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+/*******************************************************************************************************************************************
+
+ @File OGLES2HelloAPI_OSX.mm
+
+ @Title OpenGL ES 2.0 HelloAPI Tutorial
+
+ @Version
+
+ @Copyright Copyright (c) Imagination Technologies Limited.
+
+ @Platform
+
+ @Description Basic Tutorial that shows step-by-step how to initialize OpenGL ES 2.0, use it for drawing a triangle and terminate it.
+ Entry Point: main
+
+ *******************************************************************************************************************************************/
+/*******************************************************************************************************************************************
+ Include Files
+ *******************************************************************************************************************************************/
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+#import <AppKit/NSApplication.h>
+#import <AppKit/NSWindow.h>
+#import <AppKit/NSScreen.h>
+#import <AppKit/NSView.h>
+
+/*******************************************************************************************************************************************
+ Defines
+ *******************************************************************************************************************************************/
+// Index to bind the attributes to vertex shaders
+#define VERTEX_ARRAY 0
+#define KFPS 120.0
+
+// Width and height of the window
+#define WIDTH 800
+#define HEIGHT 600
+
+/*!*****************************************************************************************************************************************
+ Class AppController
+ *******************************************************************************************************************************************/
+@class AppController;
+
+@interface AppController : NSObject <NSApplicationDelegate>
+{
+@private
+ NSTimer* m_timer; // timer for rendering our OpenGL content
+ NSWindow* m_window; // Our window
+ NSView* m_view; // Our view
+
+ // Shaders
+ GLuint m_fragShader;
+ GLuint m_vertexShader;
+ GLuint m_program;
+
+ // Vertex buffer objects
+ GLuint m_vertexBuffer;
+
+ // EGL variables
+ EGLDisplay m_Display;
+ EGLSurface m_Surface;
+ EGLContext m_Context;
+}
+@end
+
+@implementation AppController
+
+/*!*****************************************************************************************************************************************
+ @Function testGLError
+ @Input functionLastCalled Function which triggered the error
+ @Return True if no GL error was detected
+ @Description Tests for an GL error and prints it in a message box.
+ *******************************************************************************************************************************************/
+- (BOOL) testGLError:(const char *)functionLastCalled
+{
+ /* glGetError returns the last error that occurred using OpenGL ES, not necessarily the status of the last called function. The user
+ has to check after every single OpenGL ES call or at least once every frame. Usually this would be for debugging only, but for this
+ example it is enabled always
+ */
+ GLenum lastError = glGetError();
+ if (lastError != GL_NO_ERROR)
+ {
+ NSLog(@"%s failed (%x).\n", functionLastCalled, lastError);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function testEGLError
+ @Input functionLastCalled Function which triggered the error
+ @Return True if no EGL error was detected
+ @Description Tests for an EGL error and prints it.
+ *******************************************************************************************************************************************/
+- (BOOL) testEGLError:(const char *)functionLastCalled
+{
+ /* eglGetError returns the last error that occurred using EGL, not necessarily the status of the last called function. The user has to
+ check after every single EGL call or at least once every frame. Usually this would be for debugging only, but for this example
+ it is enabled always.
+ */
+ EGLint lastError = eglGetError();
+ if (lastError != EGL_SUCCESS)
+ {
+ NSLog(@"%s failed (%x).\n", functionLastCalled, lastError);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function createEGLDisplay
+ @Output eglDisplay EGLDisplay created
+ @Return Whether the function succeeded or not.
+ @Description Creates an EGLDisplay and initialises it.
+ *******************************************************************************************************************************************/
+- (BOOL) createEGLDisplay:(EGLDisplay &)eglDisplay
+{
+ /* Get an EGL display.
+ EGL uses the concept of a "display" which in most environments corresponds to a single physical screen. After creating a native
+ display for a given windowing system, EGL can use this handle to get a corresponding EGLDisplay handle to it for use in rendering.
+ Should this fail, EGL is usually able to provide access to a default display. For Null window systems, there is no display so NULL
+ is passed the this function.
