359 lines
13 KiB
C
359 lines
13 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 2015-2017 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_SDL_GL2_H_
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#define NK_SDL_GL2_H_
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#include <SDL2/SDL.h>
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NK_API struct nk_context* nk_sdl_init(SDL_Window *win);
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NK_API void nk_sdl_font_stash_begin(struct nk_font_atlas **atlas);
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NK_API void nk_sdl_font_stash_end(void);
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NK_API int nk_sdl_handle_event(SDL_Event *evt);
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NK_API void nk_sdl_render(enum nk_anti_aliasing);
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NK_API void nk_sdl_shutdown(void);
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NK_API void nk_sdl_handle_grab(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_SDL_GL2_IMPLEMENTATION
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#include <string.h>
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#include <stdlib.h>
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struct nk_sdl_device {
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struct nk_buffer cmds;
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struct nk_draw_null_texture tex_null;
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GLuint font_tex;
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};
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struct nk_sdl_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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static struct nk_sdl {
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SDL_Window *win;
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struct nk_sdl_device ogl;
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struct nk_context ctx;
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struct nk_font_atlas atlas;
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float time_of_last_frame;
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} sdl;
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NK_INTERN void
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nk_sdl_device_upload_atlas(const void *image, int width, int height)
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{
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struct nk_sdl_device *dev = &sdl.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_sdl_render(enum nk_anti_aliasing AA)
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{
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/* setup global state */
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struct nk_sdl_device *dev = &sdl.ogl;
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int width, height;
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int display_width, display_height;
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struct nk_vec2 scale;
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float now = ((float)SDL_GetTicks64()) / 1000;
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sdl.ctx.delta_time_seconds = now - sdl.time_of_last_frame;
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sdl.time_of_last_frame = now;
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SDL_GetWindowSize(sdl.win, &width, &height);
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SDL_GL_GetDrawableSize(sdl.win, &display_width, &display_height);
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scale.x = (float)display_width/(float)width;
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scale.y = (float)display_height/(float)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)display_width,(GLsizei)display_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_sdl_vertex);
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size_t vp = offsetof(struct nk_sdl_vertex, position);
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size_t vt = offsetof(struct nk_sdl_vertex, uv);
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size_t vc = offsetof(struct nk_sdl_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 converting 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_sdl_vertex, position)},
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{NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sdl_vertex, uv)},
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{NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_sdl_vertex, col)},
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{NK_VERTEX_LAYOUT_END}
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};
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memset(&config, 0, sizeof(config));
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config.vertex_layout = vertex_layout;
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config.vertex_size = sizeof(struct nk_sdl_vertex);
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config.vertex_alignment = NK_ALIGNOF(struct nk_sdl_vertex);
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config.tex_null = dev->tex_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(&sdl.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, &sdl.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 * scale.x),
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(GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * scale.y),
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(GLint)(cmd->clip_rect.w * scale.x),
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(GLint)(cmd->clip_rect.h * scale.y));
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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(&sdl.ctx);
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nk_buffer_clear(&dev->cmds);
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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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static void
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nk_sdl_clipboard_paste(nk_handle usr, struct nk_text_edit *edit)
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{
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const char *text = SDL_GetClipboardText();
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if (text) nk_textedit_paste(edit, text, nk_strlen(text));
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(void)usr;
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}
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static void
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nk_sdl_clipboard_copy(nk_handle usr, const char *text, int len)
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{
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char *str = 0;
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(void)usr;
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if (!len) return;
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str = (char*)malloc((size_t)len+1);
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if (!str) return;
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memcpy(str, text, (size_t)len);
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str[len] = '\0';
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SDL_SetClipboardText(str);
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free(str);
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}
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NK_API struct nk_context*
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nk_sdl_init(SDL_Window *win)
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{
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sdl.win = win;
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nk_init_default(&sdl.ctx, 0);
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sdl.ctx.clip.copy = nk_sdl_clipboard_copy;
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sdl.ctx.clip.paste = nk_sdl_clipboard_paste;
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sdl.ctx.clip.userdata = nk_handle_ptr(0);
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nk_buffer_init_default(&sdl.ogl.cmds);
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return &sdl.ctx;
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}
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NK_API void
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nk_sdl_font_stash_begin(struct nk_font_atlas **atlas)
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{
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nk_font_atlas_init_default(&sdl.atlas);
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nk_font_atlas_begin(&sdl.atlas);
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*atlas = &sdl.atlas;
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}
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NK_API void
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nk_sdl_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(&sdl.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
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nk_sdl_device_upload_atlas(image, w, h);
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nk_font_atlas_end(&sdl.atlas, nk_handle_id((int)sdl.ogl.font_tex), &sdl.ogl.tex_null);
