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124 lines
3.1 KiB
124 lines
3.1 KiB
11 years ago
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// Game.m
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// iOSGLEssentials
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//
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// Created by Joshua Moerman on 08/03/14.
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//
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//
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#import "Game.h"
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@import GLKit;
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#ifdef ESSENTIAL_GL_PRACTICES_IOS
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#define glBindVertexArray glBindVertexArrayOES
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#define glGenVertexArrays glGenVertexArraysOES
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#define glDeleteVertexArrays glDeleteVertexArraysOES
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#endif
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#define BUFFER_OFFSET(i) ((char *)NULL + (i))
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#ifdef ESSENTIAL_GL_PRACTICES_IOS
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NSString * file = @"Fractal-iOS";
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#else
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NSString * file = @"Fractal";
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#endif
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const GLfloat quad[] = {
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// x y z, r g b
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1, -1, 0, 1, 0, 0,
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-1, -1, 0, 0, 1, 0,
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1, 1, 0, 0, 0, 1,
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-1, 1, 0, 1, 1, 1
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};
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static void check_shader(GLuint s){
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GLint logLength;
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glGetShaderiv(s, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0) {
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GLchar *log = (GLchar *)malloc(logLength);
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glGetShaderInfoLog(s, logLength, &logLength, log);
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NSLog(@"Shader compile log:\n%s", log);
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free(log);
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}
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}
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@implementation Game{
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float time;
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GLuint program;
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GLint uniform;
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GLuint vao;
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GLuint posBufferName;
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}
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- (id)init{
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if(self = [super init]){
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time = 0;
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program = glCreateProgram();
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NSError * error = nil;
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NSString * vs = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:file ofType:@"vsh"] encoding:NSASCIIStringEncoding error:&error];
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NSString * fs = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:file ofType:@"fsh"] encoding:NSASCIIStringEncoding error:nil];
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GLchar const * vs_cstr = [vs UTF8String];
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GLchar const * fs_cstr = [fs UTF8String];
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GLuint v = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(v, 1, &vs_cstr, NULL);
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glCompileShader(v);
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check_shader(v);
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GLuint f = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(f, 1, &fs_cstr, NULL);
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glCompileShader(f);
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check_shader(f);
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glAttachShader(program, v);
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glAttachShader(program, f);
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glBindAttribLocation(program, 0, "position");
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glBindAttribLocation(program, 1, "color");
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glLinkProgram(program);
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uniform = glGetUniformLocation(program, "rotation");
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glDetachShader(program, v);
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glDeleteShader(v);
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glDetachShader(program, f);
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glDeleteShader(f);
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glGenBuffers(1, &posBufferName);
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glBindBuffer(GL_ARRAY_BUFFER, posBufferName);
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glBufferData(GL_ARRAY_BUFFER, 4*6*4, quad, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6*4, BUFFER_OFFSET(0));
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6*4, BUFFER_OFFSET(3*4));
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}
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return self;
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}
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- (void)update:(float)dt{
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time += dt;
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}
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- (void)draw{
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glClearColor(0.65f, 0.65f, 0.65f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glUseProgram(program);
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glUniform1f(uniform, time);
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glBindVertexArray(vao);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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@end
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