multiple textures and normal maps

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 +43,11 @@ 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
+
 # Reihe 1 #
 
 # Platz 1 #
@@ -1677,3 +1683,10 @@ 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/fragmentShader.glsl

@@ -16,6 +16,11 @@ uniform float lightBrightness[2];
 uniform vec4 lightColor;
 
 uniform sampler2D textureSampler;
+
+uniform bool useSecondaryTexture;
+uniform bool useNormalMap;
+
+uniform sampler2D secondaryTexture;
 uniform sampler2D normalMap;
 
 
@@ -25,13 +30,29 @@ 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 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];
 

src/main.c

@@ -154,10 +154,29 @@ 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);
 }

src/sceneGraph.c

@@ -19,6 +19,8 @@
 
 #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_USE_MODEL "use"
 #define KEYWORD_DEFINE_PARENT "parent"
@@ -99,7 +101,7 @@ 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 +198,10 @@ 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;
             continue;
         }
         if (strcmp(keyword, KEYWORD_DEFINE_OBJ_FILE) == 0) {
@@ -208,6 +214,16 @@ 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_NODE) == 0) {

src/sceneGraph.h

@@ -14,6 +14,8 @@ typedef struct SceneNode SceneNode;
 typedef struct {
     ObjectData* objectData;
     GLuint texture;
+    GLuint secondaryTexture;
+    GLuint normalMap;
 } Model;
 
 struct SceneNode {