Everything required for a mouse driven look is in the program just troubleshooting now

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.21 FATAL_ERROR)
 
 project(Game)
+set(CMAKE_CXX_STANDARD 17)
 
 file(GLOB_RECURSE SOURCE_FILES
     ${CMAKE_SOURCE_DIR}/src/*.c

data/shaders/fragment.glsl

@@ -1,4 +1,4 @@
-#version 330 core
+#version 430 core
 out vec4 FragColor;
 
 in vec2 ourTexCoord;

data/shaders/vertex.glsl

@@ -1,11 +1,14 @@
-#version 330 core
+#version 430 core
 layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec2 aTexCoord;
 
+// View
+layout (location = 2) uniform mat4 mvp;
+
 out vec2 ourTexCoord;
 
 void main()
 {
-   gl_Position = vec4(aPos, 1.0);
+   gl_Position = mvp * vec4(aPos, 1.0);
    ourTexCoord = aTexCoord;
 };

src/Error.cpp

@@ -14,5 +14,6 @@ void Error::warn(std::string msg) {
   // throw object + ": " + msg;
 }
 void Error::log(std::string msg) {
-  std::cout << object << ": \n" << msg << std::endl;
+  std::cout << object << std::endl;
+  std::cout << msg << std::endl;
 }

src/PlayerCamera.cpp

@@ -1,12 +1,41 @@
 #include "PlayerCamera.h"
 
 PlayerCamera::PlayerCamera() {
+  this->error = new Error("PlayerCamera");
   SDL_SetRelativeMouseMode(SDL_TRUE);
   SDL_GetRelativeMouseState(nullptr, nullptr);
 }
 
-PlayerCamera::~PlayerCamera() {}
+PlayerCamera::~PlayerCamera() { delete this->error; }
 
-void PlayerCamera::tick() {}
+void PlayerCamera::tick() {
+  SDL_GetRelativeMouseState(&mouseX, &mouseY);
 
-glm::mat4 PlayerCamera::getMVP() {}
+  // adjust rotation based off mouse input
+  pos.yaw -= mouseX * mouseSensitivity;
+  pos.pitch -= mouseY * mouseSensitivity;
+  if (pos.pitch > maxPitch)
+    pos.pitch = maxPitch;
+  if (pos.pitch < -maxPitch)
+    pos.pitch = -maxPitch;
+
+  // Get player forward vector and rotation matrix
+  glm::vec4 playerForward;
+  glm::mat4 playerRotation;
+
+  playerRotation = glm::rotate(playerRotation, pos.yaw, glm::vec3(0, 1, 0));
+  playerRotation = glm::rotate(playerRotation, pos.pitch, glm::vec3(1, 0, 0));
+  playerForward = glm::vec4(0, 0, -1, 0) * playerRotation;
+
+  // move camera
+  glm::mat4 view =
+      glm::lookAt(glm::vec3(pos.location),
+                  glm::vec3(pos.location + playerForward), glm::vec3(0, 1, 0));
+  glm::mat4 projection =
+      glm::perspective(glm::radians(45.0f), 1.0f, 0.1f, 1000.0f);
+  glm::mat4 transform;
+
+  MVP = projection * view * transform;
+}
+
+glm::mat4 PlayerCamera::getMVP() { return MVP; }

src/PlayerCamera.h

@@ -1,8 +1,9 @@
 #pragma once
+#include "Error.h"
 #include <SDL2/SDL_mouse.h>
 #include <SDL2/SDL_stdinc.h>
+#include <glm/ext.hpp>
 #include <glm/glm.hpp>
-#include <iostream>
 #include <string>
 
 class PlayerCamera {
@@ -10,13 +11,14 @@ private:
   // Constants for speed and sensitivity
   const float movementSpeed = 0.05f;
   const float mouseSensitivity = 0.05f;
+  const float maxPitch = glm::radians(89.0f);
 
   // Player position
-  struct position {
+  struct CameraPosition {
     glm::vec4 location;
     float pitch;
     float yaw;
-  };
+  } pos;
 
   // Mouse position
   int mouseX, mouseY;
@@ -24,6 +26,9 @@ private:
   // Camera position
   glm::mat4 MVP;
 
