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Added pure X11/OpenGL demo

This commit is contained in:
vurtun 2016-04-30 14:50:54 +02:00
parent 12d4ed0115
commit 727e6f0caf
4 changed files with 982 additions and 0 deletions
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26
demo/x11_opengl3/Makefile Normal file
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# Install
BIN = demo
# Compiler
CC = clang
DCC = gcc
# Flags
CFLAGS = -std=c99 -pedantic -O2
SRC = main.c
OBJ = $(SRC:.c=.o)
# Modes
.PHONY: gcc
gcc: CC = gcc
gcc: $(BIN)
.PHONY: clang
clang: CC = clang
clang: $(BIN)
$(BIN):
@mkdir -p bin
rm -f bin/$(BIN) $(OBJS)
$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) -lX11 -lm -lGL -lm -lGLU

302
demo/x11_opengl3/main.c Normal file
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/* nuklear - v1.00 - public domain */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include <limits.h>
/* these defines are both needed for the header
* and source file. So if you split them remember
* to copy them as well. */
#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
#define NK_INCLUDE_FONT_BAKING
#define NK_INCLUDE_DEFAULT_FONT
#include "nuklear_x11.h"
#include "nuklear_x11.c"
#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600
#define MAX_VERTEX_BUFFER 512 * 1024
#define MAX_ELEMENT_BUFFER 128 * 1024
#define UNUSED(a) (void)a
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a)/sizeof(a)[0])
/* ===============================================================
*
* EXAMPLE
*
* ===============================================================*/
/* This are some code examples to provide a small overview of what can be
* done with this library. To try out an example uncomment the include
* and the corresponding function. */
/*#include "../style.c"*/
/*#include "../calculator.c"*/
/*#include "../overview.c"*/
/*#include "../node_editor.c"*/
/* ===============================================================
*
* DEMO
*
* ===============================================================*/
struct XWindow {
Display *dpy;
Window win;
XVisualInfo *vis;
Colormap cmap;
XSetWindowAttributes swa;
XWindowAttributes attr;
GLXFBConfig fbc;
int width, height;
};
static int gl_err = FALSE;
static int gl_error_handler(Display *dpy, XErrorEvent *ev)
{UNUSED((dpy, ev)); gl_err = TRUE;return 0;}
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputs("\n", stderr);
exit(EXIT_FAILURE);
}
static int
has_extension(const char *string, const char *ext)
{
const char *start, *where, *term;
where = strchr(ext, ' ');
if (where || *ext == '\0')
return FALSE;
for (start = string;;) {
where = strstr((const char*)start, ext);
if (!where) break;
term = where + strlen(ext);
if (where == start || *(where - 1) == ' ') {
if (*term == ' ' || *term == '\0')
return TRUE;
}
start = term;
}
return FALSE;
}
int main(int argc, char **argv)
{
/* Platform */
int running = 1;
struct XWindow win;
GLXContext glContext;
struct nk_context *ctx;
struct nk_color background;
memset(&win, 0, sizeof(win));
win.dpy = XOpenDisplay(NULL);
if (!win.dpy) die("Failed to open X display\n");
{
/* check glx version */
int glx_major, glx_minor;
if (!glXQueryVersion(win.dpy, &glx_major, &glx_minor))
die("[X11]: Error: Failed to query OpenGL version\n");
if ((glx_major == 1 && glx_minor < 3) || (glx_major < 1))
die("[X11]: Error: Invalid GLX version!\n");
}
{
/* find and pick matching framebuffer visual */
int fb_count;
static GLint attr[] = {
GLX_X_RENDERABLE, True,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
GLX_DOUBLEBUFFER, True,
None
};
GLXFBConfig *fbc;
fbc = glXChooseFBConfig(win.dpy, DefaultScreen(win.dpy), attr, &fb_count);
if (!fbc) die("[X11]: Error: failed to retrieve framebuffer configuration\n");
{
/* pick framebuffer with most samples per pixel */
int i;
int fb_best = -1, best_num_samples = -1;
for (i = 0; i < fb_count; ++i) {
XVisualInfo *vi = glXGetVisualFromFBConfig(win.dpy, fbc[i]);
if (vi) {
int sample_buffer, samples;
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLE_BUFFERS, &sample_buffer);
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLES, &samples);
if ((fb_best < 0) || (sample_buffer && samples > best_num_samples))
fb_best = i; best_num_samples = samples;
}
}
win.fbc = fbc[fb_best];
XFree(fbc);
win.vis = glXGetVisualFromFBConfig(win.dpy, win.fbc);
}
}
{
/* create window */
