0bce7eac53
As part of an incremental process to have Cogl be a standalone project we
want to re-consider how we organise the Cogl source code.
Currently this is the structure I'm aiming for:
cogl/
cogl/
<put common source here>
winsys/
cogl-glx.c
cogl-wgl.c
driver/
gl/
gles/
os/ ?
utils/
cogl-fixed
cogl-matrix-stack?
cogl-journal?
cogl-primitives?
pango/
The new winsys component is a starting point for migrating window system
code (i.e. x11,glx,wgl,osx,egl etc) from Clutter to Cogl.
The utils/ and pango/ directories aren't added by this commit, but they are
noted because I plan to add them soon.
Overview of the planned structure:
* The winsys/ API is the API that binds OpenGL to a specific window system,
be that X11 or win32 etc. Example are glx, wgl and egl. Much of the logic
under clutter/{glx,osx,win32 etc} should migrate here.
* Note there is also the idea of a winsys-base that may represent a window
system for which there are multiple winsys APIs. An example of this is
x11, since glx and egl may both be used with x11. (currently only Clutter
has the idea of a winsys-base)
* The driver/ represents a specific varient of OpenGL. Currently we have "gl"
representing OpenGL 1.4-2.1 (mostly fixed function) and "gles" representing
GLES 1.1 (fixed funciton) and 2.0 (fully shader based)
* Everything under cogl/ should fundamentally be supporting access to the
GPU. Essentially Cogl's most basic requirement is to provide a nice GPU
Graphics API and drawing a line between this and the utility functionality
we add to support Clutter should help keep this lean and maintainable.
* Code under utils/ as suggested builds on cogl/ adding more convenient
APIs or mechanism to optimize special cases. Broadly speaking you can
compare cogl/ to OpenGL and utils/ to GLU.
* clutter/pango will be moved to clutter/cogl/pango
How some of the internal configure.ac/pkg-config terminology has changed:
backendextra -> CLUTTER_WINSYS_BASE # e.g. "x11"
backendextralib -> CLUTTER_WINSYS_BASE_LIB # e.g. "x11/libclutter-x11.la"
clutterbackend -> {CLUTTER,COGL}_WINSYS # e.g. "glx"
CLUTTER_FLAVOUR -> {CLUTTER,COGL}_WINSYS
clutterbackendlib -> CLUTTER_WINSYS_LIB
CLUTTER_COGL -> COGL_DRIVER # e.g. "gl"
Note: The CLUTTER_FLAVOUR and CLUTTER_COGL defines are kept for apps
As the first thing to take advantage of the new winsys component in Cogl;
cogl_get_proc_address() has been moved from cogl/{gl,gles}/cogl.c into
cogl/common/cogl.c and this common implementation first trys
_cogl_winsys_get_proc_address() but if that fails then it falls back to
gmodule.
482 lines
15 KiB
C
482 lines
15 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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* Authors:
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* Matthew Allum <mallum@openedhand.com>
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* Neil Roberts <neil@linux.intel.com>
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* Robert Bragg <robert@linux.intel.com>
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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 "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-bitmap.h"
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#include "cogl-bitmap-private.h"
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#include "cogl-texture-private.h"
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#include "cogl-material.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-primitives.h"
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include "cogl-gles2-wrapper.h"
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void
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_cogl_texture_driver_bind (GLenum gl_target,
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GLuint gl_handle,
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GLenum gl_intformat)
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{
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GE (cogl_gles2_wrapper_bind_texture (gl_target, gl_handle, gl_intformat));
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}
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void
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_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
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int pixels_bpp)
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{
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_cogl_texture_prep_gl_alignment_for_pixels_upload (pixels_rowstride);
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}
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void
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_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
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int pixels_bpp)
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{
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_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_rowstride);
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}
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void
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_cogl_texture_driver_upload_subregion_to_gl (CoglTexture *tex,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height,
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CoglBitmap *source_bmp,
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GLuint source_gl_format,
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GLuint source_gl_type,
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GLuint gl_handle)
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{
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int bpp = _cogl_get_format_bpp (source_bmp->format);
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CoglBitmap slice_bmp;
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/* NB: GLES doesn't support the GL_UNPACK_ROW_LENGTH, GL_UNPACK_SKIP_PIXELS
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* or GL_UNPACK_SKIP_ROWS pixel store options so we can't directly source a
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* sub-region from source_bmp, we need to use a transient bitmap instead. */
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/* FIXME: optimize by not copying to intermediate slice bitmap when source
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* rowstride = bpp * width and the texture image is not sliced */
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/* Setup temp bitmap for slice subregion */
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slice_bmp.format = tex->bitmap.format;
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slice_bmp.width = width;
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slice_bmp.height = height;
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slice_bmp.rowstride = bpp * slice_bmp.width;
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slice_bmp.data = (guchar*) g_malloc (slice_bmp.rowstride * slice_bmp.height);
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/* Setup gl alignment to match rowstride and top-left corner */
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_cogl_texture_driver_prep_gl_for_pixels_upload (slice_bmp.rowstride,
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bpp);
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/* Copy subregion data */
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_cogl_bitmap_copy_subregion (source_bmp,
