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142 lines
4.1 KiB
C
142 lines
4.1 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 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, 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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#ifndef __COGL_TEXTURE_H
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#define __COGL_TEXTURE_H
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#include "cogl-bitmap-private.h"
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#include "cogl-handle.h"
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typedef struct _CoglTexture CoglTexture;
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typedef struct _CoglTexSliceSpan CoglTexSliceSpan;
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typedef struct _CoglSpanIter CoglSpanIter;
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typedef struct _CoglTexturePixel CoglTexturePixel;
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struct _CoglTexSliceSpan
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{
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gint start;
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gint size;
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gint waste;
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};
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struct _CoglSpanIter
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{
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gint index;
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GArray *array;
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CoglTexSliceSpan *span;
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float pos;
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float next_pos;
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float origin;
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float cover_start;
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float cover_end;
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float intersect_start;
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float intersect_end;
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float intersect_start_local;
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float intersect_end_local;
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gboolean intersects;
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};
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/* This is used to store the first pixel of each slice. This is only
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used when glGenerateMipmap is not available */
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struct _CoglTexturePixel
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{
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/* We need to store the format of the pixel because we store the
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data in the source format which might end up being different for
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each slice if a subregion is updated with a different format */
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GLenum gl_format;
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GLenum gl_type;
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guint8 data[4];
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};
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struct _CoglTexture
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{
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CoglHandleObject _parent;
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CoglBitmap bitmap;
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gboolean bitmap_owner;
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GLenum gl_target;
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GLenum gl_intformat;
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GLenum gl_format;
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GLenum gl_type;
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GArray *slice_x_spans;
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GArray *slice_y_spans;
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GArray *slice_gl_handles;
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gint max_waste;
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GLenum min_filter;
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GLenum mag_filter;
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gboolean is_foreign;
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GLint wrap_mode;
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gboolean auto_mipmap;
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gboolean mipmaps_dirty;
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/* This holds a copy of the first pixel in each slice. It is only
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used to force an automatic update of the mipmaps when
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glGenerateMipmap is not available. */
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CoglTexturePixel *first_pixels;
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};
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/* To improve batching of geometry when submitting vertices to OpenGL we
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* log the texture rectangles we want to draw to a journal, so when we
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* later flush the journal we aim to batch data, and gl draw calls. */
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typedef struct _CoglJournalEntry
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{
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CoglHandle material;
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gint n_layers;
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guint32 fallback_mask;
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GLuint layer0_override_texture;
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} CoglJournalEntry;
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CoglTexture*
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_cogl_texture_pointer_from_handle (CoglHandle handle);
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void
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_cogl_texture_set_wrap_mode_parameter (CoglTexture *tex,
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GLenum wrap_mode);
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void
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_cogl_texture_set_filters (CoglHandle handle,
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GLenum min_filter,
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GLenum mag_filter);
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void
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_cogl_texture_ensure_mipmaps (CoglHandle handle);
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gboolean
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_cogl_texture_span_has_waste (CoglTexture *tex,
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gint x_span_index,
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gint y_span_index);
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void
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_cogl_span_iter_begin (CoglSpanIter *iter,
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GArray *array,
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float origin,
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float cover_start,
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float cover_end);
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gboolean
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_cogl_span_iter_end (CoglSpanIter *iter);
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void
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_cogl_span_iter_next (CoglSpanIter *iter);
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#endif /* __COGL_TEXTURE_H */
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