+ */
+ eglDisplay = eglGetDisplay((EGLNativeDisplayType)0);
+ if (eglDisplay == EGL_NO_DISPLAY)
+ {
+ printf("Failed to get an EGLDisplay");
+ return FALSE;
+ }
+
+ /* Initialize EGL.
+ EGL has to be initialized with the display obtained in the previous step. All EGL functions other than eglGetDisplay
+ and eglGetError need an initialised EGLDisplay.
+ If an application is not interested in the EGL version number it can just pass NULL for the second and third parameters, but they
+ are queried here for illustration purposes.
+ */
+ EGLint eglMajorVersion, eglMinorVersion;
+ if (!eglInitialize(eglDisplay, &eglMajorVersion, &eglMinorVersion))
+ {
+ printf("Failed to initialise the EGLDisplay");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function chooseEGLConfig
+ @Output eglConfig The EGLConfig chosen by the function
+ @Input eglDisplay The EGLDisplay used by the application
+ @Return Whether the function succeeded or not.
+ @Description Chooses an appropriate EGLConfig and return it.
+ *******************************************************************************************************************************************/
+- (BOOL) chooseEGLConfig:(EGLConfig &)eglConfig fromDisplay:(EGLDisplay)eglDisplay
+{
+ /* Specify the required configuration attributes.
+ An EGL "configuration" describes the capabilities an application requires and the type of surfaces that can be used for drawing.
+ Each implementation exposes a number of different configurations, and an application needs to describe to EGL what capabilities it
+ requires so that an appropriate one can be chosen. The first step in doing this is to create an attribute list, which is an array
+ of key/value pairs which describe particular capabilities requested. In this application nothing special is required so we can query
+ the minimum of needing it to render to a window, and being OpenGL ES 2.0 capable.
+ */
+ const EGLint configurationAttributes[] =
+ {
+ EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+ EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+ EGL_NONE
+ };
+
+ /* Find a suitable EGLConfig
+ eglChooseConfig is provided by EGL to provide an easy way to select an appropriate configuration. It takes in the capabilities
+ specified in the attribute list, and returns a list of available configurations that match or exceed the capabilities requested.
+ Details of all the possible attributes and how they are selected for by this function are available in the EGL reference pages here:
+ http://www.khronos.org/registry/egl/sdk/docs/man/xhtml/eglChooseConfig.html
+ It is also possible to simply get the entire list of configurations and use a custom algorithm to choose a suitable one, as many
+ advanced applications choose to do. For this application however, taking the first EGLConfig that the function returns suits
+ its needs perfectly, so we limit it to returning a single EGLConfig.
+ */
+ EGLint configsReturned;
+ if (!eglChooseConfig(eglDisplay, configurationAttributes, &eglConfig, 1, &configsReturned) || (configsReturned != 1))
+ {
+ printf("Failed to choose a suitable config.");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function createEGLSurface
+ @Output eglSurface The EGLSurface created
+ @Input eglDisplay The EGLDisplay used by the application
+ @Input eglConfig An EGLConfig chosen by the application
+ @Input view The NSView to render to
+ @Return Whether the function succeeds or not.
+ @Description Creates an EGLSurface for the screen
+ *******************************************************************************************************************************************/
+- (BOOL) createEGLSurface:(EGLSurface &)eglSurface fromDisplay:(EGLDisplay)eglDisplay withConfig:(EGLConfig)eglConfig
+ withView:(NSView *)view
+{
+ /* Create an EGLSurface for rendering.
+ Using a native window created earlier and a suitable eglConfig, a surface is created that can be used to render OpenGL ES calls to.
+ There are three main surface types in EGL, which can all be used in the same way once created but work slightly differently:
+ - Window Surfaces - These are created from a native window and are drawn to the screen.
+ - Pixmap Surfaces - These are created from a native windowing system as well, but are offscreen and are not displayed to the user.
+ - PBuffer Surfaces - These are created directly within EGL, and like Pixmap Surfaces are offscreen and thus not displayed.
+ The offscreen surfaces are useful for non-rendering contexts and in certain other scenarios, but for most applications the main
+ surface used will be a window surface as performed below. For NULL window systems, there are no actual windows, so NULL is passed
+ to this function.
