Added runtime mip map generation examples (wip) (refs #178)

data/shaders/texturemipmapgen/texture.frag

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+#version 450
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout (set = 0, binding = 1) uniform texture2D textureColor;
+layout (set = 0, binding = 2) uniform sampler samplers[3];
+
+layout (location = 0) in vec2 inUV;
+layout (location = 1) in float inLodBias;
+layout (location = 2) in float inSamplerIndex;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main() 
+{
+	highp int samplerIndex = int(inSamplerIndex);
+	outFragColor = texture(sampler2D(textureColor, samplers[samplerIndex]), inUV, inLodBias);
+}

data/shaders/texturemipmapgen/texture.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 vec2 inUV;
+layout (location = 2) in vec3 inNormal;
+
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 model;
+	vec4 viewPos;
+	float lodBias;
+	float samplerIndex;
+} ubo;
+
+layout (location = 0) out vec2 outUV;
+layout (location = 1) out float outLodBias;
+layout (location = 2) out float outSamplerIndex;
+
+out gl_PerVertex 
+{
+	vec4 gl_Position;   
+};
+
+void main() 
+{
+	outUV = inUV;
+	outUV.s *= 10.0;
+	outLodBias = ubo.lodBias;
+	outSamplerIndex = ubo.samplerIndex;
+	gl_Position = ubo.projection * ubo.model * vec4(inPos, 1.0);
+}