Optimize rendering and enable VSync

1 files changed, 12 insertions, 4 deletions

diff --git a/graphics.cpp b/graphics.cpp
index afcd3b2..56d0532 100644
--- a/graphics.cpp
+++ b/graphics.cpp
@@ -5,6 +5,7 @@
 #include "vdp.hpp"
 
 #include <cstdlib>
+#include <cassert>
 
 static size_t kIntegerScaling = 2;
 
@@ -45,6 +46,14 @@ Graphics::Graphics()
         SDL_Quit();
         return;
     }
+    if (SDL_GL_SetSwapInterval(-1)) {
+        printf("Couldn't set adaptive VSync: falling back to hard VSync\n");
+        if (SDL_GL_SetSwapInterval(1)) {
+            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't set up VSync: %s\n", SDL_GetError());
+            SDL_Quit();
+            return;
+        }
+    }
 #endif
     _initialized_ok = true;
 }
@@ -76,10 +85,9 @@ void Graphics::Render(const VDP& vdp)
         // TODO probably should return and propagate error
         abort();
     }
-    for (size_t row = 0; row < VDP().kRenderHeight; row++) {
-        uint32_t *dst = (uint32_t*)((uint8_t*)pixels + row * pitch);
-        memcpy(dst, buffer + row * VDP().kRenderWidth, VDP().kRenderWidth * sizeof(*dst));
-    }
+    assert(pitch == VDP().kRenderWidth * sizeof(*buffer));
+    (void) pitch;
+    memcpy(pixels, buffer, VDP().kRenderWidth * VDP().kRenderHeight * sizeof(*buffer));
     SDL_UnlockTexture(_render_texture);
     SDL_RenderClear(_renderer);
     SDL_RenderCopy(_renderer, _render_texture, NULL, NULL);