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&slice_bmp,
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src_x,
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src_y,
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0, 0,
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slice_bmp.width,
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slice_bmp.height);
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/* Upload new image data */
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GE( _cogl_texture_driver_bind (tex->gl_target,
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gl_handle, tex->gl_intformat) );
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GE( glTexSubImage2D (tex->gl_target, 0,
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dst_x, dst_y,
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width, height,
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source_gl_format,
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source_gl_type,
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slice_bmp.data) );
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/* Free temp bitmap */
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g_free (slice_bmp.data);
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}
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static void
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_cogl_texture_draw_and_read (CoglTexture *tex,
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CoglBitmap *target_bmp,
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GLint *viewport)
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{
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gint bpp;
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float rx1, ry1;
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float rx2, ry2;
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float tx1, ty1;
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float tx2, ty2;
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int bw, bh;
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CoglBitmap rect_bmp;
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CoglHandle handle;
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handle = (CoglHandle) tex;
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bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
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ry1 = 0; ry2 = 0;
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ty1 = 0; ty2 = 0;
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/* Walk Y axis until whole bitmap height consumed */
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for (bh = tex->bitmap.height; bh > 0; bh -= viewport[3])
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{
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/* Rectangle Y coords */
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ry1 = ry2;
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ry2 += (bh < viewport[3]) ? bh : viewport[3];
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/* Normalized texture Y coords */
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ty1 = ty2;
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ty2 = (ry2 / (float)tex->bitmap.height);
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rx1 = 0; rx2 = 0;
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tx1 = 0; tx2 = 0;
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/* Walk X axis until whole bitmap width consumed */
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for (bw = tex->bitmap.width; bw > 0; bw-=viewport[2])
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{
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/* Rectangle X coords */
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rx1 = rx2;
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rx2 += (bw < viewport[2]) ? bw : viewport[2];
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/* Normalized texture X coords */
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tx1 = tx2;
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tx2 = (rx2 / (float)tex->bitmap.width);
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/* Draw a portion of texture */
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cogl_rectangle_with_texture_coords (0, 0,
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rx2 - rx1,
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ry2 - ry1,
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tx1, ty1,
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tx2, ty2);
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/* Read into a temporary bitmap */
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rect_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
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rect_bmp.width = rx2 - rx1;
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rect_bmp.height = ry2 - ry1;
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rect_bmp.rowstride = bpp * rect_bmp.width;
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rect_bmp.data = (guchar*) g_malloc (rect_bmp.rowstride *
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rect_bmp.height);
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_cogl_texture_driver_prep_gl_for_pixels_download (rect_bmp.rowstride,
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bpp);
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GE( glReadPixels (viewport[0], viewport[1],
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rect_bmp.width,
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rect_bmp.height,
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GL_RGBA, GL_UNSIGNED_BYTE,
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rect_bmp.data) );
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/* Copy to target bitmap */
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_cogl_bitmap_copy_subregion (&rect_bmp,
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target_bmp,
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0,0,
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rx1,ry1,
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rect_bmp.width,
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rect_bmp.height);
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/* Free temp bitmap */
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g_free (rect_bmp.data);
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}
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}
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}
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gboolean
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_cogl_texture_driver_download_from_gl (CoglTexture *tex,
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CoglBitmap *target_bmp,
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GLuint target_gl_format,
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GLuint target_gl_type)
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{
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gint bpp;
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GLint viewport[4];
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CoglBitmap alpha_bmp;
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CoglHandle prev_source;
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_COGL_GET_CONTEXT (ctx, FALSE);
