Implement Phong Light Shading + Optimizations

Lighting/fragShader.glsl

@@ -1,8 +1,42 @@
 #version 430
 layout (binding=0) uniform sampler2D samp;
 in vec2 uv;
+in vec3 varyingNormal;
+in vec3 varyingLightDir;
+in vec3 varyingVertPos;
+in vec3 varyingHalfVector;
 out vec4 color;
+
+struct PositionalLight
+{  vec4 ambient;
+   vec4 diffuse;
+   vec4 specular;
+   vec3 position;
+};
+struct Material
+{  vec4 ambient;
+   vec4 diffuse;
+   vec4 specular;
+   float shininess;
+};
+uniform vec4 globalAmbient;
+uniform PositionalLight light;
+uniform Material material;
+
 void main(void)
 {
-	color=texture(samp,uv);
+    vec3 Normal=normalize(varyingNormal);
+    vec3 Light=normalize(varyingLightDir);
+
+    vec3 ViewVec=normalize(-varyingVertPos);
+    vec3 H=normalize(varyingHalfVector);
+
+    float cosTheta=dot(Light,Normal);
+    float cosPhi=dot(Normal,H);
+
+    vec3 ambient=((globalAmbient * material.ambient) + (light.ambient * material.ambient)).xyz;
+    vec3 diffuse=light.diffuse.xyz * material.diffuse.xyz * max(cosTheta, 0.0);
+    vec3 specular=material.specular.xyz * light.specular.xyz * pow(max(cosPhi, 0.0f), material.shininess*3.0);
+
+	color=vec4(ambient+diffuse+specular,material.diffuse.w);
 }

Lighting/main.cpp

@@ -20,16 +20,36 @@ GLuint vao[numVAOs];
 GLuint vbo[numVBOs];
 
 glm::vec3 camera;
-GLuint mvLoc,projLoc;
+GLuint globalAmbLoc,ambLoc,diffLoc,specLoc,lPosLoc,mAmbLoc,mDiffLoc,mSpecLoc,mShinLoc,mvLoc,projLoc,nLoc;
 int width, height;
 float aspect;
-glm::mat4 mMat, pMat, vMat, mvMat;
+glm::mat4 mMat, pMat, vMat, mvMat,invTrMat;
+glm::vec3 currentLightPos,lightPosV;
+std::array<float,3>lightPos;
+glm::vec3 initialLightLoc={0.0f,2.0f,4.0f};
+
+float globalAmbient[4] = { 0.7f, 0.7f, 0.7f, 1.0f };
+float lightAmbient[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
+float lightDiffuse[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
+float lightSpecular[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
+
+float* matAmb = utils::silverAmbient();
+float* matDif = utils::silverDiffuse();
+float* matSpe = utils::silverSpecular();
+float matShi = utils::silverShininess();
+
+float* matAmb2 = utils::jadeAmbient();
+float* matDif2 = utils::jadeDiffuse();
+float* matSpe2 = utils::jadeSpecular();
+float matShi2 = utils::jadeShininess();
+
+
 std::stack<glm::mat4>transforms;
 
 GLuint pyrTex;
 
 Sphere sphere(48);
-Torus torus(1.9,0.4,48);
+Torus torus(1.0,0.5,48);
 ImportedModel shuttle("shuttle.obj");
 
 void setupVertices(void) {
@@ -117,13 +137,13 @@ void setupVertices(void) {
         nvalues.push_back(normals[i].z);
     }
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[7]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[8]);
     glBufferData(GL_ARRAY_BUFFER, pvalues.size()*sizeof(float), pvalues.data(), GL_STATIC_DRAW);
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[8]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[9]);
     glBufferData(GL_ARRAY_BUFFER, tvalues.size()*sizeof(float), tvalues.data(),GL_STATIC_DRAW);
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[9]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[10]);
     glBufferData(GL_ARRAY_BUFFER, nvalues.size()*sizeof(float), nvalues.data(), GL_STATIC_DRAW);
 }
 
