Revamp the shader and lighting system

res/shaders/simple.frag

@@ -1,102 +1,95 @@
 #version 430 core
 
-in layout(location = 0) vec3 normal;
+in layout(location = 0) vec3 vertex;
-in layout(location = 1) vec3 vertex;
+in layout(location = 1) vec3 normal;
 in layout(location = 2) vec2 UV;
 in layout(location = 3) mat3 TBN;
 
 layout(binding = 0) uniform sampler2D diffuseTexture;
 layout(binding = 1) uniform sampler2D normalTexture;
+layout(binding = 2) uniform sampler2D displacementTexture;
+uniform float displacementCoefficient;
 
 uniform mat4 MVP;
 uniform mat4 MV;
 uniform mat4 MVnormal;
 
+uniform float shininess;
+
 uniform bool isIlluminated;
 uniform bool isTextured;
 uniform bool isNormalMapped;
+uniform bool isDisplacementMapped;
 uniform bool isInverted;
 
 // lights
-struct Light { // coordinates in MV space
+struct Light { // point lights, coordinates in MV space
     vec3 position;
-    vec3 spot_target; 
+    vec3 attenuation; // 1 / (x + y*l + z*l*l)
+    vec3 color_emissive;
+    vec3 color_diffuse;
+    vec3 color_specular;
+    
     bool is_spot; // false means point light
+    vec3 spot_target;
+    float spot_cuttof_angle;
 };
 
-//named 
+#define N_LIGHTS 1
-#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(1.5 / 180.0 * 3.1415926535);
+vec4 phong(vec4 basecolor) {
-
+    vec3 nnormal; // normalized normal
-void main_(vec4 basecolor) {
-    vec3 nnormal;
     if (isNormalMapped) {
         vec3 tangential = texture(normalTexture, UV).rgb * 2.0 - 1.0;
-        nnormal = TBN * -normalize(tangential);
+        nnormal = TBN * normalize(tangential);
-    } else {
+    }
+    else {
         nnormal = normalize(normal);
     }
 
-    float diffuse_intensity = 0.0;
+    vec3 emmissive_component = vec3(0.0);
-    float specular_intensity = 0.0;
+    vec3 diffuse_component   = vec3(0.0);
+    vec3 specular_component  = vec3(0.0);
 
-    for (int i = 0; i<3; i++) {
+    for (int i = 0; i<N_LIGHTS; i++) {
         vec3 L = light[i].position - vertex;
         float l = length(L);
-        float attenuation = clamp(2000/(1 + 1*l + 0.1*l*l), 0.0, 1.25);
         L = normalize(L);
 
         if (light[i].is_spot) {
-            vec3 L2 = normalize(light[i].position - light[i].spot_target);
+            if (dot(normalize(light[i].position - light[i].spot_target), L) < light[i].spot_cuttof_angle) {
-            if (dot(L2, L) < spot_cuttof_angle) {
                 continue;
             }
-            attenuation *= 30;
         }
 
+        float attenuation = clamp(1 / (
+            light[i].attenuation.x + 
+            light[i].attenuation.y * l + 
+            light[i].attenuation.z * l * l
+            ), 0.0, 1.25);
+
         float diffuse_i = dot(nnormal, L);
+        float specular_i = pow(dot(reflect(-L, nnormal), normalize(-vertex)), shininess);
 
-        float specular_i = pow(dot(reflect(-L, nnormal), normalize(vec3(0,0,0) - vertex)), shininess);
+        emmissive_component += light[i].color_emissive;
-
+        if (diffuse_i>0)  diffuse_component  += light[i].color_diffuse  * diffuse_i  * attenuation;
-
+        if (specular_i>0) specular_component += light[i].color_specular * specular_i * attenuation;
-        if (diffuse_i > 0)  diffuse_intensity  += attenuation*diffuse_i;
-        if (specular_i > 0) specular_intensity += attenuation*specular_i;
     }
 
-    //diffuse_intensity *= 1.0 / N_LIGHTS;
+    return vec4(basecolor.rgb * (emmissive_component + diffuse_component) + specular_component, basecolor.a);
-    //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 = basecolor * vec4(c_emissive
-        + c_diffuse*diffuse_intensity, 1.0f)
-        + vec4(c_specular*specular_intensity, 1.0f);
 }
 
