Initial shader class & restructure
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251
src/TextRendering.cpp
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251
src/TextRendering.cpp
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#include <JGL/JGL.h>
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#if __linux__
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#include <freetype2/ft2build.h>
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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#endif
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#if _WIN32
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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#endif
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#include <JGL/types/Font.h>
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#include <JGL/types/FontCache.h>
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#include <jlog/jlog.hpp>
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namespace JGL {
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void PurgeFontCache() {
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fontCache.purgeCache();
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}
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void J2D::DrawString(const Color4& color, const std::string& text, float x, float y, float scale, u32 size, const Font& font) {
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glUseProgram(0); // Fixed-function pipeline.
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// Offset by height to render at "correct" location.
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y += size;
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CachedFont* cachedFont = fontCache.getFont(size, font.index);
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//Set up the regular font.
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//for (const auto &f : Font::GetLoadedFonts())
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// if (f.index == font.index)
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// font = f;
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if (font.face == nullptr)
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return;
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FT_Set_Pixel_Sizes(font.face, 0, size);
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//If the font doesn't exist in the cache yet.
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if (!cachedFont) {
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DEBUG("Caching font data...");
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GLuint texture_id;
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glGenTextures(1, &texture_id);
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glBindTexture(GL_TEXTURE_2D, texture_id);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
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GLsizei width = 0;
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GLsizei max_height = 0;
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FT_ULong charcode;
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FT_UInt gindex;
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//We have to loop over the available glyphs twice as we need the
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//final width and height of the texture_handle before we can construct it
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//and subsequently upload the glyph data.
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charcode = FT_Get_First_Char(font.face, &gindex);
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//Strings are char-based so we only handle charcodes within the extended ASCII range.
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while (gindex != 0 && charcode < 255) {
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if (FT_Load_Char(font.face, charcode, FT_LOAD_RENDER))
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std::cout << "Error::FREETYPE: Failed to load charcode: " << charcode << std::endl;
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FT_GlyphSlot g = font.face->glyph;
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width += g->bitmap.width;
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max_height = std::max(max_height, (GLsizei)g->bitmap.rows);
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charcode = FT_Get_Next_Char(font.face, charcode, &gindex);
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}
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fontCache.newFont(texture_id, width, max_height, size, font.index);
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cachedFont = fontCache.getFont(size, font.index);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, max_height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, nullptr);
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GLsizei xoffset = 0;
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charcode = FT_Get_First_Char(font.face, &gindex);
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while (gindex != 0 && charcode < 255) {
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if (FT_Load_Char(font.face, charcode, FT_LOAD_RENDER))
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std::cout << "Error::FREETYPE: Failed to load charcode: " << charcode << std::endl;
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FT_GlyphSlot g = font.face->glyph;
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glTexSubImage2D(GL_TEXTURE_2D, 0, xoffset, 0, g->bitmap.width, g->bitmap.rows, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
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GLfloat u0 = (GLfloat)xoffset / cachedFont->getTextureWidth();
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GLfloat u1 = u0 + (GLfloat)g->bitmap.width / cachedFont->getTextureWidth();
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GLfloat v0 = 0.0f;
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GLfloat v1 = (GLfloat)g->bitmap.rows / cachedFont->getTextureHeight();
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std::array<GLfloat, 12> texcoords = {
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u0, v0,
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u0, v1,
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u1, v1,
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u0, v0,
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u1, v1,
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u1, v0
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};
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cachedFont->appendGlyph(new CachedGlyph((char)charcode, texcoords, g->bitmap_left, g->bitmap_top, g->bitmap.width, g->bitmap.rows, (g->advance.x >> 6), (g->advance.y >> 6)));
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xoffset += g->bitmap.width;
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charcode = FT_Get_Next_Char(font.face, charcode, &gindex);
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}
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}
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glColor4f(color.r / 255.f, color.g / 255.f, color.b / 255.f, color.a / 255.f);
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//Texture parameters are restored when the texture_handle is bound
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glBindTexture(GL_TEXTURE_2D, *cachedFont->getTexture());
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std::vector<std::array<GLfloat, 12>> vertices(text.size());
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std::vector<std::array<GLfloat, 12>> texcoords(text.size());
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for (int i = 0; i < text.length(); i++) {