+  // Error
+  Error *error = nullptr;
+
 public:
   PlayerCamera();
 

src/ShaderLoader.cpp

@@ -88,3 +88,4 @@ void ShaderLoader::setInt(const std::string &name, int value) const {
 void ShaderLoader::setFloat(const std::string &name, float value) const {
   glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
 }
+unsigned int ShaderLoader::getShaderProgramID() { return ID; }

src/ShaderLoader.h

@@ -21,6 +21,9 @@ public:
   // use the shader
   void use();
 
+  // Get shader id until I figure out uniforms
+  unsigned int getShaderProgramID();
+
   // utility uniform functions
   void setBool(const std::string &name, bool value) const;
   void setInt(const std::string &name, int value) const;

src/main.cpp

@@ -11,10 +11,13 @@
 //#include <glm/glm.hpp>
 // File reader
 #include <fstream>
-#include <iostream>
 #include <string>
 // Shader
 #include "ShaderLoader.h"
+#include <iostream>
+
+// Camera postioning
+#include "PlayerCamera.h"
 
 // Include error class
 #include "Error.h"
@@ -53,31 +56,34 @@ int main(int argc, char **argv) {
   // TODO: Test that glContext was created successfully
 
   // Tell us the number of vertex attributes allowed in bug reports
-  //
   int nrAttributes;
   glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &nrAttributes);
   error.log("Maximum num of vertex attributes supported: " +
             std::to_string(nrAttributes));
 
   // Initialise Glew
-  if (glewInit() != GLEW_OK) {
+  GLenum glewStatus = glewInit();
+  if (glewStatus != GLEW_OK) {
+    // TODO make this work. I mean ffs if glew brakes how will I debug it.
+    // auto errorMsg = glewGetErrorString(glewStatus);
+    // error.log(errorMsg);
     error.crash("Unable to initialise GLEW (OpenGL Extention Wrangler)");
   }
 
   // Create event handling struct
   SDL_Event input;
 
-  ShaderLoader shader("../data/shaders"
+  ShaderLoader shader("./data/shaders"
                       "/vertex.glsl",
-                      "../data/shaders"
+                      "./data/shaders"
                       "/fragment.glsl");
 
   float vertices[] = {
       // positions        // texture Co-ords
-      0.5f,  0.5f,  0.0f, 1.0f, 1.0f, // top right
-      0.5f,  -0.5f, 0.0f, 1.0f, 0.0f, // bottom right
-      -0.5f, -0.5f, 0.0f, 0.0f, 0.0f, // bottom left
-      -0.5f, 0.5f,  0.0f, 0.0f, 1.0f  // top left
+      0.5f,  0.5f,  1.0f, 1.0f, 1.0f, // top right
+      0.5f,  -0.5f, 1.0f, 1.0f, 0.0f, // bottom right
+      -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, // bottom left
+      -0.5f, 0.5f,  1.0f, 0.0f, 1.0f  // top left
   };
 
   unsigned int indices[] = {
@@ -125,7 +131,7 @@ int main(int argc, char **argv) {
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
   // Load texture image
-  SDL_Surface *image = IMG_Load("../data"
+  SDL_Surface *image = IMG_Load("./data"
                                 "/container.jpg");
   if (image == nullptr) {
     error.crash("SDL2_image was unable to load a texture", IMG_GetError());
@@ -151,6 +157,11 @@ int main(int argc, char **argv) {
   SDL_FreeSurface(image);
   image = nullptr;
 
+  // Finally create camera object
+  PlayerCamera camera;
+
+  GLuint mvpLocation = glGetUniformLocation(shader.getShaderProgramID(), "mvp");
+
   // Game loop
   bool running = true;
   while (running) {
@@ -162,12 +173,18 @@ int main(int argc, char **argv) {
       }
       // TODO: Do something with keys lol
     };
-    // Clear screen ready for next loop
+    // Perform game logic
+    camera.tick();
+
+    // Clear screen ready for this loop
     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     // Make every shader/rendering call from this point on use our shader
     // glUseProgram(shaderProgram);
 
+    glUniformMatrix4fv(mvpLocation, 1, GL_FALSE,
+                       glm::value_ptr(camera.getMVP()));
+    // use our shader
     shader.use();
 
     // I think this is meant to be here but it breaks...