From cb3786b5085d6f19bc857356cee9b4bc05febefc Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Tue, 20 Oct 2026 15:36:16 -0400
Subject: [PATCH] First ability to render slide text.

---
 src/main.cpp   | 49 ++++++++++++++++++++++++-------------------------
 src/render.cpp | 24 +++++++++++++++++++++---
 src/render.hpp | 16 +++++++++++++---
 3 files changed, 58 insertions(+), 31 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 1d8e0cf..8699913 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,9 +8,7 @@
 #include <GLFW/glfw3.h>
 #include "config.hpp"
 #include "render.hpp"
-
-float mouse_x = 0;
-float mouse_y = 0;
+#include "bezos.hpp"
 
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
 
@@ -31,12 +29,25 @@ void framebuffer_size_callback(GLFWwindow *, int width, int height) {
 }
 
 void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
-  fmt::println("mouse click: {},{}", xpos, ypos);
-  mouse_x = xpos;
-  mouse_y = ypos;
+  Engine* engine = static_cast<Engine*>(glfwGetWindowUserPointer(window));
+  engine->mouse(xpos, ypos);
 }
 
-void scroll_callback(GLFWwindow *window, double xoffset, double yoffset) {
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+  Engine* engine = static_cast<Engine*>(glfwGetWindowUserPointer(window));
+
+  if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
+    glfwSetWindowShouldClose(window, true);
+  }
+
+  if (key == GLFW_KEY_W && action == GLFW_PRESS) {
+    engine->change_slide(-1);
+  }
+
+  if (key == GLFW_KEY_S && action == GLFW_PRESS) {
+    engine->change_slide(1);
+  }
 }
 
 GLFWwindow* create_window() {
@@ -51,26 +62,13 @@ GLFWwindow* create_window() {
   dbc::check(good, "failed to load GLAD");
 
   glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
   glfwSetCursorPosCallback(window, mouse_callback);
-  glfwSetScrollCallback(window, scroll_callback);
+  glfwSetKeyCallback(window, key_callback);
 
   return window;
 }
 
-void process_input(GLFWwindow *window) {
-  if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
-    glfwSetWindowShouldClose(window, true);
-  }
-
-  if(glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
-    fmt::println("move window left");
-  }
-
-  if(glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
-    fmt::println("move window left");
-  }
-}
-
 void setup() {
   glEnable(GL_DEPTH_TEST);
   glEnable(GL_BLEND);
@@ -84,7 +82,6 @@ void setup() {
 
 void update(GLFWwindow* window) {
   glfwPollEvents();
-  process_input(window);
 }
 
 void render(GLFWwindow* window, Engine &state) {
@@ -102,9 +99,11 @@ int main() {
 
   auto window = create_window();
   setup();
-  Engine state;
+  Deck deck = Bezos::load("lua/builder_test.lua");
+
+  Engine state(deck);
 
-  // glfwSetWindowUserPointer(window, scene.get());
+  glfwSetWindowUserPointer(window, &state);
 
   while(!glfwWindowShouldClose(window)) {
     update(window);
diff --git a/src/render.cpp b/src/render.cpp
index ec99ba6..5b1b315 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -1,7 +1,10 @@
 #include "render.hpp"
 #include "config.hpp"
+#include <algorithm>
 
-Engine::Engine() {
+Engine::Engine(Deck &deck) :
+  deck(deck)
+{
   text.load_font();
   screen.init();
   framebuffer.init();
@@ -13,9 +16,24 @@ void Engine::render() {
   glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
   glClear(GL_COLOR_BUFFER_BIT);
 
-  text.render(text_content, 25.0f, SCR_HEIGHT - text.font_size - 20, 1.0f,
-      glm::vec3(1.0f, 1.0f, 1.0f));
+  auto& slide = deck.slides.at(at_slide);
+  float line = 0;
+
+  for(auto& node : slide.content) {
+    if(node.type == NodeType::TEXT || node.type == NodeType::H1 || node.type == NodeType::UL) {
+      line++;
+      float y = (text.font_size + 20) * line;
+      text.render(node.content, 25.0f, SCR_HEIGHT - y, 1.0f,
+          glm::vec3(1.0f, 1.0f, 1.0f));
+    }
+  }
 
   framebuffer.commit();
   framebuffer.draw(screen);
 }
+
+void Engine::change_slide(int dir) {
+  if(deck.slides.size() == 0) at_slide = 0;
+
+  at_slide = std::clamp(at_slide + dir, 0, int(deck.slides.size() - 1));
+}
diff --git a/src/render.hpp b/src/render.hpp
index 7d95d16..cb38be3 100644
--- a/src/render.hpp
+++ b/src/render.hpp
@@ -2,14 +2,24 @@
 #include "screen.hpp"
 #include "framebuffer.hpp"
 #include "text.hpp"
+#include "document.hpp"
 
 struct Engine {
+  Deck& deck;
   FrameBuffer framebuffer;
   Screen screen;
-  std::string text_content{"Hi!"};
-  Text text{.font_size=202};
+  Text text{.font_size=100};
+  int at_slide = 0;
+  float mouse_x = 0.0f;
+  float mouse_y = 0.0f;
 
-  Engine();
+  Engine(Deck& deck);
 
   void render();
+  void change_slide(int dir);
+
+  void mouse(float x, float y) {
+    mouse_x = x;
+    mouse_y = y;
+  }
 };