Merge branch 'multiple-lights'

README.md

@@ -24,7 +24,11 @@ $ make run
 Bedienung über Keyboard :D
  - WASD
  - R & F für Hoch & Runter
- - 1,2,3,4,5 für Verschiedene Kamerapositionen
+ - 1,2,3,4,5,6 für Verschiedene Kamerapositionen
+    - 1: Vor den Tafeln
+    - 2-4: Verschiedene Sitzplätze
+    - 5: Vogelperspektive
+    - 6: Close-Up vom Normal Map Demo Cube
 
 
 ## TODO LIST

obj/cube/cube.obj

@@ -0,0 +1,45 @@
+# Blender v3.0.1 OBJ File: ''
+# www.blender.org
+o Cube_Cube.001
+v -1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 -1.000000
+v 1.000000 -1.000000 1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 -1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 0.000000
+vt 0.000000 1.000000
+vn -1.0000 0.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn 1.0000 0.0000 0.0000
+vn 0.0000 0.0000 1.0000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 1.0000 0.0000
+usemtl None
+s off
+f 1/1/1 2/2/1 4/3/1 3/4/1
+f 3/5/2 4/6/2 8/7/2 7/8/2
+f 7/9/3 8/10/3 6/11/3 5/12/3
+f 5/13/4 6/14/4 2/15/4 1/16/4
+f 3/5/5 7/17/5 5/18/5 1/16/5
+f 8/19/6 4/6/6 2/15/6 6/20/6

scene-graph.scg

@@ -9,6 +9,7 @@ texture ../texture/chair/chair_texture.png
 model 2
 file ../obj/chalkboard/Chalkboard.obj
 texture ../texture/chalkboard/Chalkboard.jpg
+texture2 ../texture/chalkboard/text.png
 
 model 3
 file ../obj/chalkboard/ChalkboardPoles.obj
@@ -42,6 +43,12 @@ model 10
 file ../obj/floor/Floor2.obj
 texture ../texture/floor/Carpet.png
 
+model 11
+file ../obj/cube/cube.obj
+texture ../texture/crate/texture.jpg
+normal ../texture/crate/normal.jpg
+shininess 100
+
 # Reihe 1 #
 
 # Platz 1 #
@@ -1686,3 +1693,10 @@ rotateY 3.14159
 rotateZ 0.0
 translate 6.0 -0.8 -6.0
 parent 0
+
+# Normal Map Crate
+obj 1000
+use 11
+name normalMapCrate
+scale 0.5 0.5 0.5
+translate 3.0 0.0 3.0

src/Makefile

@@ -15,7 +15,7 @@ test.out: test.o $(OBJ)
 	gcc -o $@ test.o $(OBJ) $(ALL_LIBS)
 
 %Shader.c: %Shader.glsl
-	xxd -i $? > $@
+	xxd -i $? | tac | sed "3s/$$/, 0x00/" | tac > $@
 
 main.o: $(SHADERS) matrixMath.h transformation.h wavefrontobj.h sceneGraph.h objectHandler.h shader.h
 

src/fragmentShader.glsl

@@ -10,10 +10,17 @@ flat in mat3 TBN;
 uniform float shininess;
 
 uniform vec4 ambientLight;
-uniform vec3 lightPosition;
+uniform vec3 lightPositions[2];
+uniform float lightBrightness[2];
+
 uniform vec4 lightColor;
 
 uniform sampler2D textureSampler;
+
+uniform bool useSecondaryTexture;
+uniform bool useNormalMap;
+
+uniform sampler2D secondaryTexture;
 uniform sampler2D normalMap;
 
 
@@ -23,16 +30,35 @@ float emissionStrength = 0.0;
 void main() {
 	vec4 color = vec4(texture(textureSampler, textureCoordinate).rgb, 1.0);
 
-	vec3 norm = normalize(normal);
+	if (useSecondaryTexture) {
+		vec4 secondColor = texture(secondaryTexture, textureCoordinate).rgba;
+		color = vec4(color.rgb * (1 - secondColor.a) + secondColor.rgb * secondColor.a, min(color.a + secondColor.a, 1.0));
+	}
 