@@ -139,7 +159,7 @@ void setupTextures(){
 
 void init(GLFWwindow* window) {
     renderingProgram=utils::createShaderProgram("vertShader.glsl","fragShader.glsl");
-    camera={0.0f,5.0f,-10.0f};
+    camera={0.0f,0.0f,-10.0f};
     setupVertices();
     setupTextures();
 }
@@ -147,6 +167,7 @@ void init(GLFWwindow* window) {
 void DrawSphere(){
     glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat));
     glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
+    glUniformMatrix4fv(nLoc, 1, GL_FALSE, glm::value_ptr(invTrMat));
     glBindBuffer(GL_ARRAY_BUFFER,vbo[0]);
     glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[1]);
@@ -161,6 +182,7 @@ void DrawSphere(){
 void DrawTorus(){
     glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat));
     glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
+    glUniformMatrix4fv(nLoc, 1, GL_FALSE, glm::value_ptr(invTrMat));
     glBindBuffer(GL_ARRAY_BUFFER,vbo[4]);
     glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[5]);
@@ -175,16 +197,48 @@ void DrawTorus(){
 void DrawShuttle(){
     glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat));
     glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
-    glBindBuffer(GL_ARRAY_BUFFER,vbo[7]);
+    glUniformMatrix4fv(nLoc, 1, GL_FALSE, glm::value_ptr(invTrMat));
-    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[8]);
-    glVertexAttribPointer(1,2,GL_FLOAT,GL_FALSE,0,0);
+    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[9]);
+    glVertexAttribPointer(1,2,GL_FLOAT,GL_FALSE,0,0);
+    glBindBuffer(GL_ARRAY_BUFFER,vbo[10]);
     glVertexAttribPointer(2,3,GL_FLOAT,GL_FALSE,0,0);
 
     glDrawArrays(GL_TRIANGLES,0,shuttle.getNumVertices());
 }
 
+void installLights(glm::mat4 vMat){
+    currentLightPos = glm::vec3(initialLightLoc.x, initialLightLoc.y, initialLightLoc.z);
+    // convert light's position to view space, and save it in a float array
+    lightPosV = glm::vec3(vMat * glm::vec4(currentLightPos, 1.0));
+    lightPos[0] = lightPosV.x;
+    lightPos[1] = lightPosV.y;
+    lightPos[2] = lightPosV.z;
+
+    // get the locations of the light and material fields in the shader
+    globalAmbLoc = glGetUniformLocation(renderingProgram, "globalAmbient");
+    ambLoc = glGetUniformLocation(renderingProgram, "light.ambient");
+    diffLoc = glGetUniformLocation(renderingProgram, "light.diffuse");
+    specLoc = glGetUniformLocation(renderingProgram, "light.specular");
+    lPosLoc = glGetUniformLocation(renderingProgram, "light.position");
+    mAmbLoc = glGetUniformLocation(renderingProgram, "material.ambient");
+    mDiffLoc = glGetUniformLocation(renderingProgram, "material.diffuse");
+    mSpecLoc = glGetUniformLocation(renderingProgram, "material.specular");
+    mShinLoc = glGetUniformLocation(renderingProgram, "material.shininess");
+
+    // set the uniform light and material values in the shader
+    glProgramUniform4fv(renderingProgram, globalAmbLoc, 1, globalAmbient);
+    glProgramUniform4fv(renderingProgram, ambLoc, 1, lightAmbient);
+    glProgramUniform4fv(renderingProgram, diffLoc, 1, lightDiffuse);
+    glProgramUniform4fv(renderingProgram, specLoc, 1, lightSpecular);
+    glProgramUniform3fv(renderingProgram, lPosLoc, 1, lightPos.data());
+    glProgramUniform4fv(renderingProgram, mAmbLoc, 1, matAmb);
+    glProgramUniform4fv(renderingProgram, mDiffLoc, 1, matDif);
+    glProgramUniform4fv(renderingProgram, mSpecLoc, 1, matSpe);
+    glProgramUniform1f(renderingProgram, mShinLoc, matShi);
+}
+
 double lastTime=0;
 
 void display(GLFWwindow* window, double currentTime) {
@@ -198,35 +252,53 @@ void display(GLFWwindow* window, double currentTime) {
     glUseProgram(renderingProgram);
     glEnable(GL_DEPTH_TEST);
     glDepthFunc(GL_LEQUAL);
+    glEnable(GL_CULL_FACE);
+    glFrontFace(GL_CCW);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);  
     glEnableVertexAttribArray(0);
     glEnableVertexAttribArray(1);
     glEnableVertexAttribArray(2);
 
     mvLoc=glGetUniformLocation(renderingProgram,"mv_matrix");
     projLoc=glGetUniformLocation(renderingProgram,"proj_matrix");
+    nLoc = glGetUniformLocation(renderingProgram, "norm_matrix");
 
     glfwGetFramebufferSize(window,&width,&height);
     aspect=(float)width/(float)height;
     pMat=glm::perspective(utils::degToRad(60),aspect,0.1f,1000.f);
 
     vMat=glm::translate(glm::mat4(1.0f),glm::vec3{camera.x,camera.y,camera.z});
-    vMat=glm::lookAt(glm::vec3{camera.x,camera.y,camera.z},{0,-3,0},{0,1,0});
+
+    installLights(vMat);
+
+    //vMat=glm::lookAt(glm::vec3{camera.x,camera.y,camera.z},{0,-3,0},{0,1,0});
     