-
-
 void main() {
     if(isIlluminated) {
         if (isTextured) {
-            c_diffuse = vec3(0.9);
+            color = phong(texture(diffuseTexture, UV));
-            c_emissive = vec3(0.2);
-            main_(texture(diffuseTexture, UV));
         } else {
-            main_(vec4(1.0));
+            color = phong(vec4(1.0));
-            
         }
     } else {
         color = texture(diffuseTexture, UV);

res/shaders/simple.vert

@@ -6,6 +6,9 @@ in layout(location = 2) vec2 UV;
 in layout(location = 3) vec3 tangent;
 in layout(location = 4) vec3 bitangent;
 
+layout(binding = 2) uniform sampler2D displacementTexture;
+uniform float displacementCoefficient;
+
 uniform mat4 MVP;
 uniform mat4 MV;
 uniform mat4 MVnormal;
@@ -13,8 +16,8 @@ uniform bool isIlluminated;
 uniform bool isTextured;
 uniform bool isNormalMapped;
 
-out layout(location = 0) vec3 normal_out;
+out layout(location = 0) vec3 vertex_out;
-out layout(location = 1) vec3 vertex_out;
+out layout(location = 1) vec3 normal_out;
 out layout(location = 2) vec2 uv_out;
 out layout(location = 3) mat3 TBN;
 

src/gamelogic.cpp

@@ -39,7 +39,8 @@ SceneNode* padNode;
 SceneNode* hudNode;
 SceneNode* textNode;
 
-SceneNode* lightNode[3];
+const uint N_LIGHTS = 1;
+SceneNode* lightNode[N_LIGHTS];
 
 // These are heap allocated, because they should not be initialised at the start of the program
 sf::Sound* sound;
@@ -122,7 +123,7 @@ void initGame(GLFWwindow* window, CommandLineOptions gameOptions) {
     plainNode->setTexture(&t_plain_diff, &t_plain_normal);
 
     // add lights
-    for (int i = 0; i<3; i++) {
+    for (uint i = 0; i<N_LIGHTS; i++) {
         lightNode[i] = createSceneNode(POINT_LIGHT);
         lightNode[i]->lightID = i;
     }
@@ -151,8 +152,6 @@ void updateNodeTransformations(SceneNode* node, mat4 transformationThusFar, mat4
     mat4 transformationMatrix(1.0);
 
     switch(node->nodeType) {
-        case NORMAL_TEXTURED_GEOMETRY:
-        case TEXTURED_GEOMETRY:
         case GEOMETRY:
             transformationMatrix =
                     glm::translate(mat4(1.0), node->position)
@@ -257,16 +256,26 @@ void renderNode(SceneNode* node, Gloom::Shader* parent_shader = default_shader)
         vec3  position;
         vec3  spot_target;
         bool  is_spot;
+        float spot_cuttof_angle;
+        vec3  attenuation;
+        vec3  color_emissive;
+        vec3  color_diffuse;
+        vec3  color_specular;
         
         void push_to_shader(Gloom::Shader* shader, uint id) {
             #define l(x) shader->location("light[" + std::to_string(id) + "]." + #x)
+                glUniform1i (l(is_spot)          ,    is_spot);
+                glUniform1f (l(spot_cuttof_angle),    spot_cuttof_angle);
                 glUniform3fv(l(position)         , 1, glm::value_ptr(position));
                 glUniform3fv(l(spot_target)      , 1, glm::value_ptr(spot_target));
-                glUniform1i       (l(is_spot)    ,    is_spot);
+                glUniform3fv(l(attenuation)      , 1, glm::value_ptr(attenuation));
+                glUniform3fv(l(color_emissive)   , 1, glm::value_ptr(color_emissive));
+                glUniform3fv(l(color_diffuse)    , 1, glm::value_ptr(color_diffuse));
+                glUniform3fv(l(color_specular)   , 1, glm::value_ptr(color_specular));
             #undef l
         }
     };
-    static Light lights[3];
+    static Light lights[N_LIGHTS];
     static Gloom::Shader* s = nullptr; // The currently active shader
     
