Textures and colors passed to shader via Uniforms

CMakeLists.txt

@@ -37,7 +37,10 @@ swig_add_library(couchlua
 target_link_libraries(couchlua ${LUA_LIBRARIES})
 target_link_libraries(couch couchlua)
 
+add_subdirectory(thirdparty)
+
 if(WIN32)
   target_link_libraries(couch glfw3dll)
+  target_link_libraries(couch ssp)
   set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
 endif(WIN32)

core/Ball.cpp

@@ -3,15 +3,15 @@
 Ball::Ball() {
   // It's a cube really
   // Front
-  vertices.push_back(Vertex(1.0f, 1.0f, 1.0f));
-  vertices.push_back(Vertex(1.0f, -1.0f, 1.0f));
-  vertices.push_back(Vertex(-1.0f, 1.0f, 1.0f));
-  vertices.push_back(Vertex(-1.0f, -1.0f, 1.0f));
+  vertices.push_back(Vertex(1.0f, 1.0f, 1.0f, 0.0f, 1.0f));
+  vertices.push_back(Vertex(1.0f, -1.0f, 1.0f, 0.0f, 0.0f));
+  vertices.push_back(Vertex(-1.0f, 1.0f, 1.0f, 1.0f, 1.0f));
+  vertices.push_back(Vertex(-1.0f, -1.0f, 1.0f, 1.0f, 0.0f));
   // Back
-  vertices.push_back(Vertex(1.0f, 1.0f, -1.0f));
-  vertices.push_back(Vertex(1.0f, -1.0f, -1.0f));
-  vertices.push_back(Vertex(-1.0f, 1.0f, -1.0f));
-  vertices.push_back(Vertex(-1.0f, -1.0f, -1.0f));
+  vertices.push_back(Vertex(1.0f, 1.0f, -1.0f, 0.0f, 0.0f));
+  vertices.push_back(Vertex(1.0f, -1.0f, -1.0f, 0.0f, 1.0f));
+  vertices.push_back(Vertex(-1.0f, 1.0f, -1.0f, 1.0f, 0.0f));
+  vertices.push_back(Vertex(-1.0f, -1.0f, -1.0f, 1.0f, 1.0f));
 
   //Front
   indices.push_back(Index(0, 1, 2));

core/Drawable.h

@@ -2,11 +2,13 @@
 #define DRAWABLE_H
 
 #include "Node.h"
+#include "Material.h"
 
 class Drawable : virtual public Node {
 public:
   virtual bool IsDrawable() const {return true;}
   virtual void Draw() = 0;
+  Material *material;
 };
 
 #endif /* DRAWABLE_H */

core/Material.cpp

@@ -0,0 +1,47 @@
+#include "Material.h"
+
+Color::Color() {
+  this->r = 0.0f;
+  this->g = 0.0f;
+  this->b = 0.0f;
+}
+
+Color::Color(cfloat r, cfloat g, cfloat b) {
+  this->r = r;
+  this->g = g;
+  this->b = b;
+}
+
+Texture::Texture() {}
+
+Texture Texture::FromFile(const char *filename) {
+  // Lotta hocus pocus
+  // https://learnopengl.com/Getting-started/Textures
+  Texture tex;
+  glGenTextures(1, &tex.id);
+  glBindTexture(GL_TEXTURE_2D, tex.id);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+  int nrChannels;
+  unsigned char* data = stbi_load(filename, &tex.width, &tex.height, &nrChannels, 0);
+  if (data) {
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex.width, tex.height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+  } else {
+    std::cout << "Error loading texture file: " << filename << std::endl;
+    exit(1);
+  }
+
+  stbi_image_free(data);
+
+  return tex;
+}
+
+Material::Material() {
+  usesColor = false;
+  usesTex = false;
+}

core/Material.h

@@ -0,0 +1,34 @@
+#ifndef MATERIAL_H
+#define MATERIAL_H
+
+#include <iostream>
+#include <stdlib.h>
+
+#include <GL/glew.h>
+#include "stb_image.h"
+
+#include "types.h"
+
+struct Color {
+  cfloat r, g, b;
+  Color();
+  Color(cfloat r, cfloat g, cfloat b);
+};
+
+class Texture {
+public:
+  int width, height;
+  Id id;
+  static Texture FromFile(const char *filename);
+  Texture();
+};
+
+struct Material {
+  Color color;
+  bool usesColor;
+  Texture tex;
+  bool usesTex;
+  Material();
+};
+
+#endif /* MATERIAL_H */

core/Mesh.cpp

@@ -1,6 +1,12 @@
 #include "Mesh.h"
 
