486 lines
14 KiB
C
486 lines
14 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2009 Eric Anholt
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* Copyright © 2009 Chris Wilson
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* Copyright © 2005,2010 Red Hat, Inc
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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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* Benjamin Otte <otte@gnome.org>
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* Carl Worth <cworth@cworth.org>
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* Chris Wilson <chris@chris-wilson.co.uk>
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* Eric Anholt <eric@anholt.net>
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* T. Zachary Laine <whatwasthataddress@gmail.com>
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*/
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#ifndef CAIRO_GL_PRIVATE_H
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#define CAIRO_GL_PRIVATE_H
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#include "cairoint.h"
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#include "cairo-gl-gradient-private.h"
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#include "cairo-device-private.h"
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#include "cairo-error-private.h"
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#include "cairo-rtree-private.h"
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#include <assert.h>
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#include <GL/glew.h>
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#include "cairo-gl.h"
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#include <GL/gl.h>
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#define GL_GLEXT_PROTOTYPES
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#include <GL/glext.h>
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#define DEBUG_GL 0
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#if DEBUG_GL && __GNUC__
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#define UNSUPPORTED(reason) ({ \
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fprintf (stderr, \
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"cairo-gl: hit unsupported operation in %s(), line %d: %s\n", \
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__FUNCTION__, __LINE__, reason); \
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CAIRO_INT_STATUS_UNSUPPORTED; \
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})
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#else
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#define UNSUPPORTED(reason) CAIRO_INT_STATUS_UNSUPPORTED
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#endif
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/* maximal number of shaders we keep in the cache.
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* Random number that is hopefully big enough to not cause many cache evictions. */
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#define CAIRO_GL_MAX_SHADERS_PER_CONTEXT 64
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/* VBO size that we allocate, smaller size means we gotta flush more often */
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#define CAIRO_GL_VBO_SIZE 16384
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typedef struct _cairo_gl_surface {
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cairo_surface_t base;
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int width, height;
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GLuint tex; /* GL texture object containing our data. */
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GLuint fb; /* GL framebuffer object wrapping our data. */
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GLuint depth; /* GL framebuffer object holding depth */
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int owns_tex;
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} cairo_gl_surface_t;
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typedef struct cairo_gl_glyph_cache {
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cairo_rtree_t rtree;
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cairo_surface_pattern_t pattern;
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} cairo_gl_glyph_cache_t;
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typedef enum cairo_gl_tex {
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CAIRO_GL_TEX_SOURCE = 0,
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CAIRO_GL_TEX_MASK = 1,
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CAIRO_GL_TEX_TEMP = 2
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} cairo_gl_tex_t;
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typedef enum cairo_gl_operand_type {
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CAIRO_GL_OPERAND_NONE,
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CAIRO_GL_OPERAND_CONSTANT,
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CAIRO_GL_OPERAND_TEXTURE,
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CAIRO_GL_OPERAND_LINEAR_GRADIENT,
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CAIRO_GL_OPERAND_RADIAL_GRADIENT,
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CAIRO_GL_OPERAND_SPANS,
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CAIRO_GL_OPERAND_COUNT
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} cairo_gl_operand_type_t;
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typedef struct cairo_gl_shader_impl cairo_gl_shader_impl_t;
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typedef struct cairo_gl_shader {
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GLuint fragment_shader;
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GLuint program;
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} cairo_gl_shader_t;
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typedef enum cairo_gl_shader_in {
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CAIRO_GL_SHADER_IN_NORMAL,
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CAIRO_GL_SHADER_IN_CA_SOURCE,
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CAIRO_GL_SHADER_IN_CA_SOURCE_ALPHA,
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CAIRO_GL_SHADER_IN_COUNT
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} cairo_gl_shader_in_t;
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typedef enum cairo_gl_var_type {
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CAIRO_GL_VAR_NONE,
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CAIRO_GL_VAR_TEXCOORDS,
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CAIRO_GL_VAR_COVERAGE
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} cairo_gl_var_type_t;
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#define cairo_gl_var_type_hash(src,mask,dest) ((mask) << 2 | (src << 1) | (dest))
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#define CAIRO_GL_VAR_TYPE_MAX ((CAIRO_GL_VAR_COVERAGE << 2) | (CAIRO_GL_VAR_TEXCOORDS << 1) | CAIRO_GL_VAR_TEXCOORDS)
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/* This union structure describes a potential source or mask operand to the
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* compositing equation.
