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Make backface culling be part of the legacy state

Browse Source 
This adds an internal function to set the backface culling state on a
pipeline. This includes properties to set the culling mode (front,
back or both) and also to set which face is considered the front
(COGL_WINDING_CLOCKWISE or COGL_WINDING_COUNTER_CLOCKWISE). The actual
front face flushed to GL depends on whether we are rendering to an
offscreen buffer or not. This means that when changing between on- and
off- screen framebuffers it now checks whether the last flushed
pipeline has backface culling enabled and forces a reflush of the cull
face state if so.

The backface culling is now set on a pipeline as part of the legacy
state. This is important because some code in Cogl assumes it can
flush a temporary pipeline to revert to a known state, but previously
this wouldn't disable backface culling so things such as flushing the
clip stack could get confused.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts 2011-09-15 11:25:39 +01:00 committed by Robert Bragg
parent 879ce7301a
commit dbff3a357e
12 changed files with 258 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
cogl/cogl-attribute.c
View File

@ -549,9 +549,6 @@ enable_gl_state (CoglDrawFlags flags,
_cogl_pipeline_flush_gl_state (source, skip_gl_color, n_tex_coord_attribs);
if (ctx->enable_backface_culling)
enable_flags |= COGL_ENABLE_BACKFACE_CULLING;
_cogl_bitmask_clear_all (&ctx->temp_bitmask);
/* Bind the attribute pointers. We need to do this after the
@ -726,7 +723,6 @@ enable_gl_state (CoglDrawFlags flags,
set_enabled_arrays (&ctx->arrays_enabled, &ctx->temp_bitmask);
_cogl_enable (enable_flags);
_cogl_flush_face_winding ();
return source;
}

3
cogl/cogl-context-private.h
View File

@ -74,8 +74,7 @@ struct _CoglContext
/* Enable cache */
unsigned long enable_flags;
gboolean enable_backface_culling;
CoglFrontWinding flushed_front_winding;
gboolean legacy_backface_culling_enabled;
/* A few handy matrix constants */
CoglMatrix identity_matrix;

4
cogl/cogl-context.c
View File

@ -216,8 +216,7 @@ cogl_context_new (CoglDisplay *display,
context->current_clip_stack_valid = FALSE;
context->current_clip_stack = NULL;
context->enable_backface_culling = FALSE;
context->flushed_front_winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
context->legacy_backface_culling_enabled = FALSE;
cogl_matrix_init_identity (&context->identity_matrix);
cogl_matrix_init_identity (&context->y_flip_matrix);
@ -369,7 +368,6 @@ cogl_context_new (CoglDisplay *display,
cogl_push_source (context->opaque_color_pipeline);
_cogl_pipeline_flush_gl_state (context->opaque_color_pipeline, FALSE, 0);
_cogl_enable (enable_flags);
_cogl_flush_face_winding ();
context->atlases = NULL;
g_hook_list_init (&context->atlas_reorganize_callbacks, sizeof (GHook));

2
cogl/cogl-ext-functions.h
View File

@ -106,6 +106,8 @@ COGL_EXT_FUNCTION (void, glFlush,
(void))
COGL_EXT_FUNCTION (void, glFrontFace,
(GLenum mode))
COGL_EXT_FUNCTION (void, glCullFace,
(GLenum mode))
COGL_EXT_FUNCTION (void, glGenTextures,
(GLsizei n, GLuint* textures))
COGL_EXT_FUNCTION (GLenum, glGetError,

