Add imgui example (wip)

data/shaders/imgui/scene.frag

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec3 inNormal;
+layout (location = 1) in vec3 inColor;
+layout (location = 2) in vec3 inViewVec;
+layout (location = 3) in vec3 inLightVec;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main() 
+{
+	vec3 N = normalize(inNormal);
+	vec3 L = normalize(inLightVec);
+	vec3 V = normalize(inViewVec);
+	vec3 R = reflect(-L, N);
+	float diffuse = max(dot(N, L), 0.0);
+	vec3 specular = pow(max(dot(R, V), 0.0), 16.0) * vec3(0.75);
+	outFragColor = vec4(diffuse * inColor + specular, 1.0);		
+}

data/shaders/imgui/scene.vert

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (location = 0) in vec3 inPos;
+layout (location = 1) in vec3 inNormal;
+layout (location = 2) in vec3 inColor;
+
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 model;
+	vec4 lightPos;
+} ubo;
+
+layout (location = 0) out vec3 outNormal;
+layout (location = 1) out vec3 outColor;
+layout (location = 2) out vec3 outViewVec;
+layout (location = 3) out vec3 outLightVec;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+};
+
+void main() 
+{
+	outNormal = inNormal;
+	outColor = inColor;
+	gl_Position = ubo.projection * ubo.model * vec4(inPos.xyz, 1.0);
+	
+	vec4 pos = ubo.model * vec4(inPos, 1.0);
+	outNormal = mat3(ubo.model) * inNormal;
+	vec3 lPos = mat3(ubo.model) * ubo.lightPos.xyz;
+	outLightVec = lPos - pos.xyz;
+	outViewVec = -pos.xyz;		
+}

data/shaders/imgui/ui.frag

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+#version 450
+
+layout (binding = 0) uniform sampler2D fontSampler;
+
+layout (location = 0) in vec2 inUV;
+layout (location = 1) in vec4 inColor;
+
+layout (location = 0) out vec4 outColor;
+
+void main() 
+{
+	outColor = inColor * texture(fontSampler, inUV);
+}

data/shaders/imgui/ui.vert

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+#version 450
+
+layout (location = 0) in vec2 inPos;
+layout (location = 1) in vec2 inUV;
+layout (location = 2) in vec4 inColor;
+
+layout (push_constant) uniform PushConstants {
+	vec2 scale;
+	vec2 translate;
+} pushConstants;
+
+layout (location = 0) out vec2 outUV;
+layout (location = 1) out vec4 outColor;
+
+out gl_PerVertex 
+{
+	vec4 gl_Position;   
+};
+
+void main() 
+{
+	outUV = inUV;
+	outColor = inColor;
+	gl_Position = vec4(inPos * pushConstants.scale + pushConstants.translate, 0.0, 1.0);
+}