Code examples for opening windows for various purposes in very few bytes
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154 lines
3.6 KiB

#define GL_GLEXT_PROTOTYPES why
#include<stdio.h>
#include<stdbool.h>
#include<stdlib.h>
#include<stdint.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glu.h>
#include <GL/glext.h>
#include "shader.h"
static char* vshader = "#version 450\nvec2 y=vec2(1.,-1);\nvec4 x[4]={y.yyxx,y.xyxx,y.yxxx,y.xxxx};void main(){gl_Position=x[gl_VertexID];}";
#define CANVAS_WIDTH 1920
#define CANVAS_HEIGHT 1080
// #define DEBUG
GLuint vao;
GLuint p;
GTimer* gtimer;
static gboolean
on_render (GtkGLArea *glarea, GdkGLContext *context)
{
float itime = g_timer_elapsed(gtimer, NULL);
if (itime > 10.0) gtk_main_quit();
glUseProgram(p);
glUniform1f(0, itime);
glBindVertexArray(vao);
glVertexAttrib1f(0, 0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
return TRUE;
}
static void on_realize(GtkGLArea *glarea)
{
gtk_gl_area_make_current(glarea);
// compile shader
GLuint f = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(f, 1, &shader_frag, NULL);
glCompileShader(f);
#ifdef DEBUG
GLint isCompiled = 0;
glGetShaderiv(f, GL_COMPILE_STATUS, &isCompiled);
if(isCompiled == GL_FALSE) {
GLint maxLength = 0;
glGetShaderiv(f, GL_INFO_LOG_LENGTH, &maxLength);
char* error = malloc(maxLength);
glGetShaderInfoLog(f, maxLength, &maxLength, error);
printf("%s\n", error);
exit(-10);
}
#endif
GLuint v = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(v, 1, &vshader, NULL);
glCompileShader(v);
#ifdef DEBUG
GLint isCompiled2 = 0;
glGetShaderiv(v, GL_COMPILE_STATUS, &isCompiled2);
if(isCompiled2 == GL_FALSE) {
GLint maxLength = 0;
glGetShaderiv(v, GL_INFO_LOG_LENGTH, &maxLength);
char* error = malloc(maxLength);
glGetShaderInfoLog(v, maxLength, &maxLength, error);
printf("%s\n", error);
exit(-10);
}
#endif
// link shader
p = glCreateProgram();
glAttachShader(p,v);
glAttachShader(p,f);
glLinkProgram(p);
#ifdef DEBUG
GLint isLinked = 0;
glGetProgramiv(p, GL_LINK_STATUS, (int *)&isLinked);
if (isLinked == GL_FALSE) {
GLint maxLength = 0;
glGetProgramiv(p, GL_INFO_LOG_LENGTH, &maxLength);
char* error = malloc(maxLength);
glGetProgramInfoLog(p, maxLength, &maxLength,error);
printf("%s\n", error);
exit(-10);
}
#endif
glGenVertexArrays(1, &vao);
GdkGLContext *context = gtk_gl_area_get_context(glarea);
GdkWindow *glwindow = gdk_gl_context_get_window(context);
GdkFrameClock *frame_clock = gdk_window_get_frame_clock(glwindow);
// Connect update signal:
g_signal_connect_swapped(frame_clock, "update", G_CALLBACK(gtk_gl_area_queue_render), glarea);
// Start updating:
gdk_frame_clock_begin_updating(frame_clock);
}
void _start() {
asm volatile("sub $8, %rsp\n");
typedef void (*voidWithOneParam)(int*);
voidWithOneParam gtk_init_one_param = (voidWithOneParam)gtk_init;
(*gtk_init_one_param)(NULL);
gtimer = g_timer_new();
GtkWidget *win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
GtkWidget *glarea = gtk_gl_area_new();
gtk_container_add(GTK_CONTAINER(win), glarea);
g_signal_connect(win, "destroy", gtk_main_quit, NULL);
g_signal_connect(glarea, "realize", G_CALLBACK(on_realize), NULL);
g_signal_connect(glarea, "render", G_CALLBACK(on_render), NULL);
gtk_widget_show_all (win);
gtk_window_fullscreen((GtkWindow*)win);
GdkWindow* window = gtk_widget_get_window(win);
GdkCursor* Cursor = gdk_cursor_new(GDK_BLANK_CURSOR);
gdk_window_set_cursor(window, Cursor);
gtk_main();
asm volatile(".intel_syntax noprefix");
asm volatile("push 231"); //exit_group
asm volatile("pop rax");
// asm volatile("xor edi, edi");
asm volatile("syscall");
asm volatile(".att_syntax prefix");
__builtin_unreachable();
// return 0;
}