+ */
+ eglSurface = eglCreateWindowSurface(eglDisplay, eglConfig, (EGLNativeWindowType)view, NULL);
+ if (![self testEGLError:"eglCreateWindowSurface"])
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function setupEGLContext
+ @Output eglContext The EGLContext created by this function
+ @Input eglDisplay The EGLDisplay used by the application
+ @Input eglConfig An EGLConfig chosen by the application
+ @Input eglSurface The EGLSurface created by the application
+ @Return Whether the function succeeds or not.
+ @Description Sets up the EGLContext, creating it and then installing it to the current thread.
+ *******************************************************************************************************************************************/
+- (BOOL) setupEGLContext:(EGLContext &)eglContext fromDisplay:(EGLDisplay)eglDisplay withConfig:(EGLConfig)eglConfig
+ withSurface:(EGLSurface)eglSurface
+{
+ /* Make OpenGL ES the current API.
+ EGL needs a way to know that any subsequent EGL calls are going to be affecting OpenGL ES,
+ rather than any other API (such as OpenVG).
+ */
+ eglBindAPI(EGL_OPENGL_ES_API);
+ if (![self testEGLError:"eglBindAPI"])
+ {
+ return FALSE;
+ }
+
+ /* Create a context.
+ EGL has to create what is known as a context for OpenGL ES. The concept of a context is OpenGL ES's way of encapsulating any
+ resources and state. What appear to be "global" functions in OpenGL actually only operate on the current context. A context
+ is required for any operations in OpenGL ES.
+ Similar to an EGLConfig, a context takes in a list of attributes specifying some of its capabilities. However in most cases this
+ is limited to just requiring the version of the OpenGL ES context required - In this case, OpenGL ES 2.0.
+ */
+ EGLint contextAttributes[] =
+ {
+ EGL_CONTEXT_CLIENT_VERSION, 2,
+ EGL_NONE
+ };
+
+ // Create the context with the context attributes supplied
+ eglContext = eglCreateContext(eglDisplay, eglConfig, NULL, contextAttributes);
+ if (![self testEGLError:"eglCreateContext"])
+ {
+ return FALSE;
+ }
+
+ /* Bind the context to the current thread.
+ Due to the way OpenGL uses global functions, contexts need to be made current so that any function call can operate on the correct
+ context. Specifically, make current will bind the context to the thread it's called from, and unbind it from any others. To use
+ multiple contexts at the same time, users should use multiple threads and synchronise between them.
+ */
+ eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
+ if (![self testEGLError:"eglMakeCurrent"])
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function initialiseBuffer
+ @Output vertexBuffer Handle to a vertex buffer object
+ @Return Whether the function succeeds or not.
+ @Description Initialises shaders, buffers and other state required to begin rendering with OpenGL ES
+ *******************************************************************************************************************************************/
+- (BOOL) initialiseBuffer:(GLuint &)vertexBuffer
+{
+ /* Concept: Vertices
+ When rendering a polygon or model to screen, OpenGL ES has to be told where to draw the object, and more fundamentally what shape
+ it is. The data used to do this is referred to as vertices, points in 3D space which are usually collected into groups of three
+ to render as triangles. Fundamentally, any advanced 3D shape in OpenGL ES is constructed from a series of these vertices - each
+ vertex representing one corner of a polygon.
+ */
+
+ /* Concept: Buffer Objects
+ To operate on any data, OpenGL first needs to be able to access it. The GPU maintains a separate pool of memory it uses independent
+ of the CPU. Whilst on many embedded systems these are in the same physical memory, the distinction exists so that they can use and
+ allocate memory without having to worry about synchronising with any other processors in the device.
+ To this end, data needs to be uploaded into buffers, which are essentially a reserved bit of memory for the GPU to use. By creating
+ a buffer and giving it some data we can tell the GPU how to render a triangle.
