You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.7 KiB
GLSL
85 lines
2.7 KiB
GLSL
#extension GL_EXT_gpu_shader4 : enable
|
|
|
|
uniform sampler2D DiffuseSampler;
|
|
uniform vec2 OutSize;
|
|
|
|
uniform float VxOffset;
|
|
uniform float SpanMax;
|
|
uniform float ReduceMul;
|
|
|
|
varying vec2 texCoord;
|
|
varying vec4 posPos;
|
|
|
|
#define FxaaTex(t, p) texture2D(t, p)
|
|
|
|
#if __VERSION__ >= 130
|
|
#define OffsetVec(a, b) ivec2(a, b)
|
|
#define FxaaTexOff(t, p, o, r) textureOffset(t, p, o)
|
|
#elif defined(GL_EXT_gpu_shader4)
|
|
#define OffsetVec(a, b) ivec2(a, b)
|
|
#define FxaaTexOff(t, p, o, r) texture2DLodOffset(t, p, 0.0, o)
|
|
#else
|
|
#define OffsetVec(a, b) vec2(a, b)
|
|
#define FxaaTexOff(t, p, o, r) texture2D(t, p + o * r)
|
|
#endif
|
|
|
|
vec3 FxaaPixelShader(
|
|
vec4 posPos, // Output of FxaaVertexShader interpolated across screen.
|
|
sampler2D tex, // Input texture.
|
|
vec2 rcpFrame) // Constant {1.0/frameWidth, 1.0/frameHeight}.
|
|
{
|
|
|
|
#define FXAA_REDUCE_MIN (1.0/128.0)
|
|
//#define FXAA_REDUCE_MUL (1.0/8.0)
|
|
//#define FXAA_SPAN_MAX 8.0
|
|
|
|
vec3 rgbNW = FxaaTex(tex, posPos.zw).xyz;
|
|
vec3 rgbNE = FxaaTexOff(tex, posPos.zw, OffsetVec(1,0), rcpFrame.xy).xyz;
|
|
vec3 rgbSW = FxaaTexOff(tex, posPos.zw, OffsetVec(0,1), rcpFrame.xy).xyz;
|
|
vec3 rgbSE = FxaaTexOff(tex, posPos.zw, OffsetVec(1,1), rcpFrame.xy).xyz;
|
|
|
|
vec3 rgbM = FxaaTex(tex, posPos.xy).xyz;
|
|
|
|
vec3 luma = vec3(0.299, 0.587, 0.114);
|
|
float lumaNW = dot(rgbNW, luma);
|
|
float lumaNE = dot(rgbNE, luma);
|
|
float lumaSW = dot(rgbSW, luma);
|
|
float lumaSE = dot(rgbSE, luma);
|
|
float lumaM = dot(rgbM, luma);
|
|
|
|
float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE)));
|
|
float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE)));
|
|
|
|
vec2 dir;
|
|
dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE));
|
|
dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE));
|
|
|
|
float dirReduce = max(
|
|
(lumaNW + lumaNE + lumaSW + lumaSE) * (0.25 * ReduceMul),
|
|
FXAA_REDUCE_MIN);
|
|
float rcpDirMin = 1.0/(min(abs(dir.x), abs(dir.y)) + dirReduce);
|
|
dir = min(vec2( SpanMax, SpanMax),
|
|
max(vec2(-SpanMax, -SpanMax),
|
|
dir * rcpDirMin)) * rcpFrame.xy;
|
|
|
|
vec3 rgbA = (1.0/2.0) * (
|
|
FxaaTex(tex, posPos.xy + dir * vec2(1.0/3.0 - 0.5)).xyz +
|
|
FxaaTex(tex, posPos.xy + dir * vec2(2.0/3.0 - 0.5)).xyz);
|
|
vec3 rgbB = rgbA * (1.0/2.0) + (1.0/4.0) * (
|
|
FxaaTex(tex, posPos.xy + dir * vec2(0.0/3.0 - 0.5)).xyz +
|
|
FxaaTex(tex, posPos.xy + dir * vec2(3.0/3.0 - 0.5)).xyz);
|
|
|
|
float lumaB = dot(rgbB, luma);
|
|
|
|
if ((lumaB < lumaMin) || (lumaB > lumaMax)) {
|
|
return rgbA;
|
|
} else {
|
|
return rgbB;
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
vec4 baseTexel = texture2D(DiffuseSampler, posPos.xy);
|
|
gl_FragColor = vec4(FxaaPixelShader(posPos, DiffuseSampler, 1.0 / OutSize), baseTexel.a);
|
|
}
|