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#include "text.hpp"
#include <SDL2/SDL_opengl.h>
#include <tuple>
struct FT_Info {
std::pair<float, float> wh;
std::pair<float, float> bl;
std::pair<float, float> ad;
GLuint tex;
FT_Info(void)
: tex(0) {}
};
//FT_Library freetype;
//std::map<std::string, FT_Face> fonts;
//std::map<std::string, std::vector<FT_Info>> fontData;
void TextSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events)
{
if (FT_Init_FreeType(&freetype) != 0) {
// TODO handle error
}
}
/**
* Draws the text for all entities.
*/
void TextSystem::update([[maybe_unused]] entityx::EntityManager& entites,
[[maybe_unused]] entityx::EventManager& events,
[[maybe_unused]] entityx::TimeDelta dt)
{
// TODO render each Text component's text
}
void TextSystem::loadFont(const std::string& name,
const std::string& file,
int size)
{
if (fonts.find(name) == fonts.end()) {
FT_Face face;
if (FT_New_Face(freetype, file.c_str(), 0, &face)) {
// TODO handle this error
}
fonts.emplace(name, face);
}
auto& face = fonts[name];
FT_Set_Pixel_Sizes(face, 0, size);
fontData.try_emplace(name, 95);
char c = 32;
for (auto& d : fontData[name]) {
FT_Load_Char(face, c++, FT_LOAD_RENDER);
glGenTextures(1, &d.tex);
glBindTexture(GL_TEXTURE_2D, d.tex);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S , GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T , GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER , GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER , GL_LINEAR);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// convert red-on-black to RGBA
auto& g = face->glyph;
std::vector<uint32_t> buf (g->bitmap.width * g->bitmap.rows, 0xFFFFFF);
for (auto j = buf.size(); j--;)
buf[j] |= g->bitmap.buffer[j] << 24;
d.wh = { g->bitmap.width, g->bitmap.rows };
d.bl = { g->bitmap_left, g->bitmap_top };
d.ad = { g->advance.x >> 6, g->advance.y >> 6 };
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, g->bitmap.width, g->bitmap.rows,
0, GL_RGBA, GL_UNSIGNED_BYTE, buf.data());
}
}
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