[Platform/RGFW] add support for software rendering (#5773)

* add support for software rendering

* null check on freeing

* add back line

* rename framebuffer to surface

* add guard on free

* update makefile to prevent software on web

* update for mac

Author: CrackedPixel

src/Makefile

@@ -275,11 +275,20 @@ ifeq ($(TARGET_PLATFORM),PLATFORM_DRM)
     GRAPHICS ?= GRAPHICS_API_OPENGL_ES2
     #GRAPHICS = GRAPHICS_API_OPENGL_SOFTWARE # Uncomment to use software rendering
 endif
-ifeq ($(TARGET_PLATFORM),$(filter $(TARGET_PLATFORM),PLATFORM_WEB PLATFORM_WEB_RGFW))
+ifeq ($(TARGET_PLATFORM),PLATFORM_WEB)
     # On HTML5 OpenGL ES 2.0 is used, emscripten translates it to WebGL 1.0
     GRAPHICS ?= GRAPHICS_API_OPENGL_ES2
     #GRAPHICS = GRAPHICS_API_OPENGL_ES3
 endif
+ifeq ($(TARGET_PLATFORM),PLATFORM_WEB_RGFW)
+    # On HTML5 OpenGL ES 2.0 is used, emscripten translates it to WebGL 1.0
+    GRAPHICS ?= GRAPHICS_API_OPENGL_ES2
+    #GRAPHICS = GRAPHICS_API_OPENGL_ES3
+
+    ifeq ($(GRAPHICS),GRAPHICS_API_OPENGL_SOFTWARE)
+        $(error WEB_RGFW: Software rendering not supported!)
+    endif
+endif
 ifeq ($(TARGET_PLATFORM),PLATFORM_ANDROID)
     # By default use OpenGL ES 2.0 on Android
     GRAPHICS ?= GRAPHICS_API_OPENGL_ES2

src/platforms/rcore_desktop_rgfw.c

@@ -177,6 +177,13 @@ typedef struct {
     RGFW_window *window;                // Native display device (physical screen connection)
     RGFW_monitor *monitor;
     mg_gamepads minigamepad;
+
+    #if defined(GRAPHICS_API_OPENGL_SOFTWARE)
+        RGFW_surface *surface;
+        u8 *surfacePixels;
+        i32 surfaceWidth;
+        i32 surfaceHeight;
+    #endif
 } PlatformData;
 
 //----------------------------------------------------------------------------------
@@ -1121,7 +1128,35 @@ void DisableCursor(void)
 // Swap back buffer with front buffer (screen drawing)
 void SwapScreenBuffer(void)
 {
-    RGFW_window_swapBuffers_OpenGL(platform.window);
+    #if defined(GRAPHICS_API_OPENGL_SOFTWARE)
+    {
+        if (platform.surface)
+        {
+            // copy rlsw pixel data to the surface framebuffer
+            swReadPixels(0, 0, platform.surfaceWidth, platform.surfaceHeight, SW_RGBA, SW_UNSIGNED_BYTE, platform.surfacePixels);
+
+            // Mac wants a different pixel order. I cant seem to get this to work any other way
+            #if defined(__APPLE__)
+                unsigned char temp = 0;
+                unsigned char *p = NULL;
+                for (int i = 0; i < (platform.surfaceWidth * platform.surfaceHeight); i += 1)
+                {
+                    p = platform.surfacePixels + (i * 4);
+                    temp = p[0];
+                    p[0] = p[2];
+                    p[2] = temp;
+                }
+            #endif
+
+            // blit surface to the window
+            RGFW_window_blitSurface(platform.window, platform.surface);
+        }
+    }
+    #else
+    {
+        RGFW_window_swapBuffers_OpenGL(platform.window);
+    }
+    #endif
 }
 
