Add vertex color array

.gitmodules

@@ -28,3 +28,6 @@
 [submodule "lib/lodepng"]
 	path = lib/lodepng
 	url = https://github.com/lvandeve/lodepng
+[submodule "lib/assimp"]
+	path = lib/assimp
+	url = git@github.com:assimp/assimp.git

CMakeLists.txt

@@ -2,7 +2,7 @@
 # Specify minimum CMake version and project name
 #
 cmake_minimum_required (VERSION 3.0)
-project (glowbox)
+project (plain_of_awesome)
 
 #
 # CMake setup
@@ -37,6 +37,12 @@ option (SFML_BUILD_WINDOW OFF)
 option (SFML_BUILD_NETWORK OFF)
 add_subdirectory(lib/SFML)
 
+# assimp
+set(BUILD_ASSIMP_TOOLS  ON)
+set(ASSIMP_BUILD_STATIC_LIB ON)
+add_subdirectory(lib/assimp)
+link_directories("lib/assimp/build/code")
+
 #
 # Set include paths
 #
@@ -47,6 +53,7 @@ include_directories (src/
                      lib/glm/
                      lib/stb/
                      lib/arrrgh/
+                     lib/assimp/include/
                      lib/SFML/include/)
 
 #
@@ -88,5 +95,6 @@ add_executable (${PROJECT_NAME} ${PROJECT_SOURCES} ${PROJECT_HEADERS}
 target_link_libraries (${PROJECT_NAME}
                        glfw
                        sfml-audio
+                       assimp
                        ${GLFW_LIBRARIES}
                        ${GLAD_LIBRARIES})

lib/assimp

@@ -0,0 +1 @@
+Subproject commit e899067f440c79747549772fef61abe916bd496e

res/shaders/simple.frag

@@ -3,8 +3,9 @@
 in layout(location = 0) vec3 vertex;
 in layout(location = 1) vec3 normal;
 in layout(location = 2) vec2 UV;
-in layout(location = 3) vec3 tangent;
+in layout(location = 3) vec4 color;
-in layout(location = 4) vec3 bitangent;
+in layout(location = 4) vec3 tangent;
+in layout(location = 5) vec3 bitangent;
 
 layout(binding = 0) uniform sampler2D diffuseTexture;
 layout(binding = 1) uniform sampler2D normalTexture;
@@ -15,10 +16,12 @@ uniform mat4 MVP;
 uniform mat4 MV;
 uniform mat4 MVnormal;
 
-uniform float shinyness;
+uniform float shininess;
+uniform vec4 basecolor;
 
 uniform bool isIlluminated;
 uniform bool isTextured;
+uniform bool isColorMapped;
 uniform bool isNormalMapped;
 uniform bool isDisplacementMapped;
 uniform bool isInverted;
@@ -40,7 +43,7 @@ struct Light { // point lights, coordinates in MV space
 uniform Light light[N_LIGHTS];
 
 
-out vec4 color;
+out vec4 color_out;
 
 
 vec4 phong(vec4 basecolor) {
@@ -102,7 +105,7 @@ vec4 phong(vec4 basecolor) {
         float diffuse_i = dot(nnormal, L);
         float specular_i = dot(reflect(-L, nnormal), -normalize(vertex));
         specular_i = (specular_i>0)
-            ? pow(specular_i, shinyness)
+            ? pow(specular_i, shininess)
             : 0;
 
         emmissive_component += light[i].color_emissive;
@@ -114,14 +117,10 @@ vec4 phong(vec4 basecolor) {
 }
 
 void main() {
-    if(isIlluminated) {
+    vec4 c = basecolor;
-        if (isTextured) {
+    if (isColorMapped) c *= color;
-            color = phong(texture(diffuseTexture, UV));
+    if (isTextured)    c *= texture(diffuseTexture, UV);
-        } else {
+    if (isIlluminated) c = phong(c);
-            color = phong(vec4(1.0));
+    if (isInverted)    c.rgb = 1 - c.rgb;
-        }
+    color_out = c;
-    } else {
-        color = texture(diffuseTexture, UV);
-    }
-    if (isInverted) color.rgb = 1 - color.rgb;
 }

res/shaders/simple.vert

@@ -3,8 +3,9 @@
 in layout(location = 0) vec3 position;
 in layout(location = 1) vec3 normal;
 in layout(location = 2) vec2 UV;
-in layout(location = 3) vec3 tangent;
+in layout(location = 3) vec4 color;
-in layout(location = 4) vec3 bitangent;
+in layout(location = 4) vec3 tangent;
+in layout(location = 5) vec3 bitangent;
 
 layout(binding = 2) uniform sampler2D displacementTexture;
 uniform float displacementCoefficient;
@@ -13,7 +14,7 @@ uniform mat4 MVP;
 uniform mat4 MV;
 uniform mat4 MVnormal;
 
