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cab4622eb3
We have found several times now when writing code using Cogl that it would really help if Cogl's matrix stack api was public as a utility api. In Rig for example we want to avoid redundant arithmetic when deriving the matrices of entities used to render and we aren't able to simply use the framebuffer's matrix stack to achieve this. Also when implementing cairo-cogl we found that it would be really useful if we could have a matrix stack utility api. (cherry picked from commit d17a01fd935d88fab96fe6cc0b906c84026c0067)
195 lines
4.3 KiB
C
195 lines
4.3 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) 2009,2010,2012 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
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Havoc Pennington <hp@pobox.com> for litl
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifndef _COGL_MATRIX_STACK_PRIVATE_H_
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#define _COGL_MATRIX_STACK_PRIVATE_H_
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#include "cogl-object-private.h"
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#include "cogl-matrix-stack.h"
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#include "cogl-context.h"
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#include "cogl-framebuffer.h"
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typedef enum _CoglMatrixOp
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{
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COGL_MATRIX_OP_LOAD_IDENTITY,
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COGL_MATRIX_OP_TRANSLATE,
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COGL_MATRIX_OP_ROTATE,
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COGL_MATRIX_OP_ROTATE_QUATERNION,
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COGL_MATRIX_OP_ROTATE_EULER,
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COGL_MATRIX_OP_SCALE,
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COGL_MATRIX_OP_MULTIPLY,
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COGL_MATRIX_OP_LOAD,
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COGL_MATRIX_OP_SAVE,
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} CoglMatrixOp;
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struct _CoglMatrixEntry
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{
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CoglMatrixEntry *parent;
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CoglMatrixOp op;
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unsigned int ref_count;
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#ifdef COGL_DEBUG_ENABLED
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/* used for performance tracing */
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int composite_gets;
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#endif
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};
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typedef struct _CoglMatrixEntryTranslate
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{
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CoglMatrixEntry _parent_data;
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float x;
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float y;
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float z;
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} CoglMatrixEntryTranslate;
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typedef struct _CoglMatrixEntryRotate
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{
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CoglMatrixEntry _parent_data;
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float angle;
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float x;
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float y;
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float z;
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} CoglMatrixEntryRotate;
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typedef struct _CoglMatrixEntryRotateEuler
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{
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CoglMatrixEntry _parent_data;
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/* This doesn't store an actual CoglEuler in order to avoid the
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* padding */
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float heading;
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float pitch;
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float roll;
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} CoglMatrixEntryRotateEuler;
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typedef struct _CoglMatrixEntryRotateQuaternion
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{
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CoglMatrixEntry _parent_data;
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/* This doesn't store an actual CoglQuaternion in order to avoid the
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* padding */
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float values[4];
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} CoglMatrixEntryRotateQuaternion;
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typedef struct _CoglMatrixEntryScale
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{
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CoglMatrixEntry _parent_data;
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float x;
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float y;
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float z;
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} CoglMatrixEntryScale;
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typedef struct _CoglMatrixEntryMultiply
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{
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CoglMatrixEntry _parent_data;
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CoglMatrix *matrix;
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} CoglMatrixEntryMultiply;
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typedef struct _CoglMatrixEntryLoad
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{
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CoglMatrixEntry _parent_data;
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CoglMatrix *matrix;
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} CoglMatrixEntryLoad;
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typedef struct _CoglMatrixEntrySave
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{
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CoglMatrixEntry _parent_data;
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CoglBool cache_valid;
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CoglMatrix *cache;
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} CoglMatrixEntrySave;
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typedef union _CoglMatrixEntryFull
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{
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CoglMatrixEntry any;
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CoglMatrixEntryTranslate translate;
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CoglMatrixEntryRotate rotate;
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CoglMatrixEntryRotateEuler rotate_euler;
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CoglMatrixEntryRotateQuaternion rotate_quaternion;
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CoglMatrixEntryScale scale;
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CoglMatrixEntryMultiply multiply;
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CoglMatrixEntryLoad load;
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CoglMatrixEntrySave save;
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} CoglMatrixEntryFull;
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struct _CoglMatrixStack
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{
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CoglObject _parent;
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CoglContext *context;
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CoglMatrixEntry *last_entry;
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};
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typedef struct _CoglMatrixEntryCache
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{
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CoglMatrixEntry *entry;
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CoglBool flushed_identity;
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CoglBool flipped;
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} CoglMatrixEntryCache;
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void
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_cogl_matrix_entry_identity_init (CoglMatrixEntry *entry);
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typedef enum {
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COGL_MATRIX_MODELVIEW,
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COGL_MATRIX_PROJECTION,
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COGL_MATRIX_TEXTURE
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} CoglMatrixMode;
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void
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_cogl_matrix_entry_flush_to_gl_builtins (CoglContext *ctx,
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CoglMatrixEntry *entry,
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CoglMatrixMode mode,
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CoglFramebuffer *framebuffer,
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CoglBool disable_flip);
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void
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_cogl_matrix_entry_cache_init (CoglMatrixEntryCache *cache);
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CoglBool
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_cogl_matrix_entry_cache_maybe_update (CoglMatrixEntryCache *cache,
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CoglMatrixEntry *entry,
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CoglBool flip);
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void
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_cogl_matrix_entry_cache_destroy (CoglMatrixEntryCache *cache);
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#endif /* _COGL_MATRIX_STACK_PRIVATE_H_ */
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