378 lines
14 KiB
C
378 lines
14 KiB
C
/*
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* Nuklear - 1.32.0 - public domain
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* no warrenty implied; use at your own risk.
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* authored from 2015-2016 by Micha Mettke
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*/
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/*
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* ==============================================================
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*
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* API
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*
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* ===============================================================
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*/
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#ifndef NK_XLIB_GL2_H_
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#define NK_XLIB_GL2_H_
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#include <X11/Xlib.h>
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NK_API struct nk_context* nk_x11_init(Display *dpy, Window win);
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NK_API void nk_x11_font_stash_begin(struct nk_font_atlas **atlas);
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NK_API void nk_x11_font_stash_end(void);
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NK_API int nk_x11_handle_event(XEvent *evt);
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NK_API void nk_x11_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
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NK_API void nk_x11_shutdown(void);
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#endif
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/*
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* ==============================================================
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*
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* IMPLEMENTATION
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*
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* ===============================================================
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*/
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#ifdef NK_XLIB_GL2_IMPLEMENTATION
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <time.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <X11/Xresource.h>
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#include <X11/Xlocale.h>
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#include <GL/gl.h>
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#ifndef NK_X11_DOUBLE_CLICK_LO
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#define NK_X11_DOUBLE_CLICK_LO 20
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#endif
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#ifndef NK_X11_DOUBLE_CLICK_HI
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#define NK_X11_DOUBLE_CLICK_HI 200
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#endif
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struct nk_x11_vertex {
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float position[2];
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float uv[2];
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nk_byte col[4];
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};
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struct nk_x11_device {
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struct nk_buffer cmds;
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struct nk_draw_null_texture null;
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GLuint font_tex;
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};
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static struct nk_x11 {
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struct nk_x11_device ogl;
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struct nk_context ctx;
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struct nk_font_atlas atlas;
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Cursor cursor;
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Display *dpy;
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Window win;
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long last_button_click;
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} x11;
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NK_INTERN long
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nk_timestamp(void)
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{
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struct timeval tv;
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if (gettimeofday(&tv, NULL) < 0) return 0;
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return (long)((long)tv.tv_sec * 1000 + (long)tv.tv_usec/1000);
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}
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NK_INTERN void
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nk_x11_device_upload_atlas(const void *image, int width, int height)
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{
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struct nk_x11_device *dev = &x11.ogl;
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glGenTextures(1, &dev->font_tex);
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glBindTexture(GL_TEXTURE_2D, dev->font_tex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image);
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}
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NK_API void
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nk_x11_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
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{
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/* setup global state */
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struct nk_x11_device *dev = &x11.ogl;
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int width, height;
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XWindowAttributes attr;
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XGetWindowAttributes(x11.dpy, x11.win, &attr);
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width = attr.width;
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height = attr.height;
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glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT|GL_TRANSFORM_BIT);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_SCISSOR_TEST);
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glEnable(GL_BLEND);
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glEnable(GL_TEXTURE_2D);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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/* setup viewport/project */
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glViewport(0,0,(GLsizei)width,(GLsizei)height);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glEnableClientState(GL_COLOR_ARRAY);
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{
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GLsizei vs = sizeof(struct nk_x11_vertex);
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size_t vp = offsetof(struct nk_x11_vertex, position);
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size_t vt = offsetof(struct nk_x11_vertex, uv);
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size_t vc = offsetof(struct nk_x11_vertex, col);
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/* convert from command queue into draw list and draw to screen */
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const struct nk_draw_command *cmd;
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const nk_draw_index *offset = NULL;
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struct nk_buffer vbuf, ebuf;
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/* fill convert configuration */
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struct nk_convert_config config;
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static const struct nk_draw_vertex_layout_element vertex_layout[] = {
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{NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_x11_vertex, position)},
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{NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_x11_vertex, uv)},
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{NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_x11_vertex, col)},
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{NK_VERTEX_LAYOUT_END}
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};
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NK_MEMSET(&config, 0, sizeof(config));
