feat: added FPS counter to terminal

CMakeLists.txt

@@ -4,8 +4,11 @@ project(64kDemo VERSION 0.1
 		DESCRIPTION "CPU SDF Renderer"
 		LANGUAGES CXX)
 
+set (CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
 SET(CMAKE_CXX_FLAGS "-Os -s")
 
+
 add_executable(one main.cpp)
 
 target_link_libraries(one m glfw GLEW GL)

PerformanceAnalyser.hpp

@@ -0,0 +1,40 @@
+#include <GL/glew.h>
+#include <cmath>
+#include <iostream>
+
+class PerformanceAnalyser {
+  private:
+    double lastFrameTime = 0;
+    int frameCount = 0;
+    double timeAcc = 0;
+    double lastFps = 0;
+
+  public:
+    PerformanceAnalyser(int framesToAcc = 10, bool autoPrint = true)
+        : framesToAcc(framesToAcc), autoPrint(autoPrint) {};
+
+    int framesToAcc;
+    bool autoPrint;
+
+    int getFPS() { return lastFps; }
+
+    void update(float time) {
+
+        timeAcc += (time - lastFrameTime);
+        lastFrameTime = time;
+        frameCount++;
+
+        if (frameCount == framesToAcc) {
+
+            lastFps = double(framesToAcc) / timeAcc;
+
+            if (autoPrint) {
+                std::cout << "Fps: " << std::round(lastFps * 10.0) * 0.1 << "\n"
+                          << std::flush;
+            }
+
+            frameCount = 0;
+            timeAcc = 0;
+        }
+    }
+};

main.cpp

@@ -1,7 +1,9 @@
 #include "FullScreenQuad.hpp"
+#include "PerformanceAnalyser.hpp"
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <cstdio>
+#include <iostream>
 
 const char *vertexShaderSource =
 #include "fsq.glsl"
@@ -75,6 +77,8 @@ void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
 }
 
 int main(int argc, char **argv) {
+    std::cout << "test";
+    std::cout << std::flush;
 
     GLFWwindow *window;
 
@@ -104,7 +108,15 @@ int main(int argc, char **argv) {
 
     FullScreenQuad fsq{};
 
+    PerformanceAnalyser perf{};
+
+    double time = glfwGetTime();
+
     while (!glfwWindowShouldClose(window)) {
+
+        time = glfwGetTime();
+        perf.update(time);
+
         processInput(window);
         /* Render here */
 
@@ -112,8 +124,12 @@ int main(int argc, char **argv) {
         glClear(GL_COLOR_BUFFER_BIT);
 
         glUseProgram(shaderProgram);
+
         int aspectLocation = glGetUniformLocation(shaderProgram, "aspect");
         glUniform1f(aspectLocation, aspect);
+        int timeLocation = glGetUniformLocation(shaderProgram, "t");
+        glUniform1f(timeLocation, 2. * time);
+
         glBindVertexArray(fsq.getVAO());
         glDrawArrays(GL_TRIANGLES, 0, 6);
 

sdf.glsl

@@ -5,6 +5,7 @@ out vec4 FragColor;
 in vec2 texCoords;
 
 uniform float aspect;
+uniform float t;
 
 vec3 center = vec3(0.0,-4.0,20.0);
 float radius = 5.0;
@@ -55,7 +56,7 @@ float planeMin(vec3 pos){
 }
 
 float sphereMin(vec3 pos){
-    return length(pos - center) - radius;
+    return length(pos - center) - radius + 0.2*sin(5*pos.x+t)*sin(5*pos.y+t)*sin(5*pos.z+t);
 }
 
 Ray minFn(Ray ray){