-uniform float shinyness;
+uniform float shininess;
 uniform vec2 uvOffset;
 
 uniform bool isIlluminated;
@@ -25,8 +26,9 @@ uniform bool isInverted;
 out layout(location = 0) vec3 vertex_out;
 out layout(location = 1) vec3 normal_out;
 out layout(location = 2) vec2 uv_out;
-out layout(location = 3) vec3 tangent_out;
+out layout(location = 3) vec4 color_out;
-out layout(location = 4) vec3 bitangent_out;
+out layout(location = 4) vec3 tangent_out;
+out layout(location = 5) vec3 bitangent_out;
 
 void main() {
     vec3 displacement = vec3(0.0);
@@ -43,6 +45,8 @@ void main() {
     uv_out = UV + uvOffset;
     gl_Position =  MVP * vec4(position+displacement, 1.0f);
     
+    color_out = color;
+
     tangent_out = normalize(vec3(MVnormal * vec4(tangent, 1.0f)));
     bitangent_out = normalize(vec3(MVnormal * vec4(bitangent, 1.0f)));
 }

src/gamelogic.cpp

@@ -132,7 +132,7 @@ void initGame(GLFWwindow* window, CommandLineOptions gameOptions) {
     plainNode->setTexture(&t_plain_diff, &t_plain_normal, &t_perlin);
     plainNode->setMesh(&plain);
     plainNode->position = {0, 0, 0};
-    plainNode->shinyness = 20;
+    plainNode->shininess = 20;
     plainNode->displacementCoefficient = 40;
     rootNode->children.push_back(plainNode);
     
@@ -142,7 +142,7 @@ void initGame(GLFWwindow* window, CommandLineOptions gameOptions) {
     boxNode->position = {500, 500, 40};
     boxNode->referencePoint = {25, 25, 25};
     boxNode->scale *= 2;
-    boxNode->shinyness = 20;
+    boxNode->shininess = 20;
     boxNode->displacementCoefficient = 40;
     rootNode->children.push_back(boxNode);
 
@@ -258,7 +258,7 @@ void updateFrame(GLFWwindow* window, int windowWidth, int windowHeight) {
     // update positions of nodes (like the car)
     plainNode->uvOffset.x += timeDelta*0.5;
     plainNode->uvOffset.y -= timeDelta*0.5;
-    boxNode->rotation.z += timeDelta;
+    if (boxNode) boxNode->rotation.z += timeDelta;
     lightNode[1]->rotation.z -= timeDelta;
 }
 
@@ -312,9 +312,11 @@ void renderNode(SceneNode* node, Gloom::Shader* parent_shader = default_shader)
                 glUniformMatrix4fv(s->location("MV")      , 1, GL_FALSE, glm::value_ptr(node->MV));
                 glUniformMatrix4fv(s->location("MVnormal"), 1, GL_FALSE, glm::value_ptr(node->MVnormal));
                 glUniform2fv(s->location("uvOffset")      , 1,           glm::value_ptr(node->uvOffset));
-                glUniform1f( s->location("shinyness"),               node->shinyness);
+                glUniform4fv(s->location("basecolor")     , 1,           glm::value_ptr(node->basecolor));
+                glUniform1f( s->location("shininess"),               node->shininess);
                 glUniform1f( s->location("displacementCoefficient"), node->displacementCoefficient);
                 glUniform1ui(s->location("isTextured"),              node->isTextured);
+                glUniform1ui(s->location("isColorMapped"),           node->isColorMapped);
                 glUniform1ui(s->location("isNormalMapped"),          node->isNormalMapped);
                 glUniform1ui(s->location("isDisplacementMapped"),    node->isDisplacementMapped);
                 glUniform1ui(s->location("isIlluminated"),           node->isIlluminated);
@@ -330,7 +332,7 @@ void renderNode(SceneNode* node, Gloom::Shader* parent_shader = default_shader)
         case SPOT_LIGHT:
         case POINT_LIGHT: {
             uint id = node->lightID;
-            lights[id].position          = vec3(node->MV * vec4(1.0));
+            lights[id].position          = vec3(node->MV * vec4(vec3(0.0), 1.0));
             lights[id].is_spot           = node->nodeType == SPOT_LIGHT;
             lights[id].spot_target       = node->rotation; // already MV space, todo: change this
             lights[id].spot_cuttof_angle = glm::sin(node->spot_cuttof_angle);

src/sceneGraph.hpp

@@ -18,6 +18,7 @@
 
 using glm::vec2;
 using glm::vec3;
+using glm::vec4;
 using glm::mat4;
 using std::map;
 using std::vector;
@@ -34,17 +35,18 @@ struct SceneNode {
         nodeType = type;
 	}
 	
-	void setMesh(Mesh* mesh) {
+	void setMesh(const Mesh* mesh) {
-		static map<Mesh*, int> cache;
+		static map<const Mesh*, int> cache;
 
 		if (cache.find(mesh) == cache.end())
 			cache[mesh] = generateBuffer(*mesh, isNormalMapped || isDisplacementMapped);
 
 		vertexArrayObjectID = cache[mesh];
 		VAOIndexCount = mesh->indices.size();
+		isColorMapped = ! mesh->colors.empty();
 	}
-	void setTexture(PNGImage* diffuse, PNGImage* normal=nullptr, PNGImage* displacement=nullptr) {
+	void setTexture(const PNGImage* diffuse, const PNGImage* normal=nullptr, const PNGImage* displacement=nullptr) {
-		static map<PNGImage*, int> cache;
+		static map<const PNGImage*, int> cache;
 		assert(vertexArrayObjectID==-1);
 		isTextured = false;
 		isNormalMapped = false;
@@ -96,7 +98,8 @@ struct SceneNode {
 	uint VAOIndexCount = 0;
 
