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GLWindow.cpp
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GLWindow.cpp
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#include "GLWindow.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/epoll.h>
#define ASSERT(X, Y) if(!(X)){ std::cout << Y; return false; }
#define _INITEXT_(TYPE, NAME) NAME = (TYPE)eglGetProcAddress(#NAME); if(!NAME){ std::cout << "Could not init " << #NAME << std::endl; return false; }
uint_fast32_t GLWindow::screen_width, GLWindow::screen_height;
int GLWindow::epoll;
int GLWindow::mousex, GLWindow::mousey, GLWindow::mousew;
int GLWindow::mouselx, GLWindow::mousely, GLWindow::mouselw;
std::bitset<KEY_MAX> GLWindow::keystate, GLWindow::keydown, GLWindow::keyup;
int GLWindow::fdstdin;
char GLWindow::strinbuffer[256];
bool GLWindow::newinput;
EGLDisplay GLWindow::display;
EGLContext GLWindow::context;
EGLSurface GLWindow::surface;
uint_fast32_t GLWindow::looping;
uint_fast32_t GLWindow::frame;
uint_fast64_t GLWindow::time_ns;
uint_fast32_t GLWindow::dtime_ns;
//PFNGLDISCARDFRAMEBUFFEREXTPROC glDiscardFramebufferEXT;
//PFNGLGETBUFFERPOINTERVOESPROC glGetBufferPointervOES;
//PFNGLMAPBUFFEROESPROC glMapBufferOES;
//PFNGLUNMAPBUFFEROESPROC glUnmapBufferOES;
uint32_t GLWindow::ScreenWidth()
{
return screen_width;
}
uint32_t GLWindow::ScreenHeight()
{
return screen_height;
}
unsigned GLWindow::Frame()
{
return frame;
}
float GLWindow::Time()
{
return 1e-9f * time_ns;
}
uint_fast64_t GLWindow::TimeNS()
{
return time_ns;
}
float GLWindow::DTime()
{
return 1e-9f * dtime_ns;
}
void GLWindow::BreakLoop()
{
looping = 0;
}
bool GLWindow::InitGL()
{
static const EGLint attribute_list[] =
{
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_NONE
};
static const EGLint context_attributes[] =
{
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
EGLint num_config;
EGLConfig config;
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
ASSERT(display != EGL_NO_DISPLAY, "Could not get display.");
EGLBoolean result = eglInitialize(display, 0, 0);
ASSERT(result != EGL_FALSE, "Could not initialize EGL.");
result = eglChooseConfig(display, attribute_list, &config, 1, &num_config);
ASSERT(result != EGL_FALSE, "Could not find a valid configuration.");
result = eglBindAPI(EGL_OPENGL_ES_API);
ASSERT(result != EGL_FALSE, "eglBindAPI error.");
context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attributes);
ASSERT(context != EGL_NO_CONTEXT, "Could not create context.");
DISPMANX_MODEINFO_T mode_info;
DISPMANX_DISPLAY_HANDLE_T dispman_display = vc_dispmanx_display_open(0); // 0 = LCD
int success = vc_dispmanx_display_get_info(dispman_display, &mode_info);
ASSERT(success >= 0, "Could not get the display size.");
screen_width = mode_info.width;
screen_height = mode_info.height;
VC_RECT_T dst_rect;
dst_rect.x = 0;
dst_rect.y = 0;
dst_rect.width = screen_width;
dst_rect.height = screen_height;
VC_RECT_T src_rect;
src_rect.x = 0;
src_rect.y = 0;
src_rect.width = screen_width << 16;
src_rect.height = screen_height << 16;
static VC_DISPMANX_ALPHA_T alpha =
{
DISPMANX_FLAGS_ALPHA_FIXED_ALL_PIXELS,
255,
0
};
DISPMANX_UPDATE_HANDLE_T dispman_update = vc_dispmanx_update_start(0);
DISPMANX_ELEMENT_HANDLE_T dispman_element = vc_dispmanx_element_add(dispman_update, dispman_display, 0, &dst_rect, 0, &src_rect, DISPMANX_PROTECTION_NONE, &alpha, (DISPMANX_CLAMP_T *)NULL, (DISPMANX_TRANSFORM_T)0);
