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| #define VERTEX_SHADER @"vertex"
#define FRAGMENT_SHADER @"fragment"
typedef struct
{
char* Name;
GLint Location;
}Uniform;
GLfloat Cube2VertexData[72] =
{
// right
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 1.5f,
0.5f, -0.5f, 1.5f,
// top
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 1.5f,
0.5f, 0.5f, 1.5f,
// left
-0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, 1.5f,
-0.5f, 0.5f, 1.5f,
// bottom
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 1.5f,
-0.5f, -0.5f, 1.5f,
// front
0.5f, 0.5f, 1.5f,
-0.5f, 0.5f, 1.5f,
-0.5f, -0.5f, 1.5f,
0.5f, -0.5f, 1.5f,
// back
0.5f, 0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
};
GLuint Cube2IndicesData[36] =
{
// right
0, 1, 2, 2, 3, 0,
// top
4, 5, 6, 6, 7, 4,
// left
8, 9, 10, 10, 11, 8,
// bottom
12, 13, 14, 14, 15, 12,
// front
16, 17, 18, 18, 19, 16,
// back
20, 21, 22, 22, 23, 20
};
GLfloat CubeVertexData[72] =
{
// right
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
// top
0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
// left
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
// bottom
-0.5f, -0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
0.5f, -0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
// front
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
// back
0.5f, 0.5f, -0.5f,
0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
};
GLuint CubeIndicesData[36] =
{
// right
0, 1, 2, 2, 3, 0,
// top
4, 5, 6, 6, 7, 4,
// left
8, 9, 10, 10, 11, 8,
// bottom
12, 13, 14, 14, 15, 12,
// front
16, 17, 18, 18, 19, 16,
// back
20, 21, 22, 22, 23, 20
};
@interface ViewController () {
GLuint _program;
GLint _uniformArraySize;
Uniform *_uniformArray;
GLuint _verticesVBO;
GLuint _indicesVBO;
GLuint _VAO;
GLuint _verticesVBO2;
GLuint _indicesVBO2;
GLKMatrix4 _projectionMatrix;
GLKMatrix4 _modelViewMatrix;
}
@end
@implementation ViewController
- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{
// Clear the screen
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
// Bind the VAO and the program
glBindVertexArrayOES( _VAO );
glUseProgram( _program );
for (int i = 0; i < _uniformArraySize; i++) {
if (!strcmp(_uniformArray[i].Name, "ModelViewProjectionMatrix"))
{
// Multiply the transformation matrices together
GLKMatrix4 modelViewProjectionMatrix = GLKMatrix4Multiply(_projectionMatrix, _modelViewMatrix);
glUniformMatrix4fv(_uniformArray[i].Location, 1, GL_FALSE, modelViewProjectionMatrix.m);
}
}
// Draw!
glDrawElements( GL_TRIANGLES, sizeof(CubeIndicesData)/sizeof(GLuint), GL_UNSIGNED_INT, NULL );
glDrawElements( GL_TRIANGLES, sizeof(Cube2IndicesData)/sizeof(GLuint), GL_UNSIGNED_INT, NULL );
}
- (void)update
{
_modelViewMatrix = GLKMatrix4RotateY(_modelViewMatrix, 0.2);
}
- (GLuint)compileShader:(NSString*)shaderName withType:(GLenum)shaderType
{
// Load the shader in memory
NSString *shaderPath = [[NSBundle mainBundle] pathForResource:shaderName ofType:@"glsl"];
NSError *error;
NSString *shaderString = [NSString stringWithContentsOfFile:shaderPath encoding:NSUTF8StringEncoding error:&error];
if(!shaderString)
{
NSLog(@"Error loading shader: %@", error.localizedDescription);
exit(1);
}
// Create the shader inside openGL
GLuint shaderHandle = glCreateShader(shaderType);
// Give that shader the source code loaded in memory
const char *shaderStringUTF8 = [shaderString UTF8String];
int shaderStringLength = [shaderString length];
glShaderSource(shaderHandle, 1, &shaderStringUTF8, &shaderStringLength);
// Compile the source code
glCompileShader(shaderHandle);
// Get the error messages in case the compiling has failed
GLint compileSuccess;
glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &compileSuccess);
if (compileSuccess == GL_FALSE) {
GLint logLength;
glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &logLength);
if(logLength > 0)
{
GLchar *log = (GLchar *)malloc(logLength);
glGetShaderInfoLog(shaderHandle, logLength, &logLength, log);
NSLog(@"Shader compile log:\n%s", log);
free(log);
}
exit(1);
}
return shaderHandle;
}
-(void)createProgram
{
// Compile both shaders
GLuint vertexShader = [self compileShader:VERTEX_SHADER withType:GL_VERTEX_SHADER];
GLuint fragmentShader = [self compileShader:FRAGMENT_SHADER withType:GL_FRAGMENT_SHADER];
// Create the program in openGL, attach the shaders and link them
GLuint programHandle = glCreateProgram();
glAttachShader(programHandle, vertexShader);
glAttachShader(programHandle, fragmentShader);