 	// textures
-	float shinyness = 10.0; // specular power
+	float shininess = 10.0; // specular power
+	vec4 basecolor = vec4(1.0);
 	vec2 uvOffset = vec2(0.0, 0.0); // specular power
 	uint diffuseTextureID;
 	uint normalTextureID;
@@ -105,6 +108,7 @@ struct SceneNode {
 
 	// shader flags
 	bool isTextured = false;
+	bool isColorMapped = false;
 	bool isNormalMapped = false;
 	bool isDisplacementMapped = false;
 	bool isIlluminated = true;

src/utilities/glutils.cpp

@@ -4,11 +4,12 @@
 #include "glutils.h"
 
 using std::vector;
+using glm::vec4;
 using glm::vec3;
 using glm::vec2;
 typedef unsigned int uint;
 
-uint generateBuffer(Mesh &mesh, bool isNormalMapped) {
+uint generateBuffer(const Mesh &mesh, bool doAddTangents) {
     uint vaoID;
     glGenVertexArrays(1, &vaoID);
     glBindVertexArray(vaoID);
@@ -32,21 +33,31 @@ uint generateBuffer(Mesh &mesh, bool isNormalMapped) {
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferID);
     glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh.indices.size() * sizeof(uint), mesh.indices.data(), GL_STATIC_DRAW);
 
-    if (mesh.textureCoordinates.empty()) return vaoID;
+    if (!mesh.textureCoordinates.empty()) {
-    
         uint textureBufferID;
         glGenBuffers(1, &textureBufferID);
         glBindBuffer(GL_ARRAY_BUFFER, textureBufferID);
         glBufferData(GL_ARRAY_BUFFER, mesh.textureCoordinates.size() * sizeof(vec2), mesh.textureCoordinates.data(), GL_STATIC_DRAW);
         glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), 0);
         glEnableVertexAttribArray(2);
+    }
 
-    if (isNormalMapped) addTangents(vaoID, mesh);
+    if (!mesh.colors.empty()) {
+        uint colorBufferID;
+        glGenBuffers(1, &colorBufferID);
+        glBindBuffer(GL_ARRAY_BUFFER, colorBufferID);
+        glBufferData(GL_ARRAY_BUFFER, mesh.colors.size() * sizeof(vec4), mesh.colors.data(), GL_STATIC_DRAW);
+        glVertexAttribPointer(3, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
+        glEnableVertexAttribArray(3);
+    }
+
+    if (doAddTangents && !mesh.textureCoordinates.empty())
+        addTangents(vaoID, mesh);
     
     return vaoID;
 }
 
-void addTangents(uint vaoID, Mesh& mesh) {
+void addTangents(uint vaoID, const Mesh& mesh) {
     vector<vec3> tangents(mesh.vertices.size());
     vector<vec3> bitangents(mesh.vertices.size());
     
@@ -95,15 +106,15 @@ void addTangents(uint vaoID, Mesh& mesh) {
     glGenBuffers(1, &tangentBufferID);
     glBindBuffer(GL_ARRAY_BUFFER, tangentBufferID);
     glBufferData(GL_ARRAY_BUFFER, mesh.vertices.size() * sizeof(vec3), tangents.data(), GL_STATIC_DRAW);
-    glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), 0);
+    glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), 0);
-    glEnableVertexAttribArray(3);
+    glEnableVertexAttribArray(4);
     
     uint bitangentBufferID;
     glGenBuffers(1, &bitangentBufferID);
     glBindBuffer(GL_ARRAY_BUFFER, bitangentBufferID);
     glBufferData(GL_ARRAY_BUFFER, mesh.vertices.size() * sizeof(vec3), bitangents.data(), GL_STATIC_DRAW);
-    glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), 0);
+    glVertexAttribPointer(5, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), 0);
-    glEnableVertexAttribArray(4);
+    glEnableVertexAttribArray(5);
 }
 
 uint generateTexture(const PNGImage& texture) {

src/utilities/glutils.h

@@ -4,8 +4,8 @@
 #include "imageLoader.hpp"
 
 
-unsigned int generateBuffer(Mesh &mesh, bool isNormalMapped = false);
+unsigned int generateBuffer(const Mesh &mesh, bool doAddTangents=false);
 
-void addTangents(unsigned int vaoID, Mesh& mesh);
+void addTangents(unsigned int vaoID, const Mesh& mesh);
 
 unsigned int generateTexture(const PNGImage& texture);

src/utilities/mesh.h

@@ -7,6 +7,7 @@ struct Mesh {
     std::vector<glm::vec3> vertices;
     std::vector<glm::vec3> normals;
     std::vector<glm::vec2> textureCoordinates;
+    std::vector<glm::vec4> colors;
 
     std::vector<unsigned int> indices;
 };