     // activate the correct shader
@@ -279,26 +288,24 @@ void renderNode(SceneNode* node, Gloom::Shader* parent_shader = default_shader)
         uint i = 0; for (Light l : lights) l.push_to_shader(s, i++);
     }
 
+    switch(node->nodeType) {
+        case GEOMETRY:
+            if(node->vertexArrayObjectID != -1) {
                 // load uniforms
                 glUniformMatrix4fv(s->location("MVP")     , 1, GL_FALSE, glm::value_ptr(node->MVP));
                 glUniformMatrix4fv(s->location("MV")      , 1, GL_FALSE, glm::value_ptr(node->MV));
                 glUniformMatrix4fv(s->location("MVnormal"), 1, GL_FALSE, glm::value_ptr(node->MVnormal));
-    glUniform1ui(s->location("isNormalMapped"), false);
+                glUniform1f( s->location("shinyness"),               node->shinyness);
-    glUniform1ui(s->location("isTextured"), false);
+                glUniform1f( s->location("displacementCoefficient"), node->displacementCoefficient);
-
+                glUniform1ui(s->location("isTextured"),              node->isTextured);
-    switch(node->nodeType) {
+                glUniform1ui(s->location("isNormalMapped"),          node->isNormalMapped);
-        case NORMAL_TEXTURED_GEOMETRY:
+                glUniform1ui(s->location("isDisplacementMapped"),    node->isDisplacementMapped);
-            glUniform1ui(s->location("isNormalMapped"), true);
-            glBindTextureUnit(1, node->normalTextureID);
-            [[fallthrough]];
-        case TEXTURED_GEOMETRY:
-            glUniform1ui(s->location("isTextured"), true);
-            glBindTextureUnit(0, node->diffuseTextureID);
-            [[fallthrough]];
-        case GEOMETRY:
-            if(node->vertexArrayObjectID != -1) {
                 glUniform1ui(s->location("isIlluminated"),           node->isIlluminated);
                 glUniform1ui(s->location("isInverted"),              node->isInverted);
+
+                if (node->isTextured)           glBindTextureUnit(0, node->diffuseTextureID);
+                if (node->isNormalMapped)       glBindTextureUnit(1, node->normalTextureID);
+                if (node->isDisplacementMapped) glBindTextureUnit(2, node->displacementTextureID);
                 glBindVertexArray(node->vertexArrayObjectID);
                 glDrawElements(GL_TRIANGLES, node->VAOIndexCount, GL_UNSIGNED_INT, nullptr);
             }
@@ -309,6 +316,11 @@ void renderNode(SceneNode* node, Gloom::Shader* parent_shader = default_shader)
             lights[id].position          = vec3(node->MV * glm::vec4(node->position, 1.0));
             lights[id].is_spot           = node->nodeType == SPOT_LIGHT;
             lights[id].spot_target       = node->rotation;
+            lights[id].spot_cuttof_angle = node->spot_cuttof_angle;
+            lights[id].attenuation       = node->attenuation;
+            lights[id].color_emissive    = node->color_emissive;
+            lights[id].color_diffuse     = node->color_diffuse;
+            lights[id].color_specular    = node->color_specular;
             lights[id].push_to_shader(s, id);
             break;
         }

src/sceneGraph.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <assert.h>
 #include <chrono>
 #include <cstdio>
 #include <cstdlib>
@@ -22,7 +23,9 @@ using std::vector;
 typedef unsigned int uint;
 
 enum SceneNodeType {
-	GEOMETRY, POINT_LIGHT, SPOT_LIGHT, TEXTURED_GEOMETRY, NORMAL_TEXTURED_GEOMETRY
+	GEOMETRY,
+	POINT_LIGHT,
+	SPOT_LIGHT,
 };
 
 struct SceneNode {
@@ -34,58 +37,84 @@ struct SceneNode {
 		static map<Mesh*, int> cache;
 
 		if (cache.find(mesh) == cache.end())
-			cache[mesh] = generateBuffer(*mesh, nodeType==NORMAL_TEXTURED_GEOMETRY);
+			cache[mesh] = generateBuffer(*mesh, isNormalMapped || isDisplacementMapped);
 
 		vertexArrayObjectID = cache[mesh];
 		VAOIndexCount = mesh->indices.size();
 	}
-	void setTexture(PNGImage* diffuse, PNGImage* normal = nullptr) {
+	void setTexture(PNGImage* diffuse, PNGImage* normal=nullptr, PNGImage* displacement=nullptr) {
 		static map<PNGImage*, int> cache;
+		assert(vertexArrayObjectID==-1);
 