win.cmap = XCreateColormap(win.dpy, RootWindow(win.dpy, win.vis->screen), win.vis->visual, AllocNone);
win.swa.colormap = win.cmap;
win.swa.background_pixmap = None;
win.swa.border_pixel = 0;
win.swa.event_mask =
ExposureMask | KeyPressMask | KeyReleaseMask |
ButtonPress | ButtonReleaseMask| ButtonMotionMask |
Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
PointerMotionMask| StructureNotifyMask;
win.win = XCreateWindow(win.dpy, RootWindow(win.dpy, win.vis->screen), 0, 0,
WINDOW_WIDTH, WINDOW_HEIGHT, 0, win.vis->depth, InputOutput,
win.vis->visual, CWBorderPixel|CWColormap|CWEventMask, &win.swa);
if (!win.win) die("[X11]: Failed to create window\n");
XFree(win.vis);
XStoreName(win.dpy, win.win, "Demo");
XMapWindow(win.dpy, win.win);
}
{
/* create opengl context */
typedef GLXContext(*glxCreateContext)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
int(*old_handler)(Display*, XErrorEvent*) = XSetErrorHandler(gl_error_handler);
const char *extensions_str = glXQueryExtensionsString(win.dpy, DefaultScreen(win.dpy));
glxCreateContext create_context = (glxCreateContext)
glXGetProcAddressARB((const GLubyte*)"glXCreateContextAttribsARB");
gl_err = FALSE;
if (!has_extension(extensions_str, "GLX_ARB_create_context") || !create_context) {
fprintf(stdout, "[X11]: glXCreateContextAttribARB() not found...\n");
fprintf(stdout, "[X11]: ... using old-style GLX context\n");
glContext = glXCreateNewContext(win.dpy, win.fbc, GLX_RGBA_TYPE, 0, True);
} else {
GLint attr[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 0,
None
};
glContext = create_context(win.dpy, win.fbc, 0, True, attr);
XSync(win.dpy, False);
if (gl_err || !glContext) {
/* Could not create GL 3.0 context. Fallback to old 2.x context.
* If a version below 3.0 is requested, implementations will
* return the newest context version compatible with OpenGL
* version less than version 3.0.*/
attr[1] = 1; attr[3] = 0;
gl_err = FALSE;
fprintf(stdout, "[X11] Failed to create OpenGL 3.0 context\n");
fprintf(stdout, "[X11] ... using old-style GLX context!\n");
glContext = create_context(win.dpy, win.fbc, 0, True, attr);
}
}
XSync(win.dpy, False);
XSetErrorHandler(old_handler);
if (gl_err || !glContext)
die("[X11]: Failed to create an OpenGL context\n");
glXMakeCurrent(win.dpy, win.win, glContext);
}
ctx = nk_x11_init(win.dpy, win.win);
/* Load Fonts: if none of these are loaded a default font will be used */
{struct nk_font_atlas *atlas;
nk_x11_font_stash_begin(&atlas);
/*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
/*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
/*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
/*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
/*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
/*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
nk_x11_font_stash_end();
/*nk_style_set_font(ctx, &droid->handle);*/}
/* style.c */
/*set_style(ctx, THEME_WHITE);*/
/*set_style(ctx, THEME_RED);*/
/*set_style(ctx, THEME_BLUE);*/
/*set_style(ctx, THEME_DARK);*/
background = nk_rgb(28,48,62);
while (running)
{
/* Input */
XEvent evt;
nk_input_begin(ctx);
while (XCheckWindowEvent(win.dpy, win.win, win.swa.event_mask, &evt)){
if (XFilterEvent(&evt, win.win)) continue;
nk_x11_handle_event(&evt);
}
nk_input_end(ctx);
/* GUI */
{struct nk_panel layout;
if (nk_begin(ctx, &layout, "Demo", nk_rect(50, 50, 200, 200),
NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
{
enum {EASY, HARD};
static int op = EASY;
static int property = 20;
nk_layout_row_static(ctx, 30, 80, 1);
if (nk_button_label(ctx, "button", NK_BUTTON_DEFAULT))
fprintf(stdout, "button pressed\n");
nk_layout_row_dynamic(ctx, 30, 2);
if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
nk_layout_row_dynamic(ctx, 25, 1);
nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
}
nk_end(ctx);}
if (nk_window_is_closed(ctx, "Demo")) break;
/* -------------- EXAMPLES ---------------- */
/*calculator(ctx);*/
/*overview(ctx);*/
/*node_editor(ctx);*/
/* ----------------------------------------- */
/* Draw */
{float bg[4];
nk_color_fv(bg, background);
XGetWindowAttributes(win.dpy, win.win, &win.attr);
glViewport(0, 0, win.width, win.height);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(bg[0], bg[1], bg[2], bg[3]);
/* IMPORTANT: `nk_x11_render` modifies some global OpenGL state
* with blending, scissor, face culling, depth test and viewport and
* defaults everything back into a default state.