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float x2, y2, w, h;
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CachedGlyph *glyph = cachedFont->getGlyph(text.c_str()[i]);
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if (glyph == nullptr) continue;
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x2 = x + glyph->x2offset * scale;
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y2 = y - glyph->y2offset * scale; // Adjust y-coordinate
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w = glyph->w * scale;
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h = glyph->h * scale;
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x += glyph->advanceX * scale;
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y += glyph->advanceY * scale;
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std::array<GLfloat, 12> glyph_vertices = {
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x2, y2,
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x2, y2 + h,
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x2 + w, y2 + h,
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x2, y2,
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x2 + w, y2 + h,
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x2 + w, y2
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};
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auto glyph_texcoords = glyph->getTexCoords();
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vertices[i] = glyph_vertices;
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texcoords[i] = glyph_texcoords;
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}
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glVertexPointer(2, GL_FLOAT, sizeof(GLfloat) * 2, vertices.data());
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glTexCoordPointer(2, GL_FLOAT, sizeof(GLfloat) * 2, texcoords.data());
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glDrawArrays(GL_TRIANGLES, 0, vertices.size() * 6);
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glBindTexture(GL_TEXTURE_2D, 0);
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glColor4f(1, 1, 1, 1);
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}
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void J2D::DrawString(const Color3& color, const std::string& text, float x, float y, float scale, u32 size, const Font& font) {
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J2D::DrawString(Color4::FromColor3(color, 255), text, x, y, scale, size, font);
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}
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void J3D::DrawString(const Color4& color, const std::string& text, const Vector3& pos, const Vector3& angle, float scale, u32 size, const Font& font) {
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//TODO figure out what the scale should actually be mathematically.
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scale = scale * 0.002f;
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scale = -scale;
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float x = pos.x;
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float y = pos.y;
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float z = pos.z;
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std::vector<GLuint> textures(text.length());
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glUseProgram(0); // Fixed-function pipeline.
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glColor4ubv(color.ptr());
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//Font font;
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//for (auto& f : Font::GetLoadedFonts())
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//if (f.index == font.index)
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//font = f;
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if (font.face == NULL) {
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std::cout << "null font" << std::endl;
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return;
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}
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FT_Set_Pixel_Sizes(font.face, 0, size);
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glPushMatrix();
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glTranslatef(x, y, z);
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glRotatef(angle.x, 1.0f, 0.0f, 0.0f);
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glRotatef(angle.y, 0.0f, 1.0f, 0.0f);
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glRotatef(angle.z, 0.0f, 0.0f, 1.0f);
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x = 0;
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y = 0;
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z = 0;
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for (int i = 0; i < text.length(); i++)
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{
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if (FT_Load_Char(font.face, text.c_str()[i], FT_LOAD_RENDER))
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continue;
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FT_GlyphSlot g = font.face->glyph;
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glGenTextures(1, &textures.at(i));
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glBindTexture(GL_TEXTURE_2D, textures[i]);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, g->bitmap.width, g->bitmap.rows, 0, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
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float x2 = x + g->bitmap_left * scale;
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float y2 = y - g->bitmap_top * scale; // Adjust y-coordinate
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float z2 = z;
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float w = g->bitmap.width * scale;
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float h = g->bitmap.rows * scale;
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glBegin(GL_TRIANGLES);
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glTexCoord2f(0, 0);
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glVertex3f(x2, y2, z2);
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glTexCoord2f(0, 1);
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glVertex3f(x2, y2 + h, z2);
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glTexCoord2f(1, 1);
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glVertex3f(x2 + w, y2 + h, z2);
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glTexCoord2f(0, 0);
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glVertex3f(x2, y2, z2);
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glTexCoord2f(1, 1);
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glVertex3f(x2 + w, y2 + h, z2);
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glTexCoord2f(1, 0);
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glVertex3f(x2 + w, y2, z2);
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glEnd();
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x += (g->advance.x >> 6) * scale;
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y += (g->advance.y >> 6) * scale;
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}
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for (unsigned int& texture : textures)
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glDeleteTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, 0); // Unbind texture_handle
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glColor4f(1, 1, 1, 1);
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glPopMatrix();
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}
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}
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