 //----------------------------------------------------------------------------------
@@ -1315,6 +1350,9 @@ void PollInputEvents(void)
             // Window events are also polled (Minimized, maximized, close...)
             case RGFW_windowResized:
             {
+                // set flag that the window was resized
+                CORE.Window.resizedLastFrame = true;
+                
                 #if defined(__APPLE__)
                     if (FLAG_IS_SET(CORE.Window.flags, FLAG_WINDOW_HIGHDPI))
                     {
@@ -1363,7 +1401,42 @@ void PollInputEvents(void)
                     CORE.Window.currentFbo.width = CORE.Window.screen.width;
                     CORE.Window.currentFbo.height = CORE.Window.screen.height;
                 #endif
-                CORE.Window.resizedLastFrame = true;
+
+                #if defined(GRAPHICS_API_OPENGL_SOFTWARE)
+                    #if defined(__APPLE__)
+                        RGFW_monitor* currentMonitor = RGFW_window_getMonitor(platform.window);
+                        CORE.Window.screenScale = MatrixScale(currentMonitor->pixelRatio, currentMonitor->pixelRatio, 1.0f);
+                        SetupViewport(platform.window->w * currentMonitor->pixelRatio, platform.window->h * currentMonitor->pixelRatio);
+
+                        CORE.Window.render.width = CORE.Window.screen.width * currentMonitor->pixelRatio;
+                        CORE.Window.render.height = CORE.Window.screen.height * currentMonitor->pixelRatio;
+                        CORE.Window.currentFbo.width = CORE.Window.render.width;
+                        CORE.Window.currentFbo.height = CORE.Window.render.height;
+                    #endif
+                    platform.surfaceWidth = CORE.Window.currentFbo.width;
+                    platform.surfaceHeight = CORE.Window.currentFbo.height;
+
+                    // in software mode we dont have the viewport so we need to reverse the highdpi changes
+                    if (FLAG_IS_SET(CORE.Window.flags, FLAG_WINDOW_HIGHDPI))
+                    {
+                        Vector2 scaleDpi = GetWindowScaleDPI();
+                        platform.surfaceWidth *= scaleDpi.x;
+                        platform.surfaceHeight *= scaleDpi.y;
+                    }
+
+                    if (platform.surfacePixels != NULL)
+                    {
+                        RL_FREE(platform.surfacePixels);
+                        platform.surfacePixels = RL_MALLOC(platform.surfaceWidth * platform.surfaceHeight * 4);
+                    }
+
+                    if (platform.surface != NULL)
+                    {
+                        RGFW_surface_free(platform.surface);
+                        platform.surface = RGFW_window_createSurface(platform.window, platform.surfacePixels, platform.surfaceWidth, platform.surfaceHeight, RGFW_formatBGRA8);
+                        swResize(platform.surfaceWidth, platform.surfaceHeight);
+                    }
+                #endif
             } break;
             case RGFW_windowMaximized:
             {
@@ -1641,6 +1714,12 @@ int InitPlatform(void)
         hints->major = 4;
         hints->minor = 3;
     }
+    else if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+    {
+        hints->major = 1;
+        hints->minor = 1;
+        hints->renderer = RGFW_glSoftware;
+    }
 
     if (FLAG_IS_SET(CORE.Window.flags, FLAG_MSAA_4X_HINT)) hints->samples = 4;
 
