refactor view/scene to separate modules

src/scenes/world.rs

@@ -0,0 +1,123 @@
+use scene;
+use tile;
+use view;
+
+extern crate gfx;
+extern crate piston_window;
+
+use std::marker::PhantomData;
+
+use gfx::tex;
+use gfx::traits::FactoryExt;
+
+gfx_defines! {
+  vertex Vertex {
+    pos: [f32; 3] = "a_pos",
+    uv: [f32; 2] = "a_uv",
+    tileidx: u32 = "a_tileidx",
+  }
+
+  pipeline pipe {
+    vbuf: gfx::VertexBuffer<Vertex> = (),
+    trans: gfx::ConstantBuffer<::view::Trans> = "b_trans",
+    atlas: gfx::TextureSampler<[f32; 4]> = "t_atlas",
+    pixcolor: gfx::RenderTarget<::view::ColorFormat> = "pixcolor",
+    depth: gfx::DepthTarget<::view::DepthFormat> = gfx::preset::depth::LESS_EQUAL_WRITE,
+  }
+}
+
+
+fn get_model(/*x: u16, y: u16,*/ tile: &tile::Tile) -> ([Vertex; 4], [u16; 6]) {
+  let tileidx = tile.val as u32;
+  ([Vertex { pos: [ 0., 0., 0. ], uv: [0., 0.], tileidx: tileidx },
+    Vertex { pos: [ 1., 0., 0. ], uv: [1., 0.], tileidx: tileidx },
+    Vertex { pos: [ 1., 0., 1. ], uv: [1., 1.], tileidx: tileidx },
+    Vertex { pos: [ 0., 0., 1. ], uv: [0., 1.], tileidx: tileidx },],
+   [ 0, 1, 2,
+     2, 3, 0 ])
+}
+
+pub struct WorldScene<D: gfx::Device,
+                      F: gfx::Factory<D::Resources>> {
+  pso: gfx::PipelineState<D::Resources, pipe::Meta>,
+  trans: gfx::handle::Buffer<D::Resources, view::Trans>,
+  atlas: gfx::handle::ShaderResourceView<D::Resources,
+                                         <view::ColorFormat as gfx::format::Formatted>::View>,
+  sampler: gfx::handle::Sampler<D::Resources>,
+  f: PhantomData<F>
+}
+
+impl<D: gfx::Device, F: gfx::Factory<D::Resources>> WorldScene<D, F> {
+  pub fn new(factory: &mut F, trans: &gfx::handle::Buffer<D::Resources, view::Trans>) -> WorldScene<D, F> {
+    WorldScene {
+      pso: factory.create_pipeline_simple(VERTEX_SHADER_SRC,
+                                          FRAGMENT_SHADER_SRC,
+                                          pipe::new())
+                  .expect("create pipeline"),
+      trans: trans.clone(),
+      atlas: tile::get_tiles::<_, _, view::ColorFormat>(factory),
+      sampler: factory.create_sampler(tex::SamplerInfo::new(tex::FilterMethod::Scale,
+                                                            tex::WrapMode::Clamp)),
+      f: PhantomData,
+    }
+  }
+}
+
+impl<D: gfx::Device,
+     F: gfx::Factory<D::Resources>> scene::Scene<D, F> for WorldScene<D, F> {
+
+  fn update(&mut self) {
+  }
+
+  fn render(&self,
+            factory: &mut F,
+            encoder: &mut gfx::Encoder<D::Resources, D::CommandBuffer>,
+            target: &gfx::handle::RenderTargetView<D::Resources, view::ColorFormat>,
+            depth: &gfx::handle::DepthStencilView<D::Resources, view::DepthFormat>) {
+    let (model, model_idx) = get_model(&tile::Tile { val: 31 });
+    let (vertex_buffer, slice) =
+        factory.create_vertex_buffer_with_slice(&model, &model_idx[..]);
+
+    let pipe = pipe::Data {
+      vbuf: vertex_buffer.clone(),
+      trans: self.trans.clone(),
+      atlas: (self.atlas.clone(), self.sampler.clone()),
+      pixcolor: target.clone(),
+      depth: depth.clone(),
+    };
+    encoder.draw(&slice, &self.pso, &pipe);
+  }
+}
+
+const VERTEX_SHADER_SRC: &'static [u8] = br#"
+    #version 150
+
+    in vec3 a_pos;
+    in vec2 a_uv;
+    in uint a_tileidx;
+    out vec2 v_uv;
+    flat out uint v_tileidx;
+    uniform b_trans {
+      mat4 u_matrix;
+    };
+
+    void main() {
+        v_uv = a_uv;
+        v_tileidx = a_tileidx;
+        gl_Position = u_matrix * vec4(a_pos, 1.0);
+    }
+"#;
+
+const FRAGMENT_SHADER_SRC: &'static [u8] = br#"
+    #version 150
+
+    in vec2 v_uv;
+    flat in uint v_tileidx;
+    out vec4 pixcolor;
+    uniform sampler2D t_atlas;
+
+    void main() {
+        vec2 uv = vec2(v_uv.x, float(v_tileidx) / 256.0 + (1.0 - v_uv.y) / 256.0);
+        pixcolor = texture(t_atlas, uv);
+    }
+"#;