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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
use std::collections::HashSet;
use std::{ffi, fmt, mem, str};
use gl;
use gfx_core::Capabilities;
#[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd)]
pub struct Version {
pub major: u32,
pub minor: u32,
pub revision: Option<u32>,
pub vendor_info: &'static str,
}
impl Version {
pub fn new(major: u32, minor: u32, revision: Option<u32>,
vendor_info: &'static str) -> Version {
Version {
major: major,
minor: minor,
revision: revision,
vendor_info: vendor_info,
}
}
pub fn parse(src: &'static str) -> Result<Version, &'static str> {
let (version, vendor_info) = match src.find(' ') {
Some(i) => (&src[..i], &src[(i + 1)..]),
None => (src, ""),
};
let mut it = version.split('.');
let major = it.next().and_then(|s| s.parse().ok());
let minor = it.next().and_then(|s| s.parse().ok());
let revision = it.next().and_then(|s| s.parse().ok());
match (major, minor, revision) {
(Some(major), Some(minor), revision) => Ok(Version {
major: major,
minor: minor,
revision: revision,
vendor_info: vendor_info,
}),
(_, _, _) => Err(src),
}
}
}
impl fmt::Debug for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match (self.major, self.minor, self.revision, self.vendor_info) {
(major, minor, Some(revision), "") =>
write!(f, "{}.{}.{}", major, minor, revision),
(major, minor, None, "") =>
write!(f, "{}.{}", major, minor),
(major, minor, Some(revision), vendor_info) =>
write!(f, "{}.{}.{}, {}", major, minor, revision, vendor_info),
(major, minor, None, vendor_info) =>
write!(f, "{}.{}, {}", major, minor, vendor_info),
}
}
}
const EMPTY_STRING: &'static str = "";
fn get_string(gl: &gl::Gl, name: gl::types::GLenum) -> &'static str {
let ptr = unsafe { gl.GetString(name) } as *const i8;
if !ptr.is_null() {
unsafe { c_str_as_static_str(ptr) }
} else {
error!("Invalid GLenum passed to `get_string`: {:x}", name);
EMPTY_STRING
}
}
fn get_usize(gl: &gl::Gl, name: gl::types::GLenum) -> usize {
let mut value = 0 as gl::types::GLint;
unsafe { gl.GetIntegerv(name, &mut value) };
value as usize
}
unsafe fn c_str_as_static_str(c_str: *const i8) -> &'static str {
mem::transmute(str::from_utf8(ffi::CStr::from_ptr(c_str as *const _).to_bytes()).unwrap())
}
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub struct PlatformName {
pub vendor: &'static str,
pub renderer: &'static str,
}
impl PlatformName {
fn get(gl: &gl::Gl) -> PlatformName {
PlatformName {
vendor: get_string(gl, gl::VENDOR),
renderer: get_string(gl, gl::RENDERER),
}
}
}
#[derive(Debug)]
pub struct PrivateCaps {
pub array_buffer_supported: bool,
pub frame_buffer_supported: bool,
pub immutable_storage_supported: bool,
pub sampler_objects_supported: bool,
}
#[derive(Debug)]
pub struct Info {
pub platform_name: PlatformName,
pub version: Version,
pub shading_language: Version,
pub extensions: HashSet<&'static str>,
}
impl Info {
fn get(gl: &gl::Gl) -> Info {
let platform_name = PlatformName::get(gl);
let version = Version::parse(get_string(gl, gl::VERSION)).unwrap();
let shading_language = Version::parse(get_string(gl, gl::SHADING_LANGUAGE_VERSION)).unwrap();
let extensions = if version >= Version::new(3, 0, None, "") {
let num_exts = get_usize(gl, gl::NUM_EXTENSIONS) as gl::types::GLuint;
(0..num_exts)
.map(|i| unsafe { c_str_as_static_str(gl.GetStringi(gl::EXTENSIONS, i) as *const i8) })
.collect()
} else {
get_string(gl, gl::EXTENSIONS).split(' ').collect()
};
Info {
platform_name: platform_name,
