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Add imgui-glow-renderer from test repo

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John-Mark Allen 2021-06-09 22:29:24 +01:00 committed by Jack Spira
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1
Cargo.toml
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@ -4,6 +4,7 @@ members = [
"imgui-sys", "imgui-sys",
"imgui-gfx-renderer", "imgui-gfx-renderer",
"imgui-glium-renderer", "imgui-glium-renderer",
"imgui-glow-renderer",
"imgui-winit-support", "imgui-winit-support",
"imgui-examples", "imgui-examples",
"imgui-gfx-examples", "imgui-gfx-examples",

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imgui-glow-renderer/Cargo.toml Normal file
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[package]
name = "imgui-glow-renderer"
version = "0.7.0"
edition = "2018"
authors = ["The imgui-rs Developers"]
description = "glow renderer for the imgui crate"
homepage = "https://github.com/imgui-rs/imgui-rs"
repository = "https://github.com/imgui-rs/imgui-rs"
license = "MIT/Apache-2.0"
categories = ["gui", "rendering"]
[dependencies]
imgui = { version = "0.7.0", path = "../imgui" }
glow = "0.10.0"
memoffset = "0.6.4"
[dev-dependencies]
glutin = "0.26.0"
imgui-winit-support = { version = "0.7.1", path = "../imgui-winit-support" }
[features]
# Features here are used to opt-out of compiling code that depends on certain
# OpenGL features. If the features are enabled, the renderer will check that the
# feature is supported before attempting to use it. Only opt-out of any of these
# if you are certain you will only target platforms that lack the corresponding
# feature.
default = [
"gl_extensions_support",
"bind_vertex_array_support",
"vertex_offset_support",
"clip_origin_support",
"bind_sampler_support",
"polygon_mode_support",
"primitive_restart_support",
]
# Enable checking for OpenGL extensions
gl_extensions_support = []
# Support for `glBindVertexArray`
bind_vertex_array_support = []
# Support for `glDrawElementsBaseVertex`
vertex_offset_support = []
# Support for `GL_CLIP_ORIGIN`
clip_origin_support = []
# Support for `glBindSampler`
bind_sampler_support = []
# Support for `glPolygonMode`
polygon_mode_support = []
# Support for `GL_PRIMITIVE_RESTART`
primitive_restart_support = []

202
imgui-glow-renderer/LICENSE-APACHE Normal file
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imgui-glow-renderer/LICENSE-MIT Normal file
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Copyright (c) 2015-2020 The imgui-rs Developers
Permission is hereby granted, free of charge, to any person obtaining a copy
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