-    mMat=glm::translate(glm::mat4(1.0f),{0.f,0.f,0.f});
+    mMat=glm::translate(glm::mat4(1.0f),{0.f,-2.f,0.f});
-    mMat=glm::rotate(mMat,float(currentTime/4),{0.f,1.f,-0.2f});
+    mMat=glm::rotate(mMat,float(currentTime/4),{0.f,1.f,0.2f});
-    mMat=glm::scale(mMat,{8,8,8});
+    mMat=glm::scale(mMat,{7,7,7});
     mvMat=vMat*mMat;
 
+    invTrMat=glm::transpose(glm::inverse(mvMat));
+
     //DrawSphere();
 
     DrawShuttle();
+
     
-    mMat=glm::translate(glm::mat4(1.0f),{0.f,-3.f,0.f});
+    glProgramUniform4fv(renderingProgram, mAmbLoc, 1, matAmb2);
-    mMat=glm::rotate(mMat,float(currentTime/4),{0.f,1.f,0.4f});
+    glProgramUniform4fv(renderingProgram, mDiffLoc, 1, matDif2);
-    mMat=glm::scale(mMat,{3,0.1,3});
+    glProgramUniform4fv(renderingProgram, mSpecLoc, 1, matSpe2);
+    glProgramUniform1f(renderingProgram, mShinLoc, matShi2);
+    
+    mMat=glm::translate(glm::mat4(1.0f),{4.f,2.f,0.f});
+    mMat=glm::rotate(mMat,float(currentTime/4),{1.f,0.f,0.f});
+    mMat=glm::scale(mMat,{3,3,3});
     mvMat=vMat*mMat;
+
+    invTrMat=glm::transpose(glm::inverse(mvMat));
     
-    //DrawTorus();
+    DrawTorus();
 }
 
 int main(void) {

Lighting/utils.h

@@ -91,4 +91,34 @@ public:
         }
         return textureID;
     }
+
+    // GOLD material - ambient, diffuse, specular, and shininess
+    inline static float* goldAmbient() { static float a[4] = { 0.2473f, 0.1995f, 0.0745f, 1 }; return (float*)a; }
+    inline static float* goldDiffuse() { static float a[4] = { 0.7516f, 0.6065f, 0.2265f, 1 }; return (float*)a; }
+    inline static float* goldSpecular() { static float a[4] = { 0.6283f, 0.5558f, 0.3661f, 1 }; return (float*)a; }
+    inline static float goldShininess() { return 51.2f; }
+
+    // SILVER material - ambient, diffuse, specular, and shininess
+    inline static float* silverAmbient() { static float a[4] = { 0.1923f, 0.1923f, 0.1923f, 1 }; return (float*)a; }
+    inline static float* silverDiffuse() { static float a[4] = { 0.5075f, 0.5075f, 0.5075f, 1 }; return (float*)a; }
+    inline static float* silverSpecular() { static float a[4] = { 0.5083f, 0.5083f, 0.5083f, 1 }; return (float*)a; }
+    inline static float silverShininess() { return 51.2f; }
+
+    // BRONZE material - ambient, diffuse, specular, and shininess
+    inline static float* bronzeAmbient() { static float a[4] = { 0.2125f, 0.1275f, 0.0540f, 1 }; return (float*)a; }
+    inline static float* bronzeDiffuse() { static float a[4] = { 0.7140f, 0.4284f, 0.1814f, 1 }; return (float*)a; }
+    inline static float* bronzeSpecular() { static float a[4] = { 0.3935f, 0.2719f, 0.1667f, 1 }; return (float*)a; }
+    inline static float bronzeShininess() { return 25.6f; }
+
+    // JADE material - ambient, diffuse, specular, and shininess
+    inline static float* jadeAmbient() { static float a[4] = { 0.135f, 0.2225f, 0.1575f, 0.95f }; return (float*)a; }
+    inline static float* jadeDiffuse() { static float a[4] = { 0.540f, 0.89f, 0.63f, 0.95f }; return (float*)a; }
+    inline static float* jadeSpecular() { static float a[4] = { 0.3162f, 0.3162f, 0.3162f, 0.95f }; return (float*)a; }
+    inline static float jadeShininess() { return 12.8f; }
+
+    // PEARL material - ambient, diffuse, specular, and shininess
+    inline static float* pearlAmbient() { static float a[4] = { 0.25f, 0.2073f, 0.2073f, 0.922f }; return (float*)a; }
+    inline static float* pearlDiffuse() { static float a[4] = { 1.f, 0.829f, 0.829f, 0.922f }; return (float*)a; }
+    inline static float* pearlSpecular() { static float a[4] = { 0.2966f, 0.2966f, 0.2966f, 0.922f }; return (float*)a; }
+    inline static float pearlShininess() { return 11.264f; }
 };

