feat: add shader pipeline and chunk GLSL shaders

Assets/shaders/chunk.frag

@@ -0,0 +1,13 @@
+#version 330 core
+in vec2 vUv;
+in float vShade;
+
+out vec4 FragColor;
+
+uniform sampler2D atlas;
+
+void main()
+{
+    vec4 texel = texture(atlas, vUv);
+    FragColor = vec4(texel.rgb * vShade, 1.0);
+}

Assets/shaders/chunk.vert

@@ -0,0 +1,19 @@
+#version 330 core
+layout(location = 0) in vec3 aPos;
+layout(location = 1) in vec2 aUv;
+layout(location = 2) in float aShade;
+
+out vec2 vUv;
+out float vShade;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    vUv = aUv;
+    vShade = aShade;
+    // Vector-on-left convention; matrices are uploaded with transpose=true.
+    gl_Position = vec4(aPos, 1.0) * model * view * projection;
+}