Images are better organized but still need to be setup before rendering.

lua/builder_test.lua

@@ -10,7 +10,7 @@ config{
 slide{
   h1 "Here's Mine",
   image{
-    src="test.jpg"
+    src="assets/test.jpg"
   }
 }
 

src/document.hpp

@@ -4,6 +4,8 @@
 #include <vector>
 #include <unordered_map>
 #include <cstdint>
+#include <memory>
+#include "image.hpp"
 
 enum class NodeType {
   TEXT,
@@ -28,6 +30,7 @@ struct Node {
   NodeType type = NodeType::ERROR;
   std::string content = "";
   std::unordered_map<std::string, std::any> config{};
+  std::shared_ptr<Image> image = nullptr;
 };
 
 struct Slide {

src/image.cpp

@@ -1,6 +1,18 @@
 #include "image.hpp"
 #include <stb_image.h>
 
+// these never change so just put them here
+float VERTICES[24] = {
+  // positions   // texCoords
+  -1.0f,  1.0f,  0.0f, 1.0f, // top left
+  -1.0f, -1.0f,  0.0f, 0.0f, // bottom left
+  1.0f, -1.0f,   1.0f, 0.0f, // bottom right
+
+  -1.0f,  1.0f,  0.0f, 1.0f, // top left
+  1.0f, -1.0f,   1.0f, 0.0f, // bottom right
+  1.0f,  1.0f,   1.0f, 1.0f, // top right
+};
+
 unsigned int image_to_texture(unsigned char *data, int width, int height, int nrComponents) {
   unsigned int textureID;
   glGenTextures(1, &textureID);
@@ -31,33 +43,17 @@ unsigned int image_to_texture(unsigned char *data, int width, int height, int nr
   return textureID;
 }
 
-void Image::load(Node& node) {
+void Image::load(const std::string& filename) {
-  dbc::check(node.type == NodeType::IMAGE, "That's not an image idiot.");
-
-  if(!node.config.contains("_image_data")) {
-    dbc::check(node.config.contains("src"), "Node doesn't have an image src.");
-    std::string filename = std::any_cast<std::string>(node.config.at("src"));
-
-    int width = 0;
-    int height = 0;
-    int nrComponents = 0;
   stbi_set_flip_vertically_on_load(true);
   unsigned char *data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
   dbc::check(data != NULL, "Failed to stb_load image.");
 
-    unsigned int texture_id = image_to_texture(data, width, height, nrComponents);
+  texture_id = image_to_texture(data, width, height, nrComponents);
-
-    node.config.try_emplace("_image_data", texture_id);
 
   stbi_image_free(data);
 }
-}
-
-void Image::render(Node& node, float xpos, float ypos, float w, float h) {
-  dbc::check(node.config.contains("_image_data"), "Node isn't configured for images, did you Image::load?");
-
-  unsigned int texture_id = std::any_cast<unsigned int>(node.config.at("_image_data"));
 
+void Image::render() {
   shader.use();
   shader.setInt("texture1", texture_id);
   glBindVertexArray(image_vao);
@@ -71,7 +67,7 @@ Image::Image() {
 
   glBindVertexArray(image_vao);
   glBindBuffer(GL_ARRAY_BUFFER, image_vbo);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices, GL_STATIC_DRAW);
+  glBufferData(GL_ARRAY_BUFFER, sizeof(VERTICES), &VERTICES, GL_STATIC_DRAW);
 
   // position attrib
   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);

src/image.hpp

@@ -1,25 +1,18 @@
 #pragma once
 
-#include "document.hpp"
 #include "shader.hpp"
 
 struct Image {
   Shader shader{{"shaders/image.vert.glsl", "shaders/image.frag.glsl", ""}};
   unsigned int image_vao = UINT_MAX;
   unsigned int image_vbo = UINT_MAX;
-
+  unsigned int texture_id = UINT_MAX;
-  float vertices[24] = {
+  int width = 0;
-    // positions   // texCoords
+  int height = 0;
-    -0.5f,  0.5f,  0.0f, 1.0f, // top left
+  int nrComponents = 0;
-    -0.5f, -0.5f,  0.0f, 0.0f, // bottom left
+  // scale, rotate, position
-    0.5f, -0.5f,   1.0f, 0.0f, // bottom right
-
-    -0.5f,  0.5f,  0.0f, 1.0f, // top left
-    0.5f, -0.5f,   1.0f, 0.0f, // bottom right
-    0.5f,  0.5f,   1.0f, 1.0f, // top right
-  };
 
   Image();
-  void load(Node& node);
+  void load(const std::string& filename);
-  void render(Node& node, float xpos, float ypos, float w, float h);
+  void render();
 };

src/render.cpp

@@ -31,10 +31,13 @@ void Engine::render() {
     if(node.type == NodeType::TEXT || node.type == NodeType::H1 || node.type == NodeType::UL) {
       text.render(node.content, 25.0f, SCR_HEIGHT - y, 1.0f, glm::vec3(1.0f, 1.0f, 1.0f));
     } else if(node.type == NodeType::IMAGE) {
-      Image img;
+      if(node.image == nullptr) {
-      img.load(node);
+        node.image = std::make_shared<Image>();
-      img.render(node, -1.0f, -1.0f, 1.0f, 1.0f);
+        std::string src = std::any_cast<std::string>(node.config.at("src"));
-      // it's an image, skip it
+        node.image->load(src);
+      }
+
+      node.image->render();
     } else {
       dbc::sentinel("Unknown NodeType");
     }