Refine EulerCamera and App::frame_core_draw to get a stereoscopic view

Redefined classes

redef class App

gamnit :: stereoscopic_view $ App

App subclasses are cross-platform applications
redef class EulerCamera

gamnit :: stereoscopic_view $ EulerCamera

Simple camera with perspective oriented with Euler angles (pitch, yaw, roll)
redef class GamnitDisplay

gamnit :: stereoscopic_view $ GamnitDisplay

General display class, is sized and drawable

All class definitions

redef class App

gamnit :: stereoscopic_view $ App

App subclasses are cross-platform applications
redef class EulerCamera

gamnit :: stereoscopic_view $ EulerCamera

Simple camera with perspective oriented with Euler angles (pitch, yaw, roll)
redef class GamnitDisplay

gamnit :: stereoscopic_view $ GamnitDisplay

General display class, is sized and drawable
package_diagram gamnit::stereoscopic_view stereoscopic_view gamnit\>depth\> depth gamnit::stereoscopic_view->gamnit\>depth\> android android gamnit\>depth\>->android gamnit\>flat\> flat gamnit\>depth\>->gamnit\>flat\> gamnit\>model_parsers\> model_parsers gamnit\>depth\>->gamnit\>model_parsers\> ...>android ...gamnit\>flat\> ... ...gamnit\>flat\>->gamnit\>flat\> ...gamnit\>model_parsers\> ... ...gamnit\>model_parsers\>->gamnit\>model_parsers\> gamnit::vr vr gamnit::vr->gamnit::stereoscopic_view a_star-m a_star-m a_star-m->gamnit::vr a_star-m... ... a_star-m...->a_star-m


module abstract_collection

core :: abstract_collection

Abstract collection classes and services.
module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters
module angles

geometry :: angles

Angle related service using Float to represent an angle in radians
module app

app :: app

app.nit is a framework to create cross-platform applications
module app_base

app :: app_base

Base of the app.nit framework, defines App
module array

core :: array

This module introduces the standard array structure.
module assets

app :: assets

Portable services to load resources from the assets folder
module audio

app :: audio

Services to load and play Sound and Music from the assets folder
module aware

android :: aware

Android compatibility module
module bitset

core :: bitset

Services to handle BitSet
module bmfont

gamnit :: bmfont

Parse Angel Code BMFont format and draw text
module boxes

geometry :: boxes

Provides interfaces and classes to represent basic geometry needs.
module bytes

core :: bytes

Services for byte streams and arrays
module c

c :: c

Structures and services for compatibility with the C language
module caching

serialization :: caching

Services for caching serialization engines
module camera_control

gamnit :: camera_control

Simple camera control for user, as the method accept_scroll_and_zoom
module cameras

gamnit :: cameras

Camera services producing Model-View-Projection matrices
module cameras_cache

gamnit :: cameras_cache

Cache the Matrix produced by Camera::mvp_matrix
module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.
module codec_base

core :: codec_base

Base for codecs to use with streams
module codecs

core :: codecs

Group module for all codec-related manipulations
module collection

core :: collection

This module define several collection classes.
module core

core :: core

Standard classes and methods used by default by Nit programs and libraries.
module depth_core

gamnit :: depth_core

Base entities of the depth 3D game framework
module display

gamnit :: display

Abstract display services
module dom

dom :: dom

Easy XML DOM parser
module dynamic_resolution

gamnit :: dynamic_resolution

Virtual screen with a resolution independent from the real screen
module engine_tools

serialization :: engine_tools

Advanced services for serialization engines
module environ

core :: environ

Access to the environment variables of the process
module error

core :: error

Standard error-management infrastructure.
module exec

core :: exec

Invocation and management of operating system sub-processes.
module file

core :: file

File manipulations (create, read, write, etc.)
module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision
module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints
module flat

core :: flat

All the array-based text representations
module flat

gamnit :: flat

Simple API for 2D games, built around Sprite and App::update
module flat_core

gamnit :: flat_core

Core services for the flat API for 2D games
module font

gamnit :: font

Abstract font drawing services, implemented by bmfont and tileset
module gamnit

gamnit :: gamnit

Game and multimedia framework for Nit
module gc

core :: gc

Access to the Nit internal garbage collection mechanism
module geometry

geometry :: geometry

Provides interfaces and classes to represent basic geometry needs.
module glesv2

glesv2 :: glesv2

OpenGL graphics rendering library for embedded systems, version 2.0
module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.
module input

mnit :: input

Defines abstract classes for user and general inputs to the application.
module inspect

serialization :: inspect

Refine Serializable::inspect to show more useful information
module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O
module kernel

core :: kernel

Most basic classes and methods.
module keys

gamnit :: keys

Simple service keeping track of which keys are currently pressed
module limit_fps

gamnit :: limit_fps

Frame-rate control for applications
module list

core :: list

This module handle double linked lists
module math

core :: math

Mathematical operations
module matrix

matrix :: matrix

Services for matrices of Float values
module meta

meta :: meta

Simple user-defined meta-level to manipulate types of instances as object.
module model_dimensions

