orca/sketches/surface_sharing/main.c

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#include <stdlib.h>
#include <string.h>
#define _USE_MATH_DEFINES //NOTE: necessary for MSVC
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#include <math.h>
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#include <stdio.h>
#include <stdlib.h>
#define MG_INCLUDE_GL_API 1
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#include "milepost.h"
#define LOG_SUBSYSTEM "Main"
#ifdef OS_WIN64
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#include <process.h>
#include <io.h>
#include <fcntl.h>
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#define dup2 _dup2
#define pipe(fds) _pipe(fds, 256, O_BINARY)
#define read _read
#define write _write
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#define process_id HANDLE
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process_id spawn_child(char* program, char** argv)
{
return ((process_id)_spawnv(P_NOWAIT, program, argv));
}
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void terminate_child(process_id child)
{
TerminateProcess(child, 0);
}
#elif OS_MACOS
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#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);
}
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void terminate_child(process_id child)
{
kill(child, SIGTERM);
}
#endif
unsigned int program;
const char* vshaderSource =
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//"#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 =
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//"#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)
{
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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)
{
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mp_init();
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mp_rect rect = { .x = 100, .y = 100, .w = 800, .h = 600 };
mp_window window = mp_window_create(rect, "test", 0);
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//NOTE: create surface
mg_surface surface = mg_surface_create_remote(800, 600, MG_BACKEND_GLES);
mg_surface_id connectionID = mg_surface_remote_id(surface);
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mg_surface_prepare(surface);
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//NOTE: init shader and gl state
mg_surface_prepare(surface);
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GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
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GLuint vertexBuffer;
glGenBuffers(1, &vertexBuffer);
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GLfloat vertices[] = {
-0.866 / 2, -0.5 / 2, 0, 0.866 / 2, -0.5 / 2, 0, 0, 0.5, 0
};
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glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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unsigned int vshader = glCreateShader(GL_VERTEX_SHADER);
unsigned int fshader = glCreateShader(GL_FRAGMENT_SHADER);
program = glCreateProgram();
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compile_shader(vshader, vshaderSource);
compile_shader(fshader, fshaderSource);
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glAttachShader(program, vshader);
glAttachShader(program, fshader);
glLinkProgram(program);
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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);
}
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glUseProgram(program);
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//NOTE: send context id to parent
write(writeFd, &connectionID, sizeof(connectionID));
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//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;
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default:
break;
}
}
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mg_surface_prepare(surface);
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mp_rect rect = mg_surface_get_frame(surface);
vec2 scaling = mg_surface_contents_scaling(surface);
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glViewport(0, 0, rect.w * scaling.x, rect.h * scaling.y);
glClearColor(0.3, 0.3, 1, 1);
glClear(GL_COLOR_BUFFER_BIT);
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static float alpha = 0;
//f32 aspect = frameSize.x/frameSize.y;
f32 aspect = 800 / (f32)600;
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GLfloat matrix[] = { cosf(alpha) / aspect, sinf(alpha), 0, 0,
-sinf(alpha) / aspect, cosf(alpha), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1 };
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alpha += 2 * M_PI / 120;
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glUniformMatrix4fv(0, 1, false, matrix);
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glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(0);
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glDrawArrays(GL_TRIANGLES, 0, 3);
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mg_surface_present(surface);
}
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mp_terminate();
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return (0);
}
int main(int argc, char** argv)
{
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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);
}