#version 300 es
precision highp float;
uniform vec4 u_rtMetrics;
#define SMAA_RT_METRICS u_rtMetrics
#define SMAA_GLSL_3 1
#define SMAA_PRESET_HIGH 1
#define SMAA_INCLUDE_VS 0
#include "SMAA.hlsl"
uniform mediump sampler2D u_tex;   // tonemapped, gamma-encoded LDR — luma edge detection requires gamma-corrected colors
in vec2 vTexCoord;
in vec4 vOffset[3];
out vec4 fragColor;
void main() {
    fragColor = vec4(SMAALumaEdgeDetectionPS(vTexCoord, vOffset, u_tex), 0.0, 1.0);
}