* Make sure to either a.) save and restore or b.) reset your own state after
* rendering the UI. */
nk_x11_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
glXSwapBuffers(win.dpy, win.win);}
}
nk_x11_shutdown();
glXMakeCurrent(win.dpy, 0, 0);
glXDestroyContext(win.dpy, glContext);
XUnmapWindow(win.dpy, win.win);
XFreeColormap(win.dpy, win.cmap);
XDestroyWindow(win.dpy, win.win);
XCloseDisplay(win.dpy);
return 0;
}

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demo/x11_opengl3/nuklear_x11.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#include <X11/Xlocale.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glext.h>
#include <GL/glxext.h>
#define NK_IMPLEMENTATION
#include "nuklear_x11.h"
#include "../../nuklear.h"
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#if NK_X11_LOAD_OPENGL_EXTENSIONS
/* GL_ARB_vertex_buffer_object */
typedef void(*qglGenBuffers)(GLsizei, GLuint*);
typedef void(*qglBindBuffer)(GLenum, GLuint);
typedef void(*qglBufferData)(GLenum, GLsizeiptr, const GLvoid*, GLenum);
typedef void(*qglBufferSubData)(GLenum, GLintptr, GLsizeiptr, const GLvoid*);
typedef void*(*qglMapBuffer)(GLenum, GLenum);
typedef GLboolean(*qglUnmapBuffer)(GLenum);
typedef void(*qglDeleteBuffers)(GLsizei, GLuint*);
/* GL_ARB_vertex_array_object */
typedef void (*qglGenVertexArrays)(GLsizei, GLuint*);
typedef void (*qglBindVertexArray)(GLuint);
typedef void (*qglDeleteVertexArrays)(GLsizei, const GLuint*);
/* GL_ARB_vertex_program / GL_ARB_fragment_program */
typedef void(*qglVertexAttribPointer)(GLuint, GLint, GLenum, GLboolean, GLsizei, const GLvoid*);
typedef void(*qglEnableVertexAttribArray)(GLuint);
typedef void(*qglDisableVertexAttribArray)(GLuint);
/* GL_ARB_framebuffer_object */
typedef void(*qglGenerateMipmap)(GLenum target);
/* GLSL/OpenGL 2.0 core */
typedef GLuint(*qglCreateShader)(GLenum);
typedef void(*qglShaderSource)(GLuint, GLsizei, const GLchar**, const GLint*);
typedef void(*qglCompileShader)(GLuint);
typedef void(*qglGetShaderiv)(GLuint, GLenum, GLint*);
typedef void(*qglGetShaderInfoLog)(GLuint, GLsizei, GLsizei*, GLchar*);
typedef void(*qglDeleteShader)(GLuint);
typedef GLuint(*qglCreateProgram)(void);
typedef void(*qglAttachShader)(GLuint, GLuint);
typedef void(*qglDetachShader)(GLuint, GLuint);
typedef void(*qglLinkProgram)(GLuint);
typedef void(*qglUseProgram)(GLuint);
typedef void(*qglGetProgramiv)(GLuint, GLenum, GLint*);
typedef void(*qglGetProgramInfoLog)(GLuint, GLsizei, GLsizei*, GLchar*);
typedef void(*qglDeleteProgram)(GLuint);
typedef GLint(*qglGetUniformLocation)(GLuint, const GLchar*);
typedef GLint(*qglGetAttribLocation)(GLuint, const GLchar*);
typedef void(*qglUniform1i)(GLint, GLint);
typedef void(*qglUniform1f)(GLint, GLfloat);
typedef void(*qglUniformMatrix3fv)(GLint, GLsizei, GLboolean, const GLfloat*);
typedef void(*qglUniformMatrix4fv)(GLint, GLsizei, GLboolean, const GLfloat*);
static qglGenBuffers glGenBuffers;
static qglBindBuffer glBindBuffer;
static qglBufferData glBufferData;
static qglBufferSubData glBufferSubData;
static qglMapBuffer glMapBuffer;
static qglUnmapBuffer glUnmapBuffer;
static qglDeleteBuffers glDeleteBuffers;
static qglGenVertexArrays glGenVertexArrays;
static qglBindVertexArray glBindVertexArray;
static qglDeleteVertexArrays glDeleteVertexArrays;
static qglVertexAttribPointer glVertexAttribPointer;
