TexturePtr LightView::generateLightBubble(float centerFactor)
{
int bubbleRadius = 256;
int centerRadius = bubbleRadius * centerFactor;
int bubbleDiameter = bubbleRadius * 2;
ImagePtr lightImage = ImagePtr(new Image(Size(bubbleDiameter, bubbleDiameter)));
for(int x = 0; x < bubbleDiameter; x++) {
for(int y = 0; y < bubbleDiameter; y++) {
float radius = std::sqrt((bubbleRadius - x)*(bubbleRadius - x) + (bubbleRadius - y)*(bubbleRadius - y));
float intensity = stdext::clamp<float>((bubbleRadius - radius) / (float)(bubbleRadius - centerRadius), 0.0f, 1.0f);
// light intensity varies inversely with the square of the distance
intensity = intensity * intensity;
uint8_t colorByte = intensity * 0xff;
uint8_t pixel[4] = {colorByte,colorByte,colorByte,0xff};
lightImage->setPixel(x, y, pixel);
}
}
TexturePtr tex = TexturePtr(new Texture(lightImage, true));
tex->setSmooth(true);
return tex;
}
void PainterShaderProgram::addMultiTexture(const std::string& file)
{
if(m_multiTextures.size() > 3)
g_logger.error("cannot add more multi textures to shader, the max is 3");
TexturePtr texture = g_textures.getTexture(file);
if(!texture)
return;
texture->setSmooth(true);
texture->setRepeat(true);
m_multiTextures.push_back(texture);
}
TexturePtr TextureManager::getTexture(const std::string& fileName)
{
TexturePtr texture;
// before must resolve filename to full path
std::string filePath = g_resources.resolvePath(fileName);
// check if the texture is already loaded
auto it = m_textures.find(filePath);
if(it != m_textures.end()) {
texture = it->second;
}
// texture not found, load it
if(!texture) {
try {
std::string filePathEx = g_resources.guessFilePath(filePath, "png");
// load texture file data
std::stringstream fin;
g_resources.readFileStream(filePathEx, fin);
texture = loadTexture(fin);
} catch(stdext::exception& e) {
g_logger.error(stdext::format("Unable to load texture '%s': %s", fileName, e.what()));
texture = g_textures.getEmptyTexture();
}
if(texture) {
texture->setTime(stdext::time());
texture->setSmooth(true);
m_textures[filePath] = texture;
}
}
return texture;
}
