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#include "UI9Slicing.h"
#include "Runtime/Math/MathHelper.h"
#include <cstring>
using namespace std;
static vector<UIVertexLayout> s_Vertices;
static vector<UIIndex> s_Indices;
UI9Slicing::UI9Slicing(int mode, Vector2 horizontal, Vector2 vertical, Vector2 texPixelSize, Vector2 size)
{
m_Slicing = mode;
m_Horizontal = horizontal.Clamp(0, texPixelSize.x, 0, texPixelSize.x);
m_Vertical = vertical.Clamp(0, texPixelSize.y, 0, texPixelSize.y);
if (m_Horizontal[0] + m_Horizontal[1] > texPixelSize.x || m_Vertical[0] + m_Vertical[1] > texPixelSize.y)
{
throw UIMeshException("UI9Slicing wrong parameter.");
}
m_TexSize = texPixelSize;
m_Size = size;
}
void UI9Slicing::Draw()
{
s_Indices.clear();
s_Vertices.clear();
Vector2 tileSize = Vector2(m_TexSize.x - m_Horizontal[0] - m_Horizontal[1], m_TexSize.y - m_Vertical[0] - m_Vertical[1]);
Vector2 fillSize = Vector2(m_Size.x - m_Horizontal[0] - m_Horizontal[1], m_Size.y - m_Vertical[0] - m_Vertical[1]);
// horizonal和vertical对应的uv，注意uv在左下角，mesh在左上角
Vector2 tileUVx = Vector2(m_Horizontal[0] / m_TexSize.x, (m_TexSize.x - m_Horizontal[1]) / m_TexSize.x);
Vector2 tileUVy = Vector2((m_TexSize.y - m_Vertical[0]) / m_TexSize.y, m_Vertical[1] / m_TexSize.y);
// fill vertices
int row = 2 + ((fillSize.y <= 0) ? 0 : (m_Slicing == Slicing_Simple ? 2 : ceilf((float)fillSize.y / tileSize.y) + 1));
int colum = 2 + ((fillSize.x <= 0) ? 0 : (m_Slicing == Slicing_Simple ? 2 : ceilf((float)fillSize.x / tileSize.x) + 1));
for (int r = 0; r < row; ++r)
{
UIVertexLayout vert;
vert.color = Color32::white;
if (r == 0)
{
vert.position.y = 0;
vert.uv.y = 1;
}
else if (r == row - 1)
{
vert.position.y = m_Size.y;
vert.uv.y = 0;
}
else {
if (m_Slicing == Slicing_Tiled) {
vert.position.y = clamp(m_Vertical[0] + (r - 1) * tileSize.y, m_Vertical[0], m_Size.y - m_Vertical[1]);
vert.uv.y = odd(r - 1) ? tileUVy[1] : tileUVy[0];
} else {
vert.position.y = odd(r - 1) ? m_Size.y - m_Vertical[1] : m_Vertical[0];
vert.uv.y = odd(r - 1) ? tileUVy[1] : tileUVy[0];
}
}
for (int c = 0; c < colum; ++c)
{
if (c == 0)
{
vert.position.x = 0;
vert.uv.x = 0;
}
else if (c == colum - 1)
{
vert.position.x = m_Size.x;
vert.uv.x = 1;
}
else {
if (m_Slicing == Slicing_Tiled) {
vert.position.x = clamp(m_Horizontal[0] + (c - 1) * tileSize.x, m_Horizontal[0], m_Size.x - m_Horizontal[0]);
vert.uv.x = odd(c - 1) ? tileUVx[1] : tileUVx[0];
} else {
vert.position.x = odd(c - 1) ? (m_Size.x - m_Horizontal[1]) : m_Horizontal[0];
vert.uv.x = odd(c - 1) ? tileUVx[1] : tileUVx[0];
}
}
s_Vertices.push_back(vert);
if (c < colum - 1 && r < row - 1) {
int index = c + r * colum;
s_Indices.push_back(index); s_Indices.push_back(index + colum); s_Indices.push_back(index + colum + 1);
s_Indices.push_back(index + colum + 1); s_Indices.push_back(index + 1); s_Indices.push_back(index);
}
}
}
void* vb;
void* ib;
int vertCount = s_Vertices.size();
int indicesCount = s_Indices.size();
g_SharedVBO.GetChunk(sizeof(UIVertexLayout), sizeof(UIIndex), vertCount, indicesCount, Primitive_Triangle, &vb, &ib);
memcpy(vb, &s_Vertices[0], vertCount * sizeof(UIVertexLayout));
memcpy(ib, &s_Indices[0], indicesCount* sizeof(UIIndex));
s_Indices.resize(0);
s_Vertices.resize(0);
g_SharedVBO.ReleaseChunk(vertCount, indicesCount);
g_SharedVBO.DrawChunk(s_UIVertexLayout);
}
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