brawllib_rs 0.29.0

use std::f32::consts;
use std::mem;

use cgmath::{InnerSpace, Matrix4, MetricSpace, Quaternion, Rad, SquareMatrix, Vector3};
use wgpu::StoreOp;
use wgpu::util::DeviceExt;

use crate::high_level_fighter::{CollisionBoxValues, Extent, HighLevelSubaction};
use crate::renderer::app::state::InvulnerableType;
use crate::renderer::camera::Camera;
use crate::renderer::wgpu_state::{SAMPLE_COUNT, Vertex, WgpuState};

struct Draw {
    uniform: Matrix4<f32>,
    vertices: wgpu::Buffer,
    indices: wgpu::Buffer,
    indices_len: usize,
}

pub(crate) fn draw_frame(
    state: &mut WgpuState,
    framebuffer: &wgpu::TextureView,
    width: u32,
    height: u32,
    perspective: bool,
    wireframe: bool,
    render_ecb: bool,
    invulnerable_type: &InvulnerableType,
    subaction: &HighLevelSubaction,
    frame_index: usize,
    camera: &Camera,
) -> wgpu::CommandEncoder {
    let mut command_encoder = state
        .device
        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });

    let size = &mut state.multisampled_framebuffer_descriptor.size;
    if size.width != width || size.height != height {
        size.width = width;
        size.height = height;
        state.multisampled_framebuffer = state
            .device
            .create_texture(&state.multisampled_framebuffer_descriptor);
    }

    let draws = create_draws(
        state,
        width,
        height,
        perspective,
        wireframe,
        render_ecb,
        invulnerable_type,
        subaction,
        frame_index,
        camera,
    );

    let uniform_size = mem::size_of::<Matrix4<f32>>();
    let size_padded = 256;
    let mut uniforms_bytes = vec![0; draws.len() * size_padded];
    let mut uniforms_offset = 0;
    for draw in &draws {
        let transform: &[f32; 16] = draw.uniform.as_ref();
        uniforms_bytes[uniforms_offset..uniforms_offset + uniform_size]
            .copy_from_slice(bytemuck::bytes_of(transform));
        uniforms_offset += size_padded;
    }
    state
        .queue
        .write_buffer(&state.uniforms_buffer, 0, &uniforms_bytes);

    {
        let attachment = state
            .multisampled_framebuffer
            .create_view(&wgpu::TextureViewDescriptor::default());
        let mut rpass = command_encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
                view: if SAMPLE_COUNT == 1 {
                    framebuffer
                } else {
                    &attachment
                },
                resolve_target: if SAMPLE_COUNT == 1 {
                    None
                } else {
                    Some(framebuffer)
                },
                ops: wgpu::Operations {
                    load: wgpu::LoadOp::Clear(state.background_color),
                    store: StoreOp::Store,
                },
                depth_slice: None,
            })],
            depth_stencil_attachment: None,
            label: None,
            timestamp_writes: None,
            occlusion_query_set: None,
        });
        if wireframe {
            rpass.set_pipeline(&state.render_pipeline_line);
        } else {
            rpass.set_pipeline(&state.render_pipeline_fill);
        }

        for (i, draw) in draws.iter().enumerate() {
            rpass.set_bind_group(0, &state.bind_groups[i], &[]);
            rpass.set_index_buffer(draw.indices.slice(..), wgpu::IndexFormat::Uint16);
            rpass.set_vertex_buffer(0, draw.vertices.slice(..));
            rpass.draw_indexed(0..draw.indices_len as u32, 0, 0..1);
        }
    }

    command_encoder
}

fn create_draws(
    state: &WgpuState,
    width: u32,
    height: u32,
    perspective: bool,
    wireframe: bool,
    render_ecb: bool,
    invulnerable_type: &InvulnerableType,
    subaction: &HighLevelSubaction,
    frame_index: usize,
    camera: &Camera,
) -> Vec<Draw> {
    let mut draws: Vec<Draw> = vec![];

    let frame = &subaction.frames[frame_index];

    let extent_height = camera.extent.up - camera.extent.down;
    let extent_width = camera.extent.right - camera.extent.left;
    let extent_aspect = extent_width / extent_height;
    let aspect = width as f32 / height as f32;
    let fov = 40.0;

