1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
#![cfg(all(target_os = "linux", feature = "window"))]
use BuilderAttribs;
use CreationError;
use GlContext;
use GlProfile;
use GlRequest;
use Api;
use PixelFormat;
use libc;
use std::ffi::CString;
use std::{mem, ptr};
use api::x11::ffi;
pub struct Context {
display: *mut ffi::Display,
window: ffi::Window,
context: ffi::GLXContext,
}
// TODO: remove me
fn with_c_str<F, T>(s: &str, f: F) -> T where F: FnOnce(*const libc::c_char) -> T {
use std::ffi::CString;
let c_str = CString::new(s.as_bytes().to_vec()).unwrap();
f(c_str.as_ptr())
}
impl Context {
pub fn new(builder: BuilderAttribs, display: *mut ffi::Display, window: ffi::Window,
fb_config: ffi::glx::types::GLXFBConfig, mut visual_infos: ffi::glx::types::XVisualInfo)
-> Result<Context, CreationError>
{
// creating GL context
let (context, extra_functions) = unsafe {
let mut attributes = Vec::new();
match builder.gl_version {
GlRequest::Latest => {},
GlRequest::Specific(Api::OpenGl, (major, minor)) => {
attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
GlRequest::Specific(_, _) => panic!("Only OpenGL is supported"),
GlRequest::GlThenGles { opengl_version: (major, minor), .. } => {
attributes.push(ffi::glx_extra::CONTEXT_MAJOR_VERSION_ARB as libc::c_int);
attributes.push(major as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_MINOR_VERSION_ARB as libc::c_int);
attributes.push(minor as libc::c_int);
},
}
if let Some(profile) = builder.gl_profile {
let flag = match profile {
GlProfile::Compatibility =>
ffi::glx_extra::CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
GlProfile::Core =>
ffi::glx_extra::CONTEXT_CORE_PROFILE_BIT_ARB,
};
attributes.push(ffi::glx_extra::CONTEXT_PROFILE_MASK_ARB as libc::c_int);
attributes.push(flag as libc::c_int);
}
if builder.gl_debug {
attributes.push(ffi::glx_extra::CONTEXT_FLAGS_ARB as libc::c_int);
attributes.push(ffi::glx_extra::CONTEXT_DEBUG_BIT_ARB as libc::c_int);
}
attributes.push(0);
// loading the extra GLX functions
let extra_functions = ffi::glx_extra::Glx::load_with(|addr| {
with_c_str(addr, |s| {
ffi::glx::GetProcAddress(s as *const u8) as *const libc::c_void
})
});
let share = if let Some(win) = builder.sharing {
match win.x.context {
::api::x11::Context::Glx(ref c) => c.context,
_ => panic!("Cannot share contexts between different APIs")
}
} else {
ptr::null()
};
let mut context = if extra_functions.CreateContextAttribsARB.is_loaded() {
extra_functions.CreateContextAttribsARB(display as *mut ffi::glx_extra::types::Display,
fb_config, share, 1, attributes.as_ptr())
} else {
ptr::null()
};
if context.is_null() {
context = ffi::glx::CreateContext(display as *mut _, &mut visual_infos, share, 1)
}
if context.is_null() {
return Err(CreationError::OsError(format!("GL context creation failed")));
}
(context, extra_functions)
};
// vsync
if builder.vsync {
unsafe { ffi::glx::MakeCurrent(display as *mut _, window, context) };
if extra_functions.SwapIntervalEXT.is_loaded() {
// this should be the most common extension
unsafe {
extra_functions.SwapIntervalEXT(display as *mut _, window, 1);
}
// checking that it worked
if builder.strict {
let mut swap = unsafe { mem::uninitialized() };
unsafe {
ffi::glx::QueryDrawable(display as *mut _, window,
ffi::glx_extra::SWAP_INTERVAL_EXT as i32,
&mut swap);
}
if swap != 1 {
return Err(CreationError::OsError(format!("Couldn't setup vsync: expected \
interval `1` but got `{}`", swap)));
}
}
// GLX_MESA_swap_control is not official
/*} else if extra_functions.SwapIntervalMESA.is_loaded() {
unsafe {
extra_functions.SwapIntervalMESA(1);
}*/
} else if extra_functions.SwapIntervalSGI.is_loaded() {
unsafe {
extra_functions.SwapIntervalSGI(1);
}
} else if builder.strict {
return Err(CreationError::OsError(format!("Couldn't find any available vsync extension")));
}
unsafe { ffi::glx::MakeCurrent(display as *mut _, 0, ptr::null()) };
}
Ok(Context {
display: display,
window: window,
context: context,
})
}
}
impl GlContext for Context {
unsafe fn make_current(&self) {
let res = ffi::glx::MakeCurrent(self.display as *mut _, self.window, self.context);
if res == 0 {
panic!("glx::MakeCurrent failed");
}
}
fn is_current(&self) -> bool {
unsafe { ffi::glx::GetCurrentContext() == self.context }
}
fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
unsafe {
ffi::glx::GetProcAddress(addr as *const _) as *const _
}
}
fn swap_buffers(&self) {
unsafe {
ffi::glx::SwapBuffers(self.display as *mut _, self.window)
}
}
fn get_api(&self) -> ::Api {
::Api::OpenGl
}
fn get_pixel_format(&self) -> PixelFormat {
unimplemented!();
}
}
unsafe impl Send for Context {}
unsafe impl Sync for Context {}
impl Drop for Context {
fn drop(&mut self) {
unsafe {
// we don't call MakeCurrent(0, 0) because we are not sure that the context
// is still the current one
ffi::glx::DestroyContext(self.display as *mut _, self.context);
}
}
}
|
