Hi:
I am studying OpenGL on macosx and studying OpenGLES on iOS, on the iOS, I can use the GLKBaseEffect to develop a OpenGLES app and It worked very well, here is my code which for iOS platform.
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize baseEffect;
//////////////////////////////////
// This data type is used to store information for each vertex
typedef struct
{
GLKVector3 positionCoords;
}
SceneVertex;
static const SceneVertex vertices[] =
{
{{-0.5f, -0.5f, 0.0}}, // lower left corner
{{0.5f, -0.5f, 0.0}}, // lower right corner
{{-0.5f, 0.5f, 0.0}} // upper left corner
};
//////////////////////////////////////////////////////
// Called when the view controller's view is loaded
// Perform initialization before the view is asked to draw
- (void)viewDidLoad {
[super viewDidLoad];
// Verify the type of view created automatically by the
// Interface Builder storyboard
GLKView *view = (GLKView *)self.view;
NSAssert([view isKindOfClass:[GLKView class]], @"View controller's view is not a GLKView");
// Create an OpenGL ES 2.0 context and provide it to the
// view
view.context = [[EAGLContext alloc]initWithAPI:kEAGLRenderingAPIOpenGLES2];
// Make the new context current
[EAGLContext setCurrentContext:view.context];
// Create a base effect that provides standard OpenGL ES 2.0
// Shading Language programs and set constants to be used for
// all subsequent rendering
self.baseEffect = [[GLKBaseEffect alloc]init];
self.baseEffect.useConstantColor = GL_TRUE;
self.baseEffect.constantColor = GLKVector4Make(1.0f, 1.0f, 1.0f, 1.0f);
// Set the background color stored in the current context;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // background color
// Generate, bind , and initialize contents of a buffer
// stored in GPU memory
glGenBuffers(1, // STEP 1
&vertexBufferID);
glBindBuffer(GL_ARRAY_BUFFER, // STEP 2
vertexBufferID);
glBufferData( // STEP 3
GL_ARRAY_BUFFER, // Initialize buffer contentw
sizeof(vertices), // Number of bytes to copy
vertices, // Address of bytes to copy
GL_STATIC_DRAW); // Hint: cache in GPU memory
}
///////////////////////////////////////////////////////
// GLKView delegate method: Called by the view controller's view
// whenever Cocoa Touch asks the view controller;s view to
// draw itself. (In this case, render into a frame buffer that
// shares memory with a Core Animation Layer)
-(void)glkView:(GLKView *)view drawInRect:(CGRect)rect{
[self.baseEffect prepareToDraw];
// Clear Frame Buffer (erase previous drawing)
glClear(GL_COLOR_BUFFER_BIT);
// Enable use if position from bound vertex buffer
glEnableVertexAttribArray( // STEP 4
GLKVertexAttribPosition);
glVertexAttribPointer( // STEP 5
GLKVertexAttribPosition,
3, // three components per vertex
GL_FLOAT, // data is floating point
GL_FALSE, // no fixex point scalling
sizeof(SceneVertex), // no gaps in data
NULL); // NULL tells GPU to start at beginning of bound buffer
// Draw triangles using the first three vertices in the
// currently bound vertex buffer
glDrawArrays(GL_TRIANGLES, // STEP 6
0, // Start with first vertex in currently bound buffer
3); // Use three vertices from currently bound buffer
}so I tried use the GLKBaseEffect to render the macosx OpenGL app,here is the code for macosx platform:
//
// MyOpenGLView.h
// OpenGLES_Ch6_1_MacOSX
//
// Created by LEE on 1/16/20.
// Copyright © 2020 LEE. All rights reserved.
//
#import <Cocoa/Cocoa.h>
#import <GLKit/GLKit.h>
@class AGLKVertexAttribArrayBuffer;
NS_ASSUME_NONNULL_BEGIN
@interface MyOpenGLView : NSOpenGLView
@end
NS_ASSUME_NONNULL_END//
// MyOpenGLView.m
// OpenGLES_Ch6_1_MacOSX
//
// Created by LEE on 1/16/20.
// Copyright © 2020 LEE. All rights reserved.
//
#import "MyOpenGLView.h"
#import <OpenGL/gl.h>
#import "SceneCarModel.h"
#import "SceneRinkModel.h"
@interface MyOpenGLView ()
{
GLuint _program;
GLuint vertexBufferID;
}
@property (strong,nonatomic) GLKBaseEffect *baseEffect;
@end
@implementation MyOpenGLView
@synthesize baseEffect;
//////////////////////////////////////////////////////////////////
// GLSL program uniform indices.
enum{
UNIFORM_MODELVIEWPROJECTION_MATRIX,
USECONSTANTCOLOR,
NUM_UNIFORMS
};
////////////////////////////////////////////////////////////////
// GLSL program uniform IDs.
GLint uniforms[NUM_UNIFORMS];
typedef struct
{
GLKVector3 positionCoords;
}
SceneVertex;
static const SceneVertex vertices[] =
{
{{-0.5f, -0.5f, 0.0}}, // lower left corner
{{0.5f, -0.5f, 0.0}}, // lower right corner
{{-0.5f, 0.5f, 0.0}} // upper left corner
};
-(instancetype)initWithCoder:(NSCoder *)coder{
if (self = [super initWithCoder:coder]) {
[self.openGLContext makeCurrentContext];
self.baseEffect = [[GLKBaseEffect alloc]init];
self.baseEffect.useConstantColor = GL_TRUE;
self.baseEffect.constantColor = GLKVector4Make(0.0f, 1.0f, 1.0f, 1.0f);
// Create a base effect that provides standard OpenGL ES 2.0
// Shading Language programs and set constants to be used for
// all subsequent rendering
// Set the background color stored in the current context;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // background color
// Generate, bind , and initialize contents of a buffer
// stored in GPU memory
glGenBuffers(1, // STEP 1
&vertexBufferID);
glBindBuffer(GL_ARRAY_BUFFER, // STEP 2
vertexBufferID);
glBufferData( // STEP 3
GL_ARRAY_BUFFER, // Initialize buffer contentw
sizeof(vertices), // Number of bytes to copy
vertices, // Address of bytes to copy
GL_STATIC_DRAW); // Hint: cache in GPU memory
}
return self;
}
-(void)drawRect:(NSRect)dirtyRect{
[super drawRect:dirtyRect];
// glFinish();
}
-(void)update{
// [super update];
[self.baseEffect prepareToDraw];
// Clear Frame Buffer (erase previous drawing)
glClear(GL_COLOR_BUFFER_BIT);
// Enable use if position from bound vertex buffer
glEnableVertexAttribArray( // STEP 4
GLKVertexAttribPosition);
glVertexAttribPointer( // STEP 5
GLKVertexAttribPosition,
3, // three components per vertex
GL_FLOAT, // data is floating point
GL_FALSE, // no fixex point scalling
sizeof(SceneVertex), // no gaps in data
NULL); // NULL tells GPU to start at beginning of bound buffer
// Draw triangles using the first three vertices in the
// currently bound vertex buffer
glDrawArrays(GL_TRIANGLES, // STEP 6
0, // Start with first vertex in currently bound buffer
3); // Use three vertices from currently bound buffer
glFinish();
}
@endit's seems the GLKBaseEffect not work on the macosx OpenGL app, I don't why! could you give me some suggestion, thanks a lot!
