Can now load an image but it needs some work.

lua/builder_test.lua

@@ -7,6 +7,13 @@ config{
   font_color=rgba{255, 0, 0, 255},
 }
 
+slide{
+  h1 "Here's Mine",
+  image{
+    src="test.jpg"
+  }
+}
+
 slide{
   layout="no_title",
   font_size=200,
@@ -48,13 +55,6 @@ slide{
   ul "No need for phantom power.",
 }
 
-slide{
-  h1 "Here's Mine",
-  image{
-    src="p100101.jpg"
-  }
-}
-
 slide{
   layout="no_title",
   font_size=150,

meson.build

@@ -40,6 +40,7 @@ sources = [
   'src/framebuffer.cpp',
   'src/screen.cpp',
   'src/render.cpp',
+  'src/image.cpp',
 ]
 
 tests = [

shaders/image.frag.glsl

@@ -0,0 +1,12 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoord;
+
+// texture sampler
+uniform sampler2D texture1;
+
+void main()
+{
+	FragColor = texture(texture1, TexCoord);
+}

shaders/image.vert.glsl

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec2 aTexCoord;
+
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = vec4(aPos, 1.0);
+	TexCoord = aTexCoord;
+}

src/image.cpp

@@ -0,0 +1,83 @@
+#include "image.hpp"
+#include <stb_image.h>
+
+unsigned int image_to_texture(unsigned char *data, int width, int height, int nrComponents) {
+  unsigned int textureID;
+  glGenTextures(1, &textureID);
+
+  GLenum format = GL_RGB;
+
+  switch(nrComponents) {
+    case 1:
+      format = GL_RED;
+      break;
+    case 3:
+      format = GL_RGB;
+      break;
+    case 4:
+      format = GL_RGBA;
+      break;
+    default:
+      dbc::sentinel($F("Impossible nrComponents={} when loading image", nrComponents));
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textureID);
+  glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  return textureID;
+}
+
+void Image::load(Node& node) {
+  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);
+
+    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"));
+
+  shader.use();
+  shader.setInt("texture1", texture_id);
+  glBindVertexArray(image_vao);
+  glBindTexture(GL_TEXTURE_2D, texture_id);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+}
+
+Image::Image() {
+  glGenVertexArrays(1, &image_vao);
+  glGenBuffers(1, &image_vbo);
+
+  glBindVertexArray(image_vao);
+  glBindBuffer(GL_ARRAY_BUFFER, image_vbo);
+  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices, GL_STATIC_DRAW);
+
+  // position attrib
+  glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
+  glEnableVertexAttribArray(0);
+
+  // color attribute
+  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
+  glEnableVertexAttribArray(1);
+}

src/image.hpp

@@ -0,0 +1,25 @@
+#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;
+
+  float vertices[24] = {
+    // positions   // texCoords
+    -0.5f,  0.5f,  0.0f, 1.0f, // top left
+    -0.5f, -0.5f,  0.0f, 0.0f, // bottom left
+    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 render(Node& node, float xpos, float ypos, float w, float h);
+};

src/render.cpp

@@ -1,6 +1,11 @@
 #include "render.hpp"
 #include "config.hpp"
 #include <algorithm>
+#include "dbc.hpp"
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include "image.hpp"
 
 Engine::Engine(Deck &deck) :
   deck(deck)
@@ -20,11 +25,18 @@ void Engine::render() {
   float line = 0;
 
   for(auto& node : slide.content) {
+    line++;
+    float y = (text.font_size + 20) * line;
+
     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));
+      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;
+      img.load(node);
+      img.render(node, -1.0f, -1.0f, 1.0f, 1.0f);
+      // it's an image, skip it
+    } else {
+      dbc::sentinel("Unknown NodeType");
     }
   }
 

src/screen.cpp

@@ -11,8 +11,10 @@ void Screen::init() {
   glBindVertexArray(target_VAO);
   glBindBuffer(GL_ARRAY_BUFFER, target_VBO);
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), &vertices, GL_STATIC_DRAW);
-  glEnableVertexAttribArray(0);
+
   glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void *)0);
-  glEnableVertexAttribArray(1);
+  glEnableVertexAttribArray(0);
+
   glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
+  glEnableVertexAttribArray(1);
 }