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config.vertex_layout = vertex_layout;
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config.vertex_size = sizeof(struct nk_x11_vertex);
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config.vertex_alignment = NK_ALIGNOF(struct nk_x11_vertex);
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config.null = dev->null;
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config.circle_segment_count = 22;
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config.curve_segment_count = 22;
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config.arc_segment_count = 22;
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config.global_alpha = 1.0f;
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config.shape_AA = AA;
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config.line_AA = AA;
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/* convert shapes into vertexes */
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nk_buffer_init_default(&vbuf);
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nk_buffer_init_default(&ebuf);
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nk_convert(&x11.ctx, &dev->cmds, &vbuf, &ebuf, &config);
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/* setup vertex buffer pointer */
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{const void *vertices = nk_buffer_memory_const(&vbuf);
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glVertexPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vp));
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glTexCoordPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vt));
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glColorPointer(4, GL_UNSIGNED_BYTE, vs, (const void*)((const nk_byte*)vertices + vc));}
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/* iterate over and execute each draw command */
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offset = (const nk_draw_index*)nk_buffer_memory_const(&ebuf);
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nk_draw_foreach(cmd, &x11.ctx, &dev->cmds)
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{
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if (!cmd->elem_count) continue;
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glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
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glScissor(
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(GLint)(cmd->clip_rect.x),
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(GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
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(GLint)(cmd->clip_rect.w),
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(GLint)(cmd->clip_rect.h));
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glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
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offset += cmd->elem_count;
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}
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nk_clear(&x11.ctx);
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nk_buffer_free(&vbuf);
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nk_buffer_free(&ebuf);
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}
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/* default OpenGL state */
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glDisableClientState(GL_VERTEX_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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glDisableClientState(GL_COLOR_ARRAY);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_SCISSOR_TEST);
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glDisable(GL_BLEND);
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glDisable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, 0);
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glPopAttrib();
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}
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NK_API void
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nk_x11_font_stash_begin(struct nk_font_atlas **atlas)
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{
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nk_font_atlas_init_default(&x11.atlas);
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nk_font_atlas_begin(&x11.atlas);
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*atlas = &x11.atlas;
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}
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NK_API void
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nk_x11_font_stash_end(void)
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{
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const void *image; int w, h;
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image = nk_font_atlas_bake(&x11.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
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nk_x11_device_upload_atlas(image, w, h);
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nk_font_atlas_end(&x11.atlas, nk_handle_id((int)x11.ogl.font_tex), &x11.ogl.null);
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if (x11.atlas.default_font)
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nk_style_set_font(&x11.ctx, &x11.atlas.default_font->handle);
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}
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NK_API int
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nk_x11_handle_event(XEvent *evt)
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{
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struct nk_context *ctx = &x11.ctx;
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/* optional grabbing behavior */
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if (ctx->input.mouse.grab) {
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XDefineCursor(x11.dpy, x11.win, x11.cursor);
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ctx->input.mouse.grab = 0;
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} else if (ctx->input.mouse.ungrab) {
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XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0,
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(int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
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XUndefineCursor(x11.dpy, x11.win);
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ctx->input.mouse.ungrab = 0;
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}
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if (evt->type == KeyPress || evt->type == KeyRelease)
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{
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/* Key handler */
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int ret, down = (evt->type == KeyPress);
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KeySym *code = XGetKeyboardMapping(x11.dpy, (KeyCode)evt->xkey.keycode, 1, &ret);
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if (*code == XK_Shift_L || *code == XK_Shift_R) nk_input_key(ctx, NK_KEY_SHIFT, down);
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else if (*code == XK_Control_L || *code == XK_Control_R) nk_input_key(ctx, NK_KEY_CTRL, down);
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else if (*code == XK_Delete) nk_input_key(ctx, NK_KEY_DEL, down);
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else if (*code == XK_Return) nk_input_key(ctx, NK_KEY_ENTER, down);
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else if (*code == XK_Tab) nk_input_key(ctx, NK_KEY_TAB, down);
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else if (*code == XK_Left) nk_input_key(ctx, NK_KEY_LEFT, down);
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else if (*code == XK_Right) nk_input_key(ctx, NK_KEY_RIGHT, down);
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else if (*code == XK_Up) nk_input_key(ctx, NK_KEY_UP, down);
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else if (*code == XK_Down) nk_input_key(ctx, NK_KEY_DOWN, down);
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else if (*code == XK_BackSpace) nk_input_key(ctx, NK_KEY_BACKSPACE, down);
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else if (*code == XK_space && !down) nk_input_char(ctx, ' ');
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else if (*code == XK_Page_Up) nk_input_key(ctx, NK_KEY_SCROLL_UP, down);
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else if (*code == XK_Page_Down) nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
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else if (*code == XK_Home) {
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nk_input_key(ctx, NK_KEY_TEXT_START, down);
