Use nullptr instead of 0 for pointers.

src/AbstractShaderProgram.cpp

@@ -86,7 +86,7 @@ void AbstractShaderProgram::link() {
 
     /* Display errors or warnings */
     char message[LINKER_MESSAGE_MAX_LENGTH];
-    glGetProgramInfoLog(program, LINKER_MESSAGE_MAX_LENGTH, 0, message);
+    glGetProgramInfoLog(program, LINKER_MESSAGE_MAX_LENGTH, nullptr, message);
 
     /* Show error log and delete shader */
     if(status == GL_FALSE) {

src/IndexedMesh.cpp

@@ -53,7 +53,7 @@ void IndexedMesh::draw() {
 
     /* Bind index array, draw the elements and unbind */
     _indexBuffer.bind();
-    glDrawElements(primitive(), _indexCount, _indexType, 0);
+    glDrawElements(primitive(), _indexCount, _indexType, nullptr);
     _indexBuffer.unbind();
 
     /* Disable vertex arrays for all attributes */

src/Mesh.cpp

@@ -133,7 +133,7 @@ void Mesh::bindAttribute(Buffer* buffer, GLuint attribute, GLint size, GLenum ty
     a.size = size;
     a.type = type;
     a.stride = 0;
-    a.pointer = 0;
+    a.pointer = nullptr;
 
     found->second.second.push_back(a);
     _attributes.insert(attribute);

src/Shader.cpp

@@ -63,7 +63,7 @@ GLuint Shader::compile() {
 
     /* Create shader and set its source */
     shader = glCreateShader(_type);
-    glShaderSource(shader, 1, _sources, 0);
+    glShaderSource(shader, 1, _sources, nullptr);
 
     /* Compile shader */
     glCompileShader(shader);
@@ -75,7 +75,7 @@ GLuint Shader::compile() {
 
     /* Display errors or warnings */
     char message[COMPILER_MESSAGE_MAX_LENGTH];
-    glGetShaderInfoLog(shader, COMPILER_MESSAGE_MAX_LENGTH, 0, message);
+    glGetShaderInfoLog(shader, COMPILER_MESSAGE_MAX_LENGTH, nullptr, message);
 
     if(status == GL_FALSE || message[0] != 0) {
         Error err;