Add texture loading

shaders/shader.frag

@@ -1,8 +1,12 @@
 #version 330
 
 in vec4 vertex_color;
+in vec2 texture_coord;
+
 out vec4 color;
 
+uniform sampler2D tex;
+
 void main() {
-    color = vertex_color;
+    color = texture(tex, texture_coord);
 }

shaders/shader.vert

@@ -1,8 +1,10 @@
 #version 330
 
 layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 tex;
 
 out vec4 vertex_color;
+out vec2 texture_coord;
 
 uniform mat4 projection;
 uniform mat4 model;
@@ -11,4 +13,5 @@ uniform mat4 view;
 void main() {
     gl_Position = projection * view * model * vec4(pos, 1.0);
     vertex_color = vec4(clamp(pos, 0.0f, 1.0f), 1.0f);
+    texture_coord = tex;
 }

src/main.cpp

@@ -1,7 +1,10 @@
+#define STB_IMAGE_IMPLEMENTATION
+
 #include "mesh.h"
 #include "shader.h"
 #include "window.h"
 #include "camera.h"
+#include "texture.h"
 
 
 static const char *vertex_shader_code = "shaders/shader.vert";
@@ -21,10 +24,11 @@ int main() {
   {
     // Create a mesh
     f32 vertices[] = {
-      -1.0f, -1.0f, 0.0f,
-      0.0f, -1.0f, 1.0f,
-      1.0f,  -1.0f, 0.0f,
-      0.0f, 1.0f,  0.0f
+    // x      y      z     u     v
+      -1.0f, -1.0f,  0.0f, 0.0f, 0.0f,
+       0.0f, -1.0f,  1.0f, 1.0f, 0.0f,
+       1.0f, -1.0f,  0.0f, 1.0f, 0.0f,
+       0.0f,  1.0f,  0.0f, 0.0f, 1.0f
     };
 
     u32 indices[] = {
@@ -35,11 +39,11 @@ int main() {
     };
 
     Mesh *pyramid1 = new Mesh();
-    create_mesh(pyramid1, vertices, indices, 12, 12);
+    create_mesh(pyramid1, vertices, indices, 20, 12);
     meshes[0] = pyramid1;
 
     Mesh *pyramid2 = new Mesh();
-    create_mesh(pyramid2, vertices, indices, 12, 12);
+    create_mesh(pyramid2, vertices, indices, 20, 12);
     meshes[1] = pyramid2;
   }
 
@@ -50,12 +54,19 @@ int main() {
     shaders[0] = *shader;
   }
 
+  Texture clay_texture = Texture((char *)"assets/textures/clay_texture_1k.png");
+  load_texture(&clay_texture);
+
+  Texture plaster_texture = Texture((char *)"assets/textures/plaster_texture_1k.png");
+  load_texture(&plaster_texture);
+
   Matrix4 projection = glm::perspective(
-      45.0f, (GLfloat)window.buffer_width / (GLfloat)window.buffer_height, 0.1f,
+      45.0f, (f32)window.buffer_width / (f32)window.buffer_height, 0.1f,
       100.0f);
 
   Camera camera(Vector3(0.0f, 0.0f, 0.0f), Vector3(0.0f, 1.0f, 0.0f), 90.0f, 0.0f, 5.0f, 1.0f);
 
+
   // Loop until window is closed
   while (!glfwWindowShouldClose(window.gl_window)) {
     // Calculate delta
@@ -82,22 +93,22 @@ int main() {
     {
       Matrix4 model(1.0f);
       model = glm::translate(model, Vector3(0.0f, 0.0f, -2.5f));
-      // model = glm::rotate(model, current_angle * RADIAN_FACTOR, Vector3(0.0f, 1.0f, 0.0f));
       model = glm::scale(model, Vector3(0.4f, 0.4f, 1.0f));
 
       glUniformMatrix4fv(shaders[0].uniform_model, 1, GL_FALSE, glm::value_ptr(model));
       glUniformMatrix4fv(shaders[0].uniform_projection, 1, GL_FALSE, glm::value_ptr(projection));
+      use_texture(&clay_texture);
       render_mesh(meshes[0]);
     }
 
     {
       Matrix4 model(1.0f);
       model = glm::translate(model, Vector3(0.0f, 0.0f, -3.5f));
-      // model = glm::rotate(model, current_angle * RADIAN_FACTOR, Vector3(0.0f, 1.0f, 0.0f));
       model = glm::scale(model, Vector3(0.4f, 0.4f, 1.0f));
 
       glUniformMatrix4fv(shaders[0].uniform_model, 1, GL_FALSE, glm::value_ptr(model));
       glUniformMatrix4fv(shaders[0].uniform_projection, 1, GL_FALSE, glm::value_ptr(projection));
+      use_texture(&plaster_texture);
       render_mesh(meshes[1]);
     }
 

src/mesh.cpp

@@ -31,9 +31,14 @@ void create_mesh(
   glBindBuffer(GL_ARRAY_BUFFER, mesh->VBO);
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices[0]) * vertices_count, vertices, GL_STATIC_DRAW);
 
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
+  // Position vertices
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(vertices[0]) * 5, 0);
   glEnableVertexAttribArray(0);
 
+  // Texture coordinates
+  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(vertices[0]) * 5, (void *)(sizeof(vertices[0]) * 3));
+  glEnableVertexAttribArray(1);
+
   // Unbinding
   glBindBuffer(GL_ARRAY_BUFFER, 0);
   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

src/texture.cpp

@@ -0,0 +1,49 @@
+#include "texture.h"
+
+Texture::Texture(char *file_path) : file_path(file_path) {}
+
+Texture::~Texture() {
+  clear_texture(this);
+}
+
+bool load_texture(Texture *texture) {
+  u8 *texture_data = stbi_load(texture->file_path, &texture->width, &texture->height, &texture->bit_depth, 0);
+
+  if (!texture_data) {
+    printf("Failed to find: %s\n", texture->file_path);
+    return false;
+  }
+
+  glGenTextures(1, &texture->id);
+  glBindTexture(GL_TEXTURE_2D, texture->id);
+
+  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);
+
+  // Maybe just set to GL_RGB
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture->width, texture->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture_data);
+  glGenerateMipmap(GL_TEXTURE_2D);
+
+  glBindTexture(GL_TEXTURE_2D, 0);
+
+  stbi_image_free(texture_data);
+
+  return true;
+}
+
+void use_texture(Texture *texture) {
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, texture->id);  
+}
+
+void clear_texture(Texture *texture) {
+  glDeleteTextures(1, &texture->id);
+  texture->id = 0;
+  texture->width = 0;
+  texture->height = 0;
+  texture->bit_depth = 0;
+  texture->file_path = NULL;
+}
+

src/texture.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <GL/glew.h>
+#include "math.h"
+#include "../lib/stb_image.h"
+
+struct Texture {
+  u32 id = 0;
+  int width = 0;
+  int height = 0;
+  int bit_depth = 0;
+  char *file_path;
+
+  Texture(char *file_path);
+  ~Texture();
+};
+
+bool load_texture(Texture *texture);
+void use_texture(Texture *texture);
+void clear_texture(Texture *texture);