working on additive blending for determination of winding order. Saving here because this bug is very pretty

resources/shaders/color-passthrough.frag

@@ -7,7 +7,12 @@ layout(location = 0) in vec4 out_color;
 layout(location = 0) out vec4 f_color;
 
 void main() {
-    f_color = out_color;
+    if (int(out_color.w) % 2 == 0) {
+
+        f_color = out_color;
+        f_color.w = 255.0;
+    }
+
 }
 
 

resources/shaders/color-passthrough.vert

@@ -10,6 +10,8 @@ layout(location = 0) out vec4 out_color;
 void main() {
     out_color = color;
     gl_Position = vec4(v_position, 1.0);
+
+
 }
 
 

resources/shaders/simple_text.frag

@@ -8,5 +8,13 @@ layout(location = 0) in vec4 out_color;
 layout(location = 0) out vec4 f_color;
 
 void main() {
-    f_color = out_color;
+
+
+    if (int(out_color.w) % 2 == 0) {
+
+        f_color = out_color;
+        f_color.w = 255.0;
+    }
+
+    //f_color = out_color;
 }

src/canvas/canvas_state.rs

@@ -392,7 +392,7 @@ impl CanvasState {
         let mut image_vertex_buffer: HashMap<Arc<CanvasImageHandle>, Vec<ImageVertex3D>> = HashMap::new();
         let mut text_instances: HashMap<Arc<CanvasFontHandle>, Vec<TextVertex3D>> = HashMap::new();
 
-        let mut text_vertex_buffer: Vec<TextVertex3D> = Vec::new();
+        let mut text_vertex_buffer: Vec<ColorVertex3D> = Vec::new();
 
         for value in canvas_frame.map {
             match value {
@@ -542,29 +542,58 @@ impl CanvasState {
             }
         }
 
-        self.dynamic_state = DynamicState {
+
-            line_width: None,
-            viewports: self.dynamic_state.viewports.clone(),
-            scissors: None,
-            compare_mask: Some(DynamicStencilValue {
-                face: StencilFaceFlags::StencilFrontAndBack,
-                value: 0xFF,
-            }),
-            write_mask: Some(DynamicStencilValue {
-                face: StencilFaceFlags::StencilFrontAndBack,
-                value: 0xFF,
-            }),
-            reference: Some(DynamicStencilValue {
-                face: StencilFaceFlags::StencilFrontAndBack,
-                value: 0xFF,
-            }),
-        };
 
         // Text
         let mut shader = self.shader_buffers.get(
             self.get_shader_handle(String::from("simple_text"))
                 .unwrap().clone().get_handle() as usize
         ).unwrap();
+//
+//        self.dynamic_state = DynamicState {
+//            line_width: None,
+//            viewports: self.dynamic_state.viewports.clone(),
+//            scissors: None,
+//            compare_mask: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0x00,
+//            }),
+//            write_mask: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0xFF,
+//            }),
+//            reference: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0x00,
+//            }),
+//        };
+//
+//        if !allocated_buffers.text_vertex_buffer.is_empty() {
+//            command_buffer = command_buffer.draw(
+//                shader.get_pipeline().clone(),
+//                &self.dynamic_state.clone(),
+//                allocated_buffers.text_vertex_buffer.clone(),
+//                (), (),
+//            ).unwrap();
+//        }
+//
+//        self.dynamic_state = DynamicState {
+//            line_width: None,
+//            viewports: self.dynamic_state.viewports.clone(),
+//            scissors: None,
+//            compare_mask: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0xFF,
+//            }),
+//            write_mask: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0x00,
+//            }),
+//            reference: Some(DynamicStencilValue {
+//                face: StencilFaceFlags::StencilFrontAndBack,
+//                value: 0x00,
+//            }),
+//        };
 
         if !allocated_buffers.text_vertex_buffer.is_empty() {
             command_buffer = command_buffer.draw(
@@ -575,6 +604,7 @@ impl CanvasState {
             ).unwrap();
         }
 
+
         command_buffer
             .end_render_pass()
             .unwrap()

src/canvas/managed/shader/text_shader.rs

@@ -17,6 +17,7 @@ use crate::canvas::managed::shader::generic_shader::GenericShader;
 use crate::canvas::managed::shader::dynamic_vertex::RuntimeVertexDef;
 use crate::canvas::managed::ShaderSpecializationConstants;
 use crate::util::vertex::ColorVertex3D;
+use vulkano::pipeline::blend::{LogicOp, AttachmentBlend, BlendOp, BlendFactor};
 