static qglEnableVertexAttribArray glEnableVertexAttribArray;
static qglDisableVertexAttribArray glDisableVertexAttribArray;
static qglGenerateMipmap glGenerateMipmap;
static qglCreateShader glCreateShader;
static qglShaderSource glShaderSource;
static qglCompileShader glCompileShader;
static qglGetShaderiv glGetShaderiv;
static qglGetShaderInfoLog glGetShaderInfoLog;
static qglDeleteShader glDeleteShader;
static qglCreateProgram glCreateProgram;
static qglAttachShader glAttachShader;
static qglDetachShader glDetachShader;
static qglLinkProgram glLinkProgram;
static qglUseProgram glUseProgram;
static qglGetProgramiv glGetProgramiv;
static qglGetProgramInfoLog glGetProgramInfoLog;
static qglDeleteProgram glDeleteProgram;
static qglGetUniformLocation glGetUniformLocation;
static qglGetAttribLocation glGetAttribLocation;
static qglUniform1i glUniform1i;
static qglUniform1f glUniform1f;
static qglUniformMatrix3fv glUniformMatrix3fv;
static qglUniformMatrix4fv glUniformMatrix4fv;
enum graphics_card_vendors {
VENDOR_UNKNOWN,
VENDOR_NVIDIA,
VENDOR_AMD,
VENDOR_INTEL
};
struct opengl_info {
/* info */
const char *vendor_str;
const char *version_str;
const char *extensions_str;
const char *renderer_str;
const char *glsl_version_str;
enum graphics_card_vendors vendor;
/* version */
float version;
int major_version;
int minor_version;
/* extensions */
int glsl_available;
int vertex_buffer_obj_available;
int vertex_array_obj_available;
int map_buffer_range_available;
int fragment_program_available;
int frame_buffer_object_available;
};
#endif
struct nk_x11_device {
#if NK_X11_LOAD_OPENGL_EXTENSIONS
struct opengl_info info;
#endif
struct nk_buffer cmds;
struct nk_draw_null_texture null;
GLuint vbo, vao, ebo;
GLuint prog;
GLuint vert_shdr;
GLuint frag_shdr;
GLint attrib_pos;
GLint attrib_uv;
GLint attrib_col;
GLint uniform_tex;
GLint uniform_proj;
GLuint font_tex;
};
static struct nk_x11 {
struct nk_x11_device ogl;
struct nk_context ctx;
struct nk_font_atlas atlas;
Display *dpy;
Window win;
} x11;
#ifdef __APPLE__
#define NK_SHADER_VERSION "#version 150\n"
#else
#define NK_SHADER_VERSION "#version 300 es\n"
#endif
#if NK_X11_LOAD_OPENGL_EXTENSIONS
NK_INTERN int
nk_x11_stricmpn(const char *a, const char *b, int len)
{
int i = 0;
for (i = 0; i < len && a[i] && b[i]; ++i)
if (a[i] != b[i]) return 1;
if (i != len) return 1;
return 0;
}
NK_INTERN int
nk_x11_check_extension(struct opengl_info *GL, const char *ext)
{
const char *start, *where, *term;
where = strchr(ext, ' ');
if (where || *ext == '\0')
return FALSE;
for (start = GL->extensions_str;;) {
where = strstr((const char*)start, ext);
if (!where) break;
term = where + strlen(ext);
if (where == start || *(where - 1) == ' ') {
if (*term == ' ' || *term == '\0')
return TRUE;
}
start = term;
}
return FALSE;
}
#define GL_EXT(name) (q##name)nk_gl_ext(#name)
NK_INTERN __GLXextFuncPtr
nk_gl_ext(const char *name)
{
__GLXextFuncPtr func;
func = glXGetProcAddress((const GLubyte*)name);
if (!func) {
fprintf(stdout, "[GL]: failed to load extension: %s", name);
return NULL;
}
return func;
}
NK_INTERN int
nk_load_opengl(struct opengl_info *gl)
{
int failed = FALSE;
gl->version_str = (const char*)glGetString(GL_VERSION);
glGetIntegerv(GL_MAJOR_VERSION, &gl->major_version);
glGetIntegerv(GL_MINOR_VERSION, &gl->minor_version);
if (gl->major_version < 2) {
fprintf(stderr, "[GL]: Graphics card does not fullfill minimum OpenGL 2.0 support\n");
