gtk+3 linux c
Introduction#
code samples and some other stuff
css in action
#include <gtk/gtk.h>//jjk.c
static void destroy(GtkWidget *widget, gpointer data)
{
gtk_main_quit();
}
int main(int argc, char *argv[])
{
gtk_init(&argc, &argv);
GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Window");
g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);
GtkWidget *k;
k= gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window), k);
GtkWidget* la,*r;
la = gtk_button_new_with_label (",mkl");
gtk_fixed_put (GTK_FIXED (k), la,50,237);
gtk_widget_set_size_request(la, 98, 90);
// gtk_container_set_border_width(GTK_CONTAINER (la) , 5);
union {
char w[4]={0xf,0xe,0xd,0xa};;
uint t;
} tc;
GtkCssProvider *provider = gtk_css_provider_new ();
gtk_css_provider_load_from_path (provider,
"/home/alex/gtk-widgets.css", NULL);
r = gtk_button_new_with_label (",kii");
gtk_fixed_put (GTK_FIXED (k), r,150,237);
gtk_widget_set_size_request(r, 98, 90);
gtk_widget_set_size_request(GTK_WIDGET(window),300,349);
GtkStyleContext *context;
context = gtk_widget_get_style_context(la);
gtk_style_context_add_provider (context,
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_USER);
// gtk_style_context_save (context);
// gtk_style_context_add_provider_for_screen(gdk_screen_get_default(),
// GTK_STYLE_PROVIDER(provider),TK_STYLE_PROVIDER_PRIORITY_USER);
gtk_widget_show_all(GTK_WIDGET(window));
#define h 7
printf("%xh\n",tc.t);
gtk_main();
return 0;
}gtk-widgets.css
GtkButton:hover {
color: yellowgreen;
background-color: green;
opacity: 0.95;
text-decoration: underline;
background-image: -gtk-gradient (linear,
left top,
left bottom,
color-stop(0.0,rgba(34,97,70,1)),
color-stop(0.30,rgba(56,145,118,0.9)),
color-stop(0.81,rgba(34,131,116,0.9)),
color-stop(1.00,rgba(104,191,134,1)));
}
GtkButton:active{
color: yellowgreen;
background-color: green;
opacity: 0.97;
text-decoration: underline;
background-image: -gtk-gradient (linear,
left top,
left bottom,
color-stop(0.000,rgba(104,191,134,1)),
color-stop(0.11,rgba(34,131,116,1)),
color-stop(0.32,rgba(34,97,70,1)),
color-stop(0.70,rgba(56,145,118,1)),
color-stop(0.91,rgba(34,131,116,1)),
color-stop(1.00,rgba(104,191,134,1)));
}
GtkButton {
color: yellowgreen;
background-color: green;
opacity: 0.797;
text-decoration: underline;
background-image: -gtk-gradient (linear,
left top,
left bottom,
color-stop(0.0,rgba(34,97,70,1)),
color-stop(0.50,rgba(56,145,118,1)),
color-stop(0.51,rgba(34,131,116,1)),
color-stop(1.00,rgba(104,191,134,1)));
}
c++ jjk.c --target=arm-linux-gnu `pkg-config --libs --cflags gtk+-3.0` -o op glarea sample
Shaders 3.3 + extension.seen at radeon hd5500
#version 330triangles deployed so that normal to point out of a cube.trace each triangle 3points order.