version: version,
shading_language: shading_language,
extensions: extensions,
}
}
pub fn is_version_supported(&self, major: u32, minor: u32) -> bool {
self.version >= Version::new(major, minor, None, "")
}
pub fn is_extension_supported(&self, s: &'static str) -> bool {
self.extensions.contains(&s)
}
pub fn is_version_or_extension_supported(&self, major: u32, minor: u32, ext: &'static str) -> bool {
self.is_version_supported(major, minor) || self.is_extension_supported(ext)
}
}
pub fn get(gl: &gl::Gl) -> (Info, Capabilities, PrivateCaps) {
let info = Info::get(gl);
let caps = Capabilities {
max_vertex_count: get_usize(gl, gl::MAX_ELEMENTS_VERTICES),
max_index_count: get_usize(gl, gl::MAX_ELEMENTS_INDICES),
max_texture_size: get_usize(gl, gl::MAX_TEXTURE_SIZE),
instance_base_supported: info.is_version_or_extension_supported(4, 2, "GL_ARB_base_instance"),
instance_call_supported: info.is_version_or_extension_supported(3, 1, "GL_ARB_draw_instanced"),
instance_rate_supported: info.is_version_or_extension_supported(3, 3, "GL_ARB_instanced_arrays"),
vertex_base_supported: info.is_version_or_extension_supported(3, 2, "GL_ARB_draw_elements_base_vertex"),
srgb_color_supported: info.is_version_or_extension_supported(3, 2, "GL_ARB_framebuffer_sRGB"),
constant_buffer_supported: info.is_version_or_extension_supported(3, 0, "GL_ARB_uniform_buffer_object"),
unordered_access_view_supported: info.is_version_or_extension_supported(4, 0, "XXX"),
separate_blending_slots_supported: info.is_version_or_extension_supported(4, 0, "GL_ARB_draw_buffers_blend"),
};
let private = PrivateCaps {
array_buffer_supported: info.is_version_or_extension_supported(3, 0, "GL_ARB_vertex_array_object"),
frame_buffer_supported: info.is_version_or_extension_supported(3, 0, "GL_ARB_framebuffer_object"),
immutable_storage_supported: info.is_version_or_extension_supported(4, 2, "GL_ARB_texture_storage"),
sampler_objects_supported: info.is_version_or_extension_supported(3, 3, "GL_ARB_sampler_objects"),
};
(info, caps, private)
}
#[cfg(test)]
mod tests {
use super::Version;
use super::to_shader_model;
#[test]
fn test_version_parse() {
assert_eq!(Version::parse("1"), Err("1"));
assert_eq!(Version::parse("1."), Err("1."));
assert_eq!(Version::parse("1 h3l1o. W0rld"), Err("1 h3l1o. W0rld"));
assert_eq!(Version::parse("1. h3l1o. W0rld"), Err("1. h3l1o. W0rld"));
assert_eq!(Version::parse("1.2.3"), Ok(Version::new(1, 2, Some(3), "")));
assert_eq!(Version::parse("1.2"), Ok(Version::new(1, 2, None, "")));
assert_eq!(Version::parse("1.2 h3l1o. W0rld"), Ok(Version::new(1, 2, None, "h3l1o. W0rld")));
assert_eq!(Version::parse("1.2.h3l1o. W0rld"), Ok(Version::new(1, 2, None, "W0rld")));
assert_eq!(Version::parse("1.2. h3l1o. W0rld"), Ok(Version::new(1, 2, None, "h3l1o. W0rld")));
assert_eq!(Version::parse("1.2.3.h3l1o. W0rld"), Ok(Version::new(1, 2, Some(3), "W0rld")));
assert_eq!(Version::parse("1.2.3 h3l1o. W0rld"), Ok(Version::new(1, 2, Some(3), "h3l1o. W0rld")));
}
#[test]
fn test_shader_model() {
use gfx_core::shade::ShaderModel;
assert_eq!(to_shader_model(&Version::parse("1.10").unwrap()), ShaderModel::Unsupported);
assert_eq!(to_shader_model(&Version::parse("1.20").unwrap()), ShaderModel::Version30);
assert_eq!(to_shader_model(&Version::parse("1.50").unwrap()), ShaderModel::Version40);
assert_eq!(to_shader_model(&Version::parse("3.00").unwrap()), ShaderModel::Version41);
assert_eq!(to_shader_model(&Version::parse("4.30").unwrap()), ShaderModel::Version50);
}
}