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It's now possible to add arrays of indices to a Cogl vertex buffer and they will be put into an OpenGL vertex buffer object. Since it's quite common for index arrays to be static it saves the OpenGL driver from having to validate them repeatedly. This changes the cogl_vertex_buffer_draw_elements API: It's no longer possible to provide a pointer to an index array at draw time. So cogl_vertex_buffer_draw_elements now takes an indices identifier that should correspond to an idendifier returned when calling cogl_vertex_buffer_add_indices ()
169 lines
5.7 KiB
C
169 lines
5.7 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) 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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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifndef __COGL_VERTEX_BUFFER_H
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#define __COGL_VERTEX_BUFFER_H
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#include "cogl-handle.h"
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#include <glib.h>
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/* Note we put quite a bit into the flags here to help keep
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* the down size of the CoglVertexBufferAttrib struct below. */
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typedef enum _CoglVertexBufferAttribFlags
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{
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/* Types */
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/* NB: update the _TYPE_MASK below if these are changed */
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_COLOR_ARRAY = 1<<0,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_NORMAL_ARRAY = 1<<1,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_TEXTURE_COORD_ARRAY = 1<<2,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_VERTEX_ARRAY = 1<<3,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_CUSTOM_ARRAY = 1<<4,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_INVALID = 1<<5,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_NORMALIZED = 1<<6,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_ENABLED = 1<<7,
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/* Usage hints */
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/* FIXME - flatten into one flag, since its used as a boolean */
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_INFREQUENT_RESUBMIT = 1<<8,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_FREQUENT_RESUBMIT = 1<<9,
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/* GL Data types */
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/* NB: Update the _GL_TYPE_MASK below if these are changed */
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_BYTE = 1<<10,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_BYTE = 1<<11,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_SHORT = 1<<12,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_SHORT = 1<<13,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_INT = 1<<14,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_INT = 1<<15,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_FLOAT = 1<<16,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_DOUBLE = 1<<17,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_SUBMITTED = 1<<18,
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COGL_VERTEX_BUFFER_ATTRIB_FLAG_UNUSED = 1<<19
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/* XXX NB: If we need > 24 bits then look at changing the layout
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* of struct _CoglVertexBufferAttrib below */
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} CoglVertexBufferAttribFlags;
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#define COGL_VERTEX_BUFFER_ATTRIB_FLAG_TYPE_MASK \
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(COGL_VERTEX_BUFFER_ATTRIB_FLAG_COLOR_ARRAY \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_NORMAL_ARRAY \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_TEXTURE_COORD_ARRAY \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_VERTEX_ARRAY \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_CUSTOM_ARRAY \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_INVALID)
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#define COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_MASK \
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(COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_BYTE \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_BYTE \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_SHORT \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_SHORT \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_INT \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_UNSIGNED_INT \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_FLOAT \
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| COGL_VERTEX_BUFFER_ATTRIB_FLAG_GL_TYPE_DOUBLE)
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typedef struct _CoglVertexBufferAttrib
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{
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/* TODO: look at breaking up the flags into seperate
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* bitfields and seperate enums */
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CoglVertexBufferAttribFlags flags:24;
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guint8 id;
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GQuark name;
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union _u
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{
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const void *pointer;
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size_t vbo_offset;
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} u;
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size_t span_bytes;
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guint16 stride;
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guint8 n_components;
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guint8 texture_unit;
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} CoglVertexBufferAttrib;
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typedef enum _CoglVertexBufferVBOFlags
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{
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COGL_VERTEX_BUFFER_VBO_FLAG_UNSTRIDED = 1<<0,
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COGL_VERTEX_BUFFER_VBO_FLAG_STRIDED = 1<<1,
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COGL_VERTEX_BUFFER_VBO_FLAG_MULTIPACK = 1<<2,
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/* FIXME - flatten into one flag, since its used as a boolean */
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COGL_VERTEX_BUFFER_VBO_FLAG_INFREQUENT_RESUBMIT = 1<<3,
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COGL_VERTEX_BUFFER_VBO_FLAG_FREQUENT_RESUBMIT = 1<<4,
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COGL_VERTEX_BUFFER_VBO_FLAG_SUBMITTED = 1<<5
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} CoglVertexBufferVBOFlags;
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/*
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* A CoglVertexBufferVBO represents one or more attributes in a single
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* buffer object
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*/
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typedef struct _CoglVertexBufferVBO
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{
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CoglVertexBufferVBOFlags flags;
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/* Note: this is a pointer to handle fallbacks. It normally holds
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* a GLuint VBO name, but when the driver doesn't support VBOs then
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* this simply points to an malloc'd buffer. */
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void *vbo_name; /*!< The name of the corresponding buffer object */
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size_t vbo_bytes; /*!< The lengh of the allocated buffer object in bytes */
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GList *attributes;
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} CoglVertexBufferVBO;
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typedef struct _CoglVertexBufferIndices
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{
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int id;
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/* Note: this is a pointer to handle fallbacks. It normally holds
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* a GLuint VBO name, but when the driver doesn't support VBOs then
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* this simply points to an malloc'd buffer. */
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void *vbo_name;
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GLenum type;
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GLuint min_index;
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GLuint max_index;
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} CoglVertexBufferIndices;
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typedef struct _CoglVertexBuffer
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{
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CoglHandleObject _parent;
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int n_vertices; /*!< The number of vertices in the buffer */
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GList *submitted_vbos; /* The VBOs currently submitted to the GPU */
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/* Note: new_attributes is normally NULL and only valid while
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* modifying a buffer. */
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GList *new_attributes; /*!< attributes pending submission */
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GList *indices; /*!< A list of associated index arrays */
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} CoglVertexBuffer;
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#endif /* __COGL_VERTEX_BUFFER_H */
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