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use crate::core::texture::*;
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
///
/// The 6 sides of a cube map
///
pub enum CubeMapSide {
/// Positive y
Top,
/// Negative y
Bottom,
/// Positive x
Right,
/// Negative x
Left,
/// Negative z
Front,
/// Positive z
Back,
}
///
/// Iterator over the 6 side of a cube map.
///
pub struct CubeMapSideIterator {
index: usize,
}
impl CubeMapSideIterator {
///
/// Creates a new iterator over the 6 side of a cube map.
///
pub fn new() -> Self {
Self { index: 0 }
}
}
impl Default for CubeMapSideIterator {
fn default() -> Self {
Self::new()
}
}
impl Iterator for CubeMapSideIterator {
type Item = CubeMapSide;
fn next(&mut self) -> Option<Self::Item> {
self.index += 1;
match self.index {
1 => Some(CubeMapSide::Right),
2 => Some(CubeMapSide::Left),
3 => Some(CubeMapSide::Top),
4 => Some(CubeMapSide::Bottom),
5 => Some(CubeMapSide::Front),
6 => Some(CubeMapSide::Back),
_ => None,
}
}
}
impl CubeMapSide {
///
/// Iterator over the 6 side of a cube map.
///
pub fn iter() -> CubeMapSideIterator {
CubeMapSideIterator::new()
}
pub(in crate::core) fn to_const(self) -> u32 {
match self {
CubeMapSide::Right => crate::context::TEXTURE_CUBE_MAP_POSITIVE_X,
CubeMapSide::Left => crate::context::TEXTURE_CUBE_MAP_NEGATIVE_X,
CubeMapSide::Top => crate::context::TEXTURE_CUBE_MAP_POSITIVE_Y,
CubeMapSide::Bottom => crate::context::TEXTURE_CUBE_MAP_NEGATIVE_Y,
CubeMapSide::Front => crate::context::TEXTURE_CUBE_MAP_POSITIVE_Z,
CubeMapSide::Back => crate::context::TEXTURE_CUBE_MAP_NEGATIVE_Z,
}
}
/// The up direction that should be used when rendering into this cube map side.
pub fn up(&self) -> Vec3 {
match self {
CubeMapSide::Right => vec3(0.0, -1.0, 0.0),
CubeMapSide::Left => vec3(0.0, -1.0, 0.0),
CubeMapSide::Top => vec3(0.0, 0.0, 1.0),
CubeMapSide::Bottom => vec3(0.0, 0.0, -1.0),
CubeMapSide::Front => vec3(0.0, -1.0, 0.0),
CubeMapSide::Back => vec3(0.0, -1.0, 0.0),
}
}
/// The direction from origo towards the center of this cube map side.
pub fn direction(&self) -> Vec3 {
match self {
CubeMapSide::Right => vec3(1.0, 0.0, 0.0),
CubeMapSide::Left => vec3(-1.0, 0.0, 0.0),
CubeMapSide::Top => vec3(0.0, 1.0, 0.0),
CubeMapSide::Bottom => vec3(0.0, -1.0, 0.0),
CubeMapSide::Front => vec3(0.0, 0.0, 1.0),
CubeMapSide::Back => vec3(0.0, 0.0, -1.0),
}
}
}
///
/// A texture that covers all 6 sides of a cube.
///
pub struct TextureCubeMap {
context: Context,
id: crate::context::Texture,
width: u32,
height: u32,
number_of_mip_maps: u32,
data_byte_size: usize,
}
impl TextureCubeMap {
///
/// Creates a new cube map texture from the given [CpuTexture]s.
/// All of the cpu textures must contain data with the same [TextureDataType].
///
/// **Note:** Mip maps will not be generated for RGB16F and RGB32F format, even if `mip_map_filter` is specified.
