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f2d701c809
cogl_blend_func caches blending setup much like cogl_enable does with the enable flags. This separates blending factors setup from the enable/disable operation in preparation of the texture image retrieval fix for alpha channel on GLES. (cogl_enable:) Does not modify blending factors anymore. * clutter/cogl/gl(es)/cogl-context.h: CoglContext holds two new variables to cache blending src and dst factors. * clutter/cogl/gl(es)/cogl-context.c: (cogl_create_context:) Initialize blending factors. * clutter/cogl/gles/cogl-texture.c: (cogl_texture_download_from_gl:) Set blending factors to CGL_ONE, CGL_ZERO which fixes the slighlty improper behavior where source colour was actually multiplied with its alpha value in the result (not noticable on current tests).
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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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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#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 <GLES/gl.h>
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#include <string.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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static CoglContext *_context = NULL;
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gboolean
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cogl_create_context ()
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{
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if (_context != NULL)
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return FALSE;
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/* Allocate context memory */
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_context = (CoglContext*) g_malloc (sizeof (CoglContext));
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/* Init default values */
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_context->feature_flags = 0;
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_context->features_cached = FALSE;
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_context->enable_flags = 0;
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_context->color_alpha = 255;
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_context->path_nodes = NULL;
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_context->path_nodes_cap = 0;
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_context->path_nodes_size = 0;
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_context->texture_handles = NULL;
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_context->texture_vertices_size = 0;
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_context->texture_vertices = NULL;
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_context->fbo_handles = NULL;
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_context->draw_buffer = COGL_WINDOW_BUFFER;
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_context->blend_src_factor = CGL_SRC_ALPHA;
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_context->blend_dst_factor = CGL_ONE_MINUS_SRC_ALPHA;
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/* Init OpenGL state */
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GE( glTexEnvx (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE) );
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GE( glColorMask (TRUE, TRUE, TRUE, FALSE) );
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GE( glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) );
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cogl_enable (0);
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return TRUE;
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}
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void
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cogl_destroy_context ()
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{
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if (_context == NULL)
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return;
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if (_context->texture_vertices)
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g_free (_context->texture_vertices);
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g_free (_context);
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}
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CoglContext *
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_cogl_context_get_default ()
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{
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/* Create if doesn't exists yet */
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if (_context == NULL)
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cogl_create_context ();
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return _context;
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}
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