58b0028b52
While this is totally fine (0 in the pointer context will be converted in the right internal NULL representation, which could be a value with some bits to 1), I believe it's clearer to use NULL in the pointer context. It seems that, in most case, it's more an overlook than a deliberate choice to use FALSE/0 as NULL, eg. copying a _COGL_GET_CONTEXT (ctx, 0) or a g_return_val_if_fail (cond, 0) from a function returning a gboolean.
273 lines
6.6 KiB
C
273 lines
6.6 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) 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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* Authors:
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* Damien Lespiau <damien.lespiau@intel.com>
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*/
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/* For an overview of the functionality implemented here, please see
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* cogl-buffer.h, which contains the gtk-doc section overview for the
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* Pixel Buffers API.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-pixel-buffer-private.h"
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/*
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* GL/GLES compatibility defines for the buffer API:
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*/
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#if defined (HAVE_COGL_GL)
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#define glGenBuffers ctx->drv.pf_glGenBuffers
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#define glBindBuffer ctx->drv.pf_glBindBuffer
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#define glBufferData ctx->drv.pf_glBufferData
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#define glBufferSubData ctx->drv.pf_glBufferSubData
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#define glGetBufferSubData ctx->drv.pf_glGetBufferSubData
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#define glDeleteBuffers ctx->drv.pf_glDeleteBuffers
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#define glMapBuffer ctx->drv.pf_glMapBuffer
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#define glUnmapBuffer ctx->drv.pf_glUnmapBuffer
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#define glActiveTexture ctx->drv.pf_glActiveTexture
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#define glClientActiveTexture ctx->drv.pf_glClientActiveTexture
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#ifndef GL_ARRAY_BUFFER
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#define GL_ARRAY_BUFFER GL_ARRAY_BUFFER_ARB
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#endif
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#elif defined (HAVE_COGL_GLES2)
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#include "../gles/cogl-gles2-wrapper.h"
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#endif
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void cogl_buffer_unmap_EXP (CoglBuffer *buffer);
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gboolean
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cogl_is_buffer_EXP (const void *object)
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{
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CoglObject *obj = (CoglObject *)object;
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if (obj == NULL)
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return FALSE;
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return obj->klass->type == _cogl_handle_pixel_buffer_get_type ();
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}
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void
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_cogl_buffer_initialize (CoglBuffer *buffer,
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unsigned int size,
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CoglBufferUsageHint usage_hint,
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CoglBufferUpdateHint update_hint)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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buffer->flags = COGL_BUFFER_FLAG_NONE;
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buffer->size = size;
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buffer->usage_hint = usage_hint;
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buffer->update_hint = update_hint;
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buffer->data = NULL;
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}
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void
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_cogl_buffer_fini (CoglBuffer *buffer)
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{
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if (COGL_BUFFER_FLAG_IS_SET (buffer, MAPPED))
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cogl_buffer_unmap (buffer);
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}
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/* OpenGL ES 1.1 and 2 have a GL_OES_mapbuffer extension that is able to map
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* VBOs for write only, we don't support that in CoglBuffer */
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#if defined (COGL_HAS_GLES)
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GLenum
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_cogl_buffer_access_to_gl_enum (CoglBufferAccess access)
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{
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return 0;
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}
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#else
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GLenum
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_cogl_buffer_access_to_gl_enum (CoglBufferAccess access)
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{
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if ((access & COGL_BUFFER_ACCESS_READ_WRITE) == COGL_BUFFER_ACCESS_READ_WRITE)
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return GL_READ_WRITE;
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else if (access & COGL_BUFFER_ACCESS_WRITE)
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return GL_WRITE_ONLY;
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else
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return GL_READ_ONLY;
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}
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#endif
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/* OpenGL ES 1.1 and 2 only know about STATIC_DRAW and DYNAMIC_DRAW */
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#if defined (COGL_HAS_GLES)
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GLenum
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_cogl_buffer_hints_to_gl_enum (CoglBufferUsageHint usage_hint,
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CoglBufferUpdateHint update_hint)
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{
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/* usage hint is always TEXTURE for now */
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if (update_hint == COGL_BUFFER_UPDATE_HINT_STATIC)
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return GL_STATIC_DRAW;
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return GL_DYNAMIC_DRAW;
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}
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#else
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GLenum
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_cogl_buffer_hints_to_gl_enum (CoglBufferUsageHint usage_hint,
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CoglBufferUpdateHint update_hint)
