cocoa: gl3: support querying of colors bit depth

Add support for querying the bit depth of the colors from the OpenGL
context. This allows to perform dithering correctly.

3 files changed, 21 insertions, 0 deletions

diff --git a/libvo/cocoa_common.h b/libvo/cocoa_common.h
index 1a2ec7bd75..943a5fb8ba 100644
--- a/libvo/cocoa_common.h
+++ b/libvo/cocoa_common.h
@@ -46,4 +46,6 @@ int vo_cocoa_swap_interval(int enabled);
 void *vo_cocoa_cgl_context(void);
 void *vo_cocoa_cgl_pixel_format(void);
 
+int vo_cocoa_cgl_color_size(void);
+
 #endif /* MPLAYER_COCOA_COMMON_H */
diff --git a/libvo/cocoa_common.m b/libvo/cocoa_common.m
index 04b325405b..5b2bc9ab4e 100644
--- a/libvo/cocoa_common.m
+++ b/libvo/cocoa_common.m
@@ -405,6 +405,22 @@ void *vo_cocoa_cgl_pixel_format(void)
     return [s->pixelFormat CGLPixelFormatObj];
 }
 
+int vo_cocoa_cgl_color_size(void)
+{
+    GLint value;
+    CGLDescribePixelFormat(vo_cocoa_cgl_pixel_format(), 0,
+                           kCGLPFAColorSize, &value);
+    switch (value) {
+        case 32:
+        case 24:
+            return 8;
+        case 16:
+            return 5;
+    }
+
+    return 8;
+}
+
 void create_menu()
 {
     NSMenu *menu;
diff --git a/libvo/gl_common.c b/libvo/gl_common.c
index cd618b443c..621bfa39a8 100644
--- a/libvo/gl_common.c
+++ b/libvo/gl_common.c
@@ -1727,6 +1727,9 @@ static int create_window_cocoa_gl3(struct MPGLContext *ctx, int gl_flags,
 {
     int rv = vo_cocoa_create_window(ctx->vo, d_width, d_height, flags, 1);
     getFunctions(ctx->gl, (void *)vo_cocoa_glgetaddr, NULL, true);
+    ctx->depth_r = vo_cocoa_cgl_color_size();
+    ctx->depth_g = vo_cocoa_cgl_color_size();
+    ctx->depth_b = vo_cocoa_cgl_color_size();
     return rv;
 }