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https://github.com/brl/mutter.git
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9e25f8c40d
This removes cogl_pixel_array_new which just took a size in bytes. Without the image size and pixel format then the driver often doesn't have enough information to allocate optimal GPU memory that can be textured from directly. This is because GPUs often have ways to spatially alter the layout of a texture to improve cache access patterns which may require special alignment and padding dependant in the images width, height and bpp. Although currently we are limited by OpenGL because it doesn't let us pass on the width and height when allocating a PBO, the hope is that we can define a better extension at some point.
325 lines
8.8 KiB
C
325 lines
8.8 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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* Robert Bragg <robert@linux.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-pixel-array.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-object.h"
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#include "cogl-pixel-array-private.h"
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#include "cogl-pixel-array.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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#ifndef GL_PIXEL_UNPACK_BUFFER
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#define GL_PIXEL_UNPACK_BUFFER GL_PIXEL_UNPACK_BUFFER_ARB
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#endif
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#ifndef GL_PIXEL_PACK_BUFFER
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#define GL_PIXEL_PACK_BUFFER GL_PIXEL_PACK_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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static void
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_cogl_pixel_array_free (CoglPixelArray *buffer);
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#if !defined (COGL_HAS_GLES)
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static const CoglBufferVtable
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cogl_pixel_array_vtable;
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#endif
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static const CoglBufferVtable
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cogl_malloc_pixel_array_vtable;
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COGL_BUFFER_DEFINE (PixelArray, pixel_array)
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static CoglPixelArray *
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_cogl_pixel_array_new (unsigned int size)
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{
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CoglPixelArray *pixel_array = g_slice_new0 (CoglPixelArray);
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CoglBuffer *buffer = COGL_BUFFER (pixel_array);
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_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
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/* parent's constructor */
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_cogl_buffer_initialize (buffer,
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size,
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COGL_BUFFER_USAGE_HINT_TEXTURE,
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COGL_BUFFER_UPDATE_HINT_STATIC);
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/* malloc version only for GLES */
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#if !defined (COGL_HAS_GLES)
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if (cogl_features_available (COGL_FEATURE_PBOS))
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{
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/* PBOS */
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buffer->vtable = &cogl_pixel_array_vtable;
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GE( glGenBuffers (1, &buffer->gl_handle) );
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COGL_BUFFER_SET_FLAG (buffer, BUFFER_OBJECT);
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}
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else
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#endif
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{
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/* malloc fallback subclass */
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buffer->vtable = &cogl_malloc_pixel_array_vtable;
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/* create the buffer here as there's no point for a lazy allocation in
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* the malloc case */
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buffer->data = g_malloc (size);
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}
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pixel_array->flags = COGL_PIXEL_ARRAY_FLAG_NONE;
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/* return COGL_INVALID_HANDLE; */
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return _cogl_pixel_array_object_new (pixel_array);
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}
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CoglPixelArray *
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cogl_pixel_array_new_with_size (unsigned int width,
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unsigned int height,
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CoglPixelFormat format,
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unsigned int *rowstride)
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{
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CoglPixelArray *buffer;
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CoglPixelArray *pixel_array;
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unsigned int stride;
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/* creating a buffer to store "any" format does not make sense */
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if (G_UNLIKELY (format == COGL_PIXEL_FORMAT_ANY))
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return COGL_INVALID_HANDLE;
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/* for now we fallback to cogl_pixel_array_new, later, we could ask
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* libdrm a tiled buffer for instance */
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stride = width * _cogl_get_format_bpp (format);
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if (rowstride)
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*rowstride = stride;
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buffer = _cogl_pixel_array_new (height * stride);
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if (G_UNLIKELY (buffer == COGL_INVALID_HANDLE))
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return COGL_INVALID_HANDLE;
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pixel_array = COGL_PIXEL_ARRAY (buffer);
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pixel_array->width = width;
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pixel_array->height = height;
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pixel_array->format = format;
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pixel_array->stride = stride;
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return buffer;
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}
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static void
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_cogl_pixel_array_free (CoglPixelArray *buffer)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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/* parent's destructor */
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_cogl_buffer_fini (COGL_BUFFER (buffer));
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GE( glDeleteBuffers (1, &(COGL_BUFFER (buffer)->gl_handle)) );
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g_slice_free (CoglPixelArray, buffer);
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}
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#if !defined (COGL_HAS_GLES)
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static guint8 *
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_cogl_pixel_array_map (CoglBuffer *buffer,
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CoglBufferAccess access)
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{
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CoglPixelArray *pixel_array = COGL_PIXEL_ARRAY (buffer);
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GLenum gl_target;
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guint8 *data;
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_COGL_GET_CONTEXT (ctx, NULL);