return 0;
}
gl->version = (float)gl->major_version + (float)gl->minor_version * 0.1f;
gl->renderer_str = (const char*)glGetString(GL_RENDERER);
gl->extensions_str = (const char*)glGetString(GL_EXTENSIONS);
gl->glsl_version_str = (const char*)glGetString(GL_SHADING_LANGUAGE_VERSION);
gl->vendor_str = (const char*)glGetString(GL_VENDOR);
if (!nk_x11_stricmpn(gl->vendor_str, "ATI", 4) ||
!nk_x11_stricmpn(gl->vendor_str, "AMD", 4))
gl->vendor = VENDOR_AMD;
else if (!nk_x11_stricmpn(gl->vendor_str, "NVIDIA", 6))
gl->vendor = VENDOR_NVIDIA;
else if (!nk_x11_stricmpn(gl->vendor_str, "Intel", 5))
gl->vendor = VENDOR_INTEL;
else gl->vendor = VENDOR_UNKNOWN;
/* Extensions */
gl->glsl_available = (gl->version >= 2.0f);
if (gl->glsl_available) {
/* GLSL core in OpenGL > 2 */
glCreateShader = GL_EXT(glCreateShader);
glShaderSource = GL_EXT(glShaderSource);
glCompileShader = GL_EXT(glCompileShader);
glGetShaderiv = GL_EXT(glGetShaderiv);
glGetShaderInfoLog = GL_EXT(glGetShaderInfoLog);
glDeleteShader = GL_EXT(glDeleteShader);
glCreateProgram = GL_EXT(glCreateProgram);
glAttachShader = GL_EXT(glAttachShader);
glDetachShader = GL_EXT(glDetachShader);
glLinkProgram = GL_EXT(glLinkProgram);
glUseProgram = GL_EXT(glUseProgram);
glGetProgramiv = GL_EXT(glGetProgramiv);
glGetProgramInfoLog = GL_EXT(glGetProgramInfoLog);
glDeleteProgram = GL_EXT(glDeleteProgram);
glGetUniformLocation = GL_EXT(glGetUniformLocation);
glGetAttribLocation = GL_EXT(glGetAttribLocation);
glUniform1i = GL_EXT(glUniform1i);
glUniform1f = GL_EXT(glUniform1f);
glUniformMatrix3fv = GL_EXT(glUniformMatrix3fv);
glUniformMatrix4fv = GL_EXT(glUniformMatrix4fv);
}
gl->vertex_buffer_obj_available = nk_x11_check_extension(gl, "GL_ARB_vertex_buffer_object");
if (gl->vertex_buffer_obj_available) {
/* GL_ARB_vertex_buffer_object */
glGenBuffers = GL_EXT(glGenBuffers);
glBindBuffer = GL_EXT(glBindBuffer);
glBufferData = GL_EXT(glBufferData);
glBufferSubData = GL_EXT(glBufferSubData);
glMapBuffer = GL_EXT(glMapBuffer);
glUnmapBuffer = GL_EXT(glUnmapBuffer);
glDeleteBuffers = GL_EXT(glDeleteBuffers);
}
gl->fragment_program_available = nk_x11_check_extension(gl, "GL_ARB_fragment_program");
if (gl->fragment_program_available) {
/* GL_ARB_vertex_program / GL_ARB_fragment_program */
glVertexAttribPointer = GL_EXT(glVertexAttribPointer);
glEnableVertexAttribArray = GL_EXT(glEnableVertexAttribArray);
glDisableVertexAttribArray = GL_EXT(glDisableVertexAttribArray);
}
gl->vertex_array_obj_available = nk_x11_check_extension(gl, "GL_ARB_vertex_array_object");
if (gl->vertex_array_obj_available) {
/* GL_ARB_vertex_array_object */
glGenVertexArrays = GL_EXT(glGenVertexArrays);
glBindVertexArray = GL_EXT(glBindVertexArray);
glDeleteVertexArrays = GL_EXT(glDeleteVertexArrays);
}
gl->frame_buffer_object_available = nk_x11_check_extension(gl, "GL_ARB_framebuffer_object");
if (gl->frame_buffer_object_available) {
/* GL_ARB_framebuffer_object */
glGenerateMipmap = GL_EXT(glGenerateMipmap);
}
if (!gl->vertex_buffer_obj_available) {
fprintf(stdout, "[GL] Error: GL_ARB_vertex_buffer_object is not available!\n");
failed = TRUE;
}
if (!gl->fragment_program_available) {
fprintf(stdout, "[GL] Error: GL_ARB_fragment_program is not available!\n");
failed = TRUE;
}
if (!gl->vertex_array_obj_available) {
fprintf(stdout, "[GL] Error: GL_ARB_vertex_array_object is not available!\n");