-Mesh::Mesh() {}
+Mesh::Mesh() {
+  material = new Material();
+}
+
+Mesh::~Mesh() {
+  delete material;
+}
 
 Mesh::Mesh(VertexList vertices, IndexList indices) {
   this->vertices = vertices;
@@ -24,7 +30,10 @@ void Mesh::SetupMesh() {
   // Vertex positions
   glEnableVertexAttribArray(0);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*) 0);
-  // TODO normals, uv
+  // Vertex UV
+  glEnableVertexAttribArray(1);
+  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(3 * sizeof(float)));
+  // TODO normals
 
   glBindVertexArray(0);
 }

core/Mesh.h

@@ -14,6 +14,7 @@ public:
   VertexList vertices;
   IndexList indices;
   Mesh();
+  ~Mesh();
   Mesh(VertexList vertices, IndexList indices);
   virtual void Draw();
   virtual void SetupMesh();

core/Shader.cpp

@@ -67,8 +67,6 @@ Shader::Shader(const char* vertexPath, const char* fragmentPath) {
   glDeleteShader(fragment);
 }
 
-
-
 void Shader::Use() {
   glUseProgram(id);
 }
@@ -85,6 +83,23 @@ void Shader::UpdateProjection(Matrix projection) {
   glUniformMatrix4fv(glGetUniformLocation(id, "PROJECTION"), 1, GL_FALSE, glm::value_ptr(projection));
 }
 
+void Shader::UpdateColor(bool usesColor) {
+  glUniform1i(glGetUniformLocation(id, "material.usesColor"), (int) usesColor);
+}
+
+void Shader::UpdateColor(bool usesColor, Color color) {
+  glUniform1i(glGetUniformLocation(id, "material.usesColor"), (int) usesColor);
+  glUniform3f(glGetUniformLocation(id, "material.color"), color.r, color.g, color.b);
+}
+
+void Shader::UpdateTex(bool usesTex) {
+  glUniform1i(glGetUniformLocation(id, "material.usesTex"), (int) usesTex);
+}
+void Shader::UpdateTex(bool usesTex, Texture tex) {
+  glUniform1i(glGetUniformLocation(id, "material.usesTex"), (int) usesTex);
+  glBindTexture(GL_TEXTURE_2D, tex.id);
+}
+
 Name Shader::GetName() const {
   return "Unnamed Shader";
 }

core/Shader.h

@@ -9,6 +9,7 @@
 #include <glm/gtc/type_ptr.hpp>
 
 #include "types.h"
+#include "Material.h"
 
 class Shader {
 public:
@@ -19,6 +20,10 @@ public:
   void UpdateView(Matrix view);
   void UpdateModel(Matrix model);
   void UpdateProjection(Matrix projection);
+  void UpdateColor(bool usesColor);
+  void UpdateColor(bool usesColor, Color color);
+  void UpdateTex(bool usesTex);
+  void UpdateTex(bool usesTex, Texture tex);
 
   virtual Name GetName() const;
 };

core/Vertex.cpp

@@ -4,10 +4,22 @@ Vertex::Vertex() {
   x = 0.0f;
   y = 0.0f;
   z = 0.0f;
+  u = 0.0f;
+  v = 0.0f;
 }
 
 Vertex::Vertex(cfloat x, cfloat y, cfloat z) {
   this->x = x;
   this->y = y;
   this->z = z;
+  this->u = 0.0f;
+  this->v = 0.0f;
+}
+
+Vertex::Vertex(cfloat x, cfloat y, cfloat z, cfloat u, cfloat v) {
+  this->x = x;
+  this->y = y;
+  this->z = z;
+  this->u = u;
+  this->v = v;
 }

core/Vertex.h

@@ -8,7 +8,9 @@
 struct Vertex {
   Vertex();
   Vertex(cfloat x, cfloat y, cfloat z);
+  Vertex(cfloat x, cfloat y, cfloat z, cfloat u, cfloat v);
   cfloat x, y, z;
+  cfloat u, v;
 };
 
 typedef std::vector<Vertex> VertexList;

core/couch.cpp

@@ -15,6 +15,10 @@
 #include "Node.h"
 #include "Lua.h"
 