+ */
+
+ // Vertex data containing the positions of each point of the triangle
+ GLfloat vertexData[] = {-0.4f,-0.4f, 0.0f, // Bottom Left
+ 0.4f,-0.4f, 0.0f, // Bottom Right
+ 0.0f, 0.4f, 0.0f}; // Top Middle
+
+ // Generate a buffer object
+ glGenBuffers(1, &vertexBuffer);
+
+ // Bind buffer as an vertex buffer so we can fill it with data
+ glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
+
+ /* Set the buffer's size, data and usage
+ Note the last argument - GL_STATIC_DRAW. This tells the driver that we intend to read from the buffer on the GPU, and don't intend
+ to modify the data until we're done with it.
+ */
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
+
+ if (![self testGLError:"glBufferData"])
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function initialiseShaders
+ @Output fragmentShader Handle to a fragment shader
+ @Output vertexShader Handle to a vertex shader
+ @Output shaderProgram Handle to a shader program containing the fragment and vertex shader
+ @Return Whether the function succeeds or not.
+ @Description Initialises shaders, buffers and other state required to begin rendering with OpenGL ES
+ *******************************************************************************************************************************************/
+-(BOOL) initialiseFragmentShader:(GLuint &)fragmentShader andVertexShader:(GLuint &)vertexShader withProgram:(GLuint &)shaderProgram
+{
+ /* Concept: Shaders
+ OpenGL ES 2.0 uses what are known as shaders to determine how to draw objects on the screen. Instead of the fixed function
+ pipeline in early OpenGL or OpenGL ES 1.x, users can now programmatically define how vertices are transformed on screen, what
+ data is used where, and how each pixel on the screen is coloured.
+ These shaders are written in GL Shading Language ES: http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf
+ which is usually abbreviated to simply "GLSL ES".
+ Each shader is compiled on-device and then linked into a shader program, which combines a vertex and fragment shader into a form
+ that the OpenGL ES implementation can execute.
+ */
+
+ /* Concept: Fragment Shaders
+ In a final buffer of image data, each individual point is referred to as a pixel. Fragment shaders are the part of the pipeline
+ which determine how these final pixels are coloured when drawn to the framebuffer. When data is passed through here, the positions
+ of these pixels is already set, all that's left to do is set the final colour based on any defined inputs.
+ The reason these are called "fragment" shaders instead of "pixel" shaders is due to a small technical difference between the two
+ concepts. When you colour a fragment, it may not be the final colour which ends up on screen. This is particularly true when
+ performing blending, where multiple fragments can contribute to the final pixel colour.
+ */
+ const char* const fragmentShaderSource = "\
+ void main (void)\
+ {\
+ gl_FragColor = vec4(1.0, 1.0, 0.66 ,1.0);\
+ }";
+
+ // Create a fragment shader object
+ fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+
+ // Load the source code into it
+ glShaderSource(fragmentShader, 1, (const char**)&fragmentShaderSource, NULL);
+
+ // Compile the source code
+ glCompileShader(fragmentShader);
+
+ // Check that the shader compiled
+ GLint isShaderCompiled;
+ glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &isShaderCompiled);
+ if (!isShaderCompiled)
+ {
+ // If an error happened, first retrieve the length of the log message
+ int infoLogLength, charactersWritten;
+ glGetShaderiv(fragmentShader, GL_INFO_LOG_LENGTH, &infoLogLength);
+
+ // Allocate enough space for the message and retrieve it
+ char* infoLog = new char[infoLogLength];
+ glGetShaderInfoLog(fragmentShader, infoLogLength, &charactersWritten, infoLog);
+
+ // Display the error in a dialog box
+ infoLogLength>1 ? printf("%s", infoLog) : printf("Failed to compile fragment shader.");
+
+ delete[] infoLog;
+ return FALSE;
+ }
+
+ /* Concept: Vertex Shaders
+ Vertex shaders primarily exist to allow a developer to express how to orient vertices in 3D space, through transformations like
+ Scaling, Translation or Rotation. Using the same basic layout and structure as a fragment shader, these take in vertex data and
+ output a fully transformed set of positions. Other inputs are also able to be used such as normals or texture coordinates, and can
+ also be transformed and output alongside the position data.