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{
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/* usage hint is always TEXTURE for now */
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if (update_hint == COGL_BUFFER_UPDATE_HINT_STATIC)
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return GL_STATIC_DRAW;
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if (update_hint == COGL_BUFFER_UPDATE_HINT_DYNAMIC)
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return GL_DYNAMIC_DRAW;
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if (update_hint == COGL_BUFFER_UPDATE_HINT_STREAM)
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return GL_STREAM_DRAW;
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return GL_STATIC_DRAW;
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}
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#endif
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void
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_cogl_buffer_bind (CoglBuffer *buffer,
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GLenum target)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* Don't bind again an already bound pbo */
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if (ctx->current_pbo == buffer)
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return;
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if (buffer && COGL_BUFFER_FLAG_IS_SET (buffer, BUFFER_OBJECT))
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{
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GE( glBindBuffer (target, buffer->gl_handle) );
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}
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else if (buffer == NULL &&
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ctx->current_pbo &&
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COGL_BUFFER_FLAG_IS_SET (ctx->current_pbo, BUFFER_OBJECT))
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{
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GE( glBindBuffer (target, 0) );
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}
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ctx->current_pbo = buffer;
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}
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unsigned int
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cogl_buffer_get_size_EXP (CoglBuffer *buffer)
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{
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if (!cogl_is_buffer (buffer))
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return 0;
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return COGL_BUFFER (buffer)->size;
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}
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void
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cogl_buffer_set_usage_hint_EXP (CoglBuffer *buffer,
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CoglBufferUsageHint hint)
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{
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if (!cogl_is_buffer (buffer))
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return;
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if (G_UNLIKELY (hint > COGL_BUFFER_USAGE_HINT_TEXTURE))
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hint = COGL_BUFFER_USAGE_HINT_TEXTURE;
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buffer->usage_hint = hint;
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}
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CoglBufferUsageHint
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cogl_buffer_get_usage_hint_EXP (CoglBuffer *buffer)
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{
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if (!cogl_is_buffer (buffer))
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return FALSE;
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return buffer->usage_hint;
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}
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void
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cogl_buffer_set_update_hint_EXP (CoglBuffer *buffer,
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CoglBufferUpdateHint hint)
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{
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if (!cogl_is_buffer (buffer))
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return;
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if (G_UNLIKELY (hint > COGL_BUFFER_UPDATE_HINT_STREAM))
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hint = COGL_BUFFER_UPDATE_HINT_STATIC;
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buffer->update_hint = hint;
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}
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CoglBufferUpdateHint
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cogl_buffer_get_update_hint_EXP (CoglBuffer *buffer)
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{
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if (!cogl_is_buffer (buffer))
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return FALSE;
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return buffer->update_hint;
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}
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guint8 *
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cogl_buffer_map_EXP (CoglBuffer *buffer,
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CoglBufferAccess access)
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{
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if (!cogl_is_buffer (buffer))
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return NULL;
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if (COGL_BUFFER_FLAG_IS_SET (buffer, MAPPED))
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return buffer->data;
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buffer->data = buffer->vtable->map (buffer, access);
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return buffer->data;
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}
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void
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cogl_buffer_unmap_EXP (CoglBuffer *buffer)
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{
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if (!cogl_is_buffer (buffer))
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return;
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if (!COGL_BUFFER_FLAG_IS_SET (buffer, MAPPED))
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return;
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buffer->vtable->unmap (buffer);
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}
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gboolean
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cogl_buffer_set_data_EXP (CoglBuffer *buffer,
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gsize offset,
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const guint8 *data,
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gsize size)
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{
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if (!cogl_is_buffer (buffer))
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return FALSE;
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if (G_UNLIKELY((offset + size) > buffer->size))
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return FALSE;
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return buffer->vtable->set_data (buffer, offset, data, size);
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}
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