gamnit :: model_dimensions

Dimensions related services for Model and Mesh
module model_parser_base

gamnit :: model_parser_base

Services to parse models from a text description
module more_collections

more_collections :: more_collections

Highly specific, but useful, collections-related classes.
module more_lights

gamnit :: more_lights

More implementations of Light
module more_materials

gamnit :: more_materials

Various material implementations
module more_meshes

gamnit :: more_meshes

More simple geometric meshes
module more_models

gamnit :: more_models

Services to load models from the assets folder
module mtl

gamnit :: mtl

Services to parse .mtl material files
module native

core :: native

Native structures for text and bytes
module numeric

core :: numeric

Advanced services for Numeric types
module obj

gamnit :: obj

Services to parse .obj geometry files
module parser

dom :: parser

XML DOM-parsing facilities
module parser_base

parser_base :: parser_base

Simple base for hand-made parsers of all kinds
module particles

gamnit :: particles

Particle effects
module performance_analysis

performance_analysis :: performance_analysis

Services to gather information on the performance of events by categories
module points_and_lines

geometry :: points_and_lines

Interfaces and classes to represent basic geometry needs.
module poset

poset :: poset

Pre order sets and partial order set (ie hierarchies)
module programs

gamnit :: programs

Services for graphical programs with shaders, attributes and uniforms
module projection

matrix :: projection

Services on Matrix to transform and project 3D coordinates
module protocol

core :: protocol

module queue

core :: queue

Queuing data structures and wrappers
module range

core :: range

Module for range of discrete objects.
module re

core :: re

Regular expression support for all services based on Pattern
module realtime

realtime :: realtime

Services to keep time of the wall clock time
module ropes

core :: ropes

Tree-based representation of a String.
module selection

gamnit :: selection

Select Actor from a screen coordinate
module serialization

serialization :: serialization

General serialization services
module serialization_core

serialization :: serialization_core

Abstract services to serialize Nit objects to different formats
module shadow

gamnit :: shadow

Shadow mapping using a depth texture
module sorter

core :: sorter

This module contains classes used to compare things and sorts arrays.
module stream

core :: stream

Input and output streams of characters
module text

core :: text

All the classes and methods related to the manipulation of text entities
module textures

gamnit :: textures

Load textures, create subtextures and manage their life-cycle
module tileset

gamnit :: tileset

Support for TileSet, TileSetFont and drawing text with TextSprites
module time

core :: time

Management of time and dates
module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure
module utf8

core :: utf8

Codec for UTF-8 I/O
module xml_entities

dom :: xml_entities

Basic blocks for DOM-XML representation


module depth

gamnit :: depth

Framework for 3D games in Nit


module vr

gamnit :: vr

VR support for gamnit depth, for Android only


module a_star-m


# Refine `EulerCamera` and `App::frame_core_draw` to get a stereoscopic view
module stereoscopic_view

import depth
intrude import cameras

redef class EulerCamera
	redef var mvp_matrix = new Matrix.identity(4)

	# Half of the distance between the eyes
	var eye_separation: Float = 0.03125

	# MVP matrix for the left eye
	fun mvp_matrix_left: Matrix do return mvp_matrix_eye(eye_separation)

	# MVP matrix for the right eye
	fun mvp_matrix_right: Matrix do return mvp_matrix_eye(-eye_separation)

	# Get an MVP matrix for an eye at `diff` world unit from the center
	private fun mvp_matrix_eye(diff: Float): Matrix
		var view = new Matrix.identity(4)

		# Translate the world away from the camera
		view.translate(-position.x/2.0, -position.y/2.0, -position.z/2.0)

		# Rotate the camera, first by looking left or right, then up or down
		view = view * rotation_matrix

		# Apply eye transformation
		var translation = new Matrix.identity(4)
		translation.translate(diff, 0.0, 0.0)
		view = view * translation

		# Use a projection matrix with a depth
		var projection = new Matrix.perspective(pi*field_of_view_y/2.0,
			display.aspect_ratio, near, far)

		return view * projection

redef class GamnitDisplay

	# With stereoscopic view, the aspect ratio (in each eye) is half of the screen
	redef fun aspect_ratio do return super / 2.0

redef class App
	redef fun frame_core_draw(display) do frame_core_stereoscopic display

	# Split the screen in two, and call `frame_core_depth` for each eyes
	protected fun frame_core_stereoscopic(display: GamnitDisplay)
		var half_width = display.width / 2

		# Left eye
		glViewport(0, 0, half_width, display.height)
		world_camera.mvp_matrix = world_camera.mvp_matrix_left
		frame_core_depth display

		# Right eye
		glViewport(half_width, 0, half_width, display.height)
		world_camera.mvp_matrix = world_camera.mvp_matrix_right
		frame_core_depth display

		# We reset the viewport for selection
		glViewport(0, 0, display.width, display.height)

		# Check for errors
		var gl_error = glGetError
		assert gl_error == gl_NO_ERROR else print gl_error