rg_display: Added a way for targets to disable partial updates

Defining `RG_SCREEN_PARTIAL_UPDATES` to `0`/`false` will disable partial updates.
ducalex · Sep 3, 2024 · 5f0e9e8 · 5f0e9e8
1 parent da9c8bf
commit 5f0e9e8
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/components/retro-go/config.h b/components/retro-go/config.h
@@ -136,3 +136,7 @@
 #else
 #define RG_ZIP_SUPPORT 0
 #endif
+
+#ifndef RG_SCREEN_PARTIAL_UPDATES
+#define RG_SCREEN_PARTIAL_UPDATES 1
+#endif
diff --git a/components/retro-go/rg_display.c b/components/retro-go/rg_display.c
@@ -87,11 +87,12 @@ static inline void write_update(const rg_surface_t *update)
     const void *data = update->data + update->offset + (crop_top * stride) + (crop_left * RG_PIXEL_GET_SIZE(format));
     const uint16_t *palette = update->palette;
 
+    const bool partial_update = RG_SCREEN_PARTIAL_UPDATES;
+
     int lines_per_buffer = LCD_BUFFER_LENGTH / draw_width;
     int lines_remaining = draw_height;
     int lines_updated = 0;
     int window_top = -1;
-    bool partial = true;
 
     for (int y = 0; y < draw_height;)
     {
@@ -112,7 +113,7 @@ static inline void write_update(const rg_surface_t *update)
         uint16_t *line_buffer_ptr = line_buffer;
 
         uint32_t checksum = 0xFFFFFFFF;
-        bool need_update = !partial;
+        bool need_update = !partial_update;
 
         for (int i = 0; i < lines_to_copy; ++i)
         {
@@ -137,7 +138,7 @@ static inline void write_update(const rg_surface_t *update)
                 else
                     RENDER_LINE(uint16_t, buffer[x])
 
-                if (partial)
+                if (partial_update)
                 {
                     checksum = rg_hash((void*)(line_buffer_ptr - draw_width), draw_width * 2);
                 }