-	vec3 lightDir = normalize(lightPosition - fragmentPosition);
+	vec3 norm;
 	vec3 eyeDir = (-normalize(fragmentPosition));
+	if (useNormalMap) {
+		norm = normalize((texture(normalMap, textureCoordinate).xyz * 2 - vec3(1,1,1)));
+		eyeDir = TBN * eyeDir;
+	} else {
+		norm = normalize(normal);
+	}
 
-	float diff = max(dot(norm, lightDir), 0.0);
+	float sumDiffusion = 0;
+	float sumSpecular = 0;
+
+	for (int i = 0; i < lightPositions.length(); i++) {
+		vec3 lightDir = normalize(lightPositions[i] - fragmentPosition);
+
+		if (useNormalMap) {
+			lightDir = TBN * lightDir;
+		}
+
+		sumDiffusion += max(dot(norm, lightDir), 0.0) * lightBrightness[i];
 
 		vec3 halfway = (lightDir + eyeDir) / length(lightDir + eyeDir);
-	float specular = pow(max(dot(halfway, norm), 0.0), shininess);
-
+		sumSpecular += pow(max(dot(halfway, norm), 0.0), shininess);
+	}
 
 	gl_FragColor =
 		// EMISSION
@@ -42,8 +68,8 @@ void main() {
 		ambientLight * color +
 
 		// DIFFUSION
-		color * diff +
+		color * sumDiffusion +
 
 		// SPECULAR
-		specular * lightColor * color;
+		sumSpecular * lightColor * color;
 }

src/main.c

@@ -45,14 +45,36 @@ int framesSinceUpdate = 0;
 GLfloat step = 0.0f;
 const GLfloat pi = 3.14159f;
 
-vec3 cameraPosition = {0.0f, 3.0f, 5.5f};
+vec3 cameraPosition = {0.0f, 2.0f, 1.0f};
 vec3 objectPosition = {0.0f, 0.0f, 0.0f};
+
+vec3 cameraTravelPosition = {0.0f, 3.0f, 5.5f};
+bool cameraTraveling = true;
+
 GLfloat radius = 1.0f;
 mat4 viewingTransformation;
 
 // Define a global scene graph root node
 SceneNode* rootNode;
 
+void handleCameraTravel() {
+    if (cameraTraveling) {
+        vec3 delta;
+
+        vec3Subtract(&delta, &cameraTravelPosition, &cameraPosition);
+
+        if (vec3Length(&delta) < 0.0001) cameraTraveling = false;
+
+        vec3Multiply(&delta, &delta, 0.1);
+        vec3Add(&cameraPosition, &cameraPosition, &delta);
+    }
+}
+
+void travelCamera(vec3 newPosition) {
+    cameraTravelPosition = newPosition;
+    cameraTraveling = true;
+}
+
 /**
  * Input handler for camera movement.
  *  */ 
@@ -61,20 +83,24 @@ void handleInputs(double deltaTime) {
     assert(window != NULL);
 
     if (glfwGetKey(window, GLFW_KEY_1) == GLFW_PRESS) {
-        cameraPosition = (vec3){0.0f, 1.7f, 2.4f};
+        travelCamera((vec3){0.0f, 1.7f, 2.4f});
     }
     if (glfwGetKey(window, GLFW_KEY_2) == GLFW_PRESS) {
-        cameraPosition = (vec3){3.3f, 3.4f, -11.0f};
+        travelCamera((vec3){3.3f, 3.4f, -11.0f});
     }
     if (glfwGetKey(window, GLFW_KEY_3) == GLFW_PRESS) {
-        cameraPosition = (vec3){-3.0f, 2.9f, -7.5f};
+        travelCamera((vec3){-3.0f, 2.9f, -7.5f});
     }
     if (glfwGetKey(window, GLFW_KEY_4) == GLFW_PRESS) {
-        cameraPosition = (vec3){-0.6f, 2.1f, -4.5f};
+        travelCamera((vec3){-0.6f, 2.1f, -4.5f});
     }
     if (glfwGetKey(window, GLFW_KEY_5) == GLFW_PRESS) {
-        cameraPosition = (vec3){-10.6f, 22.1f, -4.5f};
+        travelCamera((vec3){-10.6f, 22.1f, -4.5f});
     }
+    if (glfwGetKey(window, GLFW_KEY_6) == GLFW_PRESS) {
+        travelCamera((vec3){3.574698f, 0.966039f, 3.852249f});
+    }
+    if (!cameraTraveling) {
         if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
             cameraPosition.z += deltaTime * 10;
         }
@@ -93,6 +119,7 @@ void handleInputs(double deltaTime) {
         if (glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS) {
             cameraPosition.y -= deltaTime * 10;
         }
+    }
 
