104961de6a
Sometimes it would be useful if we could efficiently track when a matrix stack has been modified. For example on GLES2 we have to upload the modelview as a uniform to our glsl programs but because the modelview state is part of the framebuffer state it becomes a bit more tricky to know when to re-sync the value of the uniform with the framebuffer state. This adds an "age" counter to CoglMatrixStack which is incremented for any operation that effectively modifies the top of the stack so now we can save the age of the stack inside the pipeline whenever we update modelview uniform and later compare that with the stack to determine if it has changed.
92 lines
4.7 KiB
C
92 lines
4.7 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 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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* Authors:
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* Havoc Pennington <hp@pobox.com> for litl
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*/
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#ifndef __COGL_MATRIX_STACK_H
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#define __COGL_MATRIX_STACK_H
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#include "cogl-matrix.h"
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typedef struct _CoglMatrixStack CoglMatrixStack;
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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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CoglMatrixStack* _cogl_matrix_stack_new (void);
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void _cogl_matrix_stack_destroy (CoglMatrixStack *stack);
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void _cogl_matrix_stack_push (CoglMatrixStack *stack);
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void _cogl_matrix_stack_pop (CoglMatrixStack *stack);
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void _cogl_matrix_stack_load_identity (CoglMatrixStack *stack);
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void _cogl_matrix_stack_scale (CoglMatrixStack *stack,
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float x,
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float y,
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float z);
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void _cogl_matrix_stack_translate (CoglMatrixStack *stack,
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float x,
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float y,
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float z);
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void _cogl_matrix_stack_rotate (CoglMatrixStack *stack,
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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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void _cogl_matrix_stack_multiply (CoglMatrixStack *stack,
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const CoglMatrix *matrix);
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void _cogl_matrix_stack_frustum (CoglMatrixStack *stack,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_far);
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void _cogl_matrix_stack_perspective (CoglMatrixStack *stack,
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float fov_y,
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float aspect,
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float z_near,
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float z_far);
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void _cogl_matrix_stack_ortho (CoglMatrixStack *stack,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_far);
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gboolean _cogl_matrix_stack_get_inverse (CoglMatrixStack *stack,
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CoglMatrix *inverse);
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void _cogl_matrix_stack_get (CoglMatrixStack *stack,
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CoglMatrix *matrix);
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void _cogl_matrix_stack_set (CoglMatrixStack *stack,
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const CoglMatrix *matrix);
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void _cogl_matrix_stack_flush_to_gl (CoglMatrixStack *stack,
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CoglMatrixMode mode);
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void _cogl_matrix_stack_dirty (CoglMatrixStack *stack);
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unsigned int _cogl_matrix_stack_get_age (CoglMatrixStack *stack);
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#endif /* __COGL_MATRIX_STACK_H */
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