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#include "../Graphics/CustomVertexLayout.h"
#include "Runtime/Utilities/StaticInitiator.h"
#include "../Math/Math.h"
#include "../Graphics/Color.h"
#include "UITextMesh.h"
#include "../Graphics/DefaultVertexLayout.h"
#include "Runtime/Debug/Log.h"
#include <vector>
#include <unordered_map>
#include "Runtime/Graphics/GfxDevice.h"
using namespace std;
struct TextMeshVBOLayout
{
Vector2 position;
Vector2 uv;
Color32 color;
};
static CustomVertexLayout s_TextMeshVBOLayout;
static unsigned int s_VertexPerText;
static unsigned int s_SizePerVertex;
static unsigned int s_SizePerText;
static unsigned int s_SizePerIndex;
static unsigned int s_IndicesPerText;
struct TextInfo {
const Character* ch;
float offset;
};
static unordered_map<unsigned int, vector<TextInfo>> s_TextInfos;
InitializeStaticVariables([]() {
VertexAttributeDescriptor POSITION = VertexAttributeDescriptor(0, 2, VertexAttrFormat_Float, sizeof(TextMeshVBOLayout));
VertexAttributeDescriptor UV = VertexAttributeDescriptor(sizeof(Vector2), 2, VertexAttrFormat_Float, sizeof(TextMeshVBOLayout));
VertexAttributeDescriptor COLOR = VertexAttributeDescriptor(sizeof(Vector2)*2, 4, VertexAttrFormat_Unsigned_Byte, sizeof(TextMeshVBOLayout), true);
s_TextMeshVBOLayout.attributes.push_back(POSITION);
s_TextMeshVBOLayout.attributes.push_back(UV);
s_TextMeshVBOLayout.attributes.push_back(COLOR);
s_VertexPerText = 4;
s_SizePerVertex = sizeof(TextMeshVBOLayout);
s_IndicesPerText = 6;
s_SizePerIndex = VertexLayout::GetDefaultIndexSize();
s_SizePerText = sizeof(TextMeshVBOLayout) * 4;
});
// 一段文字里面的网格可能会来自不同的atlas，在生成UITextMesh时做好合批
// 需要支持
// * 大小
// * 锚点
// * 对齐方式
// * 换行
// * 颜色
UITextMesh::UITextMesh(const UnicodeString& str, Font* font,int pixelSize, ETextAnchor anchor, ETextAlignment alignment)
{
m_Font = font;
s_TextInfos.clear();
const Vector2 atlasSize = font->GetAtlasSize();
// 按照不同的atlas分类到s_TextInfos
float offset = 0;
for (int i = 0; i < str.length; ++i)
{
character::Codepoint c = str.str[i];
const Character* ch = font->GetCharacter(c, pixelSize);
if (ch == NULL)
continue;
unsigned int atlasIndex = ch->atlas;
if (atlasIndex != FONT_NOT_IN_ATLAS_PLACEHOLDER) //非空格
{
TextInfo info;
info.ch = ch;
info.offset = offset;
auto list = s_TextInfos.find(atlasIndex);
if (list == s_TextInfos.end())
s_TextInfos.insert(std::pair<unsigned int, vector<TextInfo>>(atlasIndex, vector<TextInfo>()));
vector<TextInfo>& v = s_TextInfos[atlasIndex];
v.push_back(info);
}
offset += ch->advance;
}
if (s_TextInfos.size() == 0)
return;
// 填充VBO和IBO
for (auto iter : s_TextInfos) {
unsigned int atlasIndex = iter.first; // atlas atlasIndex
vector<TextInfo>& texts = iter.second;
int textCount = texts.size();
VertexBuffer* vb = new VertexBuffer(textCount * s_SizePerText, textCount * s_IndicesPerText * s_SizePerIndex, VertexBuffer::VertexBufferType_Static);
void* pVB;
uint16* pIB;
vb->GetChunk(s_SizePerVertex, s_SizePerIndex, s_VertexPerText * textCount, s_IndicesPerText * textCount, EPrimitive::Primitive_Triangle, &pVB,(void**) &pIB);
TextMeshVBOLayout* dst = (TextMeshVBOLayout*)pVB;
for (int i = 0; i < textCount; ++i)
{
TextInfo& text = texts[i];
int vOff = i * s_VertexPerText;
// 左上角是原点
float pos[] = {
text.offset + text.ch->bearing.x, pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-left
text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y + text.ch->position.height, // bottom-right
text.offset + text.ch->bearing.x + text.ch->position.width, pixelSize - text.ch->bearing.y, // top-right
text.offset + text.ch->bearing.x, pixelSize - text.ch->bearing.y, // top-left
};
Vector4 uvQuad = Vector4(text.ch->position.x / atlasSize.x, text.ch->position.y / atlasSize.y, text.ch->position.width / atlasSize.x, text.ch->position.height / atlasSize.y);
float uv[] = {
uvQuad.x, uvQuad.y + uvQuad.w,
uvQuad.x + uvQuad.z, uvQuad.y + uvQuad.w,
uvQuad.x + uvQuad.z, uvQuad.y,
uvQuad.x, uvQuad.y,
};
for (int j = 0; j < s_VertexPerText; ++j)
{
dst[vOff + j].position.Set(pos[2 * j], pos[2 * j + 1]);
dst[vOff + j].uv.Set(uv[2 * j], uv[2 * j + 1]);
dst[vOff + j].color.Set(255 , 255, 255, 255);
}
int iOff = i * s_IndicesPerText;
int indices[] = {
0, 1, 3, // right-top
1, 2, 3, // left-bottom
};
for (int j = 0; j < s_IndicesPerText; ++j)
pIB[iOff + j] = vOff + indices[j];
}
vb->FlushChunk(s_VertexPerText * textCount, s_IndicesPerText * textCount);
m_VBOs.insert(std::pair<int, VertexBuffer*>(atlasIndex, vb));
}
WipeGLError();
}
void UITextMesh::Draw()
{
for (auto subText : m_VBOs)
{
int atlasIndex = subText.first; // atlasIndex of atlas
VertexBuffer* vbo = subText.second;
const GlyphAtals* atlas = m_Font->GetGlyphAtlas(atlasIndex);
if (atlas == NULL)
{
log_error("Render text failed, no glyph atlas.");
continue;
}
g_GfxDevice.SetUniformTexture("gamelab_main_tex", atlas->altas);
CheckGLError(
throw GLException(error);
);
vbo->Draw(s_TextMeshVBOLayout);
CheckGLError(
throw GLException(error);
);
g_GfxDevice.ResetUniformsState();
}
}
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