glLinkProgram(programHandle);
// Get the error message in case the linking has failed
GLint linkSuccess;
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
if (linkSuccess == GL_FALSE)
{
GLint logLength;
glGetProgramiv(programHandle, GL_INFO_LOG_LENGTH, &logLength);
if(logLength > 0)
{
GLchar *log = (GLchar *)malloc(logLength);
glGetProgramInfoLog(programHandle, logLength, &logLength, log);
NSLog(@"Program link log:\n%s", log);
free(log);
}
exit(1);
}
_program = programHandle;
}
-(void)getUniforms
{
GLint maxUniformLength;
GLint numberOfUniforms;
char *uniformName;
// Get the number of uniforms and the max length of their names
glGetProgramiv(_program, GL_ACTIVE_UNIFORMS, &numberOfUniforms);
glGetProgramiv(_program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &maxUniformLength);
_uniformArray = malloc(numberOfUniforms * sizeof(Uniform));
_uniformArraySize = numberOfUniforms;
for(int i = 0; i < numberOfUniforms; i++)
{
GLint size;
GLenum type;
GLint location;
// Get the Uniform Info
uniformName = malloc(sizeof(char) * maxUniformLength);
glGetActiveUniform(_program, i, maxUniformLength, NULL, &size, &type, uniformName);
_uniformArray[i].Name = uniformName;
// Get the uniform location
location = glGetUniformLocation(_program, uniformName);
_uniformArray[i].Location = location;
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Create context
self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
if (!self.context) {
NSLog(@"Failed to create ES context");
exit(1);
}
if (![EAGLContext setCurrentContext:self.context])
{
NSLog(@"Failed to set current OpenGL context");
exit(1);
}
// Initialize view
GLKView *view = (GLKView *)self.view;
view.context = self.context;
// Change the format of the depth renderbuffer
// This value is None by default
view.drawableDepthFormat = GLKViewDrawableDepthFormat16;
// Enable face culling and depth test
glEnable( GL_DEPTH_TEST );
glEnable( GL_CULL_FACE );
// Set up the viewport
int width = view.bounds.size.width;
int height = view.bounds.size.height;
glViewport(0, 0, width, height);
[self createProgram];
[self getUniforms];
// Make the vertex buffer
glGenBuffers( 1, &_verticesVBO );
glBindBuffer( GL_ARRAY_BUFFER, _verticesVBO );
glBufferData( GL_ARRAY_BUFFER, sizeof(CubeVertexData), CubeVertexData, GL_STATIC_DRAW );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
// Make the indices buffer
glGenBuffers( 1, &_indicesVBO );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, _indicesVBO );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, sizeof(CubeIndicesData), CubeIndicesData, GL_STATIC_DRAW );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
// Make the indices buffer2
glGenBuffers( 1, &_indicesVBO2 );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, _indicesVBO2 );
glBufferData( GL_ELEMENT_ARRAY_BUFFER, sizeof(Cube2IndicesData), Cube2IndicesData, GL_STATIC_DRAW );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
// Make the vertex buffer2
glGenBuffers( 1, &_verticesVBO2 );
glBindBuffer( GL_ARRAY_BUFFER, _verticesVBO2 );
glBufferData( GL_ARRAY_BUFFER, sizeof(Cube2VertexData), Cube2VertexData, GL_STATIC_DRAW );
glBindBuffer( GL_ARRAY_BUFFER, 0 );
// Bind the attribute pointers to the VAO
GLint attribute;
GLsizei stride = sizeof(GLfloat) * 3;
glGenVertexArraysOES( 1, &_VAO );
glBindVertexArrayOES( _VAO );
glBindBuffer( GL_ARRAY_BUFFER, _verticesVBO );
glBindBuffer( GL_ARRAY_BUFFER, _verticesVBO2 );
attribute = glGetAttribLocation(_program, "Position");
glEnableVertexAttribArray( attribute );
glVertexAttribPointer( attribute, 3, GL_FLOAT, GL_FALSE, stride, NULL );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, _indicesVBO );
glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, _indicesVBO2 );
glBindVertexArrayOES( 0 );
_modelViewMatrix = GLKMatrix4MakeLookAt(2.0f, 2.0f, 4.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
_projectionMatrix = GLKMatrix4MakePerspective(45.0f, (float)width/(float)height, 0.01f, 100.0f);
}
- (void)viewDidUnload
{
[super viewDidUnload];
[EAGLContext setCurrentContext:self.context];
glDeleteBuffers(1, &_verticesVBO);
glDeleteBuffers(1, &_indicesVBO);
glDeleteVertexArraysOES(1, &_VAO);
if (_program) {
glDeleteProgram(_program);
_program = 0;
}
for (int i = 0; i < _uniformArraySize; i++) {
free(_uniformArray[i].Name);
}
free(_uniformArray);
} |
(
Сообщение от Nikkilla
как рендерить в разных местах? сделать функцию "рендерить куб". вызвать раз. сделать транслейт. вызвать два.
