[TextRenderer] center option

sarthou · Aug 16, 2024 · 23b475b · 23b475b
1 parent 1378b17
commit 23b475b
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Showing 3 changed files with 16 additions and 3 deletions.
diff --git a/include/overworld/Engine/Graphics/OpenGL/TextRenderer.h b/include/overworld/Engine/Graphics/OpenGL/TextRenderer.h
@@ -25,7 +25,7 @@ namespace owds {
 
     bool load(const std::string& font, unsigned int font_size);
 
-    void renderText(Shader& shader, const std::string& text, const glm::vec3& position, float height, const glm::vec3& color);
+    void renderText(Shader& shader, const std::string& text, const glm::vec3& position, float height, const glm::vec3& color, bool center = false);
 
   private:
     unsigned int vao_;

diff --git a/src/Engine/Graphics/OpenGL/Renderer.cpp b/src/Engine/Graphics/OpenGL/Renderer.cpp
@@ -414,7 +414,7 @@ namespace owds {
     text_shader.setMat4("projection", render_camera_.getProjectionMatrix());
     text_shader.setMat4("view", render_camera_.getViewMatrix());
 
-    text_renderer_.renderText(text_shader, "tesH", glm::vec3(0, 0, 5), 1, glm::vec3(1.f, 0.f, 1.f));
+    text_renderer_.renderText(text_shader, "tesH", glm::vec3(0, 0, 5), 1, glm::vec3(1.f, 0.f, 1.f), true);
 
     // 2. now blit multisampled buffer(s) to normal colorbuffer of intermediate FBO. Image is stored in screenTexture
     glDisable(GL_BLEND);

diff --git a/src/Engine/Graphics/OpenGL/TextRenderer.cpp b/src/Engine/Graphics/OpenGL/TextRenderer.cpp
@@ -88,7 +88,7 @@ namespace owds {
     return true;
   }
 
-  void TextRenderer::renderText(Shader& shader, const std::string& text, const glm::vec3& position, float height, const glm::vec3& color)
+  void TextRenderer::renderText(Shader& shader, const std::string& text, const glm::vec3& position, float height, const glm::vec3& color, bool center)
   {
     shader.use();
     shader.setVec3("text_color", color);
@@ -102,6 +102,19 @@ namespace owds {
     float y = position.y;
     float z = position.z;
 
+    if(center)
+    {
+      float width = 0;
+      std::string::const_iterator c;
+      for(c = text.begin(); c != text.end(); c++)
+      {
+        Character_t& ch = characters_[*c];
+        width += (ch.advance >> 6) * height; // bitshift by 6 to get value in pixels (1/64th times 2^6 = 64)
+      }
+
+      x -= width / 2.f;
+    }
+
     std::string::const_iterator c;
     for(c = text.begin(); c != text.end(); c++)
     {