Ken Thomases : winemac: Avoid overdriving single-buffered GL if possible; the system throttles us.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 3c7bc8202c3fbf63b36572b9ac97f980d25152ce
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=3c7bc8202c3fbf63b36572b9ac97f980d25152ce

Author: Ken Thomases <ken at codeweavers.com>
Date:   Fri Jun 21 03:34:03 2013 -0500

winemac: Avoid overdriving single-buffered GL if possible; the system throttles us.

Use glFlushRenderAPPLE(), if available, instead of glFlush() calls less
than 1/60th of a second since the last.

---

 dlls/winemac.drv/opengl.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/dlls/winemac.drv/opengl.c b/dlls/winemac.drv/opengl.c
index 931b9ee..904158b 100644
--- a/dlls/winemac.drv/opengl.c
+++ b/dlls/winemac.drv/opengl.c
@@ -66,6 +66,7 @@ struct wgl_context
     struct wgl_pbuffer     *read_pbuffer;
     BOOL                    has_been_current;
     BOOL                    sharing;
+    DWORD                   last_flush_time;
 };
 
 
@@ -101,6 +102,8 @@ static const char *opengl_func_names[] = { ALL_WGL_FUNCS };
 static void (*pglCopyColorTable)(GLenum target, GLenum internalformat, GLint x, GLint y,
                                  GLsizei width);
 static void (*pglCopyPixels)(GLint x, GLint y, GLsizei width, GLsizei height, GLenum type);
+static void (*pglFlush)(void);
+static void (*pglFlushRenderAPPLE)(void);
 static void (*pglReadPixels)(GLint x, GLint y, GLsizei width, GLsizei height,
                              GLenum format, GLenum type, void *pixels);
 static void (*pglViewport)(GLint x, GLint y, GLsizei width, GLsizei height);
@@ -1490,6 +1493,28 @@ static void macdrv_glCopyPixels(GLint x, GLint y, GLsizei width, GLsizei height,
 }
 
 
+static void macdrv_glFlush(void)
+{
+    struct wgl_context *context = NtCurrentTeb()->glContext;
+    const pixel_format *pf = &pixel_formats[context->format - 1];
+    DWORD now = GetTickCount();
+
+    TRACE("double buffer %d last flush time %d now %d\n", (int)pf->double_buffer,
+          context->last_flush_time, now);
+    if (pglFlushRenderAPPLE && !pf->double_buffer && (now - context->last_flush_time) < 17)
+    {
+        TRACE("calling glFlushRenderAPPLE()\n");
+        pglFlushRenderAPPLE();
+    }
+    else
+    {
+        TRACE("calling glFlush()\n");
+        pglFlush();
+        context->last_flush_time = now;
+    }
+}
+
+
 /**********************************************************************
  *              macdrv_glReadPixels
  *
@@ -3024,6 +3049,7 @@ static BOOL init_opengl(void)
 #define REDIRECT(func) \
     do { p##func = opengl_funcs.gl.p_##func; opengl_funcs.gl.p_##func = macdrv_##func; } while(0)
     REDIRECT(glCopyPixels);
+    REDIRECT(glFlush);
     REDIRECT(glReadPixels);
     REDIRECT(glViewport);
 #undef REDIRECT
@@ -3037,6 +3063,9 @@ static BOOL init_opengl(void)
     if (!init_gl_info())
         goto failed;
 
+    if (gluCheckExtension((GLubyte*)"GL_APPLE_flush_render", (GLubyte*)gl_info.glExtensions))
+        pglFlushRenderAPPLE = wine_dlsym(opengl_handle, "glFlushRenderAPPLE", NULL, 0);
+
     load_extensions();
     if (!init_pixel_formats())
         goto failed;