static EGL_DISPMANX_WINDOW_T nativewindow;
nativewindow.element = dispman_element;
nativewindow.width = screen_width;
nativewindow.height = screen_height;
vc_dispmanx_update_submit_sync(dispman_update);
surface = eglCreateWindowSurface(display, config, &nativewindow, 0);
ASSERT(surface != EGL_NO_SURFACE, "Could not create a window surface.");
result = eglMakeCurrent(display, surface, surface, context);
ASSERT(result != EGL_FALSE, "Could not make current.");
//std::cout << glGetString(GL_EXTENSIONS) << std::endl;
//_INITEXT_(PFNGLDISCARDFRAMEBUFFEREXTPROC, glDiscardFramebufferEXT);
//_INITEXT_(PFNGLGETBUFFERPOINTERVOESPROC, glGetBufferPointervOES);
//_INITEXT_(PFNGLMAPBUFFEROESPROC, glMapBufferOES);
//_INITEXT_(PFNGLUNMAPBUFFEROESPROC, glUnmapBufferOES);
InitInput();
return true;
}
void GLWindow::Loop(void (*Frame)())
{
timespec currenttime, lasttime, firsttime;
clock_gettime(CLOCK_MONOTONIC, &firsttime);
currenttime = firsttime;
frame = 0;
looping = 1;
do
{
lasttime = currenttime;
clock_gettime(CLOCK_MONOTONIC, ¤ttime);
dtime_ns = 1000000000u * (currenttime.tv_sec - lasttime.tv_sec) + (currenttime.tv_nsec - lasttime.tv_nsec); // can't be bigger than 4.294967295 seconds!
time_ns = 1000000000ull * (currenttime.tv_sec - firsttime.tv_sec) + (currenttime.tv_nsec - firsttime.tv_nsec); // can't be bigger than 584.54204609062639791999391588714 years!
UpdateInput();
Frame();
eglSwapBuffers(display, surface);
++frame;
} while(looping);
std::cout << frame << " frames drawn, average: " << 1e9f * frame / time_ns << std::endl;
}
char *GLWindow::LoadFile(const char *filepath, unsigned *filesize)
{
FILE *file = fopen(filepath, "rb");
if(!file)
{
std::cout << "Could not open " << filepath << std::endl;
return 0;
}
fseek(file, 0, SEEK_END);
unsigned size = ftell(file);
fseek(file, 0, SEEK_SET);
char *buffer = new char[size];
fread(buffer, size, 1, file);
fclose(file);
if(filesize)
*filesize = size;
if(size == 0)
{
delete [] buffer;
return 0;
}
return buffer;
}
bool GLWindow::CompileProgram(const unsigned &sp, const char* attriblist)
{
static const char defattriblist[] =
{
'A', '0', '\0', 0,
'A', '1', '\0', 1,
'A', '2', '\0', 2,
'A', '3', '\0', 3,
0
};
int result;
if(!attriblist)
attriblist = defattriblist;
while(*attriblist)
{
const char *attrib = attriblist;
attriblist += strlen(attrib) + 1;
unsigned nattrib = (unsigned)*attriblist;
glBindAttribLocation(sp, nattrib, attrib);
++attriblist;
}
glLinkProgram(sp);
glGetProgramiv(sp, GL_LINK_STATUS, &result);
if(result != GL_TRUE)
{
glGetProgramiv(sp, GL_INFO_LOG_LENGTH, &result);
char* tmp = new char[result];
glGetProgramInfoLog(sp, result, 0, tmp);
std::cout << "Could not link program:" << std::endl << tmp << std::endl;
delete tmp;
return false;
}
return true;
}
unsigned GLWindow::CreateShader(const char* filepath, const GLenum &type)
{
int result, shaderfilelen;
char* shaderfile = (char*)LoadFile(filepath, (unsigned*)&shaderfilelen);
if(!shaderfile)
return 0;
unsigned shader = glCreateShader(type);
glShaderSource(shader, 1, (const GLchar**)&shaderfile, &shaderfilelen);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
delete [] shaderfile;
if(result != GL_TRUE)
{
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &result);
char* tmp = new char[result];
glGetShaderInfoLog(shader, result, 0, tmp);