     SceneNode* chalkboard = findNodeByName("myChalkboard1", rootNode);
     if (!chalkboard) return;
@@ -166,7 +193,7 @@ void renderNode(SceneNode* node) {
     glUniformMatrix3fv(glGetUniformLocation(program, "normalModelView"), 1, GL_FALSE, (GLfloat*)&normalModelView);
 
     // SET MATERIAL DATA
-    glUniform1f(glGetUniformLocation(program, "shininess"), 60.0f * 4.0f);
+    glUniform1f(glGetUniformLocation(program, "shininess"), node->model->shininess * 4.0f);
 
 
     // BIND TEXTURES
@@ -176,10 +203,29 @@ void renderNode(SceneNode* node) {
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, node->model->texture);
 
-    // textureLocation = glGetUniformLocation(program, "normalMap");
-    // glUniform1i(textureLocation, 4);
-    // glActiveTexture(GL_TEXTURE4);
-    // glBindTexture(GL_TEXTURE_2D, textures[NORMAL]);
+    if (node->model->secondaryTexture != -1) {
+
+        glUniform1i(glGetUniformLocation(program, "useSecondaryTexture"), 1);
+
+        glUniform1i(glGetUniformLocation(program, "secondaryTexture"), 1);
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, node->model->secondaryTexture);
+
+    } else {
+        glUniform1i(glGetUniformLocation(program, "useSecondaryTexture"), 0);
+    }
+
+    if (node->model->normalMap != -1) {
+
+        glUniform1i(glGetUniformLocation(program, "useNormalMap"), 1);
+
+        glUniform1i(glGetUniformLocation(program, "normalMap"), 2);
+        glActiveTexture(GL_TEXTURE2);
+        glBindTexture(GL_TEXTURE_2D, node->model->normalMap);
+
+    } else {
+        glUniform1i(glGetUniformLocation(program, "useNormalMap"), 0);
+    }
 
     draw_object(node->model->objectData);
 }
@@ -251,7 +297,7 @@ void init(void) {
 
 void updateStats() {
     printf("\rFPS: %.1f", framesSinceUpdate / timeSinceUpdate);
-    printf(" - Camera Position: [%f, %f, %f]", cameraPosition.x, cameraPosition.y, cameraPosition.z);
+    printf(" - Camera Position: [%f, %f, %f] - Traveling: %s   ", cameraPosition.x, cameraPosition.y, cameraPosition.z, cameraTraveling ? "true" : "false");
     fflush(stdout);
 }
 
@@ -260,6 +306,8 @@ void updateStats() {
  */
 void draw(void) {
 
+    handleCameraTravel();
+
     // FPS Counter
     framesSinceUpdate++;
     double deltaTime = glfwGetTime();
@@ -302,7 +350,7 @@ void draw(void) {
     // -------------- PROJECTION TRANSFORMATION ----------------
     mat4 projectionTransformation;
     GLfloat near = 0.1f;
-    GLfloat far = 20.0f;
+    GLfloat far = 40.0f;
     perspectiveProjection(&projectionTransformation, near, far);
 
     // -------------- NORMALISATION TRANSFORMATION -------------
@@ -318,13 +366,17 @@ void draw(void) {
     glUniformMatrix4fv(glGetUniformLocation(program, "projection"), 1, GL_FALSE, (GLfloat*)&projection);
 
     // SET LIGHT DATA
-    glUniform4f(glGetUniformLocation(program, "lightColor"), 1.0f, 1.0f, 1.0f, 1.0f);
+    glUniform4f(glGetUniformLocation(program, "lightColor"), 0.2f, 0.2f, 0.2f, 0.5f);
     glUniform4f(glGetUniformLocation(program, "ambientLight"), 0.05f, 0.05f, 0.05f, 1.0f);
 
     vec4 lightPosition = {cos(stepi) * 5.0f, 5.0f, sin(stepi) * 5.0f, 1.0f};
     multiplyAny((GLfloat*)&lightPosition, (GLfloat*)&viewingTransformation, (GLfloat*)&lightPosition, 4, 4, 1);
 