25
cogl/cogl-framebuffer.c
View File

@ -39,6 +39,7 @@
#include "cogl-clip-stack.h"
#include "cogl-journal-private.h"
#include "cogl-winsys-private.h"
#include "cogl-pipeline-state-private.h"
#ifndef GL_FRAMEBUFFER
#define GL_FRAMEBUFFER 0x8D40
@ -1143,11 +1144,12 @@ notify_buffers_changed (CoglFramebuffer *old_draw_buffer,
_cogl_clip_stack_dirty ();
/* If the two draw framebuffers have a different color mask then we
need to ensure the logic ops are reflushed the next time
if (old_draw_buffer && new_draw_buffer)
{
/* If the two draw framebuffers have a different color mask then
we need to ensure the logic ops are reflushed the next time
something is drawn */
if (old_draw_buffer && new_draw_buffer &&
cogl_framebuffer_get_color_mask (old_draw_buffer) !=
if (cogl_framebuffer_get_color_mask (old_draw_buffer) !=
cogl_framebuffer_get_color_mask (new_draw_buffer))
{
ctx->current_pipeline_changes_since_flush |=
@ -1155,6 +1157,21 @@ notify_buffers_changed (CoglFramebuffer *old_draw_buffer,
ctx->current_pipeline_age--;
}
/* If we're switching from onscreen to offscreen and the last
flush pipeline is using backface culling then we also need to
reflush the cull face state because the winding order of the
front face is flipped for offscreen buffers */
if (old_draw_buffer->type != new_draw_buffer->type &&
ctx->current_pipeline &&
_cogl_pipeline_get_cull_face_mode (ctx->current_pipeline) !=
COGL_PIPELINE_CULL_FACE_MODE_NONE)
{
ctx->current_pipeline_changes_since_flush |=
COGL_PIPELINE_STATE_CULL_FACE;
ctx->current_pipeline_age--;
}
}
/* XXX:
* To support the deprecated cogl_set_draw_buffer API we keep track
* of the last onscreen framebuffer that was set so that it can

10
cogl/cogl-internal.h
View File

@ -32,12 +32,6 @@
#include <X11/Xutil.h>
#endif
typedef enum
{
COGL_FRONT_WINDING_CLOCKWISE,
COGL_FRONT_WINDING_COUNTER_CLOCKWISE
} CoglFrontWinding;
typedef enum {
COGL_BOXED_NONE,
COGL_BOXED_INT,
@ -98,7 +92,6 @@ cogl_gl_error_to_string (GLenum error_code);
#define COGL_ENABLE_ALPHA_TEST (1<<1)
#define COGL_ENABLE_VERTEX_ARRAY (1<<2)
#define COGL_ENABLE_COLOR_ARRAY (1<<3)
#define COGL_ENABLE_BACKFACE_CULLING (1<<4)
int
_cogl_get_format_bpp (CoglPixelFormat format);
@ -109,9 +102,6 @@ _cogl_enable (unsigned long flags);
unsigned long
_cogl_get_enable (void);
void
_cogl_flush_face_winding (void);
void
_cogl_transform_point (const CoglMatrix *matrix_mv,
const CoglMatrix *matrix_p,

52
cogl/cogl-pipeline-opengl.c
View File

@ -605,6 +605,58 @@ _cogl_pipeline_flush_color_blend_alpha_depth_state (
ctx->current_gl_color_mask = color_mask;
}
if (pipelines_difference & COGL_PIPELINE_STATE_CULL_FACE)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_CULL_FACE);
CoglPipelineCullFaceState *cull_face_state
= &authority->big_state->cull_face_state;
if (cull_face_state->mode == COGL_PIPELINE_CULL_FACE_MODE_NONE)
GE( ctx, glDisable (GL_CULL_FACE) );
else
{
CoglFramebuffer *draw_framebuffer = cogl_get_draw_framebuffer ();
gboolean invert_winding;
GE( ctx, glEnable (GL_CULL_FACE) );
switch (cull_face_state->mode)
{
case COGL_PIPELINE_CULL_FACE_MODE_NONE:
g_assert_not_reached ();
case COGL_PIPELINE_CULL_FACE_MODE_FRONT:
GE( ctx, glCullFace (GL_FRONT) );
break;
case COGL_PIPELINE_CULL_FACE_MODE_BACK:
GE( ctx, glCullFace (GL_BACK) );
break;
case COGL_PIPELINE_CULL_FACE_MODE_BOTH:
GE( ctx, glCullFace (GL_FRONT_AND_BACK) );
break;
}
/* If we are painting to an offscreen framebuffer then we
need to invert the winding of the front face because
everything is painted upside down */
invert_winding = cogl_is_offscreen (draw_framebuffer);
switch (cull_face_state->front_winding)
{
case COGL_WINDING_CLOCKWISE:
GE( ctx, glFrontFace (invert_winding ? GL_CCW : GL_CW) );
break;
case COGL_WINDING_COUNTER_CLOCKWISE:
GE( ctx, glFrontFace (invert_winding ? GL_CW : GL_CCW) );
break;
}
}
}
if (pipeline->real_blend_enable != ctx->gl_blend_enable_cache)
{
if (pipeline->real_blend_enable)

