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"#if VER <= 300\n"
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"#define layout(x)\n"
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"#endif\n"
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"#if VER < 300\n"
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"#define out attribute\n"
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"#define in varying\n"
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"#define texture texture2D\n"
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"#endif\n"
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"#if VER >= 130\n"
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"precision mediump float;\n"
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"#endif\n"
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"#if ATTR_TEXCOORD0\n"
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"uniform sampler2D uTex0;\n"
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"#endif\n"
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"#if ATTR_TEXCOORD1\n"
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"uniform sampler2D uTex1;\n"
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"#endif\n"
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"#if FEAT_ALPHA_TEST\n"
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"uniform float uAlphaTest;\n"
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"#endif\n"
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"#if FEAT_FOG\n"
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"uniform vec4 uFog;\n"
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"#endif\n"
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"uniform vec4 uColor;\n"
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"#if ATTR_COLOR\n"
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"in vec4 vColor;\n"
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"#endif\n"
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"#if ATTR_TEXCOORD0\n"
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"in vec2 vTexCoord0;\n"
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"#endif\n"
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"#if ATTR_TEXCOORD1\n"
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"in vec2 vTexCoord1;\n"
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"#endif\n"
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"#if ATTR_NORMAL\n"
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"in vec2 vNormal;\n"
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"#endif\n"
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"#if VER >= 300\n"
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"out vec4 oFragColor;\n"
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"#else\n"
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"#define oFragColor gl_FragColor\n"
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"#endif\n"
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"void main()\n"
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"{\n"
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"#if ATTR_COLOR\n"
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"vec4 c = vColor;\n"
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"#else\n"
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"vec4 c = uColor;\n"
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"#endif\n"
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"#if ATTR_TEXCOORD0\n"
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"c = c * texture(uTex0, vTexCoord0);\n"
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"#endif\n"
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"#if ATTR_TEXCOORD1\n"
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"c = c * texture(uTex1, vTexCoord1);\n"
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"#endif\n"
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"#if FEAT_ALPHA_TEST\n"
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"if(c.a <= uAlphaTest)\n"
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"discard;\n"
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"#endif\n"
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"#if FEAT_FOG\n"
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"float fogDist = gl_FragCoord.z / gl_FragCoord.w;\n"
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"float fogRate = clamp(exp(-uFog.w * fogDist), 0.f, 1.f);\n"
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"c.rgb = mix(uFog.rgb, c.rgb, fogRate);\n"
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"#endif\n"
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"oFragColor = c;\n"
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"}\n"
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