-		if (cache.find(diffuse) == cache.end()) cache[diffuse] = generateTexture(*diffuse);
+		if (diffuse) {
+			if (cache.find(diffuse) == cache.end())
+				cache[diffuse] = generateTexture(*diffuse);
 			diffuseTextureID = cache[diffuse];
-		
+			isTextured = true;
-		if (!normal) return;
-		if (cache.find(normal)  == cache.end()) cache[normal]  = generateTexture(*normal);
-		normalTextureID  = cache[normal];
 		}
 		
+		if (normal) {
+			if (cache.find(normal) == cache.end())
+				cache[normal] = generateTexture(*normal);
+			normalTextureID = cache[normal];
+			isNormalMapped  = true;
+		}
+		
+		if (displacement) {
+			if (cache.find(displacement) == cache.end())
+				cache[displacement] = generateTexture(*displacement);
+			displacementTextureID = cache[displacement];
+			isDisplacementMapped  = true;
+		}
+	}
+	
+	// this node
+	SceneNodeType nodeType;
 	vector<SceneNode*> children;
 
+	// light specific:
+	uint  lightID        = -1;
+	vec3  color_emissive = vec3(0.0);
+	vec3  color_diffuse  = vec3(0.8);
+	vec3  color_specular = vec3(0.5);
+	vec3  attenuation    = vec3(1.0, 0.0, 0.001); // 1 / (x + y*l + z*l*l)
+	float spot_cuttof_angle = glm::radians(1.5); // radians
+	SceneNode* targeted_by  = nullptr; // spot will follow this node
+
 	// The node's position and rotation relative to its parent
 	vec3 position = vec3(0, 0, 0);
-	vec3 rotation = vec3(0, 0, 0);
+	vec3 rotation = vec3(0, 0, 0); // also used as spot-target
 	vec3 scale    = vec3(1, 1, 1);
-
+	vec3 referencePoint = vec3(0, 0, 0); // center of rotation, in model space
-	// set this if the shape uses a custom shader other than the inherited one
-	Gloom::Shader* shader = nullptr;
-	
-	// A transformation matrix representing the transformation of the node's location relative to its parent. This matrix is updated every frame.
-	mat4 MVP; // MVP
-	mat4 MV; // MV
-	mat4 MVnormal; // transpose(inverse(MV))
-
-	// The location of the node's reference point (center of rotation)
-	vec3 referencePoint = vec3(0, 0, 0);
 
 	// VAO IDs refering to a loaded Mesh and its length
 	int vertexArrayObjectID = -1;
 	uint VAOIndexCount = 0;
 
 	// textures
+	float shinyness = 10.0; // specular power
 	uint diffuseTextureID;
 	uint normalTextureID;
+	uint displacementTextureID;
+	float displacementCoefficient = 0.1; // in units
 
 	// shader flags
+	bool isTextured = false;
+	bool isNormalMapped = false;
+	bool isDisplacementMapped = false;
 	bool isIlluminated = true;
 	bool isInverted = false;
 
-	// Node type is used to determine how to handle the contents of a node
+	// rendering
-	SceneNodeType nodeType;
+	Gloom::Shader* shader = nullptr;
+	mat4 MVP; // MVP
+	mat4 MV; // MV
+	mat4 MVnormal; // transpose(inverse(MV))
+
+
+	
+	
 
-	// for lights:
-	uint lightID;
-	SceneNode* targeted_by = nullptr; // spot
 };
 
 // Struct for keeping track of 2D coordinates

src/utilities/glutils.cpp

@@ -64,7 +64,7 @@ void addTangents(uint vaoID, Mesh& mesh) {
         vec2 deltaUV1 = uv2 - uv1;
         vec2 deltaUV2 = uv3 - uv1;
 
-        float f = -1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
+        float f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
         
         vec3 tangent{
             f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x),