OpenGL FXAA issues
OpenGL FXAA issues
我是一名计算机科学专业的学生,我目前正在为我的课程做一个2d游戏。我知道这是不必要的,但我尝试着为游戏的AA执行FXAA算法。我使用的着色器是这个,因为我认为使用一个简单的碎片着色器就可以了。我也可以在Github上找到。
#version 120
#define FXAA_REDUCE_MIN (1.0/128.0)
#define FXAA_REDUCE_MUL (1.0/8.0)
#define FXAA_SPAN_MAX 8.0
uniform sampler2D sampler0;
uniform vec2 resolution;
void main(){
vec2 inverse_resolution=vec2(1.0/resolution.x,1.0/resolution.y);
vec3 rgbNW = texture2D(sampler0, (gl_FragCoord.xy + vec2(-1.0,-1.0)) * inverse_resolution).xyz;
vec3 rgbNE = texture2D(sampler0, (gl_FragCoord.xy + vec2(1.0,-1.0)) * inverse_resolution).xyz;
vec3 rgbSW = texture2D(sampler0, (gl_FragCoord.xy + vec2(-1.0,1.0)) * inverse_resolution).xyz;
vec3 rgbSE = texture2D(sampler0, (gl_FragCoord.xy + vec2(1.0,1.0)) * inverse_resolution).xyz;
vec3 rgbM = texture2D(sampler0, gl_FragCoord.xy * inverse_resolution).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 * FXAA_REDUCE_MUL),FXAA_REDUCE_MIN);
float rcpDirMin = 1.0/(min(abs(dir.x), abs(dir.y)) + dirReduce);
dir = min(vec2( FXAA_SPAN_MAX, FXAA_SPAN_MAX),max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX),dir * rcpDirMin)) * inverse_resolution;
vec3 rgbA = 0.5 * (texture2D(sampler0, gl_FragCoord.xy * inverse_resolution + dir * (1.0/3.0 - 0.5)).xyz + texture2D(sampler0, gl_FragCoord.xy * inverse_resolution + dir * (2.0/3.0 - 0.5)).xyz);
vec3 rgbB = rgbA * 0.5 + 0.25 * (texture2D(sampler0, gl_FragCoord.xy * inverse_resolution + dir * - 0.5).xyz + texture2D(sampler0, gl_FragCoord.xy * inverse_resolution + dir * 0.5).xyz);
float lumaB = dot(rgbB, luma);
if((lumaB < lumaMin) || (lumaB > lumaMax)) {
gl_FragColor = vec4(rgbA,1.0);
} else {
gl_FragColor = vec4(rgbB,1.0);
}
}
我遇到的问题是,每当我把我的屏幕上的着色器翻转过来…怎么解呢?这可能是因为正投影的问题,但我只是一个学生,所以我想不出解决办法。
这似乎是一个纹理坐标问题。使用1-V
而不是V
来翻转镜像
vec2 correctedFragCoord;
correctedFragCoord.x = gl_FragCoord.x;
correctedFragCoord.y = resolution.y - gl_FragCoord.y;
然后将着色器中的gl_FragCoord
替换为correctedFragCoord
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