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#include <gtk/gtk.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/glcorearb.h>
#include <stdlib.h>
#include <string.h>
#include "oscilloview.h"
struct oscilloview oscilloview_g = {
.flag = ATOMIC_FLAG_INIT
};
enum {
VIEW_SAMPLES = 1024,
};
static struct {
GtkWidget *win;
struct oscillodata oscillodata[LIBOPNA_OSCILLO_TRACK_COUNT];
GLuint program;
GLuint vs, fs;
GLuint vao;
GLuint vbo_linear;
GLuint vbo_data;
GLint uni_xpos;
GLint uni_ypos;
} g;
static void on_glarea_unrealize(GtkWidget *w, gpointer ptr) {
(void)w;
GtkGLArea *area = GTK_GL_AREA(w);
gtk_gl_area_make_current(area);
if (gtk_gl_area_get_error(area)) return;
glDeleteProgram(g.program);
glDeleteShader(g.vs);
glDeleteShader(g.fs);
glDeleteBuffers(1, &g.vbo_linear);
glDeleteBuffers(1, &g.vbo_data);
glDeleteVertexArrays(1, &g.vao);
}
static void on_destroy(GtkWidget *w, gpointer ptr) {
(void)w;
(void)ptr;
g.win = 0;
}
static const char v_sh[] =
"#version 110\n"
"attribute float coordx, coordy;\n"
"uniform float xpos, ypos;\n"
"void main(void) {\n"
" gl_Position = vec4(vec2(coordx/3.0 + xpos, coordy*2.0/3.0 + ypos), 0.0, 1.0);\n"
"}\n";
static const char f_sh[] =
"#version 110\n"
"void main(void) {\n"
" gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);\n"
"}\n";
static GLuint create_shader(const char *shader, GLenum type) {
GLuint s = glCreateShader(type);
glShaderSource(s, 1, &shader, 0);
glCompileShader(s);
GLint ok;
glGetShaderiv(s, GL_COMPILE_STATUS, &ok);
if (!ok) {
GLint len;
glGetShaderiv(s, GL_INFO_LOG_LENGTH, &len);
if (len > 0) {
char *log = malloc(len);
if (log) {
glGetShaderInfoLog(s, len, 0, log);
printf("%s shader error: \n%s\n",
(type == GL_VERTEX_SHADER) ? "vertex" : "fragment",
log);
free(log);
}
}
glDeleteShader(s);
return 0;
}
return s;
}
static void on_realize(GtkWidget *w, gpointer ptr) {
(void)ptr;
GtkGLArea *area = GTK_GL_AREA(w);
gtk_gl_area_make_current(area);
if (gtk_gl_area_get_error(area)) return;
g.program = glCreateProgram();
g.vs = create_shader(v_sh, GL_VERTEX_SHADER);
g.fs = create_shader(f_sh, GL_FRAGMENT_SHADER);
glAttachShader(g.program, g.vs);
glAttachShader(g.program, g.fs);
glBindAttribLocation(g.program, 0, "coordx");
glBindAttribLocation(g.program, 1, "coordy");
glLinkProgram(g.program);
glUseProgram(g.program);
g.uni_xpos = glGetUniformLocation(g.program, "xpos");
g.uni_ypos = glGetUniformLocation(g.program, "ypos");
glGenVertexArrays(1, &g.vao);
glBindVertexArray(g.vao);
glGenBuffers(1, &g.vbo_linear);
glBindBuffer(GL_ARRAY_BUFFER, g.vbo_linear);
static GLfloat linear_pos[VIEW_SAMPLES];
for (int i = 0; i < VIEW_SAMPLES; i++) {
linear_pos[i] = 2.0f*((i-512) / (float)VIEW_SAMPLES);
}
glBufferData(GL_ARRAY_BUFFER, sizeof(linear_pos), linear_pos, GL_STATIC_DRAW);
glVertexAttribPointer(0, 1, GL_FLOAT, GL_FALSE, 0, 0);
glGenBuffers(1, &g.vbo_data);
glBindBuffer(GL_ARRAY_BUFFER, g.vbo_data);
glBufferData(GL_ARRAY_BUFFER, 2*VIEW_SAMPLES, 0, GL_STREAM_DRAW);
glVertexAttribPointer(1, 1, GL_SHORT, GL_TRUE, 0, 0);
}
static gboolean on_render(GtkGLArea *area,
GdkGLContext *ctx,
gpointer ptr) {
(void)ptr;
if (!atomic_flag_test_and_set_explicit(
&oscilloview_g.flag, memory_order_acquire)) {
memcpy(g.oscillodata,
oscilloview_g.oscillodata,
sizeof(oscilloview_g.oscillodata));
atomic_flag_clear_explicit(&oscilloview_g.flag, memory_order_release);
}
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glClear(GL_COLOR_BUFFER_BIT);
for (int x = 0; x < 3; x++) {
for (int y = 0; y < 3; y++) {
int start = OSCILLO_SAMPLE_COUNT - VIEW_SAMPLES;
start -= (g.oscillodata[x*3+y].offset >> OSCILLO_OFFSET_SHIFT);
glBindBuffer(GL_ARRAY_BUFFER, g.vbo_data);
glBufferData(GL_ARRAY_BUFFER, 2*VIEW_SAMPLES, &g.oscillodata[x*3+y].buf[start], GL_STREAM_DRAW);
glUniform1f(g.uni_xpos, (x - 1) * (2.0f/3.0f));
glUniform1f(g.uni_ypos, (y - 1) * (-2.0f/3.0f));
glDrawArrays(GL_LINE_STRIP, 0, 1024);
}
}
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
return TRUE;
}
static gboolean tick_cb(GtkWidget *w, GdkFrameClock *clock, gpointer ptr) {
(void)clock;
(void)ptr;
gtk_widget_queue_draw(w);
return G_SOURCE_CONTINUE;
}
void show_oscilloview(void) {
if (!g.win) {
g.win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(g.win), "Oscilloscope view");
g_signal_connect(g.win, "destroy", G_CALLBACK(on_destroy), 0);
GtkWidget *glarea = gtk_gl_area_new();
g_signal_connect(G_OBJECT(glarea), "unrealize", G_CALLBACK(on_glarea_unrealize), 0);
gtk_gl_area_set_required_version(GTK_GL_AREA(glarea), 3, 2);
g_signal_connect(glarea, "render", G_CALLBACK(on_render), 0);
g_signal_connect(glarea, "realize", G_CALLBACK(on_realize), 0);
gtk_container_add(GTK_CONTAINER(g.win), glarea);
gtk_widget_add_tick_callback(glarea, tick_cb, 0, 0);
}
gtk_widget_show_all(g.win);
}
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