98 lines
2.6 KiB
Rust
98 lines
2.6 KiB
Rust
use imgui::DrawData;
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use crate::common::{Color, Rect};
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use crate::framework::context::Context;
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use crate::framework::error::GameResult;
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use crate::framework::graphics::BlendMode;
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use crate::Game;
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#[repr(C)]
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#[derive(Copy, Clone)]
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pub struct VertexData {
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pub position: (f32, f32),
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pub uv: (f32, f32),
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pub color: (u8, u8, u8, u8),
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}
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#[derive(Copy, Clone, PartialEq)]
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pub enum BackendShader {
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Fill,
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Texture
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}
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pub trait Backend {
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fn create_event_loop(&self) -> GameResult<Box<dyn BackendEventLoop>>;
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}
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pub trait BackendEventLoop {
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fn run(&mut self, game: &mut Game, ctx: &mut Context);
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fn new_renderer(&self) -> GameResult<Box<dyn BackendRenderer>>;
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}
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pub trait BackendRenderer {
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fn renderer_name(&self) -> String;
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fn clear(&mut self, color: Color);
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fn present(&mut self) -> GameResult;
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fn prepare_draw(&mut self, _width: f32, _height: f32) -> GameResult {
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Ok(())
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}
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fn create_texture_mutable(&mut self, width: u16, height: u16) -> GameResult<Box<dyn BackendTexture>>;
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fn create_texture(&mut self, width: u16, height: u16, data: &[u8]) -> GameResult<Box<dyn BackendTexture>>;
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fn set_blend_mode(&mut self, blend: BlendMode) -> GameResult;
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fn set_render_target(&mut self, texture: Option<&Box<dyn BackendTexture>>) -> GameResult;
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fn draw_rect(&mut self, rect: Rect, color: Color) -> GameResult;
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fn draw_outline_rect(&mut self, rect: Rect, line_width: usize, color: Color) -> GameResult;
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fn imgui(&self) -> GameResult<&mut imgui::Context>;
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fn render_imgui(&mut self, draw_data: &DrawData) -> GameResult;
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fn supports_vertex_draw(&self) -> bool {
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false
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}
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fn draw_triangle_list(&mut self, vertices: Vec<VertexData>, texture: Option<&Box<dyn BackendTexture>>, shader: BackendShader) -> GameResult;
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}
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pub trait BackendTexture {
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fn dimensions(&self) -> (u16, u16);
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fn add(&mut self, command: SpriteBatchCommand);
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fn clear(&mut self);
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fn draw(&mut self) -> GameResult;
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}
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#[allow(unreachable_code)]
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pub fn init_backend() -> GameResult<Box<dyn Backend>> {
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#[cfg(all(feature = "backend-glutin"))]
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{
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return crate::framework::backend_glutin::GlutinBackend::new();
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}
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#[cfg(feature = "backend-sdl")]
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{
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return crate::framework::backend_sdl2::SDL2Backend::new();
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}
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log::warn!("No backend compiled in, using null backend instead.");
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crate::framework::backend_null::NullBackend::new()
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}
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pub enum SpriteBatchCommand {
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DrawRect(Rect<f32>, Rect<f32>),
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DrawRectFlip(Rect<f32>, Rect<f32>, bool, bool),
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DrawRectTinted(Rect<f32>, Rect<f32>, Color),
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}
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