still flickering? :(

shaders/triangle.frag

@@ -5,7 +5,8 @@ layout(set = 0, binding = 0) uniform sampler2D texSamplers[];
 
 layout(location = 0) in vec2 uv;
 layout(location = 1) in vec4 color;
-layout(location = 2) in flat uint tex_id;
+layout(location = 2) in float alpha;
+layout(location = 3) in flat uint tex_id;
 
 layout(location = 0) out vec4 out_color;
 

shaders/triangle.vert

@@ -1,5 +1,5 @@
 #version 460
-#extension GL_EXT_nonuniform_qualifier : require
+#extension GL_EXT_buffer_reference : require
 
 struct Vertex {
     vec2 pos;
@@ -9,20 +9,36 @@ struct Vertex {
     uint textureID;
 };
 
-layout(std430, set = 0, binding = 1) readonly buffer VertexBuffer {
-    Vertex vertices[];
-} vBuf;
+layout(location = 0) in vec2 inPos;       // Matches VK_FORMAT_R32G32_SFLOAT
+layout(location = 1) in vec2 inTexCoord;  // Matches VK_FORMAT_R32G32_SFLOAT
+layout(location = 2) in vec4 inColor;     // Matches VK_FORMAT_R32G32B32A32_SFLOAT
+layout(location = 3) in float inAlpha;    // Matches VK_FORMAT_R32_SFLOAT
+layout(location = 4) in uint inTextureID; // Matches VK_FORMAT_R32_UINT
+
+//layout(std430, set = 0, binding = 1) readonly buffer VertexBuffer {
+//    Vertex vertices[];
+//} vBuf;
+
+//layout(buffer_reference, std430) readonly buffer VertexBuffer{
+//    Vertex vertices[];
+//};
+
+//push constants block
+//layout(push_constant) uniform constants {
+//    mat4 render_matrix;
+//    VertexBuffer vertexBuffer;
+//} PushConstants;
 
 layout(location = 0) out vec2 uv;
 layout(location = 1) out vec4 color;
-layout(location = 2) out flat uint tex_id;
+layout(location = 2) out float alpha;
+layout(location = 3) out flat uint tex_id;
 
 void main() {
 
-    Vertex v = vBuf.vertices[gl_VertexIndex];
-
-    uv = v.uv;
-    color = v.color;
-    tex_id = v.textureID;
-    gl_Position = vec4(v.pos, 0.0, 1.0);
+    uv = inTexCoord;
+    color = inColor;
+    alpha = inAlpha;
+    tex_id = inTextureID;
+    gl_Position = vec4(inPos, 0.0, 1.0);
 }