    let fov_rad = fov * consts::PI / 180.0;

    let camera_offset = Vector3::new(
        camera.radius() * camera.phi.sin() * camera.theta.sin(),
        camera.radius() * camera.phi.cos(),
        camera.radius() * camera.phi.sin() * camera.theta.cos(),
    );
    let camera_location = camera.target + camera_offset;
    let view = Matrix4::look_at_rh(camera_location, camera.target, Vector3::new(0.0, 1.0, 0.0));

    let projection = if perspective {
        cgmath::perspective(Rad(fov_rad), aspect, 1.0, 1000.0)
    } else {
        let mut height = extent_height;
        let mut width = extent_width;

        if extent_aspect > aspect {
            height = width / aspect;
        } else {
            width = height * aspect;
        }

        cgmath::ortho(
            -width / 2.0 * camera.radius_mult,
            width / 2.0 * camera.radius_mult,
            -height / 2.0 * camera.radius_mult,
            height / 2.0 * camera.radius_mult,
            -1000.0,
            1000.0,
        )
    };

    let transform_translation_frame =
        Matrix4::from_translation(Vector3::new(0.0, frame.y_pos, frame.x_pos));

    for hurt_box in &frame.hurt_boxes {
        let color = if hurt_box.state.is_intangible() {
            [0.0, 0.0, 1.0, 0.15]
        } else if hurt_box.state.is_invincible() {
            [0.0, 1.0, 0.0, 0.15]
        } else {
            match invulnerable_type {
                InvulnerableType::Hit => [1.0, 1.0, 0.0, 0.15],
                InvulnerableType::Grab => {
                    if hurt_box.hurt_box.grabbable {
                        [1.0, 1.0, 0.0, 0.15]
                    } else {
                        [0.0, 0.0, 1.0, 0.15]
                    }
                }
                InvulnerableType::TrapItem => {
                    if hurt_box.hurt_box.trap_item_hittable {
                        [1.0, 1.0, 0.0, 0.15]
                    } else {
                        [0.0, 0.0, 1.0, 0.15]
                    }
                }
            }
        };

        // Ah ... so its less of an offset + stretch and more like two seperate independent offsets.
        let prev = hurt_box.hurt_box.offset;
        let next = hurt_box.hurt_box.stretch;
        let radius = hurt_box.hurt_box.radius;

        let model = transform_translation_frame * hurt_box.bone_matrix;
        let transform = projection * view * model;
        draws.push(draw_cylinder(
            state, prev, next, radius, transform, color, wireframe,
        ));
    }

    for hitbox in frame.hit_boxes.iter() {
        // only display hitboxes that are used in regular matches
        if let CollisionBoxValues::Hit(hit_values) = &hitbox.next_values
            && !hit_values.enabled
        {
            continue;
        }

        let color = match hitbox.hitbox_id {
            0 => [0.93725, 0.39216, 0.00000, 0.2], // orange
            1 => [1.00000, 0.00000, 0.00000, 0.2], // red
            2 => [1.00000, 0.00000, 1.00000, 0.2], // purple
            3 => [0.09412, 0.83922, 0.78823, 0.2], // turqoise
            4 => [0.14118, 0.83992, 0.09412, 0.2], // green
            _ => [1.00000, 1.00000, 1.00000, 0.2], // white
        };

        let next = Vector3::new(hitbox.next_pos.x, hitbox.next_pos.y, hitbox.next_pos.z);
        let prev = hitbox
            .prev_pos
            .map(|prev| Vector3::new(prev.x, prev.y, prev.z))
            .unwrap_or(next);
        let radius = hitbox.next_size;
        let transform = projection * view * transform_translation_frame;
        draws.push(draw_cylinder(
            state, prev, next, radius, transform, color, wireframe,
        ));
    }

    if let Some(ref ledge_grab_box) = frame.ledge_grab_box {
        let _color = [1.0, 1.0, 1.0, 0.5];
        let vertices_array = [
            Vertex {
                _pos: [0.0, ledge_grab_box.up, ledge_grab_box.left, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, ledge_grab_box.up, ledge_grab_box.right, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, ledge_grab_box.down, ledge_grab_box.left, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, ledge_grab_box.down, ledge_grab_box.right, 1.0],
                _color,
            },
        ];

