mutter/gles/cogl-primitives.c
Neil Roberts 7c69ca2997 Bug 918 - Group doesn't clip if it's children are clipped
* clutter/cogl/common/cogl-clip-stack.h: 
	* clutter/cogl/common/cogl-clip-stack.c: Added functions to
	maintain a stack of clipping rectangles.

	* clutter/cogl/gles/cogl.c: 
	* clutter/cogl/gl/cogl.c: The cogl_clip_set and unset functions
	have moved into cogl-clip-stack.c which calls back to cogl.c to
	set the actual rectangles. Multiple clip rectangles are combined
	by merging the stencil buffers.

	* clutter/cogl/gles/cogl-primitives.c (_cogl_path_fill_nodes): 
	* clutter/cogl/gl/cogl-primitives.c (_cogl_path_fill_nodes): Merge
	the stencil buffer with the contents of the clipping stack after
	drawing the path.

	* clutter/cogl/gles/cogl-context.h (CoglContext): 
	* clutter/cogl/gl/cogl-context.h (CoglContext): Store the number
	of available stencil bits.

	* clutter/cogl/common/Makefile.am
	(libclutter_cogl_common_la_SOURCES): Added cogl-clip-stack.c
2008-06-23 14:57:36 +00:00

367 lines
9.4 KiB
C

/*
* Clutter COGL
*
* A basic GL/GLES Abstraction/Utility Layer
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context.h"
#include "cogl-clip-stack.h"
#include <string.h>
#include <gmodule.h>
#define _COGL_MAX_BEZ_RECURSE_DEPTH 16
void
_cogl_rectangle (gint x,
gint y,
guint width,
guint height)
{
/* 32-bit integers are not supported as coord types
in GLES . Fixed type has got 16 bits left of the
point which is equal to short anyway. */
GLshort rect_verts[8] = {
(GLshort) x, (GLshort) y,
(GLshort) (x + width), (GLshort) y,
(GLshort) x, (GLshort) (y + height),
(GLshort) (x + width), (GLshort) (y + height)
};
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0));
GE ( cogl_wrap_glVertexPointer (2, GL_SHORT, 0, rect_verts ) );
GE ( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 4) );
}
void
_cogl_rectanglex (ClutterFixed x,
ClutterFixed y,
ClutterFixed width,
ClutterFixed height)
{
GLfixed rect_verts[8] = {
x, y,
x + width, y,
x, y + height,
x + width, y + height
};
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255
? COGL_ENABLE_BLEND : 0));
GE( cogl_wrap_glVertexPointer (2, GL_FIXED, 0, rect_verts) );
GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_STRIP, 0, 4) );
}
void
_cogl_path_clear_nodes ()
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->path_nodes)
g_free(ctx->path_nodes);
ctx->path_nodes = (CoglFixedVec2*) g_malloc (2 * sizeof(CoglFixedVec2));
ctx->path_nodes_size = 0;
ctx->path_nodes_cap = 2;
}
void
_cogl_path_add_node (ClutterFixed x,
ClutterFixed y)
{
CoglFixedVec2 *new_nodes = NULL;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->path_nodes_size == ctx->path_nodes_cap)
{
new_nodes = g_realloc (ctx->path_nodes,
2 * ctx->path_nodes_cap
* sizeof (CoglFixedVec2));
if (new_nodes == NULL) return;
ctx->path_nodes = new_nodes;
ctx->path_nodes_cap *= 2;
}
ctx->path_nodes [ctx->path_nodes_size].x = x;
ctx->path_nodes [ctx->path_nodes_size].y = y;
ctx->path_nodes_size++;
if (ctx->path_nodes_size == 1)
{
ctx->path_nodes_min.x = ctx->path_nodes_max.x = x;
ctx->path_nodes_min.y = ctx->path_nodes_max.y = y;
}
else
{
if (x < ctx->path_nodes_min.x) ctx->path_nodes_min.x = x;
if (x > ctx->path_nodes_max.x) ctx->path_nodes_max.x = x;
if (y < ctx->path_nodes_min.y) ctx->path_nodes_min.y = y;
if (y > ctx->path_nodes_max.y) ctx->path_nodes_max.y = y;
}
}
void
_cogl_path_stroke_nodes ()
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255
? COGL_ENABLE_BLEND : 0));
GE( cogl_wrap_glVertexPointer (2, GL_FIXED, 0, ctx->path_nodes) );
GE( cogl_wrap_glDrawArrays (GL_LINE_STRIP, 0, ctx->path_nodes_size) );
}
static gint compare_ints (gconstpointer a,
gconstpointer b)
{
return GPOINTER_TO_INT(a)-GPOINTER_TO_INT(b);
}
void
_cogl_path_fill_nodes ()
{
guint bounds_x;
guint bounds_y;
guint bounds_w;
guint bounds_h;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
bounds_x = CLUTTER_FIXED_FLOOR (ctx->path_nodes_min.x);
bounds_y = CLUTTER_FIXED_FLOOR (ctx->path_nodes_min.y);
bounds_w = CLUTTER_FIXED_CEIL (ctx->path_nodes_max.x - ctx->path_nodes_min.x);
bounds_h = CLUTTER_FIXED_CEIL (ctx->path_nodes_max.y - ctx->path_nodes_min.y);