30
cogl/cogl-pipeline-private.h
View File

@ -429,6 +429,7 @@ typedef enum
COGL_PIPELINE_STATE_FOG_INDEX,
COGL_PIPELINE_STATE_POINT_SIZE_INDEX,
COGL_PIPELINE_STATE_LOGIC_OPS_INDEX,
COGL_PIPELINE_STATE_CULL_FACE_INDEX,
/* non-sparse */
COGL_PIPELINE_STATE_REAL_BLEND_ENABLE_INDEX,
@ -474,6 +475,8 @@ typedef enum _CoglPipelineState
1L<<COGL_PIPELINE_STATE_POINT_SIZE_INDEX,
COGL_PIPELINE_STATE_LOGIC_OPS =
1L<<COGL_PIPELINE_STATE_LOGIC_OPS_INDEX,
COGL_PIPELINE_STATE_CULL_FACE =
1L<<COGL_PIPELINE_STATE_CULL_FACE_INDEX,
COGL_PIPELINE_STATE_REAL_BLEND_ENABLE =
1L<<COGL_PIPELINE_STATE_REAL_BLEND_ENABLE_INDEX,
@ -508,7 +511,8 @@ typedef enum _CoglPipelineState
COGL_PIPELINE_STATE_DEPTH | \
COGL_PIPELINE_STATE_FOG | \
COGL_PIPELINE_STATE_POINT_SIZE | \
COGL_PIPELINE_STATE_LOGIC_OPS)
COGL_PIPELINE_STATE_LOGIC_OPS | \
COGL_PIPELINE_STATE_CULL_FACE)
#define COGL_PIPELINE_STATE_MULTI_PROPERTY \
(COGL_PIPELINE_STATE_LAYERS | \
@ -516,7 +520,8 @@ typedef enum _CoglPipelineState
COGL_PIPELINE_STATE_BLEND | \
COGL_PIPELINE_STATE_DEPTH | \
COGL_PIPELINE_STATE_FOG | \
COGL_PIPELINE_STATE_LOGIC_OPS)
COGL_PIPELINE_STATE_LOGIC_OPS | \
COGL_PIPELINE_STATE_CULL_FACE)
#define COGL_PIPELINE_STATE_AFFECTS_VERTEX_CODEGEN \
(COGL_PIPELINE_STATE_LAYERS | \
@ -557,6 +562,20 @@ typedef enum _CoglPipelineBlendEnable
COGL_PIPELINE_BLEND_ENABLE_AUTOMATIC
} CoglPipelineBlendEnable;
typedef enum
{
COGL_PIPELINE_CULL_FACE_MODE_NONE,
COGL_PIPELINE_CULL_FACE_MODE_FRONT,
COGL_PIPELINE_CULL_FACE_MODE_BACK,
COGL_PIPELINE_CULL_FACE_MODE_BOTH
} CoglPipelineCullFaceMode;
typedef enum
{
COGL_WINDING_CLOCKWISE,
COGL_WINDING_COUNTER_CLOCKWISE
} CoglWinding;
typedef struct
{
/* Determines how this pipeline is blended with other primitives */
@ -586,6 +605,12 @@ typedef struct
CoglColorMask color_mask;
} CoglPipelineLogicOpsState;
typedef struct
{
CoglPipelineCullFaceMode mode;
CoglWinding front_winding;
} CoglPipelineCullFaceState;
typedef struct
{
CoglPipelineLightingState lighting_state;
@ -596,6 +621,7 @@ typedef struct
CoglPipelineFogState fog_state;
float point_size;
CoglPipelineLogicOpsState logic_ops_state;
CoglPipelineCullFaceState cull_face_state;
} CoglPipelineBigState;
typedef enum