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bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
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/* Viewport needs to have some size and be inside the window for this */
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GE( glGetIntegerv (GL_VIEWPORT, viewport) );
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if (viewport[0] < 0 || viewport[1] < 0 ||
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viewport[2] <= 0 || viewport[3] <= 0)
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return FALSE;
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/* Setup orthographic projection into current viewport
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(0,0 in bottom-left corner to draw the texture
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upside-down so we match the way glReadPixels works) */
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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_cogl_current_matrix_ortho (0, (float)(viewport[2]),
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0, (float)(viewport[3]),
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(float)(0),
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(float)(100));
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_push ();
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_cogl_current_matrix_identity ();
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/* Direct copy operation */
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if (ctx->drv.texture_download_material == COGL_INVALID_HANDLE)
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{
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ctx->drv.texture_download_material = cogl_material_new ();
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cogl_material_set_blend (ctx->drv.texture_download_material,
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"RGBA = ADD (SRC_COLOR, 0)",
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NULL);
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}
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prev_source = cogl_handle_ref (ctx->source_material);
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cogl_set_source (ctx->drv.texture_download_material);
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cogl_material_set_layer (ctx->drv.texture_download_material, 0, tex);
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cogl_material_set_layer_combine (ctx->drv.texture_download_material,
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0, /* layer */
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"RGBA = REPLACE (TEXTURE)",
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NULL);
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_cogl_texture_draw_and_read (tex, target_bmp, viewport);
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/* Check whether texture has alpha and framebuffer not */
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/* FIXME: For some reason even if ALPHA_BITS is 8, the framebuffer
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still doesn't seem to have an alpha buffer. This might be just
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a PowerVR issue.
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GLint r_bits, g_bits, b_bits, a_bits;
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GE( glGetIntegerv (GL_ALPHA_BITS, &a_bits) );
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GE( glGetIntegerv (GL_RED_BITS, &r_bits) );
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GE( glGetIntegerv (GL_GREEN_BITS, &g_bits) );
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GE( glGetIntegerv (GL_BLUE_BITS, &b_bits) );
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printf ("R bits: %d\n", r_bits);
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printf ("G bits: %d\n", g_bits);
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printf ("B bits: %d\n", b_bits);
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printf ("A bits: %d\n", a_bits); */
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if ((tex->bitmap.format & COGL_A_BIT)/* && a_bits == 0*/)
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{
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guchar *srcdata;
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guchar *dstdata;
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guchar *srcpixel;
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guchar *dstpixel;
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gint x,y;
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/* Create temp bitmap for alpha values */
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alpha_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
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alpha_bmp.width = target_bmp->width;
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alpha_bmp.height = target_bmp->height;
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alpha_bmp.rowstride = bpp * alpha_bmp.width;
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alpha_bmp.data = (guchar*) g_malloc (alpha_bmp.rowstride *
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alpha_bmp.height);
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/* Draw alpha values into RGB channels */
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cogl_material_set_layer_combine (ctx->drv.texture_download_material,
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0, /* layer */
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"RGBA = REPLACE (TEXTURE[A])",
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NULL);
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_cogl_texture_draw_and_read (tex, &alpha_bmp, viewport);
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/* Copy temp R to target A */
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srcdata = alpha_bmp.data;
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dstdata = target_bmp->data;
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for (y=0; y<target_bmp->height; ++y)
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{
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for (x=0; x<target_bmp->width; ++x)
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{
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srcpixel = srcdata + x*bpp;
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dstpixel = dstdata + x*bpp;
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dstpixel[3] = srcpixel[0];
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}
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srcdata += alpha_bmp.rowstride;
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dstdata += target_bmp->rowstride;
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}
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g_free (alpha_bmp.data);
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}
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/* Restore old state */
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_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
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_cogl_current_matrix_pop ();
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_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
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_cogl_current_matrix_pop ();
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/* restore the original material */
