Add chess GUI and move generation

shaders/piece.frag

@@ -0,0 +1,11 @@
+#version 450
+
+layout(set = 0, binding = 0) uniform sampler2D piece_texture;
+
+layout(location = 0) in vec4 frag_color;
+layout(location = 1) in vec2 frag_uv;
+layout(location = 0) out vec4 out_color;
+
+void main() {
+  out_color = texture(piece_texture, frag_uv) * frag_color;
+}

shaders/piece.vert

@@ -0,0 +1,14 @@
+#version 450
+
+layout(location = 0) in vec2 in_position;
+layout(location = 1) in vec4 in_color;
+layout(location = 2) in vec2 in_uv;
+
+layout(location = 0) out vec4 frag_color;
+layout(location = 1) out vec2 frag_uv;
+
+void main() {
+  gl_Position = vec4(in_position, 0.0, 1.0);
+  frag_color = in_color;
+  frag_uv = in_uv;
+}

shaders/square.frag

@@ -1,7 +1,8 @@
 #version 450
 
+layout(location = 0) in vec4 frag_color;
 layout(location = 0) out vec4 out_color;
 
 void main() {
-  out_color = vec4(0.1, 0.8, 1.0, 1.0);
+  out_color = frag_color;
 }

shaders/square.vert

@@ -1,7 +1,11 @@
 #version 450
 
-layout(location=0) in vec2 in_position;
+layout(location = 0) in vec2 in_position;
+layout(location = 1) in vec4 in_color;
+
+layout(location = 0) out vec4 frag_color;
 
 void main() {
   gl_Position = vec4(in_position, 0.0, 1.0);
+  frag_color = in_color;
 }