Replicate speed optimization from Citra libretro

libretro · Jun 10, 2017 · 3ea9f94 · 3ea9f94
1 parent 6927521
commit 3ea9f94
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Showing 2 changed files with 12 additions and 3 deletions.
diff --git a/core/libretro/libretro.cpp b/core/libretro/libretro.cpp
@@ -393,12 +393,16 @@ static void update_variables(void)
       enable_purupuru = (strcmp("enabled", var.value) == 0);
 }
 
+bool doCleanFrame = false;
+
 void retro_run (void)
 {
    bool updated = false;
    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
       update_variables();
 
+   doCleanFrame = true;
+
    if (first_run)
    {
       dc_init(co_argc,co_argv);

diff --git a/core/rend/gles/gl_backend.cpp b/core/rend/gles/gl_backend.cpp
@@ -1770,6 +1770,7 @@ static void vertex_buffer_unmap(void)
 
 extern bool update_zmax;
 extern bool update_zmin;
+extern bool doCleanFrame;
 
 #ifdef MSB_FIRST
 #define INDEX_GET(a) (a^3)
@@ -2201,11 +2202,15 @@ static bool RenderFrame(void)
 		BindRTT(FB_W_SOF1&VRAM_MASK,FB_X_CLIP.max-FB_X_CLIP.min+1,FB_Y_CLIP.max-FB_Y_CLIP.min+1,channels,format);
 	}
 
-   glClearColor(0, 0, 0, 1.0f);
-	glClearDepth(0.f);
 
    glViewport(0, 0, gles_screen_width, gles_screen_height);
-	glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+   if (doCleanFrame)
+   {
+      glClearColor(0, 0, 0, 1.0f);
+      glClearDepth(0.f);
+      glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+      doCleanFrame = false;
+   }
 
 	if (UsingAutoSort())
 		GenSorted();