texture problems with librocket, ogre & ios - c++

Question

We are trying to use librocket http://librocket.com/ together with Ogre http://www.ogre3d.org/. They're both part of gamekit http://code.google.com/p/gamekit/ which I use for this project.
This all works fine together as long as I don't load an image with librocket. As soon as I do that the viewport on the iPad is not fullscreen anymore but small in the lower corner. Like this: http://uploads.undef.ch/machine/ipad.png
I can't make a connection between loading/rendering a texture and resizing of the viewport. And I can't find anything wrong with the RenderInterface. http://uploads.undef.ch/machine/RenderInterfaceOgre3D.cpp
Is there any OpenGLES command that could have an affect on the active viewport size?
This is the relevant code that loads an image and displays it:
// Called by Rocket when a texture is required by the library.
bool RenderInterfaceOgre3D::LoadTexture(Rocket::Core::TextureHandle& texture_handle, Rocket::Core::Vector2i& texture_dimensions, const Rocket::Core::String& source)
{
Ogre::TextureManager* texture_manager = Ogre::TextureManager::getSingletonPtr();
Ogre::TexturePtr ogre_texture = texture_manager->getByName(Ogre::String(source.CString()));
if (ogre_texture.isNull())
{
ogre_texture = texture_manager->load(Ogre::String(source.CString()),
DEFAULT_ROCKET_RESOURCE_GROUP,
Ogre::TEX_TYPE_2D,
0);
}
if (ogre_texture.isNull())
return false;
texture_dimensions.x = ogre_texture->getWidth();
texture_dimensions.y = ogre_texture->getHeight();
texture_handle = reinterpret_cast<Rocket::Core::TextureHandle>(new RocketOgre3DTexture(ogre_texture));
return true;
}
// Called by Rocket when it wants to render geometry that it does not wish to optimise.
void RenderInterfaceOgre3D::RenderGeometry(Rocket::Core::Vertex* vertices, int num_vertices, int* indices, int num_indices, Rocket::Core::TextureHandle texture, const Rocket::Core::Vector2f& translation)
{
// We've chosen to not support non-compiled geometry in the Ogre3D renderer.
// But if you want, you can uncomment this code, so borders will be shown.
/*
Rocket::Core::CompiledGeometryHandle gh = CompileGeometry(vertices, num_vertices, indices, num_indices, texture);
RenderCompiledGeometry(gh, translation);
ReleaseCompiledGeometry(gh);
*/
}
// Called by Rocket when it wants to compile geometry it believes will be static for the forseeable future.
Rocket::Core::CompiledGeometryHandle RenderInterfaceOgre3D::CompileGeometry(Rocket::Core::Vertex* vertices, int num_vertices, int* indices, int num_indices, Rocket::Core::TextureHandle texture)
{
RocketOgre3DCompiledGeometry* geometry = new RocketOgre3DCompiledGeometry();
geometry->texture = texture == NULL ? NULL : (RocketOgre3DTexture*) texture;
geometry->render_operation.vertexData = new Ogre::VertexData();
geometry->render_operation.vertexData->vertexStart = 0;
geometry->render_operation.vertexData->vertexCount = num_vertices;
geometry->render_operation.indexData = new Ogre::IndexData();
geometry->render_operation.indexData->indexStart = 0;
geometry->render_operation.indexData->indexCount = num_indices;
geometry->render_operation.operationType = Ogre::RenderOperation::OT_TRIANGLE_LIST;
// Set up the vertex declaration.
Ogre::VertexDeclaration* vertex_declaration = geometry->render_operation.vertexData->vertexDeclaration;
size_t element_offset = 0;
vertex_declaration->addElement(0, element_offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
element_offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
vertex_declaration->addElement(0, element_offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
element_offset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);
vertex_declaration->addElement(0, element_offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES);
#if GK_PLATFORM == GK_PLATFORM_APPLE_IOS
// Create the vertex buffer.