-    glUniform3f(glGetUniformLocation(program, "lightPosition"), lightPosition.x, lightPosition.y, lightPosition.z);
+    glUniform3f(glGetUniformLocation(program, "lightPositions[0]"), lightPosition.x, lightPosition.y, lightPosition.z);
+    glUniform3f(glGetUniformLocation(program, "lightPositions[1]"), -lightPosition.x, lightPosition.y, -lightPosition.z);
+
+    glUniform1f(glGetUniformLocation(program, "lightBrightness[0]"), 0.5f);
+    glUniform1f(glGetUniformLocation(program, "lightBrightness[1]"), 0.5f);
 
 
     renderSceneNode(rootNode);

src/sceneGraph.c

@@ -19,6 +19,9 @@
 
 #define KEYWORD_DEFINE_OBJ_FILE "file"
 #define KEYWORD_DEFINE_TEXTURE_FILE "texture"
+#define KEYWORD_DEFINE_SECONDARY_TEXTURE_FILE "texture2"
+#define KEYWORD_DEFINE_NORMAL_MAP_FILE "normal"
+#define KEYWORD_DEFINE_SHININESS "shininess"
 
 #define KEYWORD_USE_MODEL "use"
 #define KEYWORD_DEFINE_PARENT "parent"
@@ -99,7 +102,7 @@ void loadTexture(char* textureFile, GLuint* texture) {
     glBindTexture(GL_TEXTURE_2D, *texture);
 
     printf("%s - %d\n", textureFile, nrChannels);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, image);
+    glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, image);
     // load texture using previously determined format ----- ^^^^^^
 
     glGenerateMipmap(GL_TEXTURE_2D);
@@ -196,6 +199,11 @@ SceneNode* loadSceneGraphFromFile(char* path) {
 
         if (strcmp(keyword, KEYWORD_DEFINE_MODEL) == 0) {
             sscanf(buf, KEYWORD_DEFINE_MODEL " %d", &currentModel);
+            models[currentModel].objectData = NULL;
+            models[currentModel].texture = -1;
+            models[currentModel].secondaryTexture = -1;
+            models[currentModel].normalMap = -1;
+            models[currentModel].shininess = 10.0f;
             continue;
         }
         if (strcmp(keyword, KEYWORD_DEFINE_OBJ_FILE) == 0) {
@@ -208,6 +216,20 @@ SceneNode* loadSceneGraphFromFile(char* path) {
             loadTexture(filepathBuffer, &models[currentModel].texture);
             continue;
         }
+        if (strcmp(keyword, KEYWORD_DEFINE_SECONDARY_TEXTURE_FILE) == 0) {
+            sscanf(buf, KEYWORD_DEFINE_SECONDARY_TEXTURE_FILE " %s", filepathBuffer);
+            loadTexture(filepathBuffer, &models[currentModel].secondaryTexture);
+            continue;
+        }
+        if (strcmp(keyword, KEYWORD_DEFINE_NORMAL_MAP_FILE) == 0) {
+            sscanf(buf, KEYWORD_DEFINE_NORMAL_MAP_FILE " %s", filepathBuffer);
+            loadTexture(filepathBuffer, &models[currentModel].normalMap);
+            continue;
+        }
+        if (strcmp(keyword, KEYWORD_DEFINE_SHININESS) == 0) {
+            sscanf(buf, KEYWORD_DEFINE_SHININESS " %f", &models[currentModel].shininess);
+            continue;
+        }
 
 
         if (strcmp(keyword, KEYWORD_DEFINE_NODE) == 0) {

src/sceneGraph.h

@@ -14,6 +14,9 @@ typedef struct SceneNode SceneNode;
 typedef struct {
     ObjectData* objectData;
     GLuint texture;
+    GLuint secondaryTexture;
+    GLuint normalMap;
+    GLfloat shininess;
 } Model;
 
 struct SceneNode {