diff options
Diffstat (limited to 'nuklear/demo/x11_opengl2/nuklear_xlib_gl2.h')
| -rw-r--r-- | nuklear/demo/x11_opengl2/nuklear_xlib_gl2.h | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/nuklear/demo/x11_opengl2/nuklear_xlib_gl2.h b/nuklear/demo/x11_opengl2/nuklear_xlib_gl2.h new file mode 100644 index 0000000..a814455 --- /dev/null +++ b/nuklear/demo/x11_opengl2/nuklear_xlib_gl2.h @@ -0,0 +1,357 @@ +/* + * Nuklear - v1.17 - public domain + * no warrenty implied; use at your own risk. + * authored from 2015-2016 by Micha Mettke + */ +/* + * ============================================================== + * + * API + * + * =============================================================== + */ +#ifndef NK_XLIB_GL3_H_ +#define NK_XLIB_GL3_H_ + +#include <X11/Xlib.h> +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 int 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); + +#endif +/* + * ============================================================== + * + * IMPLEMENTATION + * + * =============================================================== + */ +#ifdef NK_XLIB_GL2_IMPLEMENTATION +#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> + +#ifndef FALSE +#define FALSE 0 +#endif +#ifndef TRUE +#define TRUE 1 +#endif + +struct nk_x11_vertex { + float position[2]; + float uv[2]; + nk_byte col[4]; +}; + +struct nk_x11_device { + struct nk_buffer cmds; + struct nk_draw_null_texture null; + GLuint font_tex; +}; + +static struct nk_x11 { + struct nk_x11_device ogl; + struct nk_context ctx; + struct nk_font_atlas atlas; + Cursor cursor; + Display *dpy; + Window win; +} x11; + +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_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer) +{ + /* setup global state */ + struct nk_x11_device *dev = &x11.ogl; + int width, height; + + XWindowAttributes attr; + XGetWindowAttributes(x11.dpy, x11.win, &attr); + width = attr.width; + height = attr.height; + + glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT|GL_TRANSFORM_BIT); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glEnable(GL_BLEND); + glEnable(GL_TEXTURE_2D); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + + /* setup viewport/project */ + glViewport(0,0,(GLsizei)width,(GLsizei)height); + glMatrixMode(GL_PROJECTION); + glPushMatrix(); + glLoadIdentity(); + glOrtho(0.0f, width, height, 0.0f, -1.0f, 1.0f); + glMatrixMode(GL_MODELVIEW); + glPushMatrix(); + glLoadIdentity(); + + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + glEnableClientState(GL_COLOR_ARRAY); + { + GLsizei vs = sizeof(struct nk_x11_vertex); + size_t vp = offsetof(struct nk_x11_vertex, position); + size_t vt = offsetof(struct nk_x11_vertex, uv); + size_t vc = offsetof(struct nk_x11_vertex, col); + + /* convert from command queue into draw list and draw to screen */ + const struct nk_draw_command *cmd; + const nk_draw_index *offset = NULL; + struct nk_buffer vbuf, ebuf; + + /* fill convert configuration */ + struct nk_convert_config config; + static const struct nk_draw_vertex_layout_element vertex_layout[] = { + {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_x11_vertex, position)}, + {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_x11_vertex, uv)}, + {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_x11_vertex, col)}, + {NK_VERTEX_LAYOUT_END} + }; + NK_MEMSET(&config, 0, sizeof(config)); + config.vertex_layout = vertex_layout; + config.vertex_size = sizeof(struct nk_x11_vertex); + config.vertex_alignment = NK_ALIGNOF(struct nk_x11_vertex); + config.null = dev->null; + config.circle_segment_count = 22; + config.curve_segment_count = 22; + config.arc_segment_count = 22; + config.global_alpha = 1.0f; + config.shape_AA = AA; + config.line_AA = AA; + + /* convert shapes into vertexes */ + nk_buffer_init_default(&vbuf); + nk_buffer_init_default(&ebuf); + nk_convert(&x11.ctx, &dev->cmds, &vbuf, &ebuf, &config); + + /* setup vertex buffer pointer */ + {const void *vertices = nk_buffer_memory_const(&vbuf); + glVertexPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vp)); + glTexCoordPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vt)); + glColorPointer(4, GL_UNSIGNED_BYTE, vs, (const void*)((const nk_byte*)vertices + vc));} + + /* iterate over and execute each draw command */ + offset = (const nk_draw_index*)nk_buffer_memory_const(&ebuf); + 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); + nk_buffer_free(&vbuf); + nk_buffer_free(&ebuf); + } + + /* default OpenGL state */ + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); + glDisableClientState(GL_COLOR_ARRAY); + + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glDisable(GL_SCISSOR_TEST); + glDisable(GL_BLEND); + glDisable(GL_TEXTURE_2D); + + glBindTexture(GL_TEXTURE_2D, 0); + glMatrixMode(GL_MODELVIEW); + glPopMatrix(); + glMatrixMode(GL_PROJECTION); + glPopMatrix(); + glPopAttrib(); + +} + +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 int +nk_x11_handle_event(XEvent *evt) +{ + struct nk_context *ctx = &x11.ctx; + + /* optional grabbing behavior */ + if (ctx->input.mouse.grab) { + XDefineCursor(x11.dpy, x11.win, x11.cursor); + ctx->input.mouse.grab = 0; + } else if (ctx->input.mouse.ungrab) { + XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0, + (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y); + XUndefineCursor(x11.dpy, x11.win); + ctx->input.mouse.ungrab = 0; + } + + 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_Up) nk_input_key(ctx, NK_KEY_UP, down); + else if (*code == XK_Down) nk_input_key(ctx, NK_KEY_DOWN, down); + else if (*code == XK_BackSpace) nk_input_key(ctx, NK_KEY_BACKSPACE, down); + else if (*code == XK_space && !down) nk_input_char(ctx, ' '); + else if (*code == XK_Page_Up) nk_input_key(ctx, NK_KEY_SCROLL_UP, down); + else if (*code == XK_Page_Down) nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down); + else if (*code == XK_Home) { + nk_input_key(ctx, NK_KEY_TEXT_START, down); + nk_input_key(ctx, NK_KEY_SCROLL_START, down); + } else if (*code == XK_End) { + nk_input_key(ctx, NK_KEY_TEXT_END, down); + nk_input_key(ctx, NK_KEY_SCROLL_END, down); + } 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 (*code == 'i') + nk_input_key(ctx, NK_KEY_TEXT_INSERT_MODE, down); + else if (*code == 'r') + nk_input_key(ctx, NK_KEY_TEXT_REPLACE_MODE, down); + if (down) { + char buf[32]; + KeySym keysym = 0; + if (XLookupString((XKeyEvent*)evt, buf, 32, &keysym, NULL) != NoSymbol) + nk_input_glyph(ctx, buf); + } + } + } + XFree(code); + return 1; + } 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 return 0; + return 1; + } else if (evt->type == MotionNotify) { + /* Mouse motion handler */ + const int x = evt->xmotion.x, y = evt->xmotion.y; + nk_input_motion(ctx, x, y); + if (ctx->input.mouse.grabbed) { + ctx->input.mouse.pos.x = ctx->input.mouse.prev.x; + ctx->input.mouse.pos.y = ctx->input.mouse.prev.y; + XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0, (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y); + } + return 1; + } else if (evt->type == KeymapNotify) { + XRefreshKeyboardMapping(&evt->xmapping); + return 1; + } + return 0; +} + +NK_API struct nk_context* +nk_x11_init(Display *dpy, Window win) +{ + x11.dpy = dpy; + x11.win = win; + + if (!setlocale(LC_ALL,"")) return 0; + if (!XSupportsLocale()) return 0; + if (!XSetLocaleModifiers("@im=none")) return 0; + + /* create invisible cursor */ + {static XColor dummy; char data[1] = {0}; + Pixmap blank = XCreateBitmapFromData(dpy, win, data, 1, 1); + if (blank == None) return 0; + x11.cursor = XCreatePixmapCursor(dpy, blank, blank, &dummy, &dummy, 0, 0); + XFreePixmap(dpy, blank);} + + nk_buffer_init_default(&x11.ogl.cmds); + nk_init_default(&x11.ctx, 0); + return &x11.ctx; +} + +NK_API void +nk_x11_shutdown(void) +{ + struct nk_x11_device *dev = &x11.ogl; + nk_font_atlas_clear(&x11.atlas); + nk_free(&x11.ctx); + glDeleteTextures(1, &dev->font_tex); + nk_buffer_free(&dev->cmds); + XFreeCursor(x11.dpy, x11.cursor); + memset(&x11, 0, sizeof(x11)); +} + +#endif |