Lighting/vertShader.glsl

@@ -4,15 +4,39 @@ layout (location=1) in vec2 texCoords;
 layout (location=2) in vec3 normals;
 uniform mat4 mv_matrix;
 uniform mat4 proj_matrix;
+uniform mat4 norm_matrix;
 out vec2 uv;
+out vec3 varyingNormal;       // eye-space vertex normal
+out vec3 varyingLightDir;     // vector pointing to the light
+out vec3 varyingVertPos;      // vertex position in eye space
+out vec3 varyingHalfVector;
 
 mat4 buildTranslate(float x, float y, float z);
 mat4 buildRotateX(float rad);
 mat4 buildRotateY(float rad);
 mat4 buildRotateZ(float rad);
 
+struct PositionalLight
+{  vec4 ambient;
+   vec4 diffuse;
+   vec4 specular;
+   vec3 position;
+};
+struct Material
+{  vec4 ambient;
+   vec4 diffuse;
+   vec4 specular;
+   float shininess;
+};
+uniform PositionalLight light;
+uniform Material material;
+
 void main(void)
 {
+    varyingVertPos=(mv_matrix * vec4(position,1.0)).xyz;
+    varyingLightDir = light.position - varyingVertPos;
+    varyingNormal=(norm_matrix * vec4(normals,1.0)).xyz;
+    varyingHalfVector=(varyingLightDir-varyingVertPos).xyz;
 	gl_Position=proj_matrix*mv_matrix*vec4(position,1.0);
     uv=texCoords;
 }

LoadingModels/main.cpp

@@ -117,13 +117,13 @@ void setupVertices(void) {
         nvalues.push_back(normals[i].z);
     }
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[7]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[8]);
     glBufferData(GL_ARRAY_BUFFER, pvalues.size()*sizeof(float), pvalues.data(), GL_STATIC_DRAW);
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[8]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[9]);
     glBufferData(GL_ARRAY_BUFFER, tvalues.size()*sizeof(float), tvalues.data(),GL_STATIC_DRAW);
 
-    glBindBuffer(GL_ARRAY_BUFFER, vbo[9]);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo[10]);
     glBufferData(GL_ARRAY_BUFFER, nvalues.size()*sizeof(float), nvalues.data(), GL_STATIC_DRAW);
 }
 
@@ -175,11 +175,11 @@ void DrawTorus(){
 void DrawShuttle(){
     glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat));
     glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
-    glBindBuffer(GL_ARRAY_BUFFER,vbo[7]);
-    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[8]);
-    glVertexAttribPointer(1,2,GL_FLOAT,GL_FALSE,0,0);
+    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
     glBindBuffer(GL_ARRAY_BUFFER,vbo[9]);
+    glVertexAttribPointer(1,2,GL_FLOAT,GL_FALSE,0,0);
+    glBindBuffer(GL_ARRAY_BUFFER,vbo[10]);
     glVertexAttribPointer(2,3,GL_FLOAT,GL_FALSE,0,0);
 
     glDrawArrays(GL_TRIANGLES,0,shuttle.getNumVertices());
@@ -226,7 +226,7 @@ void display(GLFWwindow* window, double currentTime) {
     mMat=glm::scale(mMat,{3,0.1,3});
     mvMat=vMat*mMat;
     
-    //DrawTorus();
+    DrawTorus();
 }
 
 int main(void) {