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*/
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typedef struct cairo_gl_operand {
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cairo_gl_operand_type_t type;
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union {
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struct {
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GLuint tex;
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cairo_gl_surface_t *surface;
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cairo_surface_attributes_t attributes;
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} texture;
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struct {
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GLfloat color[4];
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} constant;
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struct {
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cairo_gl_gradient_t *gradient;
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cairo_matrix_t m;
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float segment_x;
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float segment_y;
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cairo_extend_t extend;
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} linear;
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struct {
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cairo_gl_gradient_t *gradient;
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cairo_matrix_t m;
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float circle_1_x;
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float circle_1_y;
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float radius_0;
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float radius_1;
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cairo_extend_t extend;
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} radial;
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};
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unsigned int vertex_offset;
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} cairo_gl_operand_t;
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struct _cairo_gl_context {
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cairo_device_t base;
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GLuint dummy_tex;
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GLuint texture_load_pbo;
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GLuint vbo;
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GLint max_framebuffer_size;
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GLint max_texture_size;
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GLint max_textures;
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GLenum tex_target;
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const cairo_gl_shader_impl_t *shader_impl;
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GLuint vertex_shaders[CAIRO_GL_VAR_TYPE_MAX + 1];
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cairo_gl_shader_t fill_rectangles_shader;
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cairo_cache_t shaders;
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cairo_cache_t gradients;
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cairo_gl_glyph_cache_t glyph_cache[2];
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cairo_list_t fonts;
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cairo_gl_surface_t *current_target;
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cairo_operator_t current_operator;
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cairo_gl_shader_t *pre_shader; /* for component alpha */
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cairo_gl_shader_t *current_shader;
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cairo_gl_operand_t operands[2];
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char *vb;
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unsigned int vb_offset;
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unsigned int vertex_size;
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cairo_region_t *clip_region;
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void (*acquire) (void *ctx);
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void (*release) (void *ctx);
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void (*make_current) (void *ctx, cairo_gl_surface_t *surface);
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void (*swap_buffers)(void *ctx, cairo_gl_surface_t *surface);
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void (*destroy) (void *ctx);
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};
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typedef struct _cairo_gl_composite {
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cairo_gl_surface_t *dst;
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cairo_operator_t op;
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cairo_region_t *clip_region;
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cairo_gl_operand_t src;
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cairo_gl_operand_t mask;
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} cairo_gl_composite_t;
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cairo_private extern const cairo_surface_backend_t _cairo_gl_surface_backend;
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static cairo_always_inline GLenum
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_cairo_gl_get_error (void)
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{
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GLenum err = glGetError();
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if (unlikely (err))
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while (glGetError ());
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return err;
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}
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static inline cairo_device_t *
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_cairo_gl_context_create_in_error (cairo_status_t status)
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{
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return (cairo_device_t *) _cairo_device_create_in_error (status);
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}
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cairo_private cairo_status_t
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_cairo_gl_context_init (cairo_gl_context_t *ctx);
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cairo_private void
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_cairo_gl_surface_init (cairo_device_t *device,
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cairo_gl_surface_t *surface,
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cairo_content_t content,
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int width, int height);
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static cairo_always_inline cairo_bool_t cairo_warn
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_cairo_gl_surface_is_texture (cairo_gl_surface_t *surface)
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{
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return surface->tex != 0;
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}
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cairo_private cairo_status_t