 
 /// CanvasShader holds the pipeline and render pass for the input shader source
@@ -80,19 +81,19 @@ impl CompiledShader for TextShader {
             depth_write: true,
             depth_bounds_test: DepthBounds::Disabled,
             stencil_front: Stencil {
-                compare: Compare::Equal,
+                compare: Compare::NotEqual,
-                pass_op: StencilOp::IncrementAndWrap,
+                pass_op: StencilOp::Keep,
-                fail_op: StencilOp::DecrementAndClamp,
+                fail_op: StencilOp::IncrementAndWrap,
                 depth_fail_op: StencilOp::Keep,
                 compare_mask: None,
                 write_mask: None,
                 reference: None,
             },
             stencil_back: Stencil {
-                compare: Compare::Equal,
+                compare: Compare::NotEqual,
-                pass_op: StencilOp::Invert,
+                pass_op: StencilOp::Keep,
-                fail_op: StencilOp::Zero,
+                fail_op: StencilOp::DecrementAndWrap,
-                depth_fail_op: StencilOp::Zero,
+                depth_fail_op: StencilOp::Keep,
                 compare_mask: None,
                 write_mask: None,
                 reference: None,
@@ -101,6 +102,21 @@ impl CompiledShader for TextShader {
 
         let vertex_definition = RuntimeVertexDef::from_primitive(0);
 
+
+        let blend = AttachmentBlend {
+            enabled: true,
+            color_op: BlendOp::Add,
+            color_source: BlendFactor::SrcAlpha,
+            color_destination: BlendFactor::OneMinusSrcAlpha,
+            alpha_op: BlendOp::Add,
+            alpha_source: BlendFactor::SrcAlpha,
+            alpha_destination: BlendFactor::OneMinusSrcAlpha,
+            mask_red: true,
+            mask_green: true,
+            mask_blue: true,
+            mask_alpha: true,
+        };
+
         TextShader {
             graphics_pipeline:
             Some(Arc::new(GraphicsPipeline::start()
@@ -124,8 +140,9 @@ impl CompiledShader for TextShader {
                     third_constant: 0.0,
                 })
 
-                .depth_stencil(stencil)
+                .depth_stencil_simple_depth()
-
+                .blend_collective(blend)
+                .blend_logic_op(LogicOp::And)
                 // We have to indicate which subpass of which render pass this pipeline is going to be used
                 // in. The pipeline will only be usable from this particular subpass.
                 .render_pass(Subpass::from(render_pass.clone(), 0).unwrap())

src/drawables/text.rs

@@ -26,7 +26,7 @@ impl Text {
                 },
                 ColorVertex3D {
                     v_position: [-1.0, 1.0, normalized_depth],
-                    color: [1.0, 1.0, 1.0, 1.0],
+                    color: [1.0, 0.8, 1.0, 1.0],
                 },
                 ColorVertex3D {
                     v_position: [-0.25, 0.0, normalized_depth],
@@ -34,7 +34,7 @@ impl Text {
                 },
                 ColorVertex3D {
                     v_position: [-0.25, 0.0, normalized_depth],
-                    color: [1.0, 1.0, 1.0, 1.0],
+                    color: [0.8, 1.0, 1.0, 1.0],
                 },
                 ColorVertex3D {
                     v_position: [-1.0, 1.0, normalized_depth],
@@ -42,7 +42,7 @@ impl Text {
                 },
                 ColorVertex3D {
                     v_position: [0.0, 0.5, normalized_depth],
-                    color: [1.0, 1.0, 1.0, 1.0],
+                    color: [1.0, 1.0, 0.8, 1.0],
                 },
                 ColorVertex3D {
                     v_position: [0.25, 0.0, normalized_depth],
@@ -50,7 +50,7 @@ impl Text {
                 },
                 ColorVertex3D {
                     v_position: [-1.0, 1.0, normalized_depth],
-                    color: [1.0, 1.0, 1.0, 1.0],
+                    color: [1.0, 0.8, 1.0, 1.0],
                 },
                 ColorVertex3D {
                     v_position: [0.0, 0.5, normalized_depth],
@@ -119,7 +119,7 @@ impl Text {
         };
 
         Text {
-            verts: VertexTypes::ColorType(verts),
+            verts: VertexTypes::TextType(verts),
             position: position,
             size: size,
         }

src/util/vertex.rs

@@ -56,7 +56,7 @@ pub enum VertexTypes {
     ImageType(Vec<ImageVertex3D>, Arc<CanvasImageHandle>),
     ColorType(Vec<ColorVertex3D>),
     ThreeDType(Vec<Vertex3D>),
-    TextType(Vec<TextVertex3D>),
+    TextType(Vec<ColorVertex3D>),
 
 }