void Font::drawText(std::string text, int startx, int starty, int color)
{
if(!textureID)
{
LOG(LogError) << "Error - tried to draw with Font that has no texture loaded!";
return;
}
const int triCount = text.length() * 2;
Vertex* vert = new Vertex[triCount * 3];
GLubyte* colors = new GLubyte[triCount * 3 * 4];
glBindTexture(GL_TEXTURE_2D, textureID);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//texture atlas width/height
float tw = (float)textureWidth;
float th = (float)textureHeight;
float x = (float)startx;
float y = starty + mMaxGlyphHeight * 1.1f * fontScale; //padding (another 0.5% is added to the bottom through the sizeText function)
int charNum = 0;
for(int i = 0; i < triCount * 3; i += 6, charNum++)
{
unsigned char letter = text[charNum];
if(letter < 32 || letter >= 128)
letter = 127; //print [X] if character is not standard ASCII
//order is bottom left, top right, top left
vert[i + 0].pos = Vector2<GLfloat>(x, y + (charData[letter].texH - charData[letter].bearingY) * fontScale);
vert[i + 1].pos = Vector2<GLfloat>(x + charData[letter].texW * fontScale, y - charData[letter].bearingY * fontScale);
vert[i + 2].pos = Vector2<GLfloat>(x, vert[i + 1].pos.y);
Vector2<int> charTexCoord(charData[letter].texX, charData[letter].texY);
Vector2<int> charTexSize(charData[letter].texW, charData[letter].texH);
vert[i + 0].tex = Vector2<GLfloat>(charTexCoord.x / tw, (charTexCoord.y + charTexSize.y) / th);
vert[i + 1].tex = Vector2<GLfloat>((charTexCoord.x + charTexSize.x) / tw, charTexCoord.y / th);
vert[i + 2].tex = Vector2<GLfloat>(vert[i + 0].tex.x, vert[i + 1].tex.y);
//next triangle (second half of the quad)
vert[i + 3].pos = vert[i + 0].pos;
vert[i + 4].pos = vert[i + 1].pos;
vert[i + 5].pos.x = vert[i + 1].pos.x;
vert[i + 5].pos.y = vert[i + 0].pos.y;
vert[i + 3].tex = vert[i + 0].tex;
vert[i + 4].tex = vert[i + 1].tex;
vert[i + 5].tex.x = vert[i + 1].tex.x;
vert[i + 5].tex.y = vert[i + 0].tex.y;
x += charData[letter].advX * fontScale;
}
Renderer::buildGLColorArray(colors, color, triCount * 3);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(2, GL_FLOAT, sizeof(Vertex), &vert[0].pos);
glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), &vert[0].tex);
glColorPointer(4, GL_UNSIGNED_BYTE, 0, colors);
glDrawArrays(GL_TRIANGLES, 0, triCount * 3);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
delete[] vert;
delete[] colors;
}
TextCache* Font::buildTextCache(const std::string& text, float offsetX, float offsetY, unsigned int color)
{
if(!textureID)
{
LOG(LogError) << "Error - tried to build TextCache with Font that has no texture loaded!";
return NULL;
}
const int triCount = text.length() * 2;
const int vertCount = triCount * 3;
TextCache::Vertex* vert = new TextCache::Vertex[vertCount];
GLubyte* colors = new GLubyte[vertCount * 4];
//texture atlas width/height
float tw = (float)textureWidth;
float th = (float)textureHeight;
float x = offsetX;
float y = offsetY + mMaxGlyphHeight * 1.1f * fontScale; //padding (another 0.5% is added to the bottom through the sizeText function)
int charNum = 0;
for(int i = 0; i < vertCount; i += 6, charNum++)
{
unsigned char letter = text[charNum];
if(letter < 32 || letter >= 128)
letter = 127; //print [X] if character is not standard ASCII
//the glyph might not start at the cursor position, but needs to be shifted a bit
const float glyphStartX = x + charData[letter].bearingX * fontScale;
//order is bottom left, top right, top left
vert[i + 0].pos << glyphStartX, y + (charData[letter].texH - charData[letter].bearingY) * fontScale;
vert[i + 1].pos << glyphStartX + charData[letter].texW * fontScale, y - charData[letter].bearingY * fontScale;
vert[i + 2].pos << glyphStartX, vert[i + 1].pos.y();
Eigen::Vector2i charTexCoord(charData[letter].texX, charData[letter].texY);
Eigen::Vector2i charTexSize(charData[letter].texW, charData[letter].texH);
vert[i + 0].tex << charTexCoord.x() / tw, (charTexCoord.y() + charTexSize.y()) / th;
vert[i + 1].tex << (charTexCoord.x() + charTexSize.x()) / tw, charTexCoord.y() / th;
vert[i + 2].tex << vert[i + 0].tex.x(), vert[i + 1].tex.y();
//next triangle (second half of the quad)
vert[i + 3].pos = vert[i + 0].pos;
vert[i + 4].pos = vert[i + 1].pos;
vert[i + 5].pos[0] = vert[i + 1].pos.x();
vert[i + 5].pos[1] = vert[i + 0].pos.y();
vert[i + 3].tex = vert[i + 0].tex;
vert[i + 4].tex = vert[i + 1].tex;
vert[i + 5].tex[0] = vert[i + 1].tex.x();
vert[i + 5].tex[1] = vert[i + 0].tex.y();
x += charData[letter].advX * fontScale;
}
TextCache* cache = new TextCache(vertCount, vert, colors, this);
if(color != 0x00000000)
cache->setColor(color);
return cache;
}