std::cout << "Could not compile shader:" << std::endl << tmp << std::endl;
return 0;
}
else
return shader;
}
bool GLWindow::InitShaders(unsigned *shaders, const unsigned *shadertable, const char **fragmentshaders, const unsigned &nfragmentshaders, const char **vertexshaders, const unsigned &nvertexshaders)
{
unsigned *fs = new unsigned[nfragmentshaders];
unsigned *vs = new unsigned[nvertexshaders];
char tmp[32];
for(unsigned i = 0; i < nfragmentshaders; ++i)
{
sprintf(tmp, "glsl/%s.fs", fragmentshaders[i]);
if(!(fs[i] = CreateShader(tmp, GL_FRAGMENT_SHADER)))
return false;
}
for(unsigned i = 0; i < nvertexshaders; ++i)
{
sprintf(tmp, "glsl/%s.vs", vertexshaders[i]);
if(!(vs[i] = CreateShader(tmp, GL_VERTEX_SHADER)))
return false;
}
unsigned nshaders;
while((nshaders = *shadertable++))
{
*shaders = glCreateProgram();
for(unsigned i = 0; i < nshaders; ++i)
{
unsigned t = *shadertable++;
unsigned s = t & 0x3fff;
if(t & 0x4000)
s = vs[s];
else
s = fs[s];
glAttachShader(*shaders, s);
}
if(!CompileProgram(*shaders, 0))
return false;
++shaders;
}
for(unsigned i=0; i<nfragmentshaders; ++i)
glDeleteShader(fs[i]);
for(unsigned i=0; i<nvertexshaders; ++i)
glDeleteShader(vs[i]);
delete [] fs;
delete [] vs;
return true;
}
bool GLWindow::InitInput()
{
char inputpath[18] = "/dev/input/event\0";
mousex = 0;
mousey = 0;
epoll = epoll_create1(0);
epoll_event event;
event.events = EPOLLIN | EPOLLET;
for(unsigned i = 0; i < 10; ++i)
{
inputpath[16] = '0' + i;
event.data.fd = open(inputpath, O_RDONLY | O_NONBLOCK);
if(event.data.fd <= 0)
continue;
else
epoll_ctl(epoll, EPOLL_CTL_ADD, event.data.fd, &event);
}
event.data.fd = fdstdin = open("/dev/stdin", O_RDONLY | O_NONBLOCK);
epoll_ctl(epoll, EPOLL_CTL_ADD, event.data.fd, &event);
return true;
}
bool GLWindow::Key(const unsigned &key)
{
return keystate[key];
}
bool GLWindow::KeyPressed(const unsigned &key)
{
return keydown[key];
}
bool GLWindow::KeyReleased(const unsigned &key)
{
return keyup[key];
}
int GLWindow::MouseX()
{
return mousex;
}
int GLWindow::MouseY()
{
return mousey;
}
void GLWindow::UpdateInput()
{
enum
{
MAX_EVENTS = 4,
};
static epoll_event events[MAX_EVENTS];
static input_event ie;
keydown.reset();
keyup.reset();
mouselx = mousex;
mousely = mousey;
mouselw = mousew;
int n = epoll_wait(epoll, events, MAX_EVENTS, 0);
newinput = false;
for(int i = 0; i < n; ++i) // for each message
{
if(events[i].data.fd == fdstdin)
{
newinput = true;
read(events[i].data.fd, strinbuffer, 256);
}
else
{
while(read(events[i].data.fd, &ie, sizeof(input_event)) == sizeof(input_event))
{
switch(ie.type)
{
case EV_KEY:
keystate[ie.code] = ie.value;
if(ie.value)
keydown[ie.code] = true;
else
keyup[ie.code] = true;
break;
case EV_REL:
switch(ie.code)
{
case REL_X:
mousex += ie.value;
break;
case REL_Y:
mousey -= ie.value;
break;
case REL_WHEEL:
mousew += ie.value;
};
break;
/*case EV_ABS:
switch(ie.code)
{
case ABS_X:
mousex = ie.value;
break;
case ABS_Y:
mousey = ie.value;
break;
case ABS_WHEEL:
mousew = ie.value;
};
break;*/
/*case EV_MSC:
switch(ie.code)
{
case MSC_SCAN:
break;
};
break;*/
//case EV_SYN:
//case EV_LED:
//case EV_SND:
//case EV_REP:
//case EV_FF:
//case EV_PWR:
//case EV_FF_STATUS:
//case EV_MAX:
}
//printf("time %ld.%06ld\ttype %d\tcode %d\tvalue %d\n", ie.time.tv_sec, ie.time.tv_usec, ie.type, ie.code, ie.value);
}
}
}
}
char *GLWindow::StrInput()
{
if(newinput)
return strinbuffer;
else
return 0;
}