16
cogl/cogl-pipeline-state-private.h
View File

@ -35,6 +35,14 @@ void
_cogl_pipeline_set_fog_state (CoglPipeline *pipeline,
const CoglPipelineFogState *fog_state);
void
_cogl_pipeline_set_cull_face_state (CoglPipeline *pipeline,
const CoglPipelineCullFaceState *
cull_face_state);
CoglPipelineCullFaceMode
_cogl_pipeline_get_cull_face_mode (CoglPipeline *pipeline);
gboolean
_cogl_pipeline_color_equal (CoglPipeline *authority0,
CoglPipeline *authority1);
@ -75,6 +83,10 @@ gboolean
_cogl_pipeline_user_shader_equal (CoglPipeline *authority0,
CoglPipeline *authority1);
gboolean
_cogl_pipeline_cull_face_state_equal (CoglPipeline *authority0,
CoglPipeline *authority1);
void
_cogl_pipeline_hash_color_state (CoglPipeline *authority,
CoglPipelineHashState *state);
@ -123,4 +135,8 @@ void
_cogl_pipeline_hash_logic_ops_state (CoglPipeline *authority,
CoglPipelineHashState *state);
void
_cogl_pipeline_hash_cull_face_state (CoglPipeline *authority,
CoglPipelineHashState *state);
#endif /* __COGL_PIPELINE_STATE_PRIVATE_H */

90
cogl/cogl-pipeline-state.c
View File

@ -209,6 +209,27 @@ _cogl_pipeline_logic_ops_state_equal (CoglPipeline *authority0,
return logic_ops_state0->color_mask == logic_ops_state1->color_mask;
}
gboolean
_cogl_pipeline_cull_face_state_equal (CoglPipeline *authority0,
CoglPipeline *authority1)
{
CoglPipelineCullFaceState *cull_face_state0
= &authority0->big_state->cull_face_state;
CoglPipelineCullFaceState *cull_face_state1
= &authority1->big_state->cull_face_state;
/* The cull face state is considered equal if two pipelines are both
set to no culling. If the front winding property is ever used for
anything else or the comparison is used not just for drawing then
this would have to change */
if (cull_face_state0->mode == COGL_PIPELINE_CULL_FACE_MODE_NONE)
return cull_face_state1->mode == COGL_PIPELINE_CULL_FACE_MODE_NONE;
return (cull_face_state0->mode == cull_face_state1->mode &&
cull_face_state0->front_winding == cull_face_state1->front_winding);
}
gboolean
_cogl_pipeline_user_shader_equal (CoglPipeline *authority0,
CoglPipeline *authority1)
@ -1155,6 +1176,52 @@ _cogl_pipeline_set_fog_state (CoglPipeline *pipeline,
_cogl_pipeline_fog_state_equal);
}
void
_cogl_pipeline_set_cull_face_state (CoglPipeline *pipeline,
const CoglPipelineCullFaceState *
cull_face_state)
{
CoglPipelineState state = COGL_PIPELINE_STATE_CULL_FACE;
CoglPipeline *authority;
CoglPipelineCullFaceState *current_cull_face_state;
g_return_if_fail (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
current_cull_face_state = &authority->big_state->cull_face_state;
if (current_cull_face_state->mode == cull_face_state->mode &&
current_cull_face_state->front_winding == cull_face_state->front_winding)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
pipeline->big_state->cull_face_state = *cull_face_state;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_cull_face_state_equal);
}
CoglPipelineCullFaceMode
_cogl_pipeline_get_cull_face_mode (CoglPipeline *pipeline)
{
CoglPipelineState state = COGL_PIPELINE_STATE_CULL_FACE;
CoglPipeline *authority;
g_return_val_if_fail (cogl_is_pipeline (pipeline),
COGL_PIPELINE_CULL_FACE_MODE_NONE);
authority = _cogl_pipeline_get_authority (pipeline, state);
return authority->big_state->cull_face_state.mode;
}
float
cogl_pipeline_get_point_size (CoglPipeline *pipeline)
{
@ -1365,3 +1432,26 @@ _cogl_pipeline_hash_logic_ops_state (CoglPipeline *authority,
state->hash = _cogl_util_one_at_a_time_hash (state->hash, &logic_ops_state->color_mask,
sizeof (CoglColorMask));
}
void
_cogl_pipeline_hash_cull_face_state (CoglPipeline *authority,
CoglPipelineHashState *state)
{
CoglPipelineCullFaceState *cull_face_state
= &authority->big_state->cull_face_state;
/* The cull face state is considered equal if two pipelines are both
set to no culling. If the front winding property is ever used for
anything else or the hashing is used not just for drawing then
this would have to change */
if (cull_face_state->mode == COGL_PIPELINE_CULL_FACE_MODE_NONE)
state->hash =
_cogl_util_one_at_a_time_hash (state->hash,
&cull_face_state->mode,
sizeof (CoglPipelineCullFaceMode));
else
state->hash =
_cogl_util_one_at_a_time_hash (state->hash,
cull_face_state,
sizeof (CoglPipelineCullFaceState));
}