failed = TRUE;
}
if (!gl->frame_buffer_object_available) {
fprintf(stdout, "[GL] Error: GL_ARB_framebuffer_object is not available!\n");
failed = TRUE;
}
return !failed;
}
#endif
NK_API int
nk_x11_device_create(void)
{
GLint status;
static const GLchar *vertex_shader =
NK_SHADER_VERSION
"uniform mat4 ProjMtx;\n"
"in vec2 Position;\n"
"in vec2 TexCoord;\n"
"in vec4 Color;\n"
"out vec2 Frag_UV;\n"
"out vec4 Frag_Color;\n"
"void main() {\n"
" Frag_UV = TexCoord;\n"
" Frag_Color = Color;\n"
" gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
"}\n";
static const GLchar *fragment_shader =
NK_SHADER_VERSION
"precision mediump float;\n"
"uniform sampler2D Texture;\n"
"in vec2 Frag_UV;\n"
"in vec4 Frag_Color;\n"
"out vec4 Out_Color;\n"
"void main(){\n"
" Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
"}\n";
struct nk_x11_device *dev = &x11.ogl;
#if NK_X11_LOAD_OPENGL_EXTENSIONS
if (!nk_load_opengl(&dev->info)) return 0;
#endif
nk_buffer_init_default(&dev->cmds);
dev->prog = glCreateProgram();
dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
glCompileShader(dev->vert_shdr);
glCompileShader(dev->frag_shdr);
glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
assert(status == GL_TRUE);
glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
assert(status == GL_TRUE);
glAttachShader(dev->prog, dev->vert_shdr);
glAttachShader(dev->prog, dev->frag_shdr);
glLinkProgram(dev->prog);
glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
assert(status == GL_TRUE);
dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
{
/* buffer setup */
GLsizei vs = sizeof(struct nk_draw_vertex);
size_t vp = offsetof(struct nk_draw_vertex, position);
size_t vt = offsetof(struct nk_draw_vertex, uv);
size_t vc = offsetof(struct nk_draw_vertex, col);
glGenBuffers(1, &dev->vbo);
glGenBuffers(1, &dev->ebo);
glGenVertexArrays(1, &dev->vao);
glBindVertexArray(dev->vao);
glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
glEnableVertexAttribArray((GLuint)dev->attrib_pos);
glEnableVertexAttribArray((GLuint)dev->attrib_uv);
glEnableVertexAttribArray((GLuint)dev->attrib_col);
glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
}
glBindTexture(GL_TEXTURE_2D, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
return 1;
}
NK_INTERN void
nk_x11_device_upload_atlas(const void *image, int width, int height)
{
struct nk_x11_device *dev = &x11.ogl;
glGenTextures(1, &dev->font_tex);
glBindTexture(GL_TEXTURE_2D, dev->font_tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, image);
}
NK_API void
nk_x11_device_destroy(void)
{
struct nk_x11_device *dev = &x11.ogl;
glDetachShader(dev->prog, dev->vert_shdr);
glDetachShader(dev->prog, dev->frag_shdr);
glDeleteShader(dev->vert_shdr);
glDeleteShader(dev->frag_shdr);
glDeleteProgram(dev->prog);
glDeleteTextures(1, &dev->font_tex);
glDeleteBuffers(1, &dev->vbo);
glDeleteBuffers(1, &dev->ebo);
nk_buffer_free(&dev->cmds);
}
NK_API void
nk_x11_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
{
int width, height;
XWindowAttributes attr;
struct nk_x11_device *dev = &x11.ogl;
GLfloat ortho[4][4] = {
{2.0f, 0.0f, 0.0f, 0.0f},
{0.0f,-2.0f, 0.0f, 0.0f},
{0.0f, 0.0f,-1.0f, 0.0f},
{-1.0f,1.0f, 0.0f, 1.0f},
};
XGetWindowAttributes(x11.dpy, x11.win, &attr);
width = attr.width;
height = attr.height;
ortho[0][0] /= (GLfloat)width;
ortho[1][1] /= (GLfloat)height;
/* setup global state */
