mkxp/shader/trans.frag

24 lines
593 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;
varying vec2 v_texCoord;
void main()
{
float transV = texture2D(transMap, v_texCoord).r;
float cTransV = clamp(transV, prog, prog+vague);
float alpha = (cTransV - prog) / vague;
vec4 newFrag = texture2D(currentScene, v_texCoord);
vec4 oldFrag = texture2D(frozenScene, v_texCoord);
gl_FragColor = mix(newFrag, oldFrag, alpha);
}