+// Thirdparty Includes
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
 Window *window;
 
 const int width = 800;
@@ -33,6 +37,16 @@ void render(Node *curr, Shader *shader, Matrix model) {
       shader->UpdateModel(model);
     }
     Drawable *drawable = dynamic_cast<Drawable*>(curr);
+    if (drawable->material->usesColor) {
+      shader->UpdateColor(true, drawable->material->color);
+    } else {
+      shader->UpdateColor(false);
+    }
+    if (drawable->material->usesTex) {
+      shader->UpdateTex(true, drawable->material->tex);
+    } else {
+      shader->UpdateTex(false);
+    }
     drawable->Draw();
   }
   for (Node *child : curr->children) {
@@ -66,6 +80,7 @@ int main() {
   }
 
   glViewport(0, 0, width, height);
+  glEnable(GL_DEPTH_TEST);
 
   root = Node::GetRoot();
 
@@ -76,7 +91,6 @@ int main() {
   
   FlatShader *shader = new FlatShader();
   shader->Use();
-  shader->UpdateColor(Vector3(0.0f, 1.0f, 0.0f));
   
   Matrix projection = glm::perspective(glm::radians(45.0f), 800.0f/600.0f, 0.1f, 100.0f);
   shader->UpdateProjection(projection);
@@ -90,7 +104,7 @@ int main() {
 
   while(!glfwWindowShouldClose(window)) {
     glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     lua->Update(delta);
 

main.lua

@@ -20,15 +20,23 @@ local cam_rot_y = 0.0
 
 local SPEED = 30
 
+local RED = couch.Color(1.0, 0.0, 0.0)
+local BLUE = couch.Color(0.0, 0.0, 1.0)
+
 function init()
    camera = couch.Camera()
    camera:MakeCurrent()
    camera.transform:Translate(0.0, 0.0, 10.0)
    ball = couch.Ball()
    ball:SetupMesh()
+   ball.material.color = RED
+   ball.material.usesColor = true
    couch.Node.GetRoot().children:Append(ball)
    ball1 = couch.Ball()
    ball1:SetupMesh()
+   ball1.material.tex = couch.Texture.FromFile("container.png")
+   ball1.material.usesTex = true
+   print(ball1.material.tex.width, ball1.material.tex.height)
    couch.Node.GetRoot().children:Append(ball1)
 
    ball1.transform:Translate(0.0, 3.0, 0.0)

scripting/couch.i

@@ -8,6 +8,7 @@
 #include "Transform.h"
 #include "Spatial.h"
 #include "Drawable.h"
+#include "Material.h"
 #include "Mesh.h"
 #include "Ball.h"
 #include "Camera.h"
@@ -36,6 +37,7 @@ public:
 %include "Spatial.h"
 %include "Transform.h"
 %include "Drawable.h"
+%include "Material.h"
 %include "Mesh.h"
 %include "Ball.h"
 %include "Camera.h"

shaders/flat.frag

@@ -1,9 +1,24 @@
 #version 330 core
 
-uniform vec3 color;
+in vec2 UV;
 
 out vec4 FragColor;
 
+struct Material {
+  vec3 color;
+  bool usesColor;
+  sampler2D tex;
+  bool usesTex;
+};
+
+uniform Material material;
+
 void main() {
-  FragColor = vec4(color, 1.0);  
+  FragColor = vec4(0.0);
+  if (material.usesColor) {
+    FragColor += vec4(material.color, 1.0);
+  }
+  if (material.usesTex) {
+    FragColor += texture(material.tex, UV);
+  }
 }

shaders/flat.vert

@@ -1,11 +1,15 @@
 #version 330 core
 
 layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 uv;
 
 uniform mat4 MODEL;
 uniform mat4 VIEW;
 uniform mat4 PROJECTION;
 
+out vec2 UV;
+
 void main() {
   gl_Position = PROJECTION * VIEW * MODEL * vec4(pos, 1.0);
+  UV = uv;
 }

thirdparty/CMakeLists.txt

@@ -0,0 +1,7 @@
+project(Couch)
+
+target_include_directories(couch
+  PUBLIC stb)
+
+target_include_directories(couchlua
+  PUBLIC stb)

thirdparty/stb/.#CMakeLists.txt

@@ -0,0 +1 @@
+dane@sweetdee.1314:1610908086

thirdparty/stb/CMakeLists.txt

@@ -0,0 +1 @@
+Project(stb)