116
imgui-glow-renderer/examples/basic.rs Normal file
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//! A basic self-contained example to get you from zero-to-demo-window as fast
//! as possible.
use std::time::Instant;
use glow::HasContext;
use glutin::{event_loop::EventLoop, WindowedContext};
use imgui_winit_support::WinitPlatform;
const TITLE: &str = "Hello, imgui-rs!";
type Window = WindowedContext<glutin::PossiblyCurrent>;
fn main() {
// Common setup for creating a winit window and imgui context, not specifc
// to this renderer at all ecept that glutin is used to create the window
// since it will give us access to a GL context
let (event_loop, window) = create_window();
let (mut winit_platform, mut imgui_context) = imgui_init(&window);
// OpenGL context from glow
let gl = glow_context(&window);
unsafe { gl.clear_color(0.05, 0.05, 0.1, 1.0) };
// OpenGL renderer from this crate
let mut ig_renderer = imgui_glow_renderer::auto_renderer(gl, &mut imgui_context)
.expect("failed to create renderer");
// Standard winit event loop
let mut last_frame = Instant::now();
event_loop.run(move |event, _, control_flow| {
*control_flow = glutin::event_loop::ControlFlow::Wait;
match event {
glutin::event::Event::NewEvents(_) => {
let now = Instant::now();
imgui_context
.io_mut()
.update_delta_time(now.duration_since(last_frame));
last_frame = now;
}
glutin::event::Event::MainEventsCleared => {
winit_platform
.prepare_frame(imgui_context.io_mut(), window.window())
.unwrap();
window.window().request_redraw();
}
glutin::event::Event::RedrawRequested(_) => {
// The renderer assumes you'll be clearing the buffer yourself
unsafe { ig_renderer.gl_context().clear(glow::COLOR_BUFFER_BIT) };
let ui = imgui_context.frame();
ui.show_demo_window(&mut true);
winit_platform.prepare_render(&ui, window.window());
let draw_data = ui.render();
// This is the only extra render step to add
ig_renderer
.render(&draw_data)
.expect("error rendering imgui");
window.swap_buffers().unwrap();
}
glutin::event::Event::WindowEvent {
event: glutin::event::WindowEvent::CloseRequested,
..
} => {
*control_flow = glutin::event_loop::ControlFlow::Exit;
}
event => {
winit_platform.handle_event(imgui_context.io_mut(), window.window(), &event);
}
}
});
}
fn create_window() -> (EventLoop<()>, Window) {
let event_loop = glutin::event_loop::EventLoop::new();
let window = glutin::window::WindowBuilder::new()
.with_title(TITLE)
.with_inner_size(glutin::dpi::LogicalSize::new(1024, 768));
let window = glutin::ContextBuilder::new()
.with_vsync(true)
.build_windowed(window, &event_loop)
.expect("could not create window");
let window = unsafe {
window
.make_current()
.expect("could not make window context current")
};
(event_loop, window)
}
fn glow_context(window: &Window) -> glow::Context {
unsafe { glow::Context::from_loader_function(|s| window.get_proc_address(s).cast()) }
}
fn imgui_init(window: &Window) -> (WinitPlatform, imgui::Context) {
let mut imgui_context = imgui::Context::create();
imgui_context.set_ini_filename(None);
let mut winit_platform = WinitPlatform::init(&mut imgui_context);
winit_platform.attach_window(
imgui_context.io_mut(),
window.window(),
imgui_winit_support::HiDpiMode::Rounded,
);
imgui_context
.fonts()
.add_font(&[imgui::FontSource::DefaultFontData { config: None }]);
imgui_context.io_mut().font_global_scale = (1.0 / winit_platform.hidpi_factor()) as f32;
(winit_platform, imgui_context)
}