+ */
+ // Vertex shader code
+ const char* const vertexShaderSource = "\
+ attribute highp vec4 myVertex;\
+ uniform mediump mat4 transformationMatrix;\
+ void main(void)\
+ {\
+ gl_Position = transformationMatrix * myVertex;\
+ }";
+
+ // Create a vertex shader object
+ vertexShader = glCreateShader(GL_VERTEX_SHADER);
+
+ // Load the source code into the shader
+ glShaderSource(vertexShader, 1, (const char**)&vertexShaderSource, NULL);
+
+ // Compile the shader
+ glCompileShader(vertexShader);
+
+ // Check the shader has compiled
+ glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &isShaderCompiled);
+ if (!isShaderCompiled)
+ {
+ // If an error happened, first retrieve the length of the log message
+ int infoLogLength, charactersWritten;
+ glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &infoLogLength);
+
+ // Allocate enough space for the message and retrieve it
+ char* infoLog = new char[infoLogLength];
+ glGetShaderInfoLog(vertexShader, infoLogLength, &charactersWritten, infoLog);
+
+ // Display the error in a dialog box
+ infoLogLength>1 ? printf("%s", infoLog) : printf("Failed to compile vertex shader.");
+
+ delete[] infoLog;
+ return FALSE;
+ }
+
+ // Create the shader program
+ shaderProgram = glCreateProgram();
+
+ // Attach the fragment and vertex shaders to it
+ glAttachShader(shaderProgram, fragmentShader);
+ glAttachShader(shaderProgram, vertexShader);
+
+ // Bind the vertex attribute "myVertex" to location VERTEX_ARRAY (0)
+ glBindAttribLocation(shaderProgram, VERTEX_ARRAY, "myVertex");
+
+ // Link the program
+ glLinkProgram(shaderProgram);
+
+ // Check if linking succeeded in the same way we checked for compilation success
+ GLint isLinked;
+ glGetProgramiv(shaderProgram, GL_LINK_STATUS, &isLinked);
+ if (!isLinked)
+ {
+ // If an error happened, first retrieve the length of the log message
+ int infoLogLength, charactersWritten;
+ glGetProgramiv(shaderProgram, GL_INFO_LOG_LENGTH, &infoLogLength);
+
+ // Allocate enough space for the message and retrieve it
+ char* infoLog = new char[infoLogLength];
+ glGetProgramInfoLog(shaderProgram, infoLogLength, &charactersWritten, infoLog);
+
+ // Display the error in a dialog box
+ infoLogLength>1 ? printf("%s", infoLog) : printf("Failed to link shader program.");
+
+ delete[] infoLog;
+ return FALSE;
+ }
+
+ /* Use the Program
+ Calling glUseProgram tells OpenGL ES that the application intends to use this program for rendering. Now that it's installed into
+ the current state, any further glDraw* calls will use the shaders contained within it to process scene data. Only one program can
+ be active at once, so in a multi-program application this function would be called in the render loop. Since this application only
+ uses one program it can be installed in the current state and left there.
+ */
+ glUseProgram(shaderProgram);
+
+ if (![self testGLError:"glUseProgram"])
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function applicationDidFinishLaunching
+ @Input notification
+ @Description Called when the application has finished launching.
