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Diffstat (limited to 'nuklear/demo/sdl_opengl2/nuklear_sdl_gl2.h')
-rw-r--r--nuklear/demo/sdl_opengl2/nuklear_sdl_gl2.h342
1 files changed, 342 insertions, 0 deletions
diff --git a/nuklear/demo/sdl_opengl2/nuklear_sdl_gl2.h b/nuklear/demo/sdl_opengl2/nuklear_sdl_gl2.h
new file mode 100644
index 0000000..45c5970
--- /dev/null
+++ b/nuklear/demo/sdl_opengl2/nuklear_sdl_gl2.h
@@ -0,0 +1,342 @@
+/*
+ * Nuklear - v1.17 - public domain
+ * no warrenty implied; use at your own risk.
+ * authored from 2015-2016 by Micha Mettke
+ */
+/*
+ * ==============================================================
+ *
+ * API
+ *
+ * ===============================================================
+ */
+#ifndef NK_SDL_GL2_H_
+#define NK_SDL_GL2_H_
+
+#include <SDL2/SDL.h>
+NK_API struct nk_context* nk_sdl_init(SDL_Window *win);
+NK_API void nk_sdl_font_stash_begin(struct nk_font_atlas **atlas);
+NK_API void nk_sdl_font_stash_end(void);
+NK_API int nk_sdl_handle_event(SDL_Event *evt);
+NK_API void nk_sdl_render(enum nk_anti_aliasing , int max_vertex_buffer, int max_element_buffer);
+NK_API void nk_sdl_shutdown(void);
+
+#endif
+/*
+ * ==============================================================
+ *
+ * IMPLEMENTATION
+ *
+ * ===============================================================
+ */
+#ifdef NK_SDL_GL2_IMPLEMENTATION
+
+struct nk_sdl_device {
+ struct nk_buffer cmds;
+ struct nk_draw_null_texture null;
+ GLuint font_tex;
+};
+
+struct nk_sdl_vertex {
+ float position[2];
+ float uv[2];
+ nk_byte col[4];
+};
+
+static struct nk_sdl {
+ SDL_Window *win;
+ struct nk_sdl_device ogl;
+ struct nk_context ctx;
+ struct nk_font_atlas atlas;
+} sdl;
+
+NK_INTERN void
+nk_sdl_device_upload_atlas(const void *image, int width, int height)
+{
+ struct nk_sdl_device *dev = &sdl.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_sdl_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
+{
+ /* setup global state */
+ struct nk_sdl_device *dev = &sdl.ogl;
+ int width, height;
+ int display_width, display_height;
+ struct nk_vec2 scale;
+
+ SDL_GetWindowSize(sdl.win, &width, &height);
+ SDL_GL_GetDrawableSize(sdl.win, &display_width, &display_height);
+ scale.x = (float)display_width/(float)width;
+ scale.y = (float)display_height/(float)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)display_width,(GLsizei)display_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_sdl_vertex);
+ size_t vp = offsetof(struct nk_sdl_vertex, position);
+ size_t vt = offsetof(struct nk_sdl_vertex, uv);
+ size_t vc = offsetof(struct nk_sdl_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 converting 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_sdl_vertex, position)},
+ {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sdl_vertex, uv)},
+ {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_sdl_vertex, col)},
+ {NK_VERTEX_LAYOUT_END}
+ };
+ NK_MEMSET(&config, 0, sizeof(config));
+ config.vertex_layout = vertex_layout;
+ config.vertex_size = sizeof(struct nk_sdl_vertex);
+ config.vertex_alignment = NK_ALIGNOF(struct nk_sdl_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(&sdl.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, &sdl.ctx, &dev->cmds)
+ {
+ if (!cmd->elem_count) continue;
+ glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
+ glScissor(
+ (GLint)(cmd->clip_rect.x * scale.x),
+ (GLint)((height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * scale.y),
+ (GLint)(cmd->clip_rect.w * scale.x),
+ (GLint)(cmd->clip_rect.h * scale.y));
+ glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
+ offset += cmd->elem_count;
+ }
+ nk_clear(&sdl.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();
+}
+
+static void
+nk_sdl_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
+{
+ const char *text = SDL_GetClipboardText();
+ if (text) nk_textedit_paste(edit, text, nk_strlen(text));
+ (void)usr;
+}
+
+static void
+nk_sdl_clipbard_copy(nk_handle usr, const char *text, int len)
+{
+ char *str = 0;
+ (void)usr;
+ if (!len) return;
+ str = (char*)malloc((size_t)len+1);
+ if (!str) return;
+ memcpy(str, text, (size_t)len);
+ str[len] = '\0';
+ SDL_SetClipboardText(str);
+ free(str);
+}
+
+NK_API struct nk_context*
+nk_sdl_init(SDL_Window *win)
+{
+ sdl.win = win;
+ nk_init_default(&sdl.ctx, 0);
+ sdl.ctx.clip.copy = nk_sdl_clipbard_copy;
+ sdl.ctx.clip.paste = nk_sdl_clipbard_paste;
+ sdl.ctx.clip.userdata = nk_handle_ptr(0);
+ nk_buffer_init_default(&sdl.ogl.cmds);