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
glActiveTexture(GL_TEXTURE0);
/* setup program */
glUseProgram(dev->prog);
glUniform1i(dev->uniform_tex, 0);
glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
glViewport(0,0,(GLsizei)width,(GLsizei)height);
{
/* convert from command queue into draw list and draw to screen */
const struct nk_draw_command *cmd;
void *vertices, *elements;
const nk_draw_index *offset = NULL;
/* allocate vertex and element buffer */
glBindVertexArray(dev->vao);
glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
glBufferData(GL_ARRAY_BUFFER, max_vertex_buffer, NULL, GL_STREAM_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, max_element_buffer, NULL, GL_STREAM_DRAW);
/* load draw vertices & elements directly into vertex + element buffer */
vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
{
/* fill converting configuration */
struct nk_convert_config config;
memset(&config, 0, sizeof(config));
config.global_alpha = 1.0f;
config.shape_AA = AA;
config.line_AA = AA;
config.circle_segment_count = 22;
config.curve_segment_count = 22;
config.arc_segment_count = 22;
config.null = dev->null;
/* setup buffers to load vertices and elements */
{struct nk_buffer vbuf, ebuf;
nk_buffer_init_fixed(&vbuf, vertices, (size_t)max_vertex_buffer);
nk_buffer_init_fixed(&ebuf, elements, (size_t)max_element_buffer);
nk_convert(&x11.ctx, &dev->cmds, &vbuf, &ebuf, &config);}
}
glUnmapBuffer(GL_ARRAY_BUFFER);
glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
/* iterate over and execute each draw command */
nk_draw_foreach(cmd, &x11.ctx, &dev->cmds)
{
if (!cmd->elem_count) continue;
glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
glScissor(
(GLint)(cmd->clip_rect.x),
(GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
(GLint)(cmd->clip_rect.w),
(GLint)(cmd->clip_rect.h));
glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
offset += cmd->elem_count;
}
nk_clear(&x11.ctx);
}
/* default OpenGL state */
glUseProgram(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glDisable(GL_BLEND);
glDisable(GL_SCISSOR_TEST);
}
NK_API void
nk_x11_font_stash_begin(struct nk_font_atlas **atlas)
{
nk_font_atlas_init_default(&x11.atlas);
nk_font_atlas_begin(&x11.atlas);
*atlas = &x11.atlas;
}
NK_API void
nk_x11_font_stash_end(void)
{
const void *image; int w, h;
image = nk_font_atlas_bake(&x11.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
nk_x11_device_upload_atlas(image, w, h);
nk_font_atlas_end(&x11.atlas, nk_handle_id((int)x11.ogl.font_tex), &x11.ogl.null);
if (x11.atlas.default_font)
nk_style_set_font(&x11.ctx, &x11.atlas.default_font->handle);
}
NK_API void
nk_x11_handle_event(XEvent *evt)
{
struct nk_context *ctx = &x11.ctx;
if (evt->type == KeyPress || evt->type == KeyRelease)
{
/* Key handler */
int ret, down = (evt->type == KeyPress);
KeySym *code = XGetKeyboardMapping(x11.dpy, (KeyCode)evt->xkey.keycode, 1, &ret);
if (*code == XK_Shift_L || *code == XK_Shift_R) nk_input_key(ctx, NK_KEY_SHIFT, down);
else if (*code == XK_Delete) nk_input_key(ctx, NK_KEY_DEL, down);
else if (*code == XK_Return) nk_input_key(ctx, NK_KEY_ENTER, down);
else if (*code == XK_Tab) nk_input_key(ctx, NK_KEY_TAB, down);
else if (*code == XK_Left) nk_input_key(ctx, NK_KEY_LEFT, down);
else if (*code == XK_Right) nk_input_key(ctx, NK_KEY_RIGHT, down);
