ex1 done

.gitignore

@@ -30,3 +30,5 @@
 *.exe
 *.out
 *.app
+
+build/

res/shaders/simple.frag

@@ -1,12 +1,67 @@
 #version 430 core
 
 in layout(location = 0) vec3 normal;
+in layout(location = 1) vec3 vertex;
+
+// point lights
+struct Light {
+    vec3 position;
+    mat4 MV;
+    bool is_spot;
+    vec3 spot_target; // MV space coordinates
+};
+
+#define N_LIGHTS 3
+
+uniform Light light[N_LIGHTS];
 
 out vec4 color;
 
+// constants
+float shininess = 15;
+vec3 c_diffuse = vec3(0.75390625, 0.4296875, 0.4375);
+vec3 c_emissive = vec3(0.01171875, 0.0, 0.15234375);
+vec3 c_specular = vec3(0.9453125, 0.94921875, 0.84765625);
+
+float spot_cuttof_angle = cos(4 / 180.0 * 3.1415926535);
+
 void main()
 {
-    float intensity = dot(normalize(normal), vec3(0, 0, 1));
-    color = vec4(0.5 * normal + 0.5, 1.0);
-    //color = vec4(intensity, intensity, intensity, 1.0f);
+    vec3 nnormal = normalize(normal);
+
+    float diffuse_intensity = 0.0;
+    float specular_intensity = 0.0;
+
+    for (int i = 0; i<3; i++) {
+        vec3 L = vec3(light[i].MV * vec4(light[i].position, 1.0f)) - vertex;
+        float attenuation = clamp(1000/(1 + 40*length(L) + 0.1*length(L)*length(L)), 0.0, 1.25);
+        L = normalize(L);
+
+        if (light[i].is_spot) {
+            vec3 L2 = normalize(vec3(light[i].MV * vec4(light[i].position, 1.0f)) - light[i].spot_target);
+            if (dot(L2, L) < spot_cuttof_angle) {
+                continue;
+            }
+            attenuation *= 70;
+        }
+
+        float diffuse_i = dot(nnormal, L);
+
+        float specular_i = pow(dot(reflect(-L, nnormal), normalize(vec3(0,0,0) - vertex)), shininess);
+
+
+        if (diffuse_i > 0)  diffuse_intensity  += attenuation*diffuse_i;
+        if (specular_i > 0) specular_intensity += attenuation*specular_i;
+    }
+
+    //diffuse_intensity *= 1.0 / N_LIGHTS;
+    //specular_intensity *= 1.0 / N_LIGHTS;
+
+
+    //float intensity = dot(normalize(normal), normalize(light_pos_2));
+    //color = vec4(0.5 * normal + 0.5, 1.0);
+
+    color = vec4(c_emissive
+        + c_diffuse*diffuse_intensity
+        + c_specular*specular_intensity, 1.0f);
 }

res/shaders/simple.vert

@@ -4,11 +4,16 @@ in layout(location = 0) vec3 position;
 in layout(location = 1) vec3 normal_in;
 
 uniform layout(location = 3) mat4 MVP;
+uniform layout(location = 4) mat4 MV;
+uniform layout(location = 5) mat4 MVnormal;
+
 
 out layout(location = 0) vec3 normal_out;
+out layout(location = 1) vec3 vertex_out;
 
 void main()
 {
-    normal_out = normal_in;
+    normal_out = normalize(vec3(MVnormal * vec4(normal_in, 1.0f)));
+    vertex_out = vec3(MV*vec4(position, 1.0f));
     gl_Position =  MVP * vec4(position, 1.0f);
 }

src/gamelogic.cpp

@@ -12,6 +12,7 @@
 #include <SFML/Audio/Sound.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
+#include <string>
 #include "gamelogic.h"
 #include "sceneGraph.hpp"
 
@@ -33,6 +34,8 @@ SceneNode* boxNode;
 SceneNode* ballNode;
 SceneNode* padNode;
 
