32 lines
618 B
GLSL
32 lines
618 B
GLSL
|
|
||
|
|
uniform sampler2D source;
|
||
|
|
uniform sampler2D destination;
|
||
|
|
|
||
|
|
uniform vec4 subRect;
|
||
|
|
|
||
|
|
uniform float opacity;
|
||
|
|
|
||
|
|
void main()
|
||
|
|
{
|
||
|
|
vec2 coor = gl_TexCoord[0].xy;
|
||
|
|
vec2 dstCoor = (coor - subRect.xy) * subRect.zw;
|
||
|
|
|
||
|
|
vec4 srcFrag = texture2D(source, coor);
|
||
|
|
vec4 dstFrag = texture2D(destination, dstCoor);
|
||
|
|
|
||
|
|
vec4 resFrag;
|
||
|
|
|
||
|
|
float ab = opacity;
|
||
|
|
const float as = srcFrag.a;
|
||
|
|
const float ad = dstFrag.a;
|
||
|
|
|
||
|
|
const float at = ab*as;
|
||
|
|
resFrag.a = at + ad - ad*at;
|
||
|
|
|
||
|
|
resFrag.rgb = mix(dstFrag.rgb, srcFrag.rgb, ab*as);
|
||
|
|
// resFrag.rgb /= (resFrag.a);
|
||
|
|
resFrag.rgb = mix(srcFrag.rgb, resFrag.rgb, ad*resFrag.a);
|
||
|
|
|
||
|
|
gl_FragColor = resFrag;
|
||
|
|
}
|