feat: set texture opacity randomly

.vscode/settings.json

@@ -104,6 +104,7 @@
     "Parameterfv",
     "Parameteri",
     "RENDERLOOP",
-    "VERTICE"
+    "VERTICE",
+    "vshader"
   ]
 }

Engine/engine/Shaders/fragmentShaderTextureUniform.fs

@@ -7,7 +7,7 @@ in vec2 TexCoord;
 // texture samplers
 uniform sampler2D texture1;
 uniform sampler2D texture2;
-uniform int mixProportions; // set in OGL code
+uniform float mixProportions; // set in OGL code
 
 void main()
 {

Engine/engine/draw.cpp

@@ -6,12 +6,15 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 
+#include <functional>
 #include <cmath>
 #include <filesystem>
 #include <iostream>
 #include <utility>
 #include <vector>
 #include <cstring>
+#include <stdlib.h>     /* srand, rand */
+#include <time.h>       /* time */
 
 #include "./constants.hpp"
 #include "./misc.hpp"
@@ -176,7 +179,7 @@ drawFigureReturn drawFigure(const int whatToDraw) {
           texture_constants::AWESOME_FACE_ARGUMENT
         };
         offsetsStruct offsets = offsetsStruct();
-        const std::vector<std::string> uniformInfo = {"ourColor"};
+        const std::vector<std::string> uniformInfo = {"mixProportions"};
         return draw(
         constants::VERTEX_SHADER_TEXTURE_FILENAME,
         constants::FRAGMENT_SHADER_TEXTURE_UNIFORM_FILENAME,
@@ -185,7 +188,7 @@ drawFigureReturn drawFigure(const int whatToDraw) {
         constants::TEXTURE_INDICES,
         constants::TEXTURE_INDICES_SIZE,
         true, true, textureInfoArray,
-        offsets);
+        offsets, uniformInfo);
     }
     default:
       throw "No function for this draw call";
@@ -237,7 +240,14 @@ drawFigureReturn draw(const char* vertexPath, const char* fragmentPath,
 
   configureVertexAttribute(colorIncluded, textureIncluded);
   if (uniformName.size() > 0) {
-    updateUniformColor(ourShader.ID, uniformName.at(0));
+    if(uniformName.at(0) == "ourColor") {
+      updateUniformColor(ourShader, uniformName.at(0));
+    }
+    if(uniformName.at(0) == "mixProportions") {
+      srand (time(NULL));
+      const float randomNumber = static_cast <float> (rand()) / static_cast <float> (RAND_MAX);
+      ourShader.setFloat(uniformName.at(0), randomNumber);
+    }
   }
 
   drawTextureArray(textureInfo, ourShader);
@@ -269,18 +279,15 @@ drawFigureReturn draw(const char* vertexPath, const char* fragmentPath,
   return newReturn;
 }
 
-void updateUniformColor(const unsigned int shaderProgram,
+void updateUniformColor(const Shader shaderProgram,
                         std::string uniformName) {
   // update the uniform color
   const float timeValue = glfwGetTime();  // retrieve running time
   const float greenValue = sin(timeValue) / 2.0f + 0.5f;
   // vary the color from 0.0 to 1.0 using sin
   // query the location of our uniform
-  const int vertexColorLocation =
+  shaderProgram.set4Float(uniformName, 0.0f, greenValue, 0.0f, 1.0f);
-      glGetUniformLocation(shaderProgram, uniformName.c_str());
   // if glGetUniformLocation returns -1 it could not find the location
-  if (vertexColorLocation != -1) {
-    glUniform4f(vertexColorLocation, 0.0f, greenValue, 0.0f, 1.0f);
     /* we set the uniform value using glUniform4f
     4f means that it expects 4 floats
     few of possible postfixes:
@@ -291,6 +298,5 @@ void updateUniformColor(const unsigned int shaderProgram,
         fv: the function expects a float vector/array as its value.
     */
   }
-}
 
 #endif  // #ifndef DRAW_CPP

Engine/engine/draw.hpp

@@ -27,7 +27,7 @@ struct drawFigureReturn {
 
 drawFigureReturn drawFigure(const int whatToDraw);
 
-void updateUniformColor(const unsigned int shaderProgram,
+void updateUniformColor(const Shader shaderProgram,
                         const std::string uniformName);
 
 drawFigureReturn draw(

Engine/engine/shader.cpp

@@ -78,6 +78,10 @@ void Shader::setFloat(const std::string &name, float value) const {
   glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
 }
 
+void Shader::set4Float(const std::string &name, const float floatOne, const float floatTwo, const float floatThree, const float floatFour) const {
+  glUniform4f(glGetUniformLocation(ID, name.c_str()), floatOne, floatTwo, floatThree, floatFour);
+}
+
 void Shader::checkCompileErrors(unsigned int shader, std::string type) {
   int success;
   char infoLog[1024];

Engine/engine/shader.hpp

@@ -27,6 +27,8 @@ class Shader {
   // ------------------------------------------------------------------------
   void setFloat(const std::string &name, float value) const;
 
+  void set4Float(const std::string &name, const float floatOne, const float floatTwo, const float floatThree, const float floatFour) const;
+
  private:
   // utility function for checking shader compilation/linking errors.
   // ------------------------------------------------------------------------