pre vertex buffer

shaders/compile.bat

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+C:/VulkanSDK/1.3.280.0/Bin/glslc.exe shaders/shader.vert -o shaders/vert.spv
+C:/VulkanSDK/1.3.280.0/Bin/glslc.exe shaders/shader.frag -o shaders/frag.spv
+pause

shaders/shader.frag

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+#version 450
+
+layout(location = 0) in vec3 fragColor;
+
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    outColor = vec4(fragColor, 1.0);
+}

shaders/shader.vert

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+#version 450
+
+vec2 positions[3] = vec2[](
+    vec2(0.0, -0.5),
+    vec2(0.5, 0.5),
+    vec2(-0.5, 0.5)
+);
+
+vec3 colors[3] = vec3[](
+    vec3(1.0, 0.0, 0.0),
+    vec3(0.0, 1.0, 0.0),
+    vec3(0.0, 0.0, 1.0)
+);
+
+layout(location = 0) out vec3 fragColor;
+
+void main() {
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+    fragColor = colors[gl_VertexIndex];
+}