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if (sdl.atlas.default_font)
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nk_style_set_font(&sdl.ctx, &sdl.atlas.default_font->handle);
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}
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NK_API void
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nk_sdl_handle_grab(void)
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{
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struct nk_context *ctx = &sdl.ctx;
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if (ctx->input.mouse.grab) {
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SDL_SetRelativeMouseMode(SDL_TRUE);
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} else if (ctx->input.mouse.ungrab) {
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/* better support for older SDL by setting mode first; causes an extra mouse motion event */
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SDL_SetRelativeMouseMode(SDL_FALSE);
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SDL_WarpMouseInWindow(sdl.win, (int)ctx->input.mouse.prev.x, (int)ctx->input.mouse.prev.y);
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} else 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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}
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}
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NK_API int
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nk_sdl_handle_event(SDL_Event *evt)
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{
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struct nk_context *ctx = &sdl.ctx;
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switch(evt->type)
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{
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case SDL_KEYUP: /* KEYUP & KEYDOWN share same routine */
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case SDL_KEYDOWN:
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{
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int down = evt->type == SDL_KEYDOWN;
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const Uint8* state = SDL_GetKeyboardState(0);
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switch(evt->key.keysym.sym)
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{
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case SDLK_RSHIFT: /* RSHIFT & LSHIFT share same routine */
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case SDLK_LSHIFT: nk_input_key(ctx, NK_KEY_SHIFT, down); break;
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case SDLK_DELETE: nk_input_key(ctx, NK_KEY_DEL, down); break;
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case SDLK_RETURN: nk_input_key(ctx, NK_KEY_ENTER, down); break;
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case SDLK_TAB: nk_input_key(ctx, NK_KEY_TAB, down); break;
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case SDLK_BACKSPACE: nk_input_key(ctx, NK_KEY_BACKSPACE, down); break;
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case SDLK_HOME: nk_input_key(ctx, NK_KEY_TEXT_START, down);
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nk_input_key(ctx, NK_KEY_SCROLL_START, down); break;
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case SDLK_END: nk_input_key(ctx, NK_KEY_TEXT_END, down);
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nk_input_key(ctx, NK_KEY_SCROLL_END, down); break;
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case SDLK_PAGEDOWN: nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down); break;
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case SDLK_PAGEUP: nk_input_key(ctx, NK_KEY_SCROLL_UP, down); break;
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case SDLK_z: nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_r: nk_input_key(ctx, NK_KEY_TEXT_REDO, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_c: nk_input_key(ctx, NK_KEY_COPY, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_v: nk_input_key(ctx, NK_KEY_PASTE, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_x: nk_input_key(ctx, NK_KEY_CUT, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_b: nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_e: nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && state[SDL_SCANCODE_LCTRL]); break;
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case SDLK_UP: nk_input_key(ctx, NK_KEY_UP, down); break;
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case SDLK_DOWN: nk_input_key(ctx, NK_KEY_DOWN, down); break;
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case SDLK_LEFT:
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if (state[SDL_SCANCODE_LCTRL])
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nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
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else nk_input_key(ctx, NK_KEY_LEFT, down);
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break;
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case SDLK_RIGHT:
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if (state[SDL_SCANCODE_LCTRL])
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nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
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else nk_input_key(ctx, NK_KEY_RIGHT, down);
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break;
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}
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}
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return 1;
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case SDL_MOUSEBUTTONUP: /* MOUSEBUTTONUP & MOUSEBUTTONDOWN share same routine */
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case SDL_MOUSEBUTTONDOWN:
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{
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int down = evt->type == SDL_MOUSEBUTTONDOWN;
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const int x = evt->button.x, y = evt->button.y;
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switch(evt->button.button)
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{
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case SDL_BUTTON_LEFT:
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if (evt->button.clicks > 1)
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nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, down);
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nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down); break;
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case SDL_BUTTON_MIDDLE: nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down); break;
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case SDL_BUTTON_RIGHT: nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down); break;
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}
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}
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return 1;
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case SDL_MOUSEMOTION:
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if (ctx->input.mouse.grabbed) {
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int x = (int)ctx->input.mouse.prev.x, y = (int)ctx->input.mouse.prev.y;
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nk_input_motion(ctx, x + evt->motion.xrel, y + evt->motion.yrel);
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}
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else nk_input_motion(ctx, evt->motion.x, evt->motion.y);
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return 1;
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case SDL_TEXTINPUT:
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{
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nk_glyph glyph;
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memcpy(glyph, evt->text.text, NK_UTF_SIZE);
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nk_input_glyph(ctx, glyph);
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}
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return 1;
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case SDL_MOUSEWHEEL:
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nk_input_scroll(ctx,nk_vec2((float)evt->wheel.x,(float)evt->wheel.y));
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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
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void nk_sdl_shutdown(void)
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{
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struct nk_sdl_device *dev = &sdl.ogl;
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nk_font_atlas_clear(&sdl.atlas);
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nk_free(&sdl.ctx);
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glDeleteTextures(1, &dev->font_tex);
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nk_buffer_free(&dev->cmds);
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memset(&sdl, 0, sizeof(sdl));
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}
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#endif
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