@@ -1720,6 +1799,39 @@ int InitPlatform(void)
         #endif
     }
 
+    #if defined(GRAPHICS_API_OPENGL_SOFTWARE)
+        // apple always scales for retina
+        #if defined(__APPLE__)
+            RGFW_monitor* currentMonitor = RGFW_window_getMonitor(platform.window);
+            CORE.Window.screenScale = MatrixScale(currentMonitor->pixelRatio, currentMonitor->pixelRatio, 1.0f);
+
+            CORE.Window.render.width = CORE.Window.screen.width * currentMonitor->pixelRatio;
+            CORE.Window.render.height = CORE.Window.screen.height * currentMonitor->pixelRatio;
+            CORE.Window.currentFbo.width = CORE.Window.render.width;
+            CORE.Window.currentFbo.height = CORE.Window.render.height;
+        #endif
+
+        platform.surfaceWidth = CORE.Window.currentFbo.width;
+        platform.surfaceHeight = CORE.Window.currentFbo.height;
+
+        platform.surfacePixels = RL_MALLOC(platform.surfaceWidth * platform.surfaceHeight * 4);
+        if (platform.surfacePixels == NULL)
+        {
+            TRACELOG(LOG_FATAL, "PLATFORM: Failed to initialize software pixel buffer");
+            return -1;
+        }
+
+        platform.surface = RGFW_window_createSurface(platform.window, platform.surfacePixels, platform.surfaceWidth, platform.surfaceHeight, RGFW_formatBGRA8);
+
+        if (platform.surface == NULL)
+        {
+            RL_FREE(platform.surfacePixels);
+
+            TRACELOG(LOG_FATAL, "PLATFORM: Failed to initialize software surface");
+            return -1;
+        }
+    #endif
+
     TRACELOG(LOG_INFO, "DISPLAY: Device initialized successfully %s",
         FLAG_IS_SET(CORE.Window.flags, FLAG_WINDOW_HIGHDPI)? "(HighDPI)" : "");
     TRACELOG(LOG_INFO, "    > Display size: %i x %i", CORE.Window.display.width, CORE.Window.display.height);
@@ -1750,20 +1862,63 @@ int InitPlatform(void)
     //----------------------------------------------------------------------------
 
 #if defined(RGFW_WAYLAND)
-    if (RGFW_usingWayland()) TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Wayland): Initialized successfully");
-    else TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11 (fallback)): Initialized successfully");
+    if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+    {
+        if (RGFW_usingWayland()) TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Wayland, Software): Initialized successfully");
+        else TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11, Software (fallback)): Initialized successfully");
+    }
+    else
+    {
+        if (RGFW_usingWayland()) TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Wayland): Initialized successfully");
+        else TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11 (fallback)): Initialized successfully");
+    }
 #elif defined(RGFW_X11)
     #if defined(__APPLE__)
-        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11 (MacOS)): Initialized successfully");
+        if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+        {
+            TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11, Software, (MacOS)): Initialized successfully");
+        }
+        else
+        {
+            TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11, (MacOS)): Initialized successfully");
+        }
     #else
-        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11): Initialized successfully");
+        if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+        {
+            TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11, Software): Initialized successfully");
+        }
+        else
+        {
+            TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - X11): Initialized successfully");
+        }
     #endif
 #elif defined (RGFW_WINDOWS)
-    TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Win32): Initialized successfully");
+    if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Win32, Software): Initialized successfully");
+    }
+    else
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - Win32): Initialized successfully");
+    }
 #elif defined(RGFW_WASM)
-    TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - WASMs): Initialized successfully");
+    if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - WASMs, Software): Initialized successfully");
+    }
+    else
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - WASMs): Initialized successfully");
+    }
 #elif defined(RGFW_MACOS)
-    TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - MacOS): Initialized successfully");
+    if (rlGetVersion() == RL_OPENGL_SOFTWARE)
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - MacOS, Software): Initialized successfully");
+    }
+    else
+    {
+        TRACELOG(LOG_INFO, "PLATFORM: DESKTOP (RGFW - MacOS): Initialized successfully");
+    }
 #endif
 
     mg_gamepads_init(&platform.minigamepad);
@@ -1776,6 +1931,18 @@ void ClosePlatform(void)
 {
     mg_gamepads_free(&platform.minigamepad);
     RGFW_window_close(platform.window);
+
+    #if defined(GRAPHICS_API_OPENGL_SOFTWARE)
+        if (platform.surfacePixels != NULL)
+        {
+            RL_FREE(platform.surfacePixels);
+        }
+
+        if (platform.surface != NULL)
+        {
+            RGFW_surface_free(platform.surface);
+        }
+    #endif
 }
 
 // Keycode mapping