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#![allow(clippy::must_use_candidate)]
#[derive(PartialEq, Clone, Copy)]
pub struct GlVersion {
pub major: u16,
pub minor: u16,
pub is_gles: bool,
}
impl GlVersion {
pub const fn gl(major: u16, minor: u16) -> Self {
Self {
major,
minor,
is_gles: false,
}
}
pub const fn gles(major: u16, minor: u16) -> Self {
Self {
major,
minor,
is_gles: true,
}
}
pub fn read<G: glow::HasContext>(gl: &G) -> Self {
Self::parse(&unsafe { gl.get_parameter_string(glow::VERSION) })
}
/// Parse the OpenGL version from the version string queried from the driver
/// via the `GL_VERSION` enum.
///
/// Version strings are documented to be in the form
/// `<major>.<minor>[.<release>][ <vendor specific information>]`
/// for full-fat OpenGL, and
/// `OpenGL ES <major>.<minor>[.<release>][ <vendor specific information>]`
/// for OpenGL ES.
///
/// Examples based on strings found in the wild:
/// ```rust
/// # use glow_renderer::GlVersion;
/// let version = GlVersion::parse("4.6.0 NVIDIA 465.27");
/// assert!(!version.is_gles);
/// assert_eq!(version.major, 4);
/// assert_eq!(version.minor, 6);
/// let version = GlVersion::parse("OpenGL ES 3.2 NVIDIA 465.27");
/// assert!(version.is_gles);
/// assert_eq!(version.major, 3);
/// assert_eq!(version.minor, 2);
/// ```
pub fn parse(gl_version_string: &str) -> Self {
let (version_string, is_gles) = gl_version_string
.strip_prefix("OpenGL ES ")
.map_or_else(|| (gl_version_string, false), |version| (version, true));
let mut parts = version_string.split(|c: char| !c.is_numeric());
let major = parts.next().unwrap_or("0").parse().unwrap_or(0);
let minor = parts.next().unwrap_or("0").parse().unwrap_or(0);
Self {
major,
minor,
is_gles,
}
}
/// Vertex array binding is provided by `glBindVertexArray`, which is
/// not present in OpenGL (ES) <3.0
#[cfg(feature = "bind_vertex_array_support")]
pub fn bind_vertex_array_support(self) -> bool {
self.major >= 3
}
/// Vertex offset support is provided by `glDrawElementsBaseVertex`, which is
/// only present from OpenGL 3.2 and above.
#[cfg(feature = "vertex_offset_support")]
pub fn vertex_offset_support(self) -> bool {
!self.is_gles && self >= Self::gl(3, 2)
}
/// Vertex arrays (e.g. `glBindVertexArray`) are supported from OpenGL 3.0
/// and OpenGL ES 3.0
#[cfg(feature = "vertex_array_support")]
pub fn vertex_array_support(self) -> bool {
self >= Self::gl(3, 0) || self >= Self::gles(3, 0)
}
/// Separate binding of sampler (`glBindSampler`) is supported from OpenGL
/// 3.2 or ES 3.0
#[cfg(feature = "bind_sampler_support")]
pub fn bind_sampler_support(self) -> bool {
self >= GlVersion::gl(3, 2) || self >= GlVersion::gles(3, 0)
}
/// Setting the clip origin (`GL_CLIP_ORIGIN`) is suppoted from OpenGL 4.5
#[cfg(feature = "clip_origin_support")]
pub fn clip_origin_support(self) -> bool {
self >= GlVersion::gl(4, 5)
}
#[cfg(feature = "polygon_mode_support")]
pub fn polygon_mode_support(self) -> bool {
!self.is_gles
}
#[cfg(feature = "primitive_restart_support")]
pub fn primitive_restart_support(self) -> bool {
self >= GlVersion::gl(3, 1)
}
}
impl PartialOrd for GlVersion {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
if self.is_gles == other.is_gles {
Some(
self.major
.cmp(&other.major)
.then(self.minor.cmp(&other.minor)),
)
} else {
None
}
}
}
pub struct GlslVersion {
pub major: u16,
pub minor: u16,
pub is_gles: bool,
}
impl GlslVersion {
pub fn read<G: glow::HasContext>(gl: &G) -> Self {
Self::parse(&unsafe { gl.get_parameter_string(glow::SHADING_LANGUAGE_VERSION) })
}
/// Parse the OpenGL version from the version string queried from the driver
/// via the `GL_SHADING_LANGUAGE_VERSION` enum.
///
/// Version strings are documented to be in the form
/// `<major>.<minor>[.<release>][ <vendor specific information>]`
/// for full-fat OpenGL, and
/// `OpenGL ES GLSL ES <major>.<minor>[.<release>][ <vendor specific information>]`
/// for OpenGL ES (however, strings omitting that prefix have been observed).
///
/// Examples based on strings found in the wild:
/// ```rust
/// # use glow_renderer::GlslVersion;
/// let version = GlslVersion::parse("4.60 NVIDIA");
/// assert!(!version.is_gles);
/// assert_eq!(version.major, 4);
/// assert_eq!(version.minor, 6);
/// let version = GlslVersion::parse("OpenGL ES GLSL ES 3.20");
/// assert!(version.is_gles);
/// assert_eq!(version.major, 3);
/// assert_eq!(version.minor, 2);
/// ```
pub fn parse(gl_shading_language_version: &str) -> Self {
let (version_string, is_gles) = gl_shading_language_version
.strip_prefix("OpenGL ES GLSL ES ")
.map_or_else(
|| (gl_shading_language_version, false),
|version| (version, true),
);
let mut parts = version_string.split(|c: char| !c.is_numeric());
let major = parts.next().unwrap_or("0").parse().unwrap_or(0);
let minor = parts.next().unwrap_or("0").parse().unwrap_or(0);
// The minor version has been observed specified as both a single- or
// double-digit version
let minor = if minor >= 10 { minor / 10 } else { minor };
Self {
major,
minor,
is_gles,
}
}
}