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|
use bitflags::bitflags;
use crate::CurrentContextWithFns;
use crate::data_types::{Dimens, Vec2};
/// Sets the viewport.
///
/// The `u32` values in `position` and `size` must fit in `i32`s.
///
/// # Errors
/// Returns `Err` if any value in `position` or `size` does not fit into a `i32`.
pub fn set_viewport(
current_context: &CurrentContextWithFns<'_>,
position: &Vec2<u32>,
size: &Dimens<u32>,
) -> Result<(), SetViewportError>
{
let position = Vec2::<crate::sys::types::GLint> {
x: position.x.try_into().map_err(|_| {
SetViewportError::PositionXValueTooLarge {
value: position.x,
max_value: crate::sys::types::GLint::MAX as u32,
}
})?,
y: position.y.try_into().map_err(|_| {
SetViewportError::PositionYValueTooLarge {
value: position.y,
max_value: crate::sys::types::GLint::MAX as u32,
}
})?,
};
let size = Dimens::<crate::sys::types::GLsizei> {
width: size.width.try_into().map_err(|_| {
SetViewportError::SizeWidthValueTooLarge {
value: size.width,
max_value: crate::sys::types::GLsizei::MAX as u32,
}
})?,
height: size.height.try_into().map_err(|_| {
SetViewportError::SizeHeightValueTooLarge {
value: size.height,
max_value: crate::sys::types::GLsizei::MAX as u32,
}
})?,
};
unsafe {
current_context
.fns()
.Viewport(position.x, position.y, size.width, size.height);
}
Ok(())
}
pub fn get_viewport(
current_context: &CurrentContextWithFns<'_>,
) -> (Vec2<u32>, Dimens<u32>)
{
let mut values = [0i32; 4];
unsafe {
current_context
.fns()
.GetIntegerv(crate::sys::VIEWPORT, values.as_mut_ptr());
}
let [x, y, width, height] = values;
let pos = Vec2::<u32> {
x: x.try_into().expect("Negative viewport x coordinate"),
y: y.try_into().expect("Negative viewport y coordinate"),
};
let size = Dimens::<u32> {
width: width.try_into().expect("Negative viewport width"),
height: height.try_into().expect("Negative viewport height"),
};
(pos, size)
}
pub fn clear_buffers(current_context: &CurrentContextWithFns<'_>, mask: BufferClearMask)
{
unsafe {
current_context.fns().Clear(mask.bits());
}
}
pub fn set_polygon_mode(
current_context: &CurrentContextWithFns<'_>,
face: impl Into<PolygonModeFace>,
mode: impl Into<PolygonMode>,
)
{
unsafe {
current_context
.fns()
.PolygonMode(face.into() as u32, mode.into() as u32);
}
}
pub fn enable(current_context: &CurrentContextWithFns<'_>, capacity: Capability)
{
unsafe {
current_context.fns().Enable(capacity as u32);
}
}
pub fn disable(current_context: &CurrentContextWithFns<'_>, capability: Capability)
{
unsafe {
current_context.fns().Disable(capability as u32);
}
}
pub fn set_enabled(
current_context: &CurrentContextWithFns<'_>,
capability: Capability,
enabled: bool,
)
{
if enabled {
enable(current_context, capability);
} else {
disable(current_context, capability);
}
}
#[must_use]
pub fn get_context_flags(current_context: &CurrentContextWithFns<'_>) -> ContextFlags
{
let mut context_flags = crate::sys::types::GLint::default();
unsafe {
current_context
.fns()
.GetIntegerv(crate::sys::CONTEXT_FLAGS, &raw mut context_flags);
}
ContextFlags::from_bits_truncate(context_flags.cast_unsigned())
}
/// Defines a rectangle, called the scissor box, in window coordinates.
pub fn define_scissor_box(
current_context: &CurrentContextWithFns<'_>,
lower_left_corner_pos: Vec2<u16>,
size: Dimens<u16>,
)
{
let lower_left_corner_pos = Vec2::<crate::sys::types::GLint> {
x: lower_left_corner_pos.x.into(),
y: lower_left_corner_pos.y.into(),
};
let size = Dimens::<crate::sys::types::GLsizei> {
width: size.width.into(),
height: size.height.into(),
};
unsafe {
current_context.fns().Scissor(
lower_left_corner_pos.x,
lower_left_corner_pos.y,
size.width,
size.height,
);
}
}
bitflags! {
#[derive(Debug, Clone, Copy)]
pub struct BufferClearMask: u32 {
const COLOR = crate::sys::COLOR_BUFFER_BIT;
const DEPTH = crate::sys::DEPTH_BUFFER_BIT;
const STENCIL = crate::sys::STENCIL_BUFFER_BIT;
}
}
#[derive(Debug, Clone, Copy)]
#[repr(u32)]
#[non_exhaustive]
pub enum Capability
{
DepthTest = crate::sys::DEPTH_TEST,
ScissorTest = crate::sys::SCISSOR_TEST,
MultiSample = crate::sys::MULTISAMPLE,
DebugOutput = crate::sys::DEBUG_OUTPUT,
DebugOutputSynchronous = crate::sys::DEBUG_OUTPUT_SYNCHRONOUS,
Blend = crate::sys::BLEND,
CullFace = crate::sys::CULL_FACE,
}
#[derive(Debug)]
#[repr(u32)]
pub enum PolygonMode
{
Point = crate::sys::POINT,
Line = crate::sys::LINE,
Fill = crate::sys::FILL,
}
#[derive(Debug)]
#[repr(u32)]
pub enum PolygonModeFace
{
Front = crate::sys::FRONT,
Back = crate::sys::BACK,
FrontAndBack = crate::sys::FRONT_AND_BACK,
}
bitflags! {
#[derive(Debug, Clone, Copy)]
pub struct ContextFlags: u32 {
const FORWARD_COMPATIBLE = crate::sys::CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
const DEBUG = crate::sys::CONTEXT_FLAG_DEBUG_BIT;
const ROBUST_ACCESS = crate::sys::CONTEXT_FLAG_ROBUST_ACCESS_BIT;
}
}
#[derive(Debug, thiserror::Error)]
pub enum SetViewportError
{
#[error("Position X value ({value}) is too large. Must be < {max_value}")]
PositionXValueTooLarge
{
value: u32, max_value: u32
},
#[error("Position Y value ({value}) is too large. Must be < {max_value}")]
PositionYValueTooLarge
{
value: u32, max_value: u32
},
#[error("Size width value ({value}) is too large. Must be < {max_value}")]
SizeWidthValueTooLarge
{
value: u32, max_value: u32
},
#[error("Size height value ({value}) is too large. Must be < {max_value}")]
SizeHeightValueTooLarge
{
value: u32, max_value: u32
},
}
|
