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cogl-clip-stack: Don't convert rect clips to window clips

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Previously in cogl-clip-state.c when it detected that the current
modelview matrix is screen-aligned it would convert the clip entry to
a window clip. Instead of doing this cogl-clip-stack.c now contains
the detection and keeps the entry as a rectangle clip but marks that
it is entirely described by its scissor rect. When flusing the clip
stack it doesn't do anything extra for entries that have this mark
(because the clip will already been setup by the scissor). This is
needed so that we can still track the original rectangle coordinates
and modelview matrix to help detect when it would be faster to modify
the rectangle when adding it to the journal rather than having to
break up the batch to set the clip state.
This commit is contained in:
Neil Roberts 2010-11-09 12:01:04 +00:00 committed by Robert Bragg
parent b14c2f799c
commit 07e49d5257
2 changed files with 83 additions and 81 deletions
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109
cogl/cogl-clip-stack.c
View file

@ -122,6 +122,16 @@ struct _CoglClipStackRect
float x1;
float y1;
/* If this is true then the clip for this rectangle is entirely
described by the scissor bounds. This implies that the rectangle
is screen aligned and we don't need to use the stencil buffer to
set the clip. We keep the entry as a rect entry rather than a
window rect entry so that it will be easier to detect if the
modelview matrix is that same as when a rectangle is added to the
journal. In that case we can use the original clip coordinates
and modify the rectangle instead. */
gboolean can_be_scissor;
/* The matrix that was current when the clip was set */
CoglMatrix matrix;
};
@ -470,6 +480,8 @@ _cogl_clip_stack_push_rectangle (CoglClipStack *stack,
const CoglMatrix *modelview_matrix)
{
CoglClipStackRect *entry;
CoglMatrix matrix_p;
float v[4];
/* Make a new entry */
entry = _cogl_clip_stack_push_entry (stack,
@ -483,8 +495,48 @@ _cogl_clip_stack_push_rectangle (CoglClipStack *stack,
entry->matrix = *modelview_matrix;
_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
x_1, y_1, x_2, y_2, modelview_matrix);
/* If the modelview meets these constraints then a transformed rectangle
* should still be a rectangle when it reaches screen coordinates.
*
* FIXME: we are are making certain assumptions about the projection
* matrix a.t.m and should really be looking at the combined modelview
* and projection matrix.
* FIXME: we don't consider rotations that are a multiple of 90 degrees
* which could be quite common.
*/
if (modelview_matrix->xy != 0 || modelview_matrix->xz != 0 ||
modelview_matrix->yx != 0 || modelview_matrix->yz != 0 ||
modelview_matrix->zx != 0 || modelview_matrix->zy != 0)
{
entry->can_be_scissor = FALSE;
_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
x_1, y_1, x_2, y_2, modelview_matrix);
}
else
{
CoglClipStack *base_entry = (CoglClipStack *) entry;
cogl_get_projection_matrix (&matrix_p);
cogl_get_viewport (v);
_cogl_transform_point (modelview_matrix, &matrix_p, v, &x_1, &y_1);
_cogl_transform_point (modelview_matrix, &matrix_p, v, &x_2, &y_2);
/* Consider that the modelview matrix may flip the rectangle
* along the x or y axis... */
#define SWAP(A,B) do { float tmp = B; B = A; A = tmp; } while (0)
if (x_1 > x_2)
SWAP (x_1, x_2);
if (y_1 > y_2)
SWAP (y_1, y_2);
#undef SWAP
base_entry->bounds_x0 = COGL_UTIL_NEARBYINT (x_1);
base_entry->bounds_y0 = COGL_UTIL_NEARBYINT (y_1);
base_entry->bounds_x1 = COGL_UTIL_NEARBYINT (x_2);
base_entry->bounds_y1 = COGL_UTIL_NEARBYINT (y_2);
entry->can_be_scissor = TRUE;
}
return (CoglClipStack *) entry;
}
@ -696,32 +748,37 @@ _cogl_clip_stack_flush (CoglClipStack *stack)
{
CoglClipStackRect *rect = (CoglClipStackRect *) entry;
_cogl_matrix_stack_push (modelview_stack);
_cogl_matrix_stack_set (modelview_stack, &rect->matrix);
/* If we support clip planes and we haven't already used
them then use that instead */
if (has_clip_planes)
/* We don't need to do anything extra if the clip for this
rectangle was entirely described by its scissor bounds */
if (!rect->can_be_scissor)
{
set_clip_planes (rect->x0,
rect->y0,
rect->x1,
rect->y1);
using_clip_planes = TRUE;
/* We can't use clip planes a second time */
has_clip_planes = FALSE;
}
else
{
add_stencil_clip_rectangle (rect->x0,
rect->y0,
rect->x1,
rect->y1,
!using_stencil_buffer);
using_stencil_buffer = TRUE;
}
_cogl_matrix_stack_push (modelview_stack);
_cogl_matrix_stack_set (modelview_stack, &rect->matrix);
_cogl_matrix_stack_pop (modelview_stack);
/* If we support clip planes and we haven't already used
them then use that instead */
if (has_clip_planes)
{
set_clip_planes (rect->x0,
rect->y0,
rect->x1,
rect->y1);
using_clip_planes = TRUE;
/* We can't use clip planes a second time */
has_clip_planes = FALSE;
}
else
{
add_stencil_clip_rectangle (rect->x0,
rect->y0,
rect->x1,
rect->y1,
!using_stencil_buffer);
using_stencil_buffer = TRUE;
}
_cogl_matrix_stack_pop (modelview_stack);
}
}
/* We don't need to do anything for window space rectangles
because their functionality is entirely implemented by the