else if (*code == XK_BackSpace) nk_input_key(ctx, NK_KEY_BACKSPACE, down);
else if (*code == XK_Home) nk_input_key(ctx, NK_KEY_TEXT_START, down);
else if (*code == XK_End) nk_input_key(ctx, NK_KEY_TEXT_END, down);
else if (*code == XK_space && !down) nk_input_char(ctx, ' ');
else {
if (*code == 'c' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_COPY, down);
else if (*code == 'v' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_PASTE, down);
else if (*code == 'x' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_CUT, down);
else if (*code == 'z' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_UNDO, down);
else if (*code == 'r' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_REDO, down);
else if (*code == XK_Left && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
else if (*code == XK_Right && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
else if (*code == 'b' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down);
else if (*code == 'e' && (evt->xkey.state & ControlMask))
nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down);
else if (!down) {
char buf[32];
KeySym keysym = 0;
if (XLookupString((XKeyEvent*)evt, buf, 32, &keysym, NULL) != NoSymbol)
nk_input_glyph(ctx, buf);
}
}
XFree(code);
} else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
/* Button handler */
int down = (evt->type == ButtonPress);
const int x = evt->xbutton.x, y = evt->xbutton.y;
if (evt->xbutton.button == Button1)
nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
if (evt->xbutton.button == Button2)
nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
else if (evt->xbutton.button == Button3)
nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
else if (evt->xbutton.button == Button4)
nk_input_scroll(ctx, 1.0f);
else if (evt->xbutton.button == Button5)
nk_input_scroll(ctx, -1.0f);
} else if (evt->type == MotionNotify) {
/* Mouse motion handler */
const int x = evt->xmotion.x, y = evt->xmotion.y;
nk_input_motion(ctx, x, y);
} else if (evt->type == KeymapNotify)
XRefreshKeyboardMapping(&evt->xmapping);
}
NK_API struct nk_context*
nk_x11_init(Display *dpy, Window win)
{
if (!setlocale(LC_ALL,"")) return 0;
if (!XSupportsLocale()) return 0;
if (!XSetLocaleModifiers("@im=none")) return 0;
if (!nk_x11_device_create()) return 0;
x11.dpy = dpy;
x11.win = win;
nk_init_default(&x11.ctx, 0);
return &x11.ctx;
}
NK_API void
nk_x11_shutdown(void)
{
nk_font_atlas_clear(&x11.atlas);
nk_free(&x11.ctx);
nk_x11_device_destroy();
memset(&x11, 0, sizeof(x11));
}

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demo/x11_opengl3/nuklear_x11.h Normal file
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#ifndef NK_X11_OPENGL_H_
#define NK_X11_OPENGL_H_
#include "../../nuklear.h"
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
/* Define this to 0 if you already load all required OpenGL extensions yourself
* otherwise define to 1 to let nuklear load its required extensions. */
#define NK_X11_LOAD_OPENGL_EXTENSIONS 1
NK_API struct nk_context *nk_x11_init(Display *dpy, Window win);
NK_API void nk_x11_font_stash_begin(struct nk_font_atlas **atlas);
NK_API void nk_x11_font_stash_end(void);
NK_API void nk_x11_handle_event(XEvent *evt);
NK_API void nk_x11_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
NK_API void nk_x11_shutdown(void);
NK_API int nk_x11_device_create(void);
NK_API void nk_x11_device_destroy(void);
#endif