///
pub fn new(
context: &Context,
right: &CpuTexture,
left: &CpuTexture,
top: &CpuTexture,
bottom: &CpuTexture,
front: &CpuTexture,
back: &CpuTexture,
) -> Self {
match &front.data {
TextureData::RU8(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
ru8_data(right),
ru8_data(left),
ru8_data(top),
ru8_data(bottom),
front_data,
ru8_data(back),
),
TextureData::RgU8(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgu8_data(right),
rgu8_data(left),
rgu8_data(top),
rgu8_data(bottom),
front_data,
rgu8_data(back),
),
TextureData::RgbU8(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbu8_data(right),
rgbu8_data(left),
rgbu8_data(top),
rgbu8_data(bottom),
front_data,
rgbu8_data(back),
),
TextureData::RgbaU8(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbau8_data(right),
rgbau8_data(left),
rgbau8_data(top),
rgbau8_data(bottom),
front_data,
rgbau8_data(back),
),
TextureData::RF16(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rf16_data(right),
rf16_data(left),
rf16_data(top),
rf16_data(bottom),
front_data,
rf16_data(back),
),
TextureData::RgF16(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgf16_data(right),
rgf16_data(left),
rgf16_data(top),
rgf16_data(bottom),
front_data,
rgf16_data(back),
),
TextureData::RgbF16(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbf16_data(right),
rgbf16_data(left),
rgbf16_data(top),
rgbf16_data(bottom),
front_data,
rgbf16_data(back),
),
TextureData::RgbaF16(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbaf16_data(right),
rgbaf16_data(left),
rgbaf16_data(top),
rgbaf16_data(bottom),
front_data,
rgbaf16_data(back),
),
TextureData::RF32(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rf32_data(right),
rf32_data(left),
rf32_data(top),
rf32_data(bottom),
front_data,
rf32_data(back),
),
TextureData::RgF32(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgf32_data(right),
rgf32_data(left),
rgf32_data(top),
rgf32_data(bottom),
front_data,
rgf32_data(back),
),
TextureData::RgbF32(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbf32_data(right),
rgbf32_data(left),
rgbf32_data(top),
rgbf32_data(bottom),
front_data,
rgbf32_data(back),
),
TextureData::RgbaF32(front_data) => Self::new_with_data(
context,
front,
right.wrap_s,
rgbaf32_data(right),
rgbaf32_data(left),
rgbaf32_data(top),
rgbaf32_data(bottom),
front_data,
rgbaf32_data(back),
),
}
}
fn new_with_data<T: TextureDataType>(
context: &Context,
cpu_texture: &CpuTexture,
wrap_r: Wrapping,
right_data: &[T],
left_data: &[T],
top_data: &[T],
bottom_data: &[T],
front_data: &[T],
back_data: &[T],
) -> Self {
let mut texture = Self::new_empty::<T>(
context,
cpu_texture.width,
cpu_texture.height,
cpu_texture.min_filter,
cpu_texture.mag_filter,
cpu_texture.mip_map_filter,
cpu_texture.wrap_s,
cpu_texture.wrap_t,
wrap_r,
);
texture.fill(
right_data,
left_data,
top_data,
bottom_data,
front_data,
back_data,
);
texture
}
///
/// Creates a new texture cube map.
///
/// **Note:** Mip maps will not be generated for RGB16F and RGB32F format, even if `mip_map_filter` is specified.
///
pub fn new_empty<T: TextureDataType>(
context: &Context,
width: u32,
height: u32,
min_filter: Interpolation,
mag_filter: Interpolation,
mip_map_filter: Option<Interpolation>,
wrap_s: Wrapping,
wrap_t: Wrapping,
wrap_r: Wrapping,
) -> Self {
let id = generate(context);
let number_of_mip_maps =
calculate_number_of_mip_maps::<T>(mip_map_filter, width, height, None);
let texture = Self {
context: context.clone(),
id,
width,
height,
number_of_mip_maps,
data_byte_size: std::mem::size_of::<T>(),
};
texture.bind();
set_parameters(
context,
crate::context::TEXTURE_CUBE_MAP,
min_filter,
mag_filter,
if number_of_mip_maps == 1 {
None
} else {
mip_map_filter
},
wrap_s,
wrap_t,
Some(wrap_r),
);
unsafe {
context.tex_storage_2d(
crate::context::TEXTURE_CUBE_MAP,
number_of_mip_maps as i32,
T::internal_format(),
width as i32,
height as i32,
);
}
texture.generate_mip_maps();
texture
}
///
/// Fills the cube map texture with the given pixel data for the 6 images.
///
/// # Panic
/// Will panic if the length of the data for all 6 images does not correspond to the width, height and format specified at construction.
/// It is therefore necessary to create a new texture if the texture size or format has changed.