        let indices_array: [u16; 6] = [0, 1, 2, 1, 2, 3];

        let vertices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::bytes_of(&vertices_array),
                usage: wgpu::BufferUsages::VERTEX,
            });
        let indices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::bytes_of(&indices_array),
                usage: wgpu::BufferUsages::INDEX,
            });

        let model = Matrix4::from_translation(Vector3::new(0.0, frame.y_pos, frame.x_pos));
        let uniform = projection * view * model;

        let indices_len = indices_array.len();
        draws.push(Draw {
            uniform,
            vertices,
            indices,
            indices_len,
        });
    }

    if render_ecb {
        // transN
        #[allow(clippy::float_cmp)]
        let _color = if frame.ecb.transn_y == frame.ecb.bottom {
            [0.0, 1.0, 0.0, 1.0]
        } else {
            [1.0, 1.0, 1.0, 1.0]
        };

        let mut vertices_vec: Vec<Vertex> = vec![];
        let mut indices_vec: Vec<u16> = vec![];

        let iterations = 40;
        vertices_vec.push(Vertex {
            _pos: [0.0, 0.0, 0.0, 1.0],
            _color,
        });
        for i in 0..iterations {
            let angle = i as f32 * 2.0 * consts::PI / (iterations as f32);
            let (sin, cos) = angle.sin_cos();
            let x = cos * 0.3;
            let y = sin * 0.3;
            vertices_vec.push(Vertex {
                _pos: [0.0, y, x, 1.0],
                _color,
            });
            indices_vec.push(0);
            indices_vec.push(i + 1);
            indices_vec.push((i + 1) % iterations + 1);
        }

        let vertices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::cast_slice(&vertices_vec),
                usage: wgpu::BufferUsages::VERTEX,
            });
        let indices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::cast_slice(&indices_vec),
                usage: wgpu::BufferUsages::INDEX,
            });

        let model = Matrix4::from_translation(Vector3::new(
            0.0,
            frame.y_pos + frame.ecb.transn_y,
            frame.x_pos + frame.ecb.transn_x,
        ));
        let uniform = projection * view * model;

        let indices_len = indices_vec.len();
        draws.push(Draw {
            uniform,
            vertices,
            indices,
            indices_len,
        });

        // ECB
        let _color = [0.945, 0.361, 0.0392, 1.0];
        let mid_y = (frame.ecb.top + frame.ecb.bottom) / 2.0;
        let vertices_array = [
            Vertex {
                _pos: [0.0, frame.ecb.top, 0.0, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, mid_y, frame.ecb.left, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, mid_y, frame.ecb.right, 1.0],
                _color,
            },
            Vertex {
                _pos: [0.0, frame.ecb.bottom, 0.0, 1.0],
                _color,
            },
        ];

        let indices_array: [u16; 6] = [0, 1, 2, 1, 2, 3];

        let vertices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::bytes_of(&vertices_array),
                usage: wgpu::BufferUsages::VERTEX,
            });
        let indices = state
            .device
            .create_buffer_init(&wgpu::util::BufferInitDescriptor {
                label: None,
                contents: bytemuck::bytes_of(&indices_array),
                usage: wgpu::BufferUsages::INDEX,
            });

        let model = Matrix4::from_translation(Vector3::new(0.0, frame.y_pos, frame.x_pos));
        let uniform = projection * view * model;

        let indices_len = indices_array.len();
        draws.push(Draw {
            uniform,
            vertices,
            indices,
            indices_len,
        });
    }

