1 files changed, 37 insertions, 3 deletions

diff --git a/webhogg/wasm/src/context/graphics.rs b/webhogg/wasm/src/context/graphics.rs
index fa37e39..6af35a2 100644
--- a/webhogg/wasm/src/context/graphics.rs
+++ b/webhogg/wasm/src/context/graphics.rs
@@ -1,13 +1,18 @@
-use log::*;
 use crate::error::WasmError;
 use wasm_bindgen::JsCast;
 use web_sys::WebGl2RenderingContext as GlContext;
 
-use super::webgl::{Color4, WebGl2};
+use super::webgl;
+use super::webgl::{Color4, ShaderType, WebGl2};
+use super::shader::{MAIN_VERTEX_SHADER, MAIN_FRAGMENT_SHADER};
+use super::shader::ShaderProgram;
 
 pub struct GraphicsContext {
     gl: WebGl2,
     frame_nr: u64,
+    shader: ShaderProgram,
+    vao: webgl::WebGlVertexArrayObject,
+    buffer: webgl::WebGlBuffer,
 }
 
 impl GraphicsContext {
@@ -23,9 +28,33 @@ impl GraphicsContext {
                     format!("context object is not a context")))?;
 
         let gl = WebGl2::from_context(context);
+        let shader = ShaderProgram::from_sources(&gl, &[
+            (ShaderType::Vertex, MAIN_VERTEX_SHADER.to_string()),
+            (ShaderType::Fragment, MAIN_FRAGMENT_SHADER.to_string()),
+        ])?;
+
+        let vao = gl.create_vertex_array()
+            .map_err(|_| WasmError::WebGlBuffer(
+                    format!("glGenVertexArrays failed")))?;
+        gl.bind_vertex_array(&vao);
+
+        let buffer = gl.create_buffer()
+            .map_err(|_| WasmError::WebGlBuffer(
+                    format!("glCreateBuffer failed")))?;
+        gl.bind_array_buffer(&buffer);
+        gl.array_buffer_data_f32(&[
+            0.0, 0.0,
+            1.0, 0.0,
+            0.0, 1.0,
+            1.0, 1.0,
+            0.0, 1.0,
+            1.0, 0.0,
+        ]);
+        gl.enable_vertex_attrib_array(0);
             
         Ok(Self {
             gl, frame_nr: 0,
+            shader, vao, buffer
         })
     }
 
@@ -38,7 +67,12 @@ impl GraphicsContext {
         let b = f32::abs(f32::cos(a));
         let (a, b) = (a * light, b * light);
 
-        self.gl.clear(Color4::new(a, light - a, b, 1.0));
+        self.gl.set_viewport();
+        self.gl.clear(&Color4::new(a, light - a, b, 1.0));
+
+        self.shader.run(&self.gl);
+        self.gl.vertex_attrib_f32_pointer(0, 2);
+        self.gl.draw_triangle_arrays(6);
 
         self.frame_nr += 1;