3a041ef41b
This tweaks the ordering of some struct members in some of the more important structs so that the compiler won't insert wasted padding to avoid breaking the alignment. Some members that were previously unsigned long have been changed to unsigned int. These members need to be able to fit in 32-bits to run on 32-bit machines anyway so there's no point in having them extend to 64-bit on 64-bit machines. This doesn't affect the public API. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit b721af236680005464e39f7f4dd11381d95efb16)
227 lines
7.3 KiB
C
227 lines
7.3 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
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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, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_CLIP_STACK_H
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#define __COGL_CLIP_STACK_H
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#include "cogl2-path.h"
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#include "cogl-matrix.h"
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#include "cogl-primitive.h"
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#include "cogl-framebuffer.h"
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#include "cogl-matrix-stack.h"
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/* The clip stack works like a GSList where only a pointer to the top
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of the stack is stored. The empty clip stack is represented simply
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by the NULL pointer. When an entry is added to or removed from the
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stack the new top of the stack is returned. When an entry is pushed
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a new clip stack entry is created which effectively takes ownership
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of the reference on the old entry. Therefore unrefing the top entry
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effectively loses ownership of all entries in the stack */
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typedef struct _CoglClipStack CoglClipStack;
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typedef struct _CoglClipStackRect CoglClipStackRect;
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typedef struct _CoglClipStackWindowRect CoglClipStackWindowRect;
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typedef struct _CoglClipStackPath CoglClipStackPath;
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typedef struct _CoglClipStackPrimitive CoglClipStackPrimitive;
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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_WINDOW_RECT,
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COGL_CLIP_STACK_PATH,
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COGL_CLIP_STACK_PRIMITIVE
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} CoglClipStackType;
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/* A clip stack consists a list of entries. Each entry has a reference
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* count and a link to its parent node. The child takes a reference on
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* the parent and the CoglClipStack holds a reference to the top of
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* the stack. There are no links back from the parent to the
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* children. This allows stacks that have common ancestry to share the
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* entries.
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*
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* For example, the following sequence of operations would generate
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* the tree below:
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*
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* CoglClipStack *stack_a = NULL;
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* stack_a = _cogl_clip_stack_push_rectangle (stack_a, ...);
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* stack_a = _cogl_clip_stack_push_rectangle (stack_a, ...);
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* stack_a = _cogl_clip_stack_push_from_path (stack_a, ...);
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* CoglClipStack *stack_b = NULL;
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* stack_b = cogl_clip_stack_push_window_rectangle (stack_b, ...);
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*
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* stack_a
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* \ holds a ref to
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* +-----------+
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* | path node |
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* |ref count 1|
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* +-----------+
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* \
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* +-----------+ +-----------+
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* both tops hold | rect node | | rect node |
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* a ref to the |ref count 2|--|ref count 1|
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* same rect node +-----------+ +-----------+
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* /
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* +-----------+
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* | win. rect |
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* |ref count 1|
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* +-----------+
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* / holds a ref to
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* stack_b
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*
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*/
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struct _CoglClipStack
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{
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/* This will be null if there is no parent. If it is not null then
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this node must be holding a reference to the parent */
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CoglClipStack *parent;
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CoglClipStackType type;
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/* All clip entries have a window-space bounding box which we can
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use to calculate a scissor. The scissor limits the clip so that
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we don't need to do a full stencil clear if the stencil buffer is
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needed. This is stored in Cogl's coordinate space (ie, 0,0 is the
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top left) */
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int bounds_x0;
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int bounds_y0;
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int bounds_x1;
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int bounds_y1;
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unsigned int ref_count;
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};
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struct _CoglClipStackRect
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{
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CoglClipStack _parent_data;
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/* The rectangle for this clip */
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float x0;
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float y0;
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float x1;
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float y1;
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/* The matrix that was current when the clip was set */
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CoglMatrixEntry *matrix_entry;
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/* If this is true then the clip for this rectangle is entirely
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described by the scissor bounds. This implies that the rectangle
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is screen aligned and we don't need to use the stencil buffer to
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set the clip. We keep the entry as a rect entry rather than a
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window rect entry so that it will be easier to detect if the
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modelview matrix is that same as when a rectangle is added to the
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journal. In that case we can use the original clip coordinates
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and modify the rectangle instead. */
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CoglBool can_be_scissor;
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};
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struct _CoglClipStackWindowRect
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{
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CoglClipStack _parent_data;
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/* The window rect clip doesn't need any specific data because it
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just adds to the scissor clip */
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};
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struct _CoglClipStackPath
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{
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CoglClipStack _parent_data;
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/* The matrix that was current when the clip was set */
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CoglMatrixEntry *matrix_entry;
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CoglPath *path;
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};
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struct _CoglClipStackPrimitive
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{
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CoglClipStack _parent_data;
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/* The matrix that was current when the clip was set */
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CoglMatrixEntry *matrix_entry;
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CoglPrimitive *primitive;
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float bounds_x1;
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float bounds_y1;
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float bounds_x2;
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float bounds_y2;
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};
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CoglClipStack *
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_cogl_clip_stack_push_window_rectangle (CoglClipStack *stack,
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int x_offset,
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int y_offset,
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int width,
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int height);
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CoglClipStack *
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_cogl_clip_stack_push_rectangle (CoglClipStack *stack,
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float x_1,
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float y_1,
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float x_2,
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float y_2,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport);
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CoglClipStack *
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_cogl_clip_stack_push_from_path (CoglClipStack *stack,
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CoglPath *path,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport);
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CoglClipStack *
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_cogl_clip_stack_push_primitive (CoglClipStack *stack,
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CoglPrimitive *primitive,
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float bounds_x1,
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float bounds_y1,
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float bounds_x2,
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float bounds_y2,
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CoglMatrixEntry *modelview_entry,
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CoglMatrixEntry *projection_entry,
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const float *viewport);
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CoglClipStack *
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_cogl_clip_stack_pop (CoglClipStack *stack);
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void
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_cogl_clip_stack_get_bounds (CoglClipStack *stack,
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int *scissor_x0,
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int *scissor_y0,
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int *scissor_x1,
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int *scissor_y1);
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void
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_cogl_clip_stack_flush (CoglClipStack *stack,
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CoglFramebuffer *framebuffer);
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CoglClipStack *
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_cogl_clip_stack_ref (CoglClipStack *stack);
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void
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_cogl_clip_stack_unref (CoglClipStack *stack);
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#endif /* __COGL_CLIP_STACK_H */
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