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cogl_set_source (prev_source);
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cogl_handle_unref (prev_source);
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return TRUE;
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}
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gboolean
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_cogl_texture_driver_size_supported (GLenum gl_target,
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GLenum gl_format,
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GLenum gl_type,
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int width,
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int height)
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{
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return TRUE;
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}
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void
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_cogl_texture_driver_try_setting_gl_border_color (
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GLuint gl_target,
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const GLfloat *transparent_color)
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{
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/* FAIL! */
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}
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gboolean
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_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
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CoglPixelFormat *out_format)
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{
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return TRUE;
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}
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CoglPixelFormat
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_cogl_pixel_format_to_gl (CoglPixelFormat format,
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GLenum *out_glintformat,
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GLenum *out_glformat,
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GLenum *out_gltype)
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{
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CoglPixelFormat required_format;
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GLenum glintformat = 0;
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GLenum glformat = 0;
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GLenum gltype = 0;
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/* FIXME: check YUV support */
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required_format = format;
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/* Find GL equivalents */
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switch (format & COGL_UNPREMULT_MASK)
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{
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case COGL_PIXEL_FORMAT_A_8:
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glintformat = GL_ALPHA;
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glformat = GL_ALPHA;
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gltype = GL_UNSIGNED_BYTE;
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break;
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case COGL_PIXEL_FORMAT_G_8:
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glintformat = GL_LUMINANCE;
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glformat = GL_LUMINANCE;
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gltype = GL_UNSIGNED_BYTE;
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break;
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/* Just one 24-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGB_888:
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case COGL_PIXEL_FORMAT_BGR_888:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGB_888;
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break;
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/* Just one 32-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGBA_8888:
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case COGL_PIXEL_FORMAT_BGRA_8888:
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case COGL_PIXEL_FORMAT_ARGB_8888:
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case COGL_PIXEL_FORMAT_ABGR_8888:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGBA_8888;
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required_format |= (format & COGL_PREMULT_BIT);
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break;
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/* The following three types of channel ordering
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* are always defined using system word byte
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* ordering (even according to GLES spec) */
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case COGL_PIXEL_FORMAT_RGB_565:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_SHORT_5_6_5;
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break;
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case COGL_PIXEL_FORMAT_RGBA_4444:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_4_4_4_4;
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break;
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case COGL_PIXEL_FORMAT_RGBA_5551:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_5_5_5_1;
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break;
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/* FIXME: check extensions for YUV support */
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default:
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break;
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}
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if (out_glintformat != NULL)
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*out_glintformat = glintformat;
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if (out_glformat != NULL)
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*out_glformat = glformat;
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if (out_gltype != NULL)
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*out_gltype = gltype;
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return required_format;
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}
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gboolean
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_cogl_texture_driver_allows_foreign_gl_target (GLenum gl_target)
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{
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/* Allow 2-dimensional textures only */
|
|
if (gl_target != GL_TEXTURE_2D)
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
_cogl_texture_driver_gl_generate_mipmaps (GLenum gl_target)
|
|
{
|
|
GE( cogl_wrap_glGenerateMipmap (gl_target) );
|
|
}
|
|
|
|
CoglPixelFormat
|
|
_cogl_texture_driver_find_best_gl_get_data_format (
|
|
CoglPixelFormat format,
|
|
GLenum *closest_gl_format,
|
|
GLenum *closest_gl_type)
|
|
{
|
|
/* Find closest format that's supported by GL
|
|
(Can't use _cogl_pixel_format_to_gl since available formats
|
|
when reading pixels on GLES are severely limited) */
|
|
*closest_gl_format = GL_RGBA;
|
|
*closest_gl_type = GL_UNSIGNED_BYTE;
|
|
return COGL_PIXEL_FORMAT_RGBA_8888;
|
|
}
|
|
|