///
pub fn fill<T: TextureDataType>(
&mut self,
right_data: &[T],
left_data: &[T],
top_data: &[T],
bottom_data: &[T],
front_data: &[T],
back_data: &[T],
) {
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
right_data.len(),
);
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
left_data.len(),
);
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
top_data.len(),
);
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
bottom_data.len(),
);
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
front_data.len(),
);
check_data_length::<T>(
self.width,
self.height,
1,
self.data_byte_size,
back_data.len(),
);
self.bind();
for i in 0..6 {
let data = match i {
0 => right_data,
1 => left_data,
2 => top_data,
3 => bottom_data,
4 => front_data,
5 => back_data,
_ => unreachable!(),
};
unsafe {
self.context.tex_sub_image_2d(
crate::context::TEXTURE_CUBE_MAP_POSITIVE_X + i as u32,
0,
0,
0,
self.width as i32,
self.height as i32,
format_from_data_type::<T>(),
T::data_type(),
crate::context::PixelUnpackData::Slice(to_byte_slice(data)),
);
}
}
self.generate_mip_maps();
}
///
/// Creates a new cube texture generated from the equirectangular texture given as input.
///
pub fn new_from_equirectangular<T: PrimitiveDataType + TextureDataType>(
context: &Context,
cpu_texture: &CpuTexture,
) -> Self {
let texture_size = cpu_texture.width / 4;
let mut texture = Self::new_empty::<[T; 4]>(
context,
texture_size,
texture_size,
Interpolation::Linear,
Interpolation::Linear,
Some(Interpolation::Linear),
Wrapping::ClampToEdge,
Wrapping::ClampToEdge,
Wrapping::ClampToEdge,
);
{
let map = Texture2D::new(context, cpu_texture);
let fragment_shader_source = "
uniform sampler2D equirectangularMap;
uniform vec3 direction;
uniform vec3 up;
in vec2 uvs;
layout (location = 0) out vec4 outColor;
void main()
{
vec3 right = cross(direction, up);
vec3 dir = normalize(up * (uvs.y - 0.5) * 2.0 + right * (uvs.x - 0.5) * 2.0 + direction);
vec2 uv = vec2(0.1591 * atan(dir.z, dir.x) + 0.5, 0.3183 * asin(dir.y) + 0.5);
outColor = texture(equirectangularMap, uv);
}";
let program = Program::from_source(
context,
full_screen_vertex_shader_source(),
&fragment_shader_source,
)
.expect("Failed compiling shader");
for side in CubeMapSide::iter() {
let viewport = Viewport::new_at_origo(texture_size, texture_size);
texture
.as_color_target(&[side], None)
.clear(ClearState::default())
.write::<CoreError>(|| {
program.use_texture("equirectangularMap", &map);
program.use_uniform("direction", side.direction());
program.use_uniform("up", side.up());
full_screen_draw(context, &program, RenderStates::default(), viewport);
Ok(())
})
.unwrap();
}
}
texture
}
///
/// Returns a [ColorTarget] which can be used to clear, write to and read from the given side and mip level of this texture.
/// Combine this together with a [DepthTarget] with [RenderTarget::new] to be able to write to both a depth and color target at the same time.
/// If `None` is specified as the mip level, the 0 level mip level is used and mip maps are generated after a write operation if a mip map filter is specified.
/// Otherwise, the given mip level is used and no mip maps are generated.
///
/// **Note:** [DepthTest] is disabled if not also writing to a depth texture.
///
pub fn as_color_target<'a>(
&'a mut self,
sides: &'a [CubeMapSide],
mip_level: Option<u32>,
) -> ColorTarget<'a> {
ColorTarget::new_texture_cube_map(&self.context, self, sides, mip_level)
}
/// The width of this texture.
pub fn width(&self) -> u32 {
self.width
}
/// The height of this texture.
pub fn height(&self) -> u32 {
self.height
}
pub(in crate::core) fn generate_mip_maps(&self) {
if self.number_of_mip_maps > 1 {
self.bind();
unsafe {
self.context
.generate_mipmap(crate::context::TEXTURE_CUBE_MAP);
}
}
}
pub(in crate::core) fn bind_as_color_target(
&self,
side: CubeMapSide,
channel: u32,
mip_level: u32,
) {
unsafe {
self.context.framebuffer_texture_2d(
crate::context::DRAW_FRAMEBUFFER,
crate::context::COLOR_ATTACHMENT0 + channel,
side.to_const(),
Some(self.id),
mip_level as i32,
);
}
}
pub(in crate::core) fn bind(&self) {
unsafe {
self.context
.bind_texture(crate::context::TEXTURE_CUBE_MAP, Some(self.id));
}
}
}
impl Drop for TextureCubeMap {
fn drop(&mut self) {
unsafe {
self.context.delete_texture(self.id);
}
}
}