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e91fe8817d
Since the CoglMatrix type was added for supporting texture matrices recently it made sense to be consistent accross the Cogl API and use the Cogl type over the GL style GLfloat m[16] arrays.
353 lines
8.9 KiB
C
353 lines
8.9 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2008 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "cogl.h"
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#include "cogl-clip-stack.h"
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#include "cogl-primitives.h"
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#include "cogl-context.h"
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/* These are defined in the particular backend (float in GL vs fixed
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in GL ES) */
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void _cogl_set_clip_planes (float x,
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float y,
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float width,
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float height);
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void _cogl_add_stencil_clip (float x,
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float y,
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float width,
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float height,
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gboolean first);
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void _cogl_add_path_to_stencil_buffer (floatVec2 nodes_min,
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floatVec2 nodes_max,
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guint path_size,
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CoglPathNode *path,
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gboolean merge);
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void _cogl_enable_clip_planes (void);
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void _cogl_disable_clip_planes (void);
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void _cogl_disable_stencil_buffer (void);
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void _cogl_set_matrix (const CoglMatrix *matrix);
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typedef struct _CoglClipStack CoglClipStack;
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typedef struct _CoglClipStackEntryRect CoglClipStackEntryRect;
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typedef struct _CoglClipStackEntryPath CoglClipStackEntryPath;
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typedef enum
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{
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COGL_CLIP_STACK_RECT,
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COGL_CLIP_STACK_PATH
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} CoglClipStackEntryType;
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struct _CoglClipStack
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{
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GList *stack_top;
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};
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struct _CoglClipStackEntryRect
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{
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CoglClipStackEntryType type;
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/* The rectangle for this clip */
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float x_offset;
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float y_offset;
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float width;
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float height;
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/* The matrix that was current when the clip was set */
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CoglMatrix matrix;
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};
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struct _CoglClipStackEntryPath
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{
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CoglClipStackEntryType type;
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/* The matrix that was current when the clip was set */
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CoglMatrix matrix;
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floatVec2 path_nodes_min;
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floatVec2 path_nodes_max;
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guint path_size;
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CoglPathNode path[1];
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};
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void
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cogl_clip_push (float x_offset,
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float y_offset,
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float width,
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float height)
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{
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CoglClipStackEntryRect *entry;
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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stack = (CoglClipStack *) ctx->clip.stacks->data;
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entry = g_slice_new (CoglClipStackEntryRect);
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/* Make a new entry */
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entry->type = COGL_CLIP_STACK_RECT;
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entry->x_offset = x_offset;
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entry->y_offset = y_offset;
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entry->width = width;
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entry->height = height;
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cogl_get_modelview_matrix (&entry->matrix);
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/* Store it in the stack */
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stack->stack_top = g_list_prepend (stack->stack_top, entry);
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ctx->clip.stack_dirty = TRUE;
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}
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void
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cogl_clip_push_from_path_preserve (void)
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{
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CoglClipStackEntryPath *entry;
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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stack = (CoglClipStack *) ctx->clip.stacks->data;
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entry = g_malloc (sizeof (CoglClipStackEntryPath)
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+ sizeof (CoglPathNode) * (ctx->path_nodes->len - 1));
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entry->type = COGL_CLIP_STACK_PATH;
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entry->path_nodes_min = ctx->path_nodes_min;
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entry->path_nodes_max = ctx->path_nodes_max;
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entry->path_size = ctx->path_nodes->len;
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memcpy (entry->path, ctx->path_nodes->data,
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sizeof (CoglPathNode) * ctx->path_nodes->len);
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cogl_get_modelview_matrix (&entry->matrix);
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/* Store it in the stack */
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stack->stack_top = g_list_prepend (stack->stack_top, entry);
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ctx->clip.stack_dirty = TRUE;
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}
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void
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cogl_clip_push_from_path (void)
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{
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cogl_clip_push_from_path_preserve ();
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cogl_path_new ();
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}
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void
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cogl_clip_pop (void)
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{
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gpointer entry;
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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stack = (CoglClipStack *) ctx->clip.stacks->data;
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g_return_if_fail (stack->stack_top != NULL);
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entry = stack->stack_top->data;
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/* Remove the top entry from the stack */
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if (*(CoglClipStackEntryType *) entry == COGL_CLIP_STACK_RECT)
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g_slice_free (CoglClipStackEntryRect, entry);
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else
