRenderer.h      | 27 +++++++++++++++++++++-
 include/cru/platform/gui/sdl/Window.h              |  7 ++++--
 3 files changed, 35 insertions(+), 3 deletions(-)

(limited to 'include')

diff --git a/include/cru/platform/graphics/cairo/CairoPainter.h b/include/cru/platform/graphics/cairo/CairoPainter.h
index 0833e42b..039cef60 100644
--- a/include/cru/platform/graphics/cairo/CairoPainter.h
+++ b/include/cru/platform/graphics/cairo/CairoPainter.h
@@ -4,6 +4,7 @@
 #include <cru/base/Base.h>
 #include <cru/platform/graphics/Painter.h>
 
+#include <functional>
 #include <vector>
 
 namespace cru::platform::graphics::cairo {
@@ -48,6 +49,8 @@ class CRU_PLATFORM_GRAPHICS_CAIRO_API CairoPainter : public CairoResource,
 
   void EndDraw() override;
 
+  void SetEndDrawCallback(std::function<void()> action);
+
  private:
   void CheckValidation();
 
@@ -55,6 +58,7 @@ class CRU_PLATFORM_GRAPHICS_CAIRO_API CairoPainter : public CairoResource,
 
   cairo_t* cairo_;
   bool auto_release_;
+  std::function<void()> end_draw_callback_;
 
   cairo_surface_t* cairo_surface_;
 
diff --git a/include/cru/platform/gui/sdl/OpenGLRenderer.h b/include/cru/platform/gui/sdl/OpenGLRenderer.h
index 2db9d68d..18de3d55 100644
--- a/include/cru/platform/gui/sdl/OpenGLRenderer.h
+++ b/include/cru/platform/gui/sdl/OpenGLRenderer.h
@@ -3,8 +3,13 @@
 #include "gl.h"
 
 #include <cru/base/Base.h>
+#include <cru/base/Guard.h>
+#include <cru/platform/GraphicsBase.h>
+#include <cru/platform/graphics/Painter.h>
+#include <cru/platform/gui/Base.h>
 
 #include <SDL3/SDL_video.h>
+#include <cairo.h>
 
 namespace cru::platform::gui::sdl {
 class SdlWindow;
@@ -12,14 +17,34 @@ class SdlWindow;
 class SdlOpenGLRenderer {
   CRU_DEFINE_CLASS_LOG_TAG("cru::platform::gui::sdl::SdlOpenGLRenderer")
  public:
-  explicit SdlOpenGLRenderer(SdlWindow* window);
+  SdlOpenGLRenderer(SdlWindow* window, int width, int height);
   ~SdlOpenGLRenderer();
 
+  void Resize(int width, int height);
+  std::unique_ptr<graphics::IPainter> BeginPaint();
+  void Present();
+
+ private:
+  GLuint CreateGLProgram();
+  Guard MakeContextCurrent();
+
  private:
   SdlWindow* window_;
   SDL_Window* sdl_window_;
   SDL_WindowID sdl_window_id_;
+
+  int width_, height_;
+
   SDL_GLContext sdl_gl_context_;
   GladGLContext glad_gl_context_;
+
+  GLuint gl_shader_program_;
+  GLuint gl_vertex_array_;
+  GLuint gl_vertex_buffer_;
+  GLuint gl_element_buffer_;
+  GLuint gl_texture_;
+
+  cairo_surface_t* cairo_surface_;
+  cairo_t* cairo_;
 };
 }  // namespace cru::platform::gui::sdl
diff --git a/include/cru/platform/gui/sdl/Window.h b/include/cru/platform/gui/sdl/Window.h
index 28837c71..41e5befb 100644
--- a/include/cru/platform/gui/sdl/Window.h
+++ b/include/cru/platform/gui/sdl/Window.h
@@ -2,6 +2,7 @@
 #include "Base.h"
 
 #include <cru/platform/GraphicsBase.h>
+#include <cru/platform/gui/UiApplication.h>
 #include <cru/platform/gui/Window.h>
 
 #include <SDL3/SDL_events.h>
@@ -114,11 +115,13 @@ class SdlWindow : public SdlResource, public virtual INativeWindow {
 
 #ifdef __unix
  private:
-  void UnixOnCreateWindow();
-  void UnixOnDestroyWindow();
+  void UnixOnCreate(int width, int height);
+  void UnixOnDestroy();
+  void UnixOnResize(int width, int height);
 
  private:
   std::unique_ptr<SdlOpenGLRenderer> renderer_;
+  TimerAutoCanceler repaint_timer_canceler_;
 #endif
 };
 }  // namespace cru::platform::gui::sdl
-- 
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