+SceneNode* lightNode[3];
+
 double ballRadius = 3.0f;
 
 // These are heap allocated, because they should not be initialised at the start of the program
@@ -55,7 +58,7 @@ bool hasLost = false;
 bool jumpedToNextFrame = false;
 
 // Modify if you want the music to start further on in the track. Measured in seconds.
-const float debug_startTime = 0;
+const float debug_startTime = 45;
 double totalElapsedTime = debug_startTime;
 
 
@@ -125,12 +128,28 @@ void initGame(GLFWwindow* window, CommandLineOptions gameOptions) {
     ballNode->vertexArrayObjectID = ballVAO;
     ballNode->VAOIndexCount = sphere.indices.size();
 
+    // task 1a, add point lights
+    for (int i = 0; i<3; i++) {
+        lightNode[i] = createSceneNode();
+        lightNode[i]->nodeType = SceneNodeType::POINT_LIGHT;
+        lightNode[i]->lightID = i;
+    }
+    rootNode->children.push_back(lightNode[0]);
+    rootNode->children.push_back(lightNode[1]);
+    ballNode->children.push_back(lightNode[2]);
+    lightNode[0]->position = {boxDimensions.x/2 - 10, boxDimensions.y/2 - 10, boxDimensions.z/2 - 10};
+    lightNode[1]->position = {300,300,400};
+    lightNode[2]->position = {0, 0, 0};
+
+    lightNode[1]->nodeType = SPOT_LIGHT;
+    padNode->targeted_by = lightNode[1];
+
     getTimeDeltaSeconds();
 
     std::cout << "Ready. Click to start!" << std::endl;
 }
 
-void updateNodeTransformations(SceneNode* node, glm::mat4 transformationThusFar) {
+void updateNodeTransformations(SceneNode* node, glm::mat4 transformationThusFar, glm::mat4 V, glm::mat4 P) {
 
     glm::mat4 transformationMatrix(1.0);
 
@@ -146,17 +165,30 @@ void updateNodeTransformations(SceneNode* node, glm::mat4 transformationThusFar)
                     * glm::scale(glm::mat4(1.0), node->scale);
             break;
         case POINT_LIGHT:
-
-            break;
         case SPOT_LIGHT:
-
+            transformationMatrix =
+                    glm::translate(glm::mat4(1.0), node->position);
             break;
     }
+    glm::mat4 M = transformationThusFar * transformationMatrix;
+    glm::mat4 MV = V*M;
 
-    node->currentTransformationMatrix = transformationThusFar * transformationMatrix;
+    node->currentTransformationMatrixMV = MV;
+    node->currentTransformationMatrix = P*MV;
+    node->currentTransformationMatrixMVnormal = glm::inverse(glm::transpose(MV));
 
     for(SceneNode* child : node->children) {
-        updateNodeTransformations(child, node->currentTransformationMatrix);
+        updateNodeTransformations(child, M, V, P);
+    }
+
+    if (node->targeted_by != nullptr) {
+        assert(node->targeted_by->nodeType == SPOT_LIGHT);
+        node->targeted_by->rotation = glm::vec3(MV*glm::vec4(node->position, 1.0));
+
+        //std::cout << node->targeted_by->rotation[0]
+        //    << " " << node->targeted_by->rotation[1]
+        //    << " " << node->targeted_by->rotation[2]
+        //    << std::endl;
     }
 }
 
@@ -295,9 +327,7 @@ void updateFrame(GLFWwindow* window) {
                                 * glm::rotate(glm::mat4(1.0), 0.2f, glm::vec3(1, 0, 0))
                                 * glm::rotate(glm::mat4(1.0), float(M_PI), glm::vec3(0, 1, 0));
 