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/* we determine the target lazily, on the first map */
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gl_target = GL_PIXEL_UNPACK_BUFFER;
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pixel_array->gl_target = gl_target;
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_cogl_buffer_bind (buffer, gl_target);
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/* create an empty store if we don't have one yet. creating the store
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* lazily allows the user of the CoglBuffer to set a hint before the
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* store is created. */
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if (!COGL_PIXEL_ARRAY_FLAG_IS_SET (pixel_array, STORE_CREATED))
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{
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GE( glBufferData (gl_target,
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buffer->size,
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NULL,
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_cogl_buffer_hints_to_gl_enum (buffer->usage_hint,
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buffer->update_hint)) );
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COGL_PIXEL_ARRAY_SET_FLAG (pixel_array, STORE_CREATED);
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}
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GE_RET( data, glMapBuffer (gl_target,
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_cogl_buffer_access_to_gl_enum (access)) );
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if (data)
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COGL_BUFFER_SET_FLAG (buffer, MAPPED);
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_cogl_buffer_bind (NULL, gl_target);
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return data;
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}
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static void
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_cogl_pixel_array_unmap (CoglBuffer *buffer)
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{
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CoglPixelArray *pixel_array = COGL_PIXEL_ARRAY (buffer);
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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_cogl_buffer_bind (buffer, pixel_array->gl_target);
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GE( glUnmapBuffer (pixel_array->gl_target) );
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COGL_BUFFER_CLEAR_FLAG (buffer, MAPPED);
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_cogl_buffer_bind (NULL, pixel_array->gl_target);
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}
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static gboolean
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_cogl_pixel_array_set_data (CoglBuffer *buffer,
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unsigned int offset,
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const guint8 *data,
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unsigned int size)
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{
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CoglPixelArray *pixel_array = COGL_PIXEL_ARRAY (buffer);
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_COGL_GET_CONTEXT (ctx, FALSE);
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pixel_array->gl_target = GL_PIXEL_UNPACK_BUFFER;
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_cogl_buffer_bind (buffer, pixel_array->gl_target);
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/* create an empty store if we don't have one yet. creating the store
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* lazily allows the user of the CoglBuffer to set a hint before the
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* store is created. */
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if (!COGL_PIXEL_ARRAY_FLAG_IS_SET (pixel_array, STORE_CREATED))
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{
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GE( glBufferData (pixel_array->gl_target,
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buffer->size,
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NULL,
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_cogl_buffer_hints_to_gl_enum (buffer->usage_hint,
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buffer->update_hint)) );
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COGL_PIXEL_ARRAY_SET_FLAG (pixel_array, STORE_CREATED);
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}
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GE( glBufferSubData (pixel_array->gl_target, offset, size, data) );
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_cogl_buffer_bind (NULL, pixel_array->gl_target);
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return TRUE;
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}
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#if 0
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gboolean
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cogl_pixel_array_set_region (CoglPixelArray *buffer,
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guint8 *data,
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unsigned int src_width,
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unsigned int src_height,
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unsigned int src_rowstride,
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unsigned int dst_x,
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unsigned int dst_y)
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{
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if (!cogl_is_pixel_array (buffer))
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return FALSE;
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return TRUE;
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}
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#endif
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static const CoglBufferVtable cogl_pixel_array_vtable =
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{
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_cogl_pixel_array_map,
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_cogl_pixel_array_unmap,
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_cogl_pixel_array_set_data,
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};
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#endif
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/*
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* Fallback path, buffer->data points to a malloc'ed buffer.
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*/
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static guint8 *
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_cogl_malloc_pixel_array_map (CoglBuffer *buffer,
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CoglBufferAccess access)
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{
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COGL_BUFFER_SET_FLAG (buffer, MAPPED);
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return buffer->data;
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}
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static void
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_cogl_malloc_pixel_array_unmap (CoglBuffer *buffer)
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{
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COGL_BUFFER_CLEAR_FLAG (buffer, MAPPED);
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}
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static gboolean
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_cogl_malloc_pixel_array_set_data (CoglBuffer *buffer,
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unsigned int offset,
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const guint8 *data,
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unsigned int size)
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{
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memcpy (buffer->data + offset, data, size);
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return TRUE;
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}
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static const CoglBufferVtable cogl_malloc_pixel_array_vtable =
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{
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_cogl_malloc_pixel_array_map,
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_cogl_malloc_pixel_array_unmap,
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_cogl_malloc_pixel_array_set_data,
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};
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