Mesa (master): mesa: add helper functions for geometry of gl_framebuffer

[Martin Peres]

Module: Mesa
Branch: master
Commit: 74987977a36a7111281e8fb53568dc05dbd3a8b4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=74987977a36a7111281e8fb53568dc05dbd3a8b4

Author: Kevin Rogovin <kevin.rogovin at intel.com>
Date:   Wed Jun 17 13:29:53 2015 +0300

mesa: add helper functions for geometry of gl_framebuffer

Add convenience helper functions for fetching geometry of gl_framebuffer
that return the geometry of the gl_framebuffer instead of the geometry of
the buffers of the gl_framebuffer when then the gl_framebuffer has no
attachments.

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Signed-off-by: Kevin Rogovin <kevin.rogovin at intel.com>

---

 src/mesa/main/framebuffer.h |   28 ++++++++++++++++++++++++++++
 src/mesa/main/mtypes.h      |    8 +++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/framebuffer.h b/src/mesa/main/framebuffer.h
index d02b86f..ca286e9 100644
--- a/src/mesa/main/framebuffer.h
+++ b/src/mesa/main/framebuffer.h
@@ -76,6 +76,34 @@ _mesa_scissor_bounding_box(const struct gl_context *ctx,
                            const struct gl_framebuffer *buffer,
                            unsigned idx, int *bbox);
 
+static inline GLuint
+_mesa_geometric_width(const struct gl_framebuffer *buffer)
+{
+   return buffer->_HasAttachments ?
+      buffer->Width : buffer->DefaultGeometry.Width;
+}
+
+static inline GLuint
+_mesa_geometric_height(const struct gl_framebuffer *buffer)
+{
+   return buffer->_HasAttachments ?
+      buffer->Height : buffer->DefaultGeometry.Height;
+}
+
+static inline GLuint
+_mesa_geometric_samples(const struct gl_framebuffer *buffer)
+{
+   return buffer->_HasAttachments ?
+      buffer->Visual.samples : buffer->DefaultGeometry.NumSamples;
+}
+
+static inline GLuint
+_mesa_geometric_layers(const struct gl_framebuffer *buffer)
+{
+   return buffer->_HasAttachments ?
+      buffer->MaxNumLayers : buffer->DefaultGeometry.Layers;
+}
+
 extern void 
 _mesa_update_draw_buffer_bounds(struct gl_context *ctx,
                                 struct gl_framebuffer *drawFb);
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index e9f70e2..a10e494 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3174,7 +3174,13 @@ struct gl_framebuffer
     * GL_ARB_framebuffer_no_attachments must check for the flag _HasAttachments
     * and if GL_FALSE, must then use the values in DefaultGeometry to initialize
     * its viewport, scissor and so on (in particular _Xmin, _Xmax, _Ymin and
-    * _Ymax do NOT take into account _HasAttachments being false)
+    * _Ymax do NOT take into account _HasAttachments being false). To get the
+    * geometry of the framebuffer, the  helper functions
+    *   _mesa_geometric_width(),
+    *   _mesa_geometric_height(),
+    *   _mesa_geometric_samples() and
+    *   _mesa_geometric_layers()
+    * are available that check _HasAttachments.
     */
    bool _HasAttachments;