+ return &sdl.ctx;
+}
+
+NK_API void
+nk_sdl_font_stash_begin(struct nk_font_atlas **atlas)
+{
+ nk_font_atlas_init_default(&sdl.atlas);
+ nk_font_atlas_begin(&sdl.atlas);
+ *atlas = &sdl.atlas;
+}
+
+NK_API void
+nk_sdl_font_stash_end(void)
+{
+ const void *image; int w, h;
+ image = nk_font_atlas_bake(&sdl.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
+ nk_sdl_device_upload_atlas(image, w, h);
+ nk_font_atlas_end(&sdl.atlas, nk_handle_id((int)sdl.ogl.font_tex), &sdl.ogl.null);
+ if (sdl.atlas.default_font)
+ nk_style_set_font(&sdl.ctx, &sdl.atlas.default_font->handle);
+}
+
+NK_API int
+nk_sdl_handle_event(SDL_Event *evt)
+{
+ struct nk_context *ctx = &sdl.ctx;
+
+ /* optional grabbing behavior */
+ if (ctx->input.mouse.grab) {
+ SDL_SetRelativeMouseMode(SDL_TRUE);
+ ctx->input.mouse.grab = 0;
+ } else if (ctx->input.mouse.ungrab) {
+ int x = (int)ctx->input.mouse.prev.x, y = (int)ctx->input.mouse.prev.y;
+ SDL_SetRelativeMouseMode(SDL_FALSE);
+ SDL_WarpMouseInWindow(sdl.win, x, y);
+ ctx->input.mouse.ungrab = 0;
+ }
+ if (evt->type == SDL_KEYUP || evt->type == SDL_KEYDOWN) {
+ /* key events */
+ int down = evt->type == SDL_KEYDOWN;
+ const Uint8* state = SDL_GetKeyboardState(0);
+ SDL_Keycode sym = evt->key.keysym.sym;
+ if (sym == SDLK_RSHIFT || sym == SDLK_LSHIFT)
+ nk_input_key(ctx, NK_KEY_SHIFT, down);
+ else if (sym == SDLK_DELETE)
+ nk_input_key(ctx, NK_KEY_DEL, down);
+ else if (sym == SDLK_RETURN)
+ nk_input_key(ctx, NK_KEY_ENTER, down);
+ else if (sym == SDLK_TAB)
+ nk_input_key(ctx, NK_KEY_TAB, down);
+ else if (sym == SDLK_BACKSPACE)
+ nk_input_key(ctx, NK_KEY_BACKSPACE, down);
+ else if (sym == SDLK_HOME) {
+ nk_input_key(ctx, NK_KEY_TEXT_START, down);
+ nk_input_key(ctx, NK_KEY_SCROLL_START, down);
+ } else if (sym == SDLK_END) {
+ nk_input_key(ctx, NK_KEY_TEXT_END, down);
+ nk_input_key(ctx, NK_KEY_SCROLL_END, down);
+ } else if (sym == SDLK_PAGEDOWN) {
+ nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
+ } else if (sym == SDLK_PAGEUP) {
+ nk_input_key(ctx, NK_KEY_SCROLL_UP, down);
+ } else if (sym == SDLK_z)
+ nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_r)
+ nk_input_key(ctx, NK_KEY_TEXT_REDO, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_c)
+ nk_input_key(ctx, NK_KEY_COPY, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_v)
+ nk_input_key(ctx, NK_KEY_PASTE, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_x)
+ nk_input_key(ctx, NK_KEY_CUT, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_b)
+ nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_e)
+ nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && state[SDL_SCANCODE_LCTRL]);
+ else if (sym == SDLK_UP)
+ nk_input_key(ctx, NK_KEY_UP, down);
+ else if (sym == SDLK_DOWN)
+ nk_input_key(ctx, NK_KEY_DOWN, down);
+ else if (sym == SDLK_LEFT) {
+ if (state[SDL_SCANCODE_LCTRL])
+ nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
+ else nk_input_key(ctx, NK_KEY_LEFT, down);
+ } else if (sym == SDLK_RIGHT) {
+ if (state[SDL_SCANCODE_LCTRL])
+ nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
+ else nk_input_key(ctx, NK_KEY_RIGHT, down);
+ } else return 0;
+ return 1;
+ } else if (evt->type == SDL_MOUSEBUTTONDOWN || evt->type == SDL_MOUSEBUTTONUP) {
+ /* mouse button */
+ int down = evt->type == SDL_MOUSEBUTTONDOWN;
+ const int x = evt->button.x, y = evt->button.y;
+ if (evt->button.button == SDL_BUTTON_LEFT)
+ nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
+ if (evt->button.button == SDL_BUTTON_MIDDLE)
+ nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
+ if (evt->button.button == SDL_BUTTON_RIGHT)
+ nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
+ else return 0;
+ return 1;
+ } else if (evt->type == SDL_MOUSEMOTION) {
+ if (ctx->input.mouse.grabbed) {
+ int x = (int)ctx->input.mouse.prev.x, y = (int)ctx->input.mouse.prev.y;
+ nk_input_motion(ctx, x + evt->motion.xrel, y + evt->motion.yrel);
+ } else nk_input_motion(ctx, evt->motion.x, evt->motion.y);
+ return 1;
+ } else if (evt->type == SDL_TEXTINPUT) {
+ nk_glyph glyph;
+ memcpy(glyph, evt->text.text, NK_UTF_SIZE);
+ nk_input_glyph(ctx, glyph);
+ return 1;
+ } else if (evt->type == SDL_MOUSEWHEEL) {
+ nk_input_scroll(ctx,(float)evt->wheel.y);
+ return 1;
+ }
+ return 0;
+}
+
+NK_API
+void nk_sdl_shutdown(void)
+{
+ struct nk_sdl_device *dev = &sdl.ogl;
+ nk_font_atlas_clear(&sdl.atlas);
+ nk_free(&sdl.ctx);
+ glDeleteTextures(1, &dev->font_tex);
+ nk_buffer_free(&dev->cmds);
+ memset(&sdl, 0, sizeof(sdl));
+}
+
+#endif