shmup
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223
application/include/overlay.hpp
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223
application/include/overlay.hpp
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#ifndef OVERLAY_HPP
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#define OVERLAY_HPP
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/*
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"""
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Portions of this software are copyright © 2025 The FreeType
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Project (https://freetype.org). All rights reserved.
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"""
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*/
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#include <glm/ext/matrix_clip_space.hpp>
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#include <open_engine.hpp>
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#include "freetype/fttypes.h"
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#include "open_engine/events/event.hpp"
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#include "open_engine/logging.hpp"
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#include "open_engine/renderer/shader.hpp"
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#include <freetype2/ft2build.h>
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#include FT_FREETYPE_H
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#include <glad/glad.h>
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#include <map>
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struct Character {
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unsigned int texture_id; // ID handle of the glyph texture
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glm::ivec2 size; // Size of glyph
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glm::ivec2 bearing; // Offset from baseline to left/top of glyph
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FT_Long advance; // Offset to advance to next glyph
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};
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class Overlay : public OpenEngine::Layer
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{
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public:
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Overlay()
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{};
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~Overlay() {};
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void RenderText(std::string text, float x, float y, float scale, glm::vec3 color)
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{
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// activate corresponding render state
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text_shader->Bind();
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text_shader->SetVec3("textColor", glm::vec3(color.x, color.y, color.z));
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glActiveTexture(GL_TEXTURE0);
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glBindVertexArray(VAO);
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// iterate through all characters
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std::string::const_iterator c;
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for (c = text.begin(); c != text.end(); c++)
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{
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Character ch = characters[*c];
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float xpos = x + ch.bearing.x * scale;
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float ypos = y - (ch.size.y - ch.bearing.y) * scale;
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float w = ch.size.x * scale;
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float h = ch.size.y * scale;
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// update VBO for each character
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float vertices[6][4] = {
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{ xpos, ypos + h, 0.0f, 0.0f },
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{ xpos, ypos, 0.0f, 1.0f },
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{ xpos + w, ypos, 1.0f, 1.0f },
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{ xpos, ypos + h, 0.0f, 0.0f },
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{ xpos + w, ypos, 1.0f, 1.0f },
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{ xpos + w, ypos + h, 1.0f, 0.0f }
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};
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// render glyph texture over quad
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glBindTexture(GL_TEXTURE_2D, ch.texture_id);
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// update content of VBO memory
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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// render quad
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glDrawArrays(GL_TRIANGLES, 0, 6);
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// now advance cursors for next glyph (note that advance is number of 1/64 pixels)
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x += (ch.advance >> 6) * scale; // bitshift by 6 to get value in pixels (2^6 = 64)
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}
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glBindVertexArray(0);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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glm::vec2 GetTextSize(const std::string& text, float scale)
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{
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float width = 0.0f;
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float height = 0.0f;
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for (char c : text)
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{
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Character ch = characters[c];
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width += (ch.advance >> 6) * scale; // Accumulate total width
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// Track the maximum height
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float char_height = ch.size.y * scale;
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if (char_height > height)
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height = char_height;
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}
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return glm::vec2(width, height);
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}
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void RenderTextCentered(std::string text, float center_x, float center_y, float scale, glm::vec3 color)
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{
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glm::vec2 text_size = GetTextSize(text, scale);
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// Calculate top-left position to make text centered
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float x = center_x - (text_size.x / 2.0f);
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float y = center_y - (text_size.y / 2.0f);
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RenderText(text, x, y, scale, color);
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}
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private:
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void OnAttach() override
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{
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OE_INFO("Loading Freetype...");
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int error;
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FT_Library ft;
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error = FT_Init_FreeType(&ft);
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if (error != 0) {
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OE_ERROR("FREETYPE: Could not init FreeType Library");
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return;
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}
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FT_Face face;
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error = FT_New_Face(ft, "/usr/share/fonts/TTF/JetBrainsMono-Regular.ttf", 0, &face);
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if (error != 0) {
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OE_ERROR("FREETYPE: Failed to load font");
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return;
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}
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FT_Set_Pixel_Sizes(face, 0, 48);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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for (unsigned char c = 0; c < 128; c++)
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{
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// load character glyph
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if (FT_Load_Char(face, c, FT_LOAD_RENDER))
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{
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OE_ERROR("FREETYTPE: Failed to load Glyph: {}", c);
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continue;
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}
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// generate texture
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unsigned int texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(
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GL_TEXTURE_2D,
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0,
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GL_RED,
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face->glyph->bitmap.width,
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face->glyph->bitmap.rows,
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0,
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GL_RED,
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GL_UNSIGNED_BYTE,
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face->glyph->bitmap.buffer
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);
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// set texture options
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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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// now store character for later use
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Character character = {
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texture,
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glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
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glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
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face->glyph->advance.x
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};
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characters.insert(std::pair<char, Character>(c, character));
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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FT_Done_Face(face);
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FT_Done_FreeType(ft);
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text_shader = OpenEngine::Shader::Create("assets/shaders/text.glsl");
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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};
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void OnUpdate() override
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{
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text_shader->Bind();
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int width = OpenEngine::Application::Get().GetWindow().GetWidth();
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int height = OpenEngine::Application::Get().GetWindow().GetHeight();
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projection = glm::ortho(0.0f, static_cast<float>(width),
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0.0f, static_cast<float>(height));
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text_shader->SetMat4("u_ViewProjection", projection);
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float x = height - 40;
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float y = 0;
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//RenderText("Test String", 0.0f, 0.0f, 1.0f, {0.8f, 0.3f, 0.2f});
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};
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void OnEvent(OpenEngine::Event& event) override
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{
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};
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private:
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std::map<char, Character> characters;
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OpenEngine::Ref<OpenEngine::Shader> text_shader;
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glm::mat4 projection;
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unsigned int VAO, VBO;
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};
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#endif // OVERLAY_HPP
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