impl sdl platform

src/platforms/rcore_desktop_sdl.c

@@ -54,11 +54,13 @@
 #endif
 #include "SDL.h"                // SDL base library (window/rendered, input, timing... functionality)
 
-#if defined(GRAPHICS_API_OPENGL_ES2)
+#if !defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+    #if defined(GRAPHICS_API_OPENGL_ES2)
         // It seems it does not need to be included to work
         //#include "SDL_opengles2.h"
-#else
+    #else
         #include "SDL_opengl.h"     // SDL OpenGL functionality (if required, instead of internal renderer)
+    #endif
 #endif
 
 //----------------------------------------------------------------------------------
@@ -1215,7 +1217,14 @@ void DisableCursor(void)
 // Swap back buffer with front buffer (screen drawing)
 void SwapScreenBuffer(void)
 {
+#if defined(GRAPHICS_API_OPENGL_11_SOFTWARE)
+    // NOTE: We use a preprocessor condition here because `rlCopyFramebuffer` is only declared for software rendering
+    SDL_Surface* surface = SDL_GetWindowSurface(platform.window);
+    rlCopyFramebuffer(0, 0, CORE.Window.render.width, CORE.Window.render.height, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, surface->pixels);
+    SDL_UpdateWindowSurface(platform.window);
+#else
     SDL_GL_SwapWindow(platform.window);
+#endif
 }
 
 //----------------------------------------------------------------------------------
@@ -1895,7 +1904,6 @@ int InitPlatform(void)
     //----------------------------------------------------------------------------
     unsigned int flags = 0;
     flags |= SDL_WINDOW_SHOWN;
-    flags |= SDL_WINDOW_OPENGL;
     flags |= SDL_WINDOW_INPUT_FOCUS;
     flags |= SDL_WINDOW_MOUSE_FOCUS;
     flags |= SDL_WINDOW_MOUSE_CAPTURE;  // Window has mouse captured
@@ -1930,6 +1938,11 @@ int InitPlatform(void)
 
     // NOTE: Some OpenGL context attributes must be set before window creation
 
+    if (rlGetVersion() != RL_OPENGL_11_SOFTWARE)
+    {
+        // Add the flag telling the window to use an OpenGL context
+        flags |= SDL_WINDOW_OPENGL;
+
         // Check selection OpenGL version
         if (rlGetVersion() == RL_OPENGL_21)
         {
@@ -1947,9 +1960,9 @@ int InitPlatform(void)
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-#if defined(RLGL_ENABLE_OPENGL_DEBUG_CONTEXT)
+    #if defined(RLGL_ENABLE_OPENGL_DEBUG_CONTEXT)
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_DEBUG_FLAG);   // Enable OpenGL Debug Context
-#endif
+    #endif
         }
         else if (rlGetVersion() == RL_OPENGL_ES_20)                 // Request OpenGL ES 2.0 context
         {
@@ -1969,6 +1982,7 @@ int InitPlatform(void)
             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
         }
+    }
 
     // Init window
 #if defined(PLATFORM_DESKTOP_SDL3)
@@ -1978,10 +1992,12 @@ int InitPlatform(void)
 #endif
 
     // Init OpenGL context
+    if (rlGetVersion() != RL_OPENGL_11_SOFTWARE)
+    {
         platform.glContext = SDL_GL_CreateContext(platform.window);
+    }
 
-    // Check window and glContext have been initialized successfully
+    if ((platform.window != NULL) && ((rlGetVersion() == RL_OPENGL_11_SOFTWARE) || (platform.glContext != NULL)))
-    if ((platform.window != NULL) && (platform.glContext != NULL))
     {
         CORE.Window.ready = true;
 
@@ -2002,8 +2018,14 @@ int InitPlatform(void)
         TRACELOG(LOG_INFO, "    > Render size:  %i x %i", CORE.Window.render.width, CORE.Window.render.height);
         TRACELOG(LOG_INFO, "    > Viewport offsets: %i, %i", CORE.Window.renderOffset.x, CORE.Window.renderOffset.y);
 
-        if (CORE.Window.flags & FLAG_VSYNC_HINT) SDL_GL_SetSwapInterval(1);
+        if (platform.glContext != NULL)
-        else SDL_GL_SetSwapInterval(0);
+        {
+            SDL_GL_SetSwapInterval((CORE.Window.flags & FLAG_VSYNC_HINT)? 1 : 0);
+
+            // Load OpenGL extensions
+            // NOTE: GL procedures address loader is required to load extensions
+            rlLoadExtensions(SDL_GL_GetProcAddress);
+        }
     }
     else
     {
@@ -2011,9 +2033,6 @@ int InitPlatform(void)
         return -1;
     }
 
-    // Load OpenGL extensions
-    // NOTE: GL procedures address loader is required to load extensions
-    rlLoadExtensions(SDL_GL_GetProcAddress);
     //----------------------------------------------------------------------------
 
     // Initialize input events system
@@ -2078,7 +2097,7 @@ int InitPlatform(void)
 void ClosePlatform(void)
 {
     SDL_FreeCursor(platform.cursor); // Free cursor
-    SDL_GL_DeleteContext(platform.glContext); // Deinitialize OpenGL context
+    if (platform.glContext != NULL) SDL_GL_DeleteContext(platform.glContext); // Deinitialize OpenGL context
     SDL_DestroyWindow(platform.window);
     SDL_Quit(); // Deinitialize SDL internal global state
 }