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nk_input_key(ctx, NK_KEY_SCROLL_START, down);
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} else if (*code == XK_End) {
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nk_input_key(ctx, NK_KEY_TEXT_END, down);
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nk_input_key(ctx, NK_KEY_SCROLL_END, down);
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} else {
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if (*code == 'c' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_COPY, down);
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else if (*code == 'v' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_PASTE, down);
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else if (*code == 'x' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_CUT, down);
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else if (*code == 'z' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_UNDO, down);
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else if (*code == 'r' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_REDO, down);
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else if (*code == XK_Left && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
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else if (*code == XK_Right && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
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else if (*code == 'b' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down);
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else if (*code == 'e' && (evt->xkey.state & ControlMask))
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nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down);
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else {
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if (*code == 'i')
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nk_input_key(ctx, NK_KEY_TEXT_INSERT_MODE, down);
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else if (*code == 'r')
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nk_input_key(ctx, NK_KEY_TEXT_REPLACE_MODE, down);
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if (down) {
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char buf[32];
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KeySym keysym = 0;
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if (XLookupString((XKeyEvent*)evt, buf, 32, &keysym, NULL) != NoSymbol)
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nk_input_glyph(ctx, buf);
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}
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}
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}
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XFree(code);
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return 1;
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} else if (evt->type == ButtonPress || evt->type == ButtonRelease) {
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/* Button handler */
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int down = (evt->type == ButtonPress);
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const int x = evt->xbutton.x, y = evt->xbutton.y;
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if (evt->xbutton.button == Button1) {
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if (down) { /* Double-Click Button handler */
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long dt = nk_timestamp() - x11.last_button_click;
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if (dt > NK_X11_DOUBLE_CLICK_LO && dt < NK_X11_DOUBLE_CLICK_HI)
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nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_true);
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x11.last_button_click = nk_timestamp();
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} else nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, nk_false);
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nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
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} else if (evt->xbutton.button == Button2)
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nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
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else if (evt->xbutton.button == Button3)
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nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
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else if (evt->xbutton.button == Button4)
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nk_input_scroll(ctx, nk_vec2(0,1.0f));
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else if (evt->xbutton.button == Button5)
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nk_input_scroll(ctx, nk_vec2(0,-1.0f));
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else return 0;
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return 1;
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} else if (evt->type == MotionNotify) {
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/* Mouse motion handler */
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const int x = evt->xmotion.x, y = evt->xmotion.y;
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nk_input_motion(ctx, x, y);
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if (ctx->input.mouse.grabbed) {
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ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
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ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
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XWarpPointer(x11.dpy, None, x11.win, 0, 0, 0, 0, (int)ctx->input.mouse.pos.x, (int)ctx->input.mouse.pos.y);
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}
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return 1;
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} else if (evt->type == KeymapNotify) {
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XRefreshKeyboardMapping(&evt->xmapping);
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return 1;
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}
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return 0;
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}
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NK_API struct nk_context*
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nk_x11_init(Display *dpy, Window win)
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{
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x11.dpy = dpy;
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x11.win = win;
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if (!setlocale(LC_ALL,"")) return 0;
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if (!XSupportsLocale()) return 0;
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if (!XSetLocaleModifiers("@im=none")) return 0;
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/* create invisible cursor */
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{static XColor dummy; char data[1] = {0};
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Pixmap blank = XCreateBitmapFromData(dpy, win, data, 1, 1);
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if (blank == None) return 0;
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x11.cursor = XCreatePixmapCursor(dpy, blank, blank, &dummy, &dummy, 0, 0);
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XFreePixmap(dpy, blank);}
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nk_buffer_init_default(&x11.ogl.cmds);
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nk_init_default(&x11.ctx, 0);
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return &x11.ctx;
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}
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NK_API void
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nk_x11_shutdown(void)
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{
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struct nk_x11_device *dev = &x11.ogl;
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nk_font_atlas_clear(&x11.atlas);
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nk_free(&x11.ctx);
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glDeleteTextures(1, &dev->font_tex);
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nk_buffer_free(&dev->cmds);
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XFreeCursor(x11.dpy, x11.cursor);
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memset(&x11, 0, sizeof(x11));
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}
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#endif
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