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Make backface culling work with vertex buffers

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Backface culling is enabled as part of cogl_enable so the different
rendering functions in Cogl need to explicitly opt-in to have backface
culling enabled. Cogl vertex buffers should allow backface culling so
they should check whether it is enabled and then set the appropriate
cogl_enable flag.
This commit is contained in:
Neil Roberts 2009-05-21 14:56:38 +01:00
parent 4f5a5f38f7
commit f13c3ee309
2 changed files with 6 additions and 3 deletions
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6
clutter/cogl/cogl.h.in
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@ -325,9 +325,9 @@ void cogl_enable_depth_test (gboolean setting);
*
* Sets whether textures positioned so that their backface is showing
* should be hidden. This can be used to efficiently draw two-sided
* textures or fully closed cubes without enabling depth testing. Only
* calls to cogl_texture_rectangle() and cogl_texture_polygon() are
* affected. Backface culling is disabled by default.
* textures or fully closed cubes without enabling depth testing. This
* only affects calls to the cogl_rectangle* family of functions and
* cogl_vertex_buffer_draw*. Backface culling is disabled by default.
*/
void cogl_enable_backface_culling (gboolean setting);

3
clutter/cogl/common/cogl-vertex-buffer.c
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@ -1647,6 +1647,9 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
enable_flags |= cogl_material_get_cogl_enable_flags (ctx->source_material);
if (ctx->enable_backface_culling)
enable_flags |= COGL_ENABLE_BACKFACE_CULLING;
cogl_enable (enable_flags);
}