Ogre::HardwareVertexBufferSharedPtr vertex_buffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(vertex_declaration->getVertexSize(0), num_vertices, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE,true);
geometry->render_operation.vertexData->vertexBufferBinding->setBinding(0, vertex_buffer);
// Fill the vertex buffer.
RocketOgre3DVertex* ogre_vertices = (RocketOgre3DVertex*) vertex_buffer->lock(0, vertex_buffer->getSizeInBytes(), Ogre::HardwareBuffer::HBL_DISCARD);
#else
Ogre::HardwareVertexBufferSharedPtr vertex_buffer = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(vertex_declaration->getVertexSize(0), num_vertices, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
geometry->render_operation.vertexData->vertexBufferBinding->setBinding(0, vertex_buffer);
// Fill the vertex buffer.
RocketOgre3DVertex* ogre_vertices = (RocketOgre3DVertex*) vertex_buffer->lock(0, vertex_buffer->getSizeInBytes(), Ogre::HardwareBuffer::HBL_NORMAL);
#endif
for (int i = 0; i < num_vertices; ++i)
{
ogre_vertices[i].x = vertices[i].position.x;
ogre_vertices[i].y = vertices[i].position.y;
ogre_vertices[i].z = 0;
Ogre::ColourValue diffuse(vertices[i].colour.red / 255.0f, vertices[i].colour.green / 255.0f, vertices[i].colour.blue / 255.0f, vertices[i].colour.alpha / 255.0f);
render_system->convertColourValue(diffuse, &ogre_vertices[i].diffuse);
ogre_vertices[i].u = vertices[i].tex_coord[0];
ogre_vertices[i].v = vertices[i].tex_coord[1];
}
vertex_buffer->unlock();
#if GK_PLATFORM == GK_PLATFORM_APPLE_IOS
// Create the index buffer.
Ogre::HardwareIndexBufferSharedPtr index_buffer = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, num_indices, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
geometry->render_operation.indexData->indexBuffer = index_buffer;
geometry->render_operation.useIndexes = true;
#else
Ogre::HardwareIndexBufferSharedPtr index_buffer = Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(Ogre::HardwareIndexBuffer::IT_32BIT, num_indices, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
geometry->render_operation.indexData->indexBuffer = index_buffer;
geometry->render_operation.useIndexes = true;
#endif
// Fill the index buffer.
unsigned short * ogre_indices = (unsigned short*)index_buffer->lock(0, index_buffer->getSizeInBytes(), Ogre::HardwareBuffer::HBL_NORMAL);
#if GK_PLATFORM == GK_PLATFORM_APPLE_IOS
//unsigned short short_indices[num_indices];
for(int i=0;i<num_indices;i++)
ogre_indices[i] = indices[i];
//memcpy(ogre_indices, short_indices, sizeof(unsigned short) * num_indices);
#else
memcpy(ogre_indices, indices, sizeof(unsigned int) * num_indices);
#endif
index_buffer->unlock();
return reinterpret_cast<Rocket::Core::CompiledGeometryHandle>(geometry);
}
// Called by Rocket when it wants to render application-compiled geometry.
void RenderInterfaceOgre3D::RenderCompiledGeometry(Rocket::Core::CompiledGeometryHandle geometry, const Rocket::Core::Vector2f& translation)
{
Ogre::Matrix4 transform;
transform.makeTrans(translation.x, translation.y, 0);
render_system->_setWorldMatrix(transform);
render_system = Ogre::Root::getSingleton().getRenderSystem();
RocketOgre3DCompiledGeometry* ogre3d_geometry = (RocketOgre3DCompiledGeometry*) geometry;
if (ogre3d_geometry->texture != NULL)
{
render_system->_setTexture(0, true, ogre3d_geometry->texture->texture);
// Ogre can change the blending modes when textures are disabled - so in case the last render had no texture,
// we need to re-specify them.
render_system->_setTextureBlendMode(0, colour_blend_mode);
render_system->_setTextureBlendMode(0, alpha_blend_mode);
}
else
render_system->_disableTextureUnit(0);
render_system->_render(ogre3d_geometry->render_operation);
}