mkxp-freebird/shader/trans.frag

24 lines
597 B
GLSL

/* Fragment shader dealing with transitions */
uniform sampler2D currentScene;
uniform sampler2D frozenScene;
uniform sampler2D transMap;
/* Normalized */
uniform float prog;
/* Vague [0, 512] normalized */
uniform float vague;
void main()
{
vec2 texCoor = gl_TexCoord[0].st;
float transV = texture2D(transMap, texCoor).r;
float cTransV = clamp(transV, prog, prog+vague);
float alpha = (cTransV - prog) / vague;
vec4 newFrag = texture2D(currentScene, texCoor);
vec4 oldFrag = texture2D(frozenScene, texCoor);
gl_FragColor = mix(newFrag, oldFrag, alpha);
}