+ *******************************************************************************************************************************************/
+- (void) applicationDidFinishLaunching:(NSNotification *)notification
+{
+ // Create our window
+ NSRect frame = NSMakeRect(0,0,WIDTH, HEIGHT);
+ m_window = [[NSWindow alloc] initWithContentRect:frame styleMask:NSMiniaturizableWindowMask | NSTitledWindowMask | NSClosableWindowMask
+ backing:NSBackingStoreBuffered defer:NO];
+
+ if(!m_window)
+ {
+ NSLog(@"Failed to allocated the window.");
+ [self terminateApp];
+ }
+
+ [m_window setTitle:@"OGLES2HelloAPI"];
+
+ // Create our view
+ m_view = [[NSView alloc] initWithFrame:frame];
+
+ // Now we have a view, add it to our window
+ [m_window setContentView:m_view];
+ [m_window makeKeyAndOrderFront:nil];
+
+ // Add an observer so when our window is closed we terminate the app
+ [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(terminateApp) name:NSWindowWillCloseNotification
+ object:m_window];
+
+ EGLConfig config;
+
+ // Create and Initialise an EGLDisplay
+ if(![self createEGLDisplay:m_Display])
+ {
+ [self terminateApp];
+ }
+
+ // Choose an EGLConfig for the application, used when setting up the rendering surface and EGLContext
+ if(![self chooseEGLConfig:config fromDisplay:m_Display])
+ {
+ [self terminateApp];
+ }
+
+ // Create an EGLSurface for rendering
+ if(![self createEGLSurface:m_Surface fromDisplay:m_Display withConfig:config withView:m_view])
+ {
+ [self terminateApp];
+ }
+
+ // Setup the EGL Context from the other EGL constructs created so far, so that the application is ready to submit OpenGL ES commands
+ if(![self setupEGLContext:m_Context fromDisplay:m_Display withConfig:config withSurface:m_Surface])
+ {
+ [self terminateApp];
+ }
+
+ // Initialise the vertex data in the application
+ if(![self initialiseBuffer:m_vertexBuffer])
+ {
+ [self terminateApp];
+ }
+
+ // Initialise the fragment and vertex shaders used in the application
+ if(![self initialiseFragmentShader:m_fragShader andVertexShader:m_vertexBuffer withProgram:m_program])
+ {
+ [self terminateApp];
+ }
+
+ // Setup a timer to redraw the view at a regular interval
+ m_timer = [NSTimer scheduledTimerWithTimeInterval:(1.0 / KFPS) target:self selector:@selector(renderScene) userInfo:nil repeats:YES];
+}
+
+/*!*****************************************************************************************************************************************
+ @Function RenderScene
+ @Input eglDisplay The EGLDisplay used by the application
+ @Input eglSurface The EGLSurface created by the application
+ @Return Whether the function succeeds or not.
+ @Description Renders the scene to the framebuffer. Usually called within a loop.
+ *******************************************************************************************************************************************/
+- (BOOL) renderScene
+{
+ /* Set the clear color
+ At the start of a frame, generally you clear the image to tell OpenGL ES that you're done with whatever was there before and want to
+ draw a new frame. In order to do that however, OpenGL ES needs to know what colour to set in the image's place. glClearColor
+ sets this value as 4 floating point values between 0.0 and 1.0, as the Red, Green, Blue and Alpha channels. Each value represents
+ the intensity of the particular channel, with all 0.0 being transparent black, and all 1.0 being opaque white. Subsequent calls to
+ glClear with the colour bit will clear the frame buffer to this value.
+ The functions glClearDepth and glClearStencil allow an application to do the same with depth and stencil values respectively.
+ */
+ glClearColor(0.6f, 0.8f, 1.0f, 1.0f);
+
+ /* Clears the color buffer.
+ glClear is used here with the Colour Buffer to clear the colour. It can also be used to clear the depth or stencil buffer using
+ GL_DEPTH_BUFFER_BIT or GL_STENCIL_BUFFER_BIT, respectively.
+ */
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ // Get the location of the transformation matrix in the shader using its name
+ int matrixLocation = glGetUniformLocation(m_program, "transformationMatrix");
+
+ // Matrix used to specify the orientation of the triangle on screen.
+ const float transformationMatrix[] =
+ {
+ 1.0f,0.0f,0.0f,0.0f,
+ 0.0f,1.0f,0.0f,0.0f,
+ 0.0f,0.0f,1.0f,0.0f,
+ 0.0f,0.0f,0.0f,1.0f
+ };
+
+ // Pass the transformationMatrix to the shader using its location
+ glUniformMatrix4fv( matrixLocation, 1, GL_FALSE, transformationMatrix);
+ if (![self testGLError:"glUniformMatrix4fv"])
+ {
+ return FALSE;
+ }
+
+ // Enable the user-defined vertex array
+ glEnableVertexAttribArray(VERTEX_ARRAY);
+
+ // Sets the vertex data to this attribute index, with the number of floats in each position
+ glVertexAttribPointer(VERTEX_ARRAY, 3, GL_FLOAT, GL_FALSE, 0, 0);
+ if (![self testGLError:"glVertexAttribPointer"])
+ {
+ return FALSE;
+ }
+
+ /* Draw the triangle
+ glDrawArrays is a draw call, and executes the shader program using the vertices and other state set by the user. Draw calls are the
+ functions which tell OpenGL ES when to actually draw something to the framebuffer given the current state.