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_cairo_gl_surface_draw_image (cairo_gl_surface_t *dst,
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cairo_image_surface_t *src,
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int src_x, int src_y,
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int width, int height,
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int dst_x, int dst_y);
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static cairo_always_inline cairo_bool_t
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_cairo_gl_device_has_glsl (cairo_device_t *device)
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{
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return ((cairo_gl_context_t *) device)->shader_impl != NULL;
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}
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static cairo_always_inline cairo_bool_t
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_cairo_gl_device_requires_power_of_two_textures (cairo_device_t *device)
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{
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return ((cairo_gl_context_t *) device)->tex_target == GL_TEXTURE_RECTANGLE_EXT;
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}
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static cairo_always_inline cairo_status_t cairo_warn
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_cairo_gl_context_acquire (cairo_device_t *device,
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cairo_gl_context_t **ctx)
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{
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cairo_status_t status;
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status = cairo_device_acquire (device);
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if (unlikely (status))
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return status;
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/* clear potential previous GL errors */
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_cairo_gl_get_error ();
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*ctx = (cairo_gl_context_t *) device;
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return CAIRO_STATUS_SUCCESS;
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}
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static cairo_always_inline cairo_warn cairo_status_t
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_cairo_gl_context_release (cairo_gl_context_t *ctx, cairo_status_t status)
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{
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GLenum err;
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err = _cairo_gl_get_error ();
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if (unlikely (err)) {
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cairo_status_t new_status;
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new_status = _cairo_error (CAIRO_STATUS_DEVICE_ERROR);
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if (status == CAIRO_STATUS_SUCCESS)
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status = new_status;
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}
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cairo_device_release (&(ctx)->base);
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return status;
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}
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cairo_private void
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_cairo_gl_context_set_destination (cairo_gl_context_t *ctx, cairo_gl_surface_t *surface);
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cairo_private void
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_cairo_gl_context_activate (cairo_gl_context_t *ctx,
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cairo_gl_tex_t tex_unit);
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cairo_private cairo_bool_t
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_cairo_gl_operator_is_supported (cairo_operator_t op);
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cairo_private cairo_status_t
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_cairo_gl_composite_init (cairo_gl_composite_t *setup,
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cairo_operator_t op,
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cairo_gl_surface_t *dst,
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cairo_bool_t has_component_alpha,
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const cairo_rectangle_int_t *rect);
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cairo_private void
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_cairo_gl_composite_fini (cairo_gl_composite_t *setup);
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cairo_private void
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_cairo_gl_composite_set_clip_region (cairo_gl_composite_t *setup,
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cairo_region_t *clip_region);
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cairo_private cairo_int_status_t
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_cairo_gl_composite_set_source (cairo_gl_composite_t *setup,
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const cairo_pattern_t *pattern,
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int src_x, int src_y,
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int dst_x, int dst_y,
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int width, int height);
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cairo_private cairo_int_status_t
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_cairo_gl_composite_set_mask (cairo_gl_composite_t *setup,
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const cairo_pattern_t *pattern,
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int src_x, int src_y,
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int dst_x, int dst_y,
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int width, int height);
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cairo_private void
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_cairo_gl_composite_set_mask_spans (cairo_gl_composite_t *setup);
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cairo_private cairo_status_t
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_cairo_gl_composite_begin (cairo_gl_composite_t *setup,
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cairo_gl_context_t **ctx);
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cairo_private void
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_cairo_gl_composite_emit_rect (cairo_gl_context_t *ctx,
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GLfloat x1,
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GLfloat y1,
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GLfloat x2,
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GLfloat y2,
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uint8_t alpha);
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cairo_private void
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_cairo_gl_composite_emit_glyph (cairo_gl_context_t *ctx,
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GLfloat x1,
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GLfloat y1,
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GLfloat x2,
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GLfloat y2,
