orca/examples/surface_sharing/main.c

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#include<stdlib.h>
#include<string.h>
#define _USE_MATH_DEFINES //NOTE: necessary for MSVC
#include<math.h>
#include<stdlib.h>
#include<stdio.h>
#define MG_INCLUDE_GL_API 1
#include"milepost.h"
#define LOG_SUBSYSTEM "Main"
#ifdef OS_WIN64
#include<process.h>
#include<io.h>
#include<fcntl.h>
#define dup2 _dup2
#define pipe(fds) _pipe(fds, 256, O_BINARY)
#define read _read
#define write _write
#define process_id HANDLE
process_id spawn_child(char* program, char** argv)
{
return((process_id)_spawnv(P_NOWAIT, program, argv));
}
void terminate_child(process_id child)
{
TerminateProcess(child, 0);
}
#elif OS_MACOS
#include<unistd.h>
#include<signal.h>
#define process_id pid_t
process_id spawn_child(char* program, char** argv)
{
pid_t pid = fork();
if(!pid)
{
char* envp[] = {0};
execve(program, argv, envp);
assert(0);
}
return(pid);
}
void terminate_child(process_id child)
{
kill(child, SIGTERM);
}
#endif
unsigned int program;
const char* vshaderSource =
//"#version 320 es\n"
"attribute vec4 vPosition;\n"
"uniform mat4 transform;\n"
"void main()\n"
"{\n"
" gl_Position = transform*vPosition;\n"
"}\n";
const char* fshaderSource =
//"#version 320 es\n"
"precision mediump float;\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
void compile_shader(GLuint shader, const char* source)
{
glShaderSource(shader, 1, &source, 0);
glCompileShader(shader);
int err = glGetError();
if(err)
{
printf("gl error: %i\n", err);
}
int status = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetShaderInfoLog(shader, 256, &size, buffer);
printf("shader error: %.*s\n", size, buffer);
}
}
int child_main(int writeFd)
{
mp_init();
mp_rect rect = {.x = 100, .y = 100, .w = 800, .h = 600};
mp_window window = mp_window_create(rect, "test", 0);
//NOTE: create surface
mg_surface surface = mg_surface_create_remote(800, 600, MG_BACKEND_GLES);
mg_surface_id connectionID = mg_surface_remote_id(surface);
mg_surface_prepare(surface);
//NOTE: init shader and gl state
mg_surface_prepare(surface);
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
GLuint vertexBuffer;
glGenBuffers(1, &vertexBuffer);
GLfloat vertices[] = {
-0.866/2, -0.5/2, 0, 0.866/2, -0.5/2, 0, 0, 0.5, 0};
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
unsigned int vshader = glCreateShader(GL_VERTEX_SHADER);
unsigned int fshader = glCreateShader(GL_FRAGMENT_SHADER);
program = glCreateProgram();
compile_shader(vshader, vshaderSource);
compile_shader(fshader, fshaderSource);
glAttachShader(program, vshader);
glAttachShader(program, fshader);
glLinkProgram(program);
int status = 0;
glGetProgramiv(program, GL_LINK_STATUS, &status);
if(!status)
{
char buffer[256];
int size = 0;
glGetProgramInfoLog(program, 256, &size, buffer);
printf("link error: %.*s\n", size, buffer);
}
glUseProgram(program);
//NOTE: send context id to parent
write(writeFd, &connectionID, sizeof(connectionID));
//NOTE: render loop
while(!mp_should_quit())
{
mp_pump_events(0);
mp_event event = {0};
while(mp_next_event(&event))
{
switch(event.type)
{
case MP_EVENT_WINDOW_CLOSE:
{
mp_request_quit();
} break;
default:
break;
}
}
mg_surface_prepare(surface);
mp_rect rect = mg_surface_get_frame(surface);
vec2 scaling = mg_surface_contents_scaling(surface);
glViewport(0, 0, rect.w*scaling.x, rect.h*scaling.y);
glClearColor(0.3, 0.3, 1, 1);
glClear(GL_COLOR_BUFFER_BIT);
static float alpha = 0;
//f32 aspect = frameSize.x/frameSize.y;
f32 aspect = 800/(f32)600;
GLfloat matrix[] = {cosf(alpha)/aspect, sinf(alpha), 0, 0,
-sinf(alpha)/aspect, cosf(alpha), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1};
alpha += 2*M_PI/120;
glUniformMatrix4fv(0, 1, false, matrix);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(0);
glDrawArrays(GL_TRIANGLES, 0, 3);
mg_surface_present(surface);
}
mp_terminate();
return(0);
}
int main(int argc, char** argv)
{
LogLevel(LOG_LEVEL_DEBUG);
if(argc > 1)
{
if(!strcmp(argv[1], "--child"))
{
int writeFd = atoi(argv[2]);
printf("child process created with file desc %i\n", writeFd);
return(child_main(writeFd));
}
else
{
return(-1);
}
}
// setvbuf( stdout, NULL, _IONBF, 0 );
mp_init();
//NOTE: create main window
mp_rect rect = {.x = 100, .y = 100, .w = 800, .h = 600};
mp_window window = mp_window_create(rect, "test", 0);
//NOTE: create surface client
mg_surface surface = mg_surface_create_host(window);
//NOTE setup descriptors
int fileDesc[2];
pipe(fileDesc);
printf("parent process created readFd %i and writeFd %i\n", fileDesc[0], fileDesc[1]);
char writeDescStr[64];
snprintf(writeDescStr, 64, "%i", fileDesc[1]);
char* args[] = {"bin/example_surface_sharing", "--child", writeDescStr, 0};
process_id child = spawn_child(args[0], args);
//NOTE: read the connection id
mg_surface_id connectionID = 0;
read(fileDesc[0], &connectionID, sizeof(connectionID));
printf("received child connection id %llu\n", connectionID);
//NOTE: connect the client
mg_surface_host_connect(surface, connectionID);
//NOTE: show the window
mp_window_bring_to_front(window);
while(!mp_should_quit())
{
mp_pump_events(0);
mp_event event = {0};
while(mp_next_event(&event))
{
switch(event.type)
{
case MP_EVENT_WINDOW_CLOSE:
{
mp_request_quit();
} break;
default:
break;
}
}
mg_surface_prepare(surface);
mg_surface_present(surface);
}
terminate_child(child);
mp_terminate();
return(0);
}