36
cogl/cogl-pipeline.c
View File

@ -190,6 +190,7 @@ _cogl_pipeline_init_default_pipeline (void)
CoglPipelineBlendState *blend_state = &big_state->blend_state;
CoglDepthState *depth_state = &big_state->depth_state;
CoglPipelineLogicOpsState *logic_ops_state = &big_state->logic_ops_state;
CoglPipelineCullFaceState *cull_face_state = &big_state->cull_face_state;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
@ -297,6 +298,9 @@ _cogl_pipeline_init_default_pipeline (void)
logic_ops_state->color_mask = COGL_COLOR_MASK_ALL;
cull_face_state->mode = COGL_PIPELINE_CULL_FACE_MODE_NONE;
cull_face_state->front_winding = COGL_WINDING_COUNTER_CLOCKWISE;
ctx->default_pipeline = _cogl_pipeline_object_new (pipeline);
}
@ -1047,6 +1051,13 @@ _cogl_pipeline_copy_differences (CoglPipeline *dest,
sizeof (CoglPipelineLogicOpsState));
}
if (differences & COGL_PIPELINE_STATE_CULL_FACE)
{
memcpy (&big_state->cull_face_state,
&src->big_state->cull_face_state,
sizeof (CoglPipelineCullFaceState));
}
/* XXX: we shouldn't bother doing this in most cases since
* _copy_differences is typically used to initialize pipeline state
* by copying it from the current authority, so it's not actually
@ -1124,6 +1135,13 @@ _cogl_pipeline_init_multi_property_sparse_state (CoglPipeline *pipeline,
sizeof (CoglPipelineLogicOpsState));
break;
}
case COGL_PIPELINE_STATE_CULL_FACE:
{
memcpy (&pipeline->big_state->cull_face_state,
&authority->big_state->cull_face_state,
sizeof (CoglPipelineCullFaceState));
break;
}
}
}
@ -2752,6 +2770,12 @@ _cogl_pipeline_equal (CoglPipeline *pipeline0,
_cogl_pipeline_fog_state_equal))
goto done;
if (!simple_property_equal (authorities0, authorities1,
pipelines_difference,
COGL_PIPELINE_STATE_CULL_FACE_INDEX,
_cogl_pipeline_cull_face_state_equal))
goto done;
if (!simple_property_equal (authorities0, authorities1,
pipelines_difference,
COGL_PIPELINE_STATE_POINT_SIZE_INDEX,
@ -3208,6 +3232,14 @@ _cogl_pipeline_apply_legacy_state (CoglPipeline *pipeline)
if (ctx->legacy_fog_state.enabled)
_cogl_pipeline_set_fog_state (pipeline, &ctx->legacy_fog_state);
if (ctx->legacy_backface_culling_enabled)
{
CoglPipelineCullFaceState state;
state.mode = COGL_PIPELINE_CULL_FACE_MODE_BACK;
state.front_winding = COGL_WINDING_COUNTER_CLOCKWISE;
_cogl_pipeline_set_cull_face_state (pipeline, &state);
}
}
void
@ -3346,13 +3378,15 @@ _cogl_pipeline_init_state_hash_functions (void)
_cogl_pipeline_hash_depth_state;
state_hash_functions[COGL_PIPELINE_STATE_FOG_INDEX] =
_cogl_pipeline_hash_fog_state;
state_hash_functions[COGL_PIPELINE_STATE_CULL_FACE_INDEX] =
_cogl_pipeline_hash_cull_face_state;
state_hash_functions[COGL_PIPELINE_STATE_POINT_SIZE_INDEX] =
_cogl_pipeline_hash_point_size_state;
state_hash_functions[COGL_PIPELINE_STATE_LOGIC_OPS_INDEX] =
_cogl_pipeline_hash_logic_ops_state;
/* So we get a big error if we forget to update this code! */
g_assert (COGL_PIPELINE_STATE_SPARSE_COUNT == 12);
g_assert (COGL_PIPELINE_STATE_SPARSE_COUNT == 13);
}
unsigned int

