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05ad89f912
Not only is our point transformation code is quite slow (well at least compared to a real GPU), but by deriving the texture coordinates from the vertex position we can elide the multiple arrays that we need to construct and pass to GL - improving performance by eliminating CPU overhead from needless transforms and data shovelling. However, not all vertex emission is suitable. For instance, for glyphs we need to emit discontiguous texture coordinates for each glyph, but span generation is suitable - which fortuitously also has the largest vertex density and so benefits the most. The only real concern is for hardware without true vertex shader support (e.g. i915) but there we are already invoking the VS to transform the vertex into the viewport. We would need to eliminate that transform as well as manually compute the texture coordinates in order to eliminate the vertex recomputation pass. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2011 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 either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairoint.h"
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#include "cairo-gl-private.h"
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#include "cairo-surface-backend-private.h"
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static cairo_status_t
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_cairo_gl_source_finish (void *abstract_surface)
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{
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cairo_gl_source_t *source = abstract_surface;
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_cairo_gl_operand_destroy (&source->operand);
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return CAIRO_STATUS_SUCCESS;
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}
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static const cairo_surface_backend_t cairo_gl_source_backend = {
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CAIRO_SURFACE_TYPE_GL,
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_cairo_gl_source_finish,
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NULL, /* read-only wrapper */
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};
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cairo_surface_t *
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_cairo_gl_pattern_to_source (cairo_surface_t *dst,
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const cairo_pattern_t *pattern,
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cairo_bool_t is_mask,
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const cairo_rectangle_int_t *extents,
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const cairo_rectangle_int_t *sample,
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int *src_x, int *src_y)
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{
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cairo_gl_source_t *source;
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cairo_int_status_t status;
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TRACE ((stderr, "%s\n", __FUNCTION__));
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if (pattern == NULL)
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return _cairo_gl_white_source ();
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source = malloc (sizeof (*source));
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if (unlikely (source == NULL))
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return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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_cairo_surface_init (&source->base,
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&cairo_gl_source_backend,
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NULL, /* device */
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CAIRO_CONTENT_COLOR_ALPHA);
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*src_x = *src_y = 0;
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status = _cairo_gl_operand_init (&source->operand, pattern,
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(cairo_gl_surface_t *)dst,
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sample, extents,
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FALSE);
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if (unlikely (status)) {
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cairo_surface_destroy (&source->base);
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return _cairo_surface_create_in_error (status);
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}
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return &source->base;
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}
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cairo_surface_t *
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_cairo_gl_white_source (void)
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{
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cairo_gl_source_t *source;
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source = malloc (sizeof (*source));
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if (unlikely (source == NULL))
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return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
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_cairo_surface_init (&source->base,
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&cairo_gl_source_backend,
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NULL, /* device */
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CAIRO_CONTENT_COLOR_ALPHA);
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_cairo_gl_solid_operand_init (&source->operand, CAIRO_COLOR_WHITE);
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return &source->base;
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}
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