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g_free (entry);
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stack->stack_top = g_list_delete_link (stack->stack_top,
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stack->stack_top);
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ctx->clip.stack_dirty = TRUE;
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}
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void
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_cogl_clip_stack_rebuild (void)
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{
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int has_clip_planes = cogl_features_available (COGL_FEATURE_FOUR_CLIP_PLANES);
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gboolean using_clip_planes = FALSE;
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gboolean using_stencil_buffer = FALSE;
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GList *node;
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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stack = (CoglClipStack *) ctx->clip.stacks->data;
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ctx->clip.stack_dirty = FALSE;
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ctx->clip.stencil_used = FALSE;
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_cogl_disable_clip_planes ();
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_cogl_disable_stencil_buffer ();
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/* If the stack is empty then there's nothing else to do */
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if (stack->stack_top == NULL)
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return;
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/* Find the bottom of the stack */
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for (node = stack->stack_top; node->next; node = node->next);
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/* Re-add every entry from the bottom of the stack up */
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for (; node; node = node->prev)
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{
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gpointer entry = node->data;
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if (*(CoglClipStackEntryType *) entry == COGL_CLIP_STACK_PATH)
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{
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CoglClipStackEntryPath *path = (CoglClipStackEntryPath *) entry;
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cogl_push_matrix ();
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_cogl_set_matrix (&path->matrix);
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_cogl_add_path_to_stencil_buffer (path->path_nodes_min,
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path->path_nodes_max,
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path->path_size,
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path->path,
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using_stencil_buffer);
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cogl_pop_matrix ();
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using_stencil_buffer = TRUE;
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/* We can't use clip planes any more */
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has_clip_planes = FALSE;
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}
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else
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{
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CoglClipStackEntryRect *rect = (CoglClipStackEntryRect *) entry;
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cogl_push_matrix ();
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_cogl_set_matrix (&rect->matrix);
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/* If this is the first entry and we support clip planes then use
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that instead */
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if (has_clip_planes)
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{
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_cogl_set_clip_planes (rect->x_offset,
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rect->y_offset,
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rect->width,
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rect->height);
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using_clip_planes = TRUE;
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/* We can't use clip planes a second time */
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has_clip_planes = FALSE;
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}
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else
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{
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_cogl_add_stencil_clip (rect->x_offset,
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rect->y_offset,
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rect->width,
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rect->height,
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!using_stencil_buffer);
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using_stencil_buffer = TRUE;
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}
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cogl_pop_matrix ();
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}
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}
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/* Enabling clip planes is delayed to now so that they won't affect
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setting up the stencil buffer */
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if (using_clip_planes)
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_cogl_enable_clip_planes ();
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ctx->clip.stencil_used = using_stencil_buffer;
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}
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void
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cogl_clip_ensure (void)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (ctx->clip.stack_dirty)
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_cogl_clip_stack_rebuild ();
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}
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void
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cogl_clip_stack_save (void)
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{
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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stack = g_slice_new (CoglClipStack);
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stack->stack_top = NULL;
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ctx->clip.stacks = g_slist_prepend (ctx->clip.stacks, stack);
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ctx->clip.stack_dirty = TRUE;
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}
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void
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cogl_clip_stack_restore (void)
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{
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CoglClipStack *stack;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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g_return_if_fail (ctx->clip.stacks != NULL);
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stack = (CoglClipStack *) ctx->clip.stacks->data;
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/* Empty the current stack */
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while (stack->stack_top)
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cogl_clip_pop ();
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/* Revert to an old stack */
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g_slice_free (CoglClipStack, stack);
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ctx->clip.stacks = g_slist_delete_link (ctx->clip.stacks,
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ctx->clip.stacks);
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ctx->clip.stack_dirty = TRUE;
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}
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void
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_cogl_clip_stack_state_init (void)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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ctx->clip.stacks = NULL;
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ctx->clip.stack_dirty = TRUE;
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/* Add an intial stack */
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cogl_clip_stack_save ();
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}
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void
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_cogl_clip_stack_state_destroy (void)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Destroy all of the stacks */
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while (ctx->clip.stacks)
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cogl_clip_stack_restore ();
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}
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