//#include <stdio.h>
//#include <string.h>
//#include <iostream>
//#include <glib.h>
#include <gdk/gdkx.h>
#include <epoxy/glx.h>
#include <epoxy/gl.h>
#include <gtk/gtk.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
const GLchar *vert_src ="\n" \
"#version 330 \n" \
" #extension GL_ARB_explicit_uniform_location : enable \n" \
" \n" \
" out vec4 knn; \n" \
" layout(location = 0) in vec4 in_position; \n" \
" layout(location =10)uniform mat4 projection; \n" \
" out vec4 P; \n" \
"void main() \n" \
"{ \n" \
" gl_Position = projection*in_position; \n" \
"knn=in_position ; \n" \
" \n" \
"// gl_Position = in_position; \n" \
"} \n" ;
const GLchar *frag_src ="\n" \
"#version 330 \n" \
" vec4 b; \n" \
" in vec4 knn; \n" \
"void main (void) \n" \
"{ \n" \
" if(gl_FrontFacing){ \n" \
" b= vec4(gl_FragCoord.x/10.0,gl_FragCoord.y/357.0,gl_FragCoord.z* 0.5,1.0); \n" \
" gl_FragColor = vec4(0.021,-.1777*(knn.y+2)+0.1+1.21557*knn.x+knn.z ,1.215*knn.z+0.583*knn.y +.0357*knn.x+3*b.y, 1.0); \n" \
" } \n" \
"else discard; \n" \
" \n" \
" \n" \
"} \n";
GLfloat t[16]={ 1,0,0,0,
0,1,0,0,
0,0,1,0,
0,0,0,1};
glm::mat4 yt,b;
GLuint gl_vao, gl_buffer, gl_program;
static gboolean realise(GtkGLArea *area, GdkGLContext *context)
{
gtk_gl_area_make_current(GTK_GL_AREA(area));
if (gtk_gl_area_get_error (GTK_GL_AREA(area)) != NULL)
{
printf("failed to initialiize buffers\n");
return false;
}
GLfloat verts[] =
{
+0.7,+0.7,+0.7,
-0.7,0.7, 0.7,
-0.7,+0.7, -0.7,
0.7,+0.7, -0.7,
+0.7,+0.7,+0.7,
-0.7,+0.7, -0.7,
-0.7,-0.7, +0.7,
+0.7,+0.7,+0.7,
-0.7,0.7, 0.7,
+0.7,+0.7,+0.7,
-0.7,-0.7, +0.7,
0.7,-0.7, 0.7,
+0.7,-0.7,-0.7,
-0.7,-0.7,-0.7,
0.7,+0.7, -0.7,
-0.7,+0.7, -0.7,
0.7,+0.7, -0.7,
-0.7,-0.7, -0.7,
-0.7,-0.7, +0.7,
-0.7,-0.7, -0.7,
0.7,-0.7, 0.7,
+0.7,-0.7, -0.7,
0.7,-0.7, 0.7,
-0.7,-0.7, -0.7,
0.7,+0.7, -0.7,
+0.7,+0.7,+0.7,
+0.7,-0.7, -0.7,
0.7,-0.7, -0.7,
+0.7,+0.7,+0.7,
0.7,-0.7, 0.7,
-0.7,-0.7, -0.7,
-0.7,0.7, 0.7,
-0.7,+0.7, -0.7,
-0.7,-0.7, +0.7,
-0.7,0.7, 0.7,
-0.7,-0.7, -0.7
};
b=glm::lookAt(glm::vec3(1.75,-2.38,1.4444), glm::vec3( 0., 0., 0.),glm::vec3( 0.,0.2,-00.));
yt=glm::perspective(45., 1., 1.2, 300.);
b=yt*b*glm::mat4(1.);
//b=glm::lookAt(glm::vec3(0., 0.,-1.),glm::vec3( 0., 0., 0.),glm::vec3( 0.,025.,-1.));
//yt=yt*b;
GLuint frag_shader, vert_shader;
frag_shader = glCreateShader(GL_FRAGMENT_SHADER);
vert_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(frag_shader, 1, &frag_src, NULL);
glShaderSource(vert_shader, 1, &vert_src, NULL);
glCompileShader(frag_shader);
glCompileShader(vert_shader);
gl_program = glCreateProgram();
glAttachShader(gl_program, frag_shader);
glAttachShader(gl_program, vert_shader);
glLinkProgram(gl_program);
// glUniformMatrix4fv(1, 1, 0, glm::value_ptr(b));
glGenVertexArrays(1, &gl_vao);
glBindVertexArray(gl_vao);
glGenBuffers(1, &gl_buffer);
glBindBuffer(GL_ARRAY_BUFFER, gl_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
glBindVertexArray(0);
return TRUE;
}
static gboolean render(GtkGLArea *area, GdkGLContext *context)
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.0, 0.0, 0.0, 1.0);
glUseProgram(gl_program);
glUniformMatrix4fv(10, 1, 0, &b[0][0]);
glBindVertexArray(gl_vao);
glDrawArrays(GL_TRIANGLES,0,36 );
glBindVertexArray (0);
glUseProgram (0);
glFlush();
return TRUE;
}
int main(int argc, char** argv)
{
gtk_init(&argc, &argv);
GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL),
*gl_area = gtk_gl_area_new();
g_signal_connect(window, "delete-event", G_CALLBACK(gtk_main_quit), NULL);
g_signal_connect(gl_area, "realize", G_CALLBACK(realise), NULL);
g_signal_connect(gl_area, "render", G_CALLBACK(render), NULL);
gtk_container_add(GTK_CONTAINER(window), gl_area);
gtk_widget_show_all(window);
gtk_main();
return 0;
}