79
cogl/cogl.c
View File

@ -141,33 +141,6 @@ cogl_clear (const CoglColor *color, unsigned long buffers)
cogl_framebuffer_clear (cogl_get_draw_framebuffer (), buffers, color);
}
static gboolean
toggle_flag (CoglContext *ctx,
unsigned long new_flags,
unsigned long flag,
GLenum gl_flag)
{
/* Toggles and caches a single enable flag on or off
* by comparing to current state
*/
if (new_flags & flag)
{
if (!(ctx->enable_flags & flag))
{
GE( ctx, glEnable (gl_flag) );
ctx->enable_flags |= flag;
return TRUE;
}
}
else if (ctx->enable_flags & flag)
{
GE( ctx, glDisable (gl_flag) );
ctx->enable_flags &= ~flag;
}
return FALSE;
}
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
static gboolean
@ -209,10 +182,6 @@ _cogl_enable (unsigned long flags)
*/
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
toggle_flag (ctx, flags,
COGL_ENABLE_BACKFACE_CULLING,
GL_CULL_FACE);
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
if (ctx->driver != COGL_DRIVER_GLES2)
{
@ -264,13 +233,15 @@ cogl_set_backface_culling_enabled (gboolean setting)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->enable_backface_culling == setting)
if (ctx->legacy_backface_culling_enabled == setting)
return;
/* Currently the journal can't track changes to backface culling state... */
_cogl_framebuffer_flush_journal (cogl_get_draw_framebuffer ());
ctx->legacy_backface_culling_enabled = setting;
ctx->enable_backface_culling = setting;
if (ctx->legacy_backface_culling_enabled)
ctx->legacy_state_set++;
else
ctx->legacy_state_set--;
}
gboolean
@ -278,39 +249,7 @@ cogl_get_backface_culling_enabled (void)
{
_COGL_GET_CONTEXT (ctx, FALSE);
return ctx->enable_backface_culling;
}
void
_cogl_flush_face_winding (void)
{
CoglFrontWinding winding;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* The front face winding doesn't matter if we aren't performing any
* backface culling... */
if (!ctx->enable_backface_culling)
return;
/* NB: We use a clockwise face winding order when drawing offscreen because
* all offscreen rendering is done upside down resulting in reversed winding
* for all triangles.
*/
if (cogl_is_offscreen (cogl_get_draw_framebuffer ()))
winding = COGL_FRONT_WINDING_CLOCKWISE;
else
winding = COGL_FRONT_WINDING_COUNTER_CLOCKWISE;
if (winding != ctx->flushed_front_winding)
{
if (winding == COGL_FRONT_WINDING_CLOCKWISE)
GE (ctx, glFrontFace (GL_CW));
else
GE (ctx, glFrontFace (GL_CCW));
ctx->flushed_front_winding = winding;
}
return ctx->legacy_backface_culling_enabled;
}
void
@ -726,11 +665,7 @@ cogl_begin_gl (void)
FALSE,
cogl_pipeline_get_n_layers (pipeline));
if (ctx->enable_backface_culling)
enable_flags |= COGL_ENABLE_BACKFACE_CULLING;
_cogl_enable (enable_flags);
_cogl_flush_face_winding ();
/* Disable any cached vertex arrays */
_cogl_attribute_disable_cached_arrays ();