1 /* === S Y N F I G ========================================================= */
2 /*! \file synfig/rendering/opengl/internal/antialiasing.cpp
3 ** \brief Antialiasing
4 **
5 ** $Id$
6 **
7 ** \legal
8 ** ......... ... 2015 Ivan Mahonin
9 **
10 ** This package is free software; you can redistribute it and/or
11 ** modify it under the terms of the GNU General Public License as
12 ** published by the Free Software Foundation; either version 2 of
13 ** the License, or (at your option) any later version.
14 **
15 ** This package is distributed in the hope that it will be useful,
16 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ** General Public License for more details.
19 ** \endlegal
20 */
21 /* ========================================================================= */
22
23 /* === H E A D E R S ======================================================= */
24
25 #ifdef USING_PCH
26 # include "pch.h"
27 #else
28 #ifdef HAVE_CONFIG_H
29 # include <config.h>
30 #endif
31
32 #ifndef _WIN32
33 #include <unistd.h>
34 #include <sys/types.h>
35 #include <signal.h>
36 #endif
37
38 #include <cstring>
39
40 #include <synfig/general.h>
41 #include <synfig/localization.h>
42
43 #include "antialiasing.h"
44
45 #endif
46
47 using namespace synfig;
48 using namespace rendering;
49
50 /* === M A C R O S ========================================================= */
51
52 /* === G L O B A L S ======================================================= */
53
54 /* === P R O C E D U R E S ================================================= */
55
56 /* === M E T H O D S ======================================================= */
57
Antialiasing(Context & context)58 gl::Antialiasing::Antialiasing(Context &context):
59 context(context),
60 allowed(false),
61 multisample_max_width(),
62 multisample_max_height(),
63 multisample_texture_id(),
64 multisample_renderbuffer_id(),
65 multisample_framebuffer_id(),
66 multisample_orig_draw_framebuffer_id()
67 {
68 memset(multisample_viewport, 0, sizeof(multisample_viewport));
69 memset(multisample_orig_viewport, 0, sizeof(multisample_orig_viewport));
70
71 Context::Lock lock(context);
72
73 // options
74
75 multisample_max_width = 1024;
76 multisample_max_height = 1024;
77 int multisample_samples = 8;
78 bool multisample_hdr = true;
79 GLenum multisample_internal_format = multisample_hdr ? GL_RGBA16F : GL_RGBA;
80
81 // multisample
82
83 GLuint prev_draw_framebuffer_id = 0;
84 glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&prev_draw_framebuffer_id);
85
86 glGenTextures(1, &multisample_texture_id);
87 glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, multisample_texture_id);
88 glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, multisample_samples, multisample_internal_format, multisample_max_width, multisample_max_height, GL_TRUE);
89 glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
90
91 glGenRenderbuffers(1, &multisample_renderbuffer_id);
92 glBindRenderbuffer(GL_RENDERBUFFER, multisample_renderbuffer_id);
93 glRenderbufferStorageMultisample(GL_RENDERBUFFER, multisample_samples, GL_STENCIL_INDEX8, multisample_max_width, multisample_max_height);
94 glBindRenderbuffer(GL_RENDERBUFFER, 0);
95
96 glGenFramebuffers(1, &multisample_framebuffer_id);
97 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_framebuffer_id);
98 glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, multisample_renderbuffer_id);
99 glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, multisample_texture_id, 0);
100
101 GLenum multisample_status = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
102 if (multisample_status != GL_FRAMEBUFFER_COMPLETE)
103 warning("multisample framebuffer incomplete 0x%x", multisample_status);
104 else
105 allowed = true;
106
107 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, prev_draw_framebuffer_id);
108
109 context.check();
110 }
111
~Antialiasing()112 gl::Antialiasing::~Antialiasing()
113 {
114 Context::Lock lock(context);
115 glDeleteFramebuffers(1, &multisample_framebuffer_id);
116 glDeleteRenderbuffers(1, &multisample_renderbuffer_id);
117 glDeleteTextures(1, &multisample_texture_id);
118 }
119
120 void
multisample_begin(bool clear)121 gl::Antialiasing::multisample_begin(bool clear)
122 {
123 Context::Lock lock(context);
124 if (is_allowed()) {
125 glGetIntegerv(GL_VIEWPORT, multisample_orig_viewport);
126 multisample_viewport[2] = std::min(multisample_orig_viewport[2], multisample_max_width);
127 multisample_viewport[3] = std::min(multisample_orig_viewport[3], multisample_max_height);
128 glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&multisample_orig_draw_framebuffer_id);
129 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisample_framebuffer_id);
130 glViewport(
131 multisample_viewport[0],
132 multisample_viewport[1],
133 multisample_viewport[2],
134 multisample_viewport[3] );
135 }
136 if (clear) glClear(GL_COLOR_BUFFER_BIT);
137 }
138
139 void
multisample_end()140 gl::Antialiasing::multisample_end()
141 {
142 Context::Lock lock(context);
143 if (is_allowed()) {
144 GLuint prev_read_framebuffer_id = 0;
145 glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, (GLint*)&prev_read_framebuffer_id);
146 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, (GLuint)multisample_orig_draw_framebuffer_id);
147 glBindFramebuffer(GL_READ_FRAMEBUFFER, (GLuint)multisample_framebuffer_id);
148 glBlitFramebuffer(
149 multisample_viewport[0],
150 multisample_viewport[1],
151 multisample_viewport[2],
152 multisample_viewport[3],
153 multisample_orig_viewport[0],
154 multisample_orig_viewport[1],
155 multisample_orig_viewport[2],
156 multisample_orig_viewport[3],
157 GL_COLOR_BUFFER_BIT, GL_LINEAR );
158 glBindFramebuffer(GL_READ_FRAMEBUFFER, prev_read_framebuffer_id);
159 glViewport(
160 multisample_orig_viewport[0],
161 multisample_orig_viewport[1],
162 multisample_orig_viewport[2],
163 multisample_orig_viewport[3] );
164 }
165 }
166
167 /* === E N T R Y P O I N T ================================================= */
168