if (cogl_features_available (COGL_FEATURE_STENCIL_BUFFER))
{
GE( glClear (GL_STENCIL_BUFFER_BIT) );
GE( cogl_wrap_glEnable (GL_STENCIL_TEST) );
GE( glStencilFunc (GL_NEVER, 0x0, 0x1) );
GE( glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT) );
GE( glStencilMask (1) );
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0));
GE( cogl_wrap_glVertexPointer (2, GL_FIXED, 0, ctx->path_nodes) );
GE( cogl_wrap_glDrawArrays (GL_TRIANGLE_FAN, 0, ctx->path_nodes_size) );
GE( glStencilMask (~(GLuint) 0) );
/* Merge the stencil buffer with any clipping rectangles */
_cogl_clip_stack_merge ();
GE( glStencilFunc (GL_EQUAL, 0x1, 0x1) );
GE( glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP) );
cogl_rectangle (bounds_x, bounds_y, bounds_w, bounds_h);
/* Rebuild the stencil clip */
_cogl_clip_stack_rebuild (TRUE);
}
else
{
/* This is our edge list it stores intersections between our
* curve and scanlines, it should probably be implemented with a
* data structure that has smaller overhead for inserting the
* curve/scanline intersections.
*/
GSList *scanlines[bounds_h];
gint i;
gint prev_x;
gint prev_y;
gint first_x;
gint first_y;
gint lastdir=-2; /* last direction we vere moving */
gint lastline=-1; /* the previous scanline we added to */
/* clear scanline intersection lists */
for (i=0; i < bounds_h; i++)
scanlines[i]=NULL;
first_x = prev_x = CLUTTER_FIXED_TO_INT (ctx->path_nodes[0].x);
first_y = prev_y = CLUTTER_FIXED_TO_INT (ctx->path_nodes[0].y);
/* create scanline intersection list */
for (i=1; i<ctx->path_nodes_size; i++)
{
gint dest_x = CLUTTER_FIXED_TO_INT (ctx->path_nodes[i].x);
gint dest_y = CLUTTER_FIXED_TO_INT (ctx->path_nodes[i].y);
gint ydir;
gint dx;
gint dy;
gint y;
fill_close:
dx = dest_x - prev_x;
dy = dest_y - prev_y;
if (dy < 0)
ydir = -1;
else if (dy > 0)
ydir = 1;
else
ydir = 0;
/* do linear interpolation between vertexes */
for (y=prev_y; y!= dest_y; y += ydir)
{
/* only add a point if the scanline has changed and we're
* within bounds.
*/
if (y-bounds_y >= 0 &&
y-bounds_y < bounds_h &&
lastline != y)
{
gint x = prev_x + (dx * (y-prev_y)) / dy;
scanlines[ y - bounds_y ]=
g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x),
compare_ints);
if (ydir != lastdir && /* add a double entry when changing */
lastdir!=-2) /* vertical direction */
scanlines[ y - bounds_y ]=
g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x),
compare_ints);
lastdir = ydir;
lastline = y;
}
}
prev_x = dest_x;
prev_y = dest_y;
/* if we're on the last knot, fake the first vertex being a
next one */
if (ctx->path_nodes_size == i+1)
{
dest_x = first_x;
dest_y = first_y;
i++; /* to make the loop finally end */
goto fill_close;
}
}
{
gint spans = 0;
gint span_no;
GLfixed *coords;
/* count number of spans */
for (i=0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
if (!next)
{
break;
}
/* draw the segments that should be visible */
spans ++;
iter = next->next;
}
}
coords = g_malloc0 (spans * sizeof (GLfixed) * 3 * 2 * 2);
span_no = 0;
/* build list of triangles */
for (i=0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
GLfixed x0, x1;
GLfixed y0, y1;
if (!next)
break;
x0 = CLUTTER_INT_TO_FIXED (GPOINTER_TO_INT (iter->data));
x1 = CLUTTER_INT_TO_FIXED (GPOINTER_TO_INT (next->data));
y0 = CLUTTER_INT_TO_FIXED (bounds_y + i);
y1 = CLUTTER_INT_TO_FIXED (bounds_y + i + 1) + 2048;
/* render scanlines 1.0625 high to avoid gaps when
transformed */
coords[span_no * 12 + 0] = x0;
coords[span_no * 12 + 1] = y0;
coords[span_no * 12 + 2] = x1;
coords[span_no * 12 + 3] = y0;
coords[span_no * 12 + 4] = x1;
coords[span_no * 12 + 5] = y1;
coords[span_no * 12 + 6] = x0;
coords[span_no * 12 + 7] = y0;
coords[span_no * 12 + 8] = x0;
coords[span_no * 12 + 9] = y1;
coords[span_no * 12 + 10] = x1;
coords[span_no * 12 + 11] = y1;
span_no ++;
iter = next->next;
}
}
for (i=0; i < bounds_h; i++)
{
g_slist_free (scanlines[i]);
}
/* render triangles */
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0));
GE ( cogl_wrap_glVertexPointer (2, GL_FIXED, 0, coords ) );
GE ( cogl_wrap_glDrawArrays (GL_TRIANGLES, 0, spans * 2 * 3));
g_free (coords);
}
}
}