framebuffer: Add cogl_framebuffer draw methods

This adds cogl_framebuffer_ apis for drawing attributes and primitives
that replace corresponding apis that depend on the default CoglContext.
This is part of the on going effort to adapt the Cogl api so it no
longer depends on a global context variable.

All the new drawing functions also take an explicit pipeline argument
since we are also aiming to avoid being a stateful api like Cairo and
OpenGL. Being stateless makes it easier for orthogonal components to
share access to the GPU. Being stateless should also minimize any
impedance miss-match for those wanting to build higher level stateless
apis on top of Cogl.

Note: none of the legacy, global state options such as
cogl_set_depth_test_enabled(), cogl_set_backface_culling_enabled() or
cogl_program_use() are supported by these new drawing apis and if set
will simply be silently ignored.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

1 files changed, 8 insertions, 17 deletions

diff --git a/cogl/cogl-attribute-private.h b/cogl/cogl-attribute-private.h
index 68ed52d0..d977376f 100644
--- a/cogl/cogl-attribute-private.h
+++ b/cogl/cogl-attribute-private.h
@@ -69,13 +69,14 @@ typedef enum
   COGL_DRAW_SKIP_JOURNAL_FLUSH = 1 << 0,
   COGL_DRAW_SKIP_PIPELINE_VALIDATION = 1 << 1,
   COGL_DRAW_SKIP_FRAMEBUFFER_FLUSH = 1 << 2,
+  COGL_DRAW_SKIP_LEGACY_STATE = 1 << 3,
   /* By default the vertex attribute drawing code will assume that if
      there is a color attribute array enabled then we can't determine
      if the colors will be opaque so we need to enabling
      blending. However when drawing from the journal we know what the
      contents of the color array is so we can override this by passing
      this flag. */
-  COGL_DRAW_COLOR_ATTRIBUTE_IS_OPAQUE = 1 << 3
+  COGL_DRAW_COLOR_ATTRIBUTE_IS_OPAQUE = 1 << 4
 } CoglDrawFlags;
 
 /* During CoglContext initialization we register the "cogl_color_in"
@@ -95,24 +96,14 @@ void
 _cogl_attribute_immutable_unref (CoglAttribute *attribute);
 
 void
-_cogl_draw_attributes (CoglVerticesMode mode,
-                       int first_vertex,
-                       int n_vertices,
-                       CoglAttribute **attributes,
-                       int n_attributes,
-                       CoglDrawFlags flags);
-
-void
-_cogl_draw_indexed_attributes (CoglVerticesMode mode,
-                               int first_vertex,
-                               int n_vertices,
-                               CoglIndices *indices,
-                               CoglAttribute **attributes,
-                               int n_attributes,
-                               CoglDrawFlags flags);
+_cogl_attribute_disable_cached_arrays (void);
 
 void
-_cogl_attribute_disable_cached_arrays (void);
+_cogl_flush_attributes_state (CoglFramebuffer *framebuffer,
+                              CoglPipeline *pipeline,
+                              CoglDrawFlags flags,
+                              CoglAttribute **attributes,
+                              int n_attributes);
 
 #endif /* __COGL_ATTRIBUTE_PRIVATE_H */