egl: Simplify queries for EGL_RENDER_BUFFER

[mesa.git] / src / egl / main / eglsurface.c

diff --git a/src/egl/main/eglsurface.c b/src/egl/main/eglsurface.c
index 3bd14a8cd034e1c2d1583c4ef758cac6d65dafb1..73c31e115884e63ce924926ec0bf1d1913018ba6 100644 (file)
--- a/src/egl/main/eglsurface.c
+++ b/src/egl/main/eglsurface.c
@@ -122,7 +122,7 @@ _eglParseSurfaceAttribList(_EGLSurface *surf, const EGLint *attrib_list)
             err = EGL_BAD_ATTRIBUTE;
             break;
          }
-         surf->RenderBuffer = val;
+         surf->RequestedRenderBuffer = val;
          break;
       case EGL_POST_SUB_BUFFER_SUPPORTED_NV:
          if (!dpy->Extensions.NV_post_sub_buffer ||
@@ -285,7 +285,8 @@ _eglInitSurface(_EGLSurface *surf, _EGLDisplay *dpy, EGLint type,
    surf->TextureTarget = EGL_NO_TEXTURE;
    surf->MipmapTexture = EGL_FALSE;
    surf->LargestPbuffer = EGL_FALSE;
-   surf->RenderBuffer = renderBuffer;
+   surf->RequestedRenderBuffer = renderBuffer;
+   surf->ActiveRenderBuffer = renderBuffer;
    surf->VGAlphaFormat = EGL_VG_ALPHA_FORMAT_NONPRE;
    surf->VGColorspace = EGL_VG_COLORSPACE_sRGB;
    surf->GLColorspace = EGL_GL_COLORSPACE_LINEAR_KHR;
@@ -358,7 +359,28 @@ _eglQuerySurface(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surface,
       *value = surface->SwapBehavior;
       break;
    case EGL_RENDER_BUFFER:
-      *value = surface->RenderBuffer;
+      /* From the EGL 1.5 spec (2014.08.27):
+       *
+       *    Querying EGL_RENDER_BUFFER returns the buffer which client API
+       *    rendering is requested to use. For a window surface, this is the
+       *    same attribute value specified when the surface was created. For
+       *    a pbuffer surface, it is always EGL_BACK_BUFFER . For a pixmap
+       *    surface, it is always EGL_SINGLE_BUFFER . To determine the actual
+       *    buffer being rendered to by a context, call eglQueryContext.
+       */
+      switch (surface->Type) {
+      default:
+         unreachable("bad EGLSurface type");
+      case EGL_WINDOW_BIT:
+         *value = surface->RequestedRenderBuffer;
+         break;
+      case EGL_PBUFFER_BIT:
+         *value = EGL_BACK_BUFFER;
+         break;
+      case EGL_PIXMAP_BIT:
+         *value = EGL_SINGLE_BUFFER;
+         break;
+      }
       break;
    case EGL_PIXEL_ASPECT_RATIO:
       *value = surface->AspectRatio;