    draws
}

/// Keep this around, handy for debugging extent generation
/// Generating the full debug extent generation must be disabled during normal use as it would be too expensive.
/// Use like:
/// let transform = projection.clone() * view.clone();
/// for extent in &subaction_extent.extents {
///     draws.push(_draw_extent(state, extent, &transform));
/// }
fn _draw_extent(state: &WgpuState, extent: &Extent, external_transform: &Matrix4<f32>) -> Draw {
    let small = 0.01;
    let _color = [1.0, 1.0, 1.0, 1.0];
    let vertices_array = [
        Vertex {
            _pos: [0.0, extent.up + small, extent.left, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up - small, extent.left, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up + small, extent.right, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up - small, extent.right, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down + small, extent.left, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down - small, extent.left, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down + small, extent.right, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down - small, extent.right, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up, extent.right + small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up, extent.right - small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down, extent.right + small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down, extent.right - small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up, extent.left + small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.up, extent.left - small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down, extent.left + small, 1.0],
            _color,
        },
        Vertex {
            _pos: [0.0, extent.down, extent.left - small, 1.0],
            _color,
        },
    ];
    let indices_array: [u16; 24] = [
        0, 1, 2, 1, 2, 3, 4, 5, 6, 5, 6, 7, 8, 9, 10, 9, 10, 11, 12, 13, 14, 13, 14, 15,
    ];

    let vertices = state
        .device
        .create_buffer_init(&wgpu::util::BufferInitDescriptor {
            label: None,
            contents: bytemuck::bytes_of(&vertices_array),
            usage: wgpu::BufferUsages::VERTEX,
        });
    let indices = state
        .device
        .create_buffer_init(&wgpu::util::BufferInitDescriptor {
            label: None,
            contents: bytemuck::bytes_of(&indices_array),
            usage: wgpu::BufferUsages::INDEX,
        });
    let indices_len = indices_array.len();

    let uniform = *external_transform;
    Draw {
        uniform,
        vertices,
        indices,
        indices_len,
    }
}

fn draw_cylinder(
    state: &WgpuState,
    prev: Vector3<f32>,
    next: Vector3<f32>,
    radius: f32,
    external_transform: Matrix4<f32>,
    _color: [f32; 4],
    wireframe: bool,
) -> Draw {
    let prev_distance = prev.distance(next);

    // Make the wireframes less busy in wireframe mode
    let (width_segments, height_segments) = if wireframe { (11, 7) } else { (23, 17) };

    let mut vertices_vec = vec![];
    let mut indices_vec: Vec<u16> = vec![];
    let mut index_count = 0;

    let mut grid = vec![];
    for iy in 0..height_segments + 1 {
        let mut vertices_row = vec![];
        let v = iy as f32 / height_segments as f32;

        for ix in 0..width_segments + 1 {
            let u = ix as f32 / width_segments as f32;
            let mut y_offset = 0.0;
            if (0.0..=0.5).contains(&v) {
                y_offset += prev_distance;
            }

            let sin_v_pi = (v * consts::PI).sin();
            let _pos = [
                radius * (u * consts::PI * 2.0).cos() * sin_v_pi,
                radius * (v * consts::PI).cos() + y_offset,
                radius * (u * consts::PI * 2.0).sin() * sin_v_pi,
                1.0,
            ];
            vertices_vec.push(Vertex { _pos, _color });

            vertices_row.push(index_count);
            index_count += 1;
        }
        grid.push(vertices_row);
    }

    for iy in 0..height_segments {
        for ix in 0..width_segments {
            let a = grid[iy][ix + 1];
            let b = grid[iy][ix];
            let c = grid[iy + 1][ix];
            let d = grid[iy + 1][ix + 1];

            indices_vec.extend([a, b, d]);
            indices_vec.extend([b, c, d]);
        }
    }

    let vertices = state
        .device
        .create_buffer_init(&wgpu::util::BufferInitDescriptor {
            label: None,
            contents: bytemuck::cast_slice(&vertices_vec),
            usage: wgpu::BufferUsages::VERTEX,
        });
    let indices = state
        .device
        .create_buffer_init(&wgpu::util::BufferInitDescriptor {
            label: None,
            contents: bytemuck::cast_slice(&indices_vec),
            usage: wgpu::BufferUsages::INDEX,
        });

    let diff = (prev - next).normalize();
    let rotation = if diff.x.is_nan() {
        // This occurs when prev == next
        Matrix4::identity()
    } else {
        let source_angle = Vector3::new(0.0, 1.0, 0.0);
        Quaternion::from_arc(source_angle, diff, None).into()
    };
    let uniform = external_transform * Matrix4::from_translation(next) * rotation;
    let indices_len = indices_vec.len();

    Draw {
        uniform,
        vertices,
        indices,
        indices_len,
    }
}