-    glm::mat4 VP = projection * cameraTransform;
-
-    updateNodeTransformations(rootNode, VP);
+    updateNodeTransformations(rootNode, glm::mat4(1.0), cameraTransform, projection);
 
     boxNode->position = {-boxDimensions.x / 2, -boxDimensions.y / 2 - 15, boxDimensions.z - 10};
     padNode->position = {-boxDimensions.x / 2 + (1 - padPositionX) * (boxDimensions.x - padDimensions.x),
@@ -313,6 +343,8 @@ void updateFrame(GLFWwindow* window) {
 
 void renderNode(SceneNode* node) {
     glUniformMatrix4fv(3, 1, GL_FALSE, glm::value_ptr(node->currentTransformationMatrix));
+    glUniformMatrix4fv(4, 1, GL_FALSE, glm::value_ptr(node->currentTransformationMatrixMV));
+    glUniformMatrix4fv(5, 1, GL_FALSE, glm::value_ptr(node->currentTransformationMatrixMVnormal));
 
     switch(node->nodeType) {
         case GEOMETRY:
@@ -320,14 +352,20 @@ void renderNode(SceneNode* node) {
                 glBindVertexArray(node->vertexArrayObjectID);
                 glDrawElements(GL_TRIANGLES, node->VAOIndexCount, GL_UNSIGNED_INT, nullptr);
             }
-            break;
-        case POINT_LIGHT:
-
             break;
         case SPOT_LIGHT:
+        case POINT_LIGHT: {
+            std::string pre = "light[" + std::to_string(node->lightID) + "]";
+
+            glUniform3fv(shader->location(pre+".position"), 1, glm::value_ptr(node->position));
+            glUniformMatrix4fv(shader->location(pre+".MV"), 1, GL_FALSE, glm::value_ptr(node->currentTransformationMatrixMV));
+
+            glUniform1i(shader->location(pre+".is_spot"), node->nodeType == SPOT_LIGHT);
+            glUniform3fv(shader->location(pre+".spot_target"), 1, glm::value_ptr(node->rotation));
 
             break;
         }
+    }
 
     for(SceneNode* child : node->children) {
         renderNode(child);

src/program.cpp

@@ -57,7 +57,8 @@ void runProgram(GLFWwindow* window, CommandLineOptions options)
 void handleKeyboardInput(GLFWwindow* window)
 {
     // Use escape key for terminating the GLFW window
-    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS
+        || glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
     {
         glfwSetWindowShouldClose(window, GL_TRUE);
     }

src/sceneGraph.hpp

@@ -32,6 +32,7 @@ struct SceneNode {
         VAOIndexCount = 0;
 
         nodeType = GEOMETRY;
+		targeted_by = nullptr;
 	}
 
 	// A list of all children that belong to this node.
@@ -44,7 +45,9 @@ struct SceneNode {
 	glm::vec3 scale;
 
 	// A transformation matrix representing the transformation of the node's location relative to its parent. This matrix is updated every frame.
-	glm::mat4 currentTransformationMatrix;
+	glm::mat4 currentTransformationMatrix; // MVP
+	glm::mat4 currentTransformationMatrixMV; // MV
+	glm::mat4 currentTransformationMatrixMVnormal; // transpose(inverse(MV))
 
 	// The location of the node's reference point
 	glm::vec3 referencePoint;
@@ -55,6 +58,10 @@ struct SceneNode {
 
 	// Node type is used to determine how to handle the contents of a node
 	SceneNodeType nodeType;
+
+	// for lights:
+	unsigned int lightID;
+	SceneNode* targeted_by; // spot
 };
 
 // Struct for keeping track of 2D coordinates

src/utilities/shader.hpp

@@ -19,6 +19,11 @@ namespace Gloom
     public:
         Shader()            { mProgram = glCreateProgram(); }
 
+        // hack?:
+        GLint location(std::string const& name) {
+            return glGetUniformLocation(mProgram, name.c_str());
+        }
+
         // Public member functions
         void   activate()   { glUseProgram(mProgram); }
         void   deactivate() { glUseProgram(0); }