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GLfloat glyph_x1,
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GLfloat glyph_y1,
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GLfloat glyph_x2,
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GLfloat glyph_y2);
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cairo_private void
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_cairo_gl_composite_flush (cairo_gl_context_t *ctx);
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cairo_private void
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_cairo_gl_context_destroy_operand (cairo_gl_context_t *ctx,
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cairo_gl_tex_t tex_unit);
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cairo_private cairo_bool_t
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_cairo_gl_get_image_format_and_type (pixman_format_code_t pixman_format,
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GLenum *internal_format, GLenum *format,
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GLenum *type, cairo_bool_t *has_alpha);
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cairo_private void
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_cairo_gl_surface_scaled_font_fini ( cairo_scaled_font_t *scaled_font);
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cairo_private void
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_cairo_gl_surface_scaled_glyph_fini (cairo_scaled_glyph_t *scaled_glyph,
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cairo_scaled_font_t *scaled_font);
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cairo_private void
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_cairo_gl_glyph_cache_init (cairo_gl_glyph_cache_t *cache);
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cairo_private void
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_cairo_gl_glyph_cache_fini (cairo_gl_context_t *ctx,
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cairo_gl_glyph_cache_t *cache);
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cairo_private cairo_int_status_t
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_cairo_gl_surface_show_glyphs (void *abstract_dst,
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cairo_operator_t op,
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const cairo_pattern_t *source,
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cairo_glyph_t *glyphs,
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int num_glyphs,
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cairo_scaled_font_t *scaled_font,
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cairo_clip_t *clip,
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int *remaining_glyphs);
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static inline int
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_cairo_gl_y_flip (cairo_gl_surface_t *surface, int y)
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{
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if (surface->fb)
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return y;
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else
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return (surface->height - 1) - y;
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}
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cairo_private cairo_status_t
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_cairo_gl_context_init_shaders (cairo_gl_context_t *ctx);
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cairo_private void
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_cairo_gl_context_fini_shaders (cairo_gl_context_t *ctx);
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static cairo_always_inline cairo_bool_t
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_cairo_gl_context_is_flushed (cairo_gl_context_t *ctx)
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{
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return ctx->vb == NULL;
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}
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cairo_private cairo_status_t
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_cairo_gl_get_shader_by_type (cairo_gl_context_t *ctx,
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cairo_gl_operand_type_t source,
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cairo_gl_operand_type_t mask,
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cairo_gl_shader_in_t in,
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cairo_gl_shader_t **shader);
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cairo_private void
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_cairo_gl_shader_bind_float (cairo_gl_context_t *ctx,
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const char *name,
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float value);
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cairo_private void
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_cairo_gl_shader_bind_vec2 (cairo_gl_context_t *ctx,
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const char *name,
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float value0, float value1);
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cairo_private void
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_cairo_gl_shader_bind_vec3 (cairo_gl_context_t *ctx,
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const char *name,
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float value0,
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float value1,
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float value2);
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cairo_private void
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_cairo_gl_shader_bind_vec4 (cairo_gl_context_t *ctx,
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const char *name,
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float value0, float value1,
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float value2, float value3);
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cairo_private void
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_cairo_gl_shader_bind_matrix (cairo_gl_context_t *ctx,
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const char *name,
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cairo_matrix_t* m);
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cairo_private void
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_cairo_gl_shader_bind_texture (cairo_gl_context_t *ctx,
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const char *name,
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GLuint tex_unit);
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cairo_private void
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_cairo_gl_set_shader (cairo_gl_context_t *ctx,
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cairo_gl_shader_t *shader);
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cairo_private void
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_cairo_gl_shader_fini (cairo_gl_context_t *ctx, cairo_gl_shader_t *shader);
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slim_hidden_proto (cairo_gl_surface_create);
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slim_hidden_proto (cairo_gl_surface_create_for_texture);
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#endif /* CAIRO_GL_PRIVATE_H */
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