55
cogl/cogl-clip-state.c
View file

@ -70,56 +70,6 @@ cogl_clip_push_window_rect (float x_offset,
cogl_clip_push_window_rectangle (x_offset, y_offset, width, height);
}
/* Try to push a rectangle given in object coordinates as a rectangle in window
* coordinates instead of object coordinates */
static gboolean
try_pushing_rect_as_window_rect (float x_1,
float y_1,
float x_2,
float y_2)
{
CoglMatrix matrix;
CoglMatrix matrix_p;
float v[4];
cogl_get_modelview_matrix (&matrix);
/* If the modelview meets these constraints then a transformed rectangle
* should still be a rectangle when it reaches screen coordinates.
*
* FIXME: we are are making certain assumptions about the projection
* matrix a.t.m and should really be looking at the combined modelview
* and projection matrix.
* FIXME: we don't consider rotations that are a multiple of 90 degrees
* which could be quite common.
*/
if (matrix.xy != 0 || matrix.xz != 0 ||
matrix.yx != 0 || matrix.yz != 0 ||
matrix.zx != 0 || matrix.zy != 0)
return FALSE;
cogl_get_projection_matrix (&matrix_p);
cogl_get_viewport (v);
_cogl_transform_point (&matrix, &matrix_p, v, &x_1, &y_1);
_cogl_transform_point (&matrix, &matrix_p, v, &x_2, &y_2);
/* Consider that the modelview matrix may flip the rectangle
* along the x or y axis... */
#define SWAP(A,B) do { float tmp = B; B = A; A = tmp; } while (0)
if (x_1 > x_2)
SWAP (x_1, x_2);
if (y_1 > y_2)
SWAP (y_1, y_2);
#undef SWAP
cogl_clip_push_window_rectangle (COGL_UTIL_NEARBYINT (x_1),
COGL_UTIL_NEARBYINT (y_1),
COGL_UTIL_NEARBYINT (x_2 - x_1),
COGL_UTIL_NEARBYINT (y_2 - y_1));
return TRUE;
}
void
cogl_clip_push_rectangle (float x_1,
float y_1,
@ -132,11 +82,6 @@ cogl_clip_push_rectangle (float x_1,
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Try and catch window space rectangles so we can redirect to
* cogl_clip_push_window_rect which will use scissoring. */
if (try_pushing_rect_as_window_rect (x_1, y_1, x_2, y_2))
return;
framebuffer = _cogl_get_framebuffer ();
clip_state = _cogl_framebuffer_get_clip_state (framebuffer);