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#define BIT_RANGE(x) uint((1 << x) - 1)
/* 2 bits for corner */
/* Attention! Not the same order as in UI_interface.h!
* Ordered by drawing order. */
#define BOTTOM_LEFT 0u
#define BOTTOM_RIGHT 1u
#define TOP_RIGHT 2u
#define TOP_LEFT 3u
#define CNR_FLAG_RANGE BIT_RANGE(2)
/* 4bits for corner id */
#define CORNER_VEC_OFS 2u
#define CORNER_VEC_RANGE BIT_RANGE(4)
const vec2 cornervec[36] = vec2[36](
vec2(0.0, 1.0), vec2(0.02, 0.805), vec2(0.067, 0.617), vec2(0.169, 0.45), vec2(0.293, 0.293), vec2(0.45, 0.169), vec2(0.617, 0.076), vec2(0.805, 0.02), vec2(1.0, 0.0),
vec2(-1.0, 0.0), vec2(-0.805, 0.02), vec2(-0.617, 0.067), vec2(-0.45, 0.169), vec2(-0.293, 0.293), vec2(-0.169, 0.45), vec2(-0.076, 0.617), vec2(-0.02, 0.805), vec2(0.0, 1.0),
vec2(0.0, -1.0), vec2(-0.02, -0.805), vec2(-0.067, -0.617), vec2(-0.169, -0.45), vec2(-0.293, -0.293), vec2(-0.45, -0.169), vec2(-0.617, -0.076), vec2(-0.805, -0.02), vec2(-1.0, 0.0),
vec2(1.0, 0.0), vec2(0.805, -0.02), vec2(0.617, -0.067), vec2(0.45, -0.169), vec2(0.293, -0.293), vec2(0.169, -0.45), vec2(0.076, -0.617), vec2(0.02, -0.805), vec2(0.0, -1.0)
);
#define INNER_FLAG uint(1 << 10) /* is inner vert */
uniform mat4 ModelViewProjectionMatrix;
uniform vec4 parameters[4];
/* radi and rad per corner */
#define recti parameters[0]
#define rect parameters[1]
#define radsi parameters[2].x
#define rads parameters[2].y
#define roundCorners parameters[3]
in uint vflag;
out float shadowFalloff;
void main()
{
uint cflag = vflag & CNR_FLAG_RANGE;
uint vofs = (vflag >> CORNER_VEC_OFS) & CORNER_VEC_RANGE;
vec2 v = cornervec[cflag * 9u + vofs];
bool is_inner = (vflag & INNER_FLAG) != 0u;
shadowFalloff = (is_inner) ? 1.0 : 0.0;
/* Scale by corner radius */
v *= roundCorners[cflag] * ((is_inner) ? radsi : rads);
/* Position to corner */
vec4 rct = (is_inner) ? recti : rect;
if (cflag == BOTTOM_LEFT)
v += rct.xz;
else if (cflag == BOTTOM_RIGHT)
v += rct.yz;
else if (cflag == TOP_RIGHT)
v += rct.yw;
else /* (cflag == TOP_LEFT) */
v += rct.xw;
gl_Position = ModelViewProjectionMatrix * vec4(v, 0.0, 1.0);
}
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