+ glDrawArrays causes the vertices to be submitted sequentially from the position given by the "first" argument until it has processed
+ "count" vertices. Other draw calls exist, notably glDrawElements which also accepts index data to allow the user to specify that
+ some vertices are accessed multiple times, without copying the vertex multiple times.
+ Others include versions of the above that allow the user to draw the same object multiple times with slightly different data, and
+ a version of glDrawElements which allows a user to restrict the actual indices accessed.
+ */
+ glDrawArrays(GL_TRIANGLES, 0, 3);
+ if (![self testGLError:"glDrawArrays"])
+ {
+ return FALSE;
+ }
+
+ /* Present the display data to the screen.
+ When rendering to a Window surface, OpenGL ES is double buffered. This means that OpenGL ES renders directly to one frame buffer,
+ known as the back buffer, whilst the display reads from another - the front buffer. eglSwapBuffers signals to the windowing system
+ that OpenGL ES 2.0 has finished rendering a scene, and that the display should now draw to the screen from the new data. At the same
+ time, the front buffer is made available for OpenGL ES 2.0 to start rendering to. In effect, this call swaps the front and back
+ buffers.
+ */
+ if (!eglSwapBuffers(m_Display, m_Surface) )
+ {
+ [self testGLError:"eglSwapBuffers"];
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function deInitialiseGLState
+ @Description Releases the resources
+ *******************************************************************************************************************************************/
+- (void) deInitialiseGLState
+{
+ // Frees the OpenGL handles for the program and the 2 shaders
+ glDeleteShader(m_fragShader);
+ glDeleteShader(m_vertexShader);
+ glDeleteProgram(m_program);
+
+ // Delete the VBO as it is no longer needed
+ glDeleteBuffers(1, &m_vertexBuffer);
+}
+
+/*!*****************************************************************************************************************************************
+ @Function releaseEGLState
+ @Input eglDisplay The EGLDisplay used by the application
+ @Description Releases all resources allocated by EGL
+ *******************************************************************************************************************************************/
+- (void) releaseEGLState:(EGLDisplay)eglDisplay
+{
+ // To release the resources in the context, first the context has to be released from its binding with the current thread.
+ eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+
+ // Terminate the display, and any resources associated with it (including the EGLContext)
+ eglTerminate(eglDisplay);
+}
+
+/*!*****************************************************************************************************************************************
+ @Function applicationWillTerminate
+ @Description Called when the app is about to terminate.
+ *******************************************************************************************************************************************/
+- (void) applicationWillTerminate:(NSNotification *)notification
+{
+ // Release our timer
+ [m_timer invalidate];
+
+ [self deInitialiseGLState];
+ [self releaseEGLState:m_Display];
+
+ // Release our view and window
+ [m_view release];
+ m_view = nil;
+
+ [m_window release];
+ m_window = nil;
+}
+
+/*!*****************************************************************************************************************************************
+ @Function terminateApp
+ @Description Attempts to immediately terminate the application.
+ *******************************************************************************************************************************************/
+- (void) terminateApp
+{
+ [NSApp terminate:nil];
+}
+
+@end
+
+/*!*****************************************************************************************************************************************
+ @Function main
+ @Input argc Number of arguments passed to the application, ignored.
+ @Input argv Command line strings passed to the application, ignored.
+ @Return Result code to send to the Operating System
+ @Description Main function of the program, executes other functions.
+ *******************************************************************************************************************************************/
+int main(int argc, char **argv)
+{
+ return NSApplicationMain(argc, (const char **)argv);
+}
+
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