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- /*
- * Nuklear - 1.32.0 - public domain
- * no warrenty implied; use at your own risk.
- * authored from 2015-2016 by Micha Mettke
- */
- /*
- * ==============================================================
- *
- * API
- *
- * ===============================================================
- */
- #ifndef NK_SFML_GL3_H_
- #define NK_SFML_GL3_H_
- /* Feel free to edit here and include your own extension wrangler */
- #include <glad/glad.h>
- /* I use GLAD but you can use GLEW or what you like */
- #include <SFML/Window.hpp>
- NK_API struct nk_context* nk_sfml_init(sf::Window* window);
- NK_API void nk_sfml_font_stash_begin(struct nk_font_atlas** atlas);
- NK_API void nk_sfml_font_stash_end(void);
- NK_API int nk_sfml_handle_event(sf::Event* event);
- NK_API void nk_sfml_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
- NK_API void nk_sfml_shutdown(void);
- NK_API void nk_sfml_device_create(void);
- NK_API void nk_sfml_device_destroy(void);
- #endif
- /*
- * ==============================================================
- *
- * IMPLEMENTATION
- *
- * ===============================================================
- */
- #ifdef NK_SFML_GL3_IMPLEMENTATION
- #include <cstring>
- #include <assert.h>
- #include <string>
- struct nk_sfml_device {
- struct nk_buffer cmds;
- struct nk_draw_null_texture tex_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;
- };
- struct nk_sfml_vertex {
- float position[2];
- float uv[2];
- nk_byte col[4];
- };
- static struct nk_sfml {
- sf::Window* window;
- struct nk_sfml_device ogl;
- struct nk_context ctx;
- struct nk_font_atlas atlas;
- sf::Clock* frame_delta_clock;
- } sfml;
- #ifdef __APPLE__
- #define NK_SHADER_VERSION "#version 150\n"
- #else
- #define NK_SHADER_VERSION "#version 300 es\n"
- #endif
- NK_API void
- nk_sfml_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_sfml_device* dev = &sfml.ogl;
- 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_sfml_vertex);
- size_t vp = NK_OFFSETOF(struct nk_sfml_vertex, position);
- size_t vt = NK_OFFSETOF(struct nk_sfml_vertex, uv);
- size_t vc = NK_OFFSETOF(struct nk_sfml_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);
- }
- NK_API void
- nk_sfml_device_destroy(void)
- {
- struct nk_sfml_device* dev = &sfml.ogl;
- glDetachShader(dev->prog, dev->vert_shdr);
- glDetachShader(dev->prog, dev->frag_shdr);
- glDeleteShader(dev->vert_shdr);
- glDeleteShader(dev->vert_shdr);
- glDeleteProgram(dev->prog);
- glDeleteTextures(1, &dev->font_tex);
- glDeleteBuffers(1, &dev->vbo);
- glDeleteBuffers(1, &dev->ebo);
- nk_buffer_free(&dev->cmds);
- }
- NK_INTERN void
- nk_sfml_device_upload_atlas(const void* image, int width, int height)
- {
- struct nk_sfml_device* dev = &sfml.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_sfml_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
- {
- /* setup global state */
- struct nk_sfml_device* dev = &sfml.ogl;
- int window_width = sfml.window->getSize().x;
- int window_height = sfml.window->getSize().y;
- 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 },
- };
- sfml.ctx.delta_time_seconds = (float)((double)sfml.frame_delta_clock->getElapsedTime().asMicroseconds() / 1000000);
- sfml.frame_delta_clock->restart();
- ortho[0][0] /= (GLfloat)window_width;
- ortho[1][1] /= (GLfloat)window_height;
- glViewport(0, 0, window_width, window_height);
- 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]);
- {
- /* 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 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 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_sfml_vertex, position)},
- {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sfml_vertex, uv)},
- {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_sfml_vertex, col)},
- {NK_VERTEX_LAYOUT_END}
- };
- memset(&config, 0, sizeof(config));
- config.vertex_layout = vertex_layout;
- config.vertex_size = sizeof(struct nk_sfml_vertex);
- config.vertex_alignment = NK_ALIGNOF(struct nk_sfml_vertex);
- config.tex_null = dev->tex_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;
- /* setup buffers to load vertices and elements */
- struct nk_buffer vbuf, ebuf;
- nk_buffer_init_fixed(&vbuf, vertices, (nk_size)max_vertex_buffer);
- nk_buffer_init_fixed(&ebuf, elements, (nk_size)max_element_buffer);
- nk_convert(&sfml.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, &sfml.ctx, &dev->cmds)
- {
- if (!cmd->elem_count) continue;
- glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
- glScissor(
- (GLint)(cmd->clip_rect.x),
- (GLint)((window_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(&sfml.ctx);
- nk_buffer_clear(&dev->cmds);
- }
- glUseProgram(0);
- glBindBuffer(GL_ARRAY_BUFFER, 0);
- glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
- glBindVertexArray(0);
- glDisable(GL_BLEND);
- glDisable(GL_SCISSOR_TEST);
- }
- static void
- nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
- {
- #if 0
- /* Not Implemented in SFML */
- (void)usr;
- sf::Clipboard clipboard(sfml.window);
- const char* text = clipboard.getText();
- if(text) nk_textedit_paste(edit, text, nk_strlen(text));
- #else
- NK_UNUSED(usr);
- NK_UNUSED(edit);
- #endif
- }
- static void
- nk_sfml_clipboard_copy(nk_handle usr, const char* text, int len)
- {
- #if 0
- 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';
- /* Not Implemented in SFML */
- sf::Clipboard clipboard(sfml.window);
- clipboard.setText(str);
- free(str);
- #else
- NK_UNUSED(usr);
- NK_UNUSED(text);
- NK_UNUSED(len);
- #endif
- }
- NK_API struct nk_context*
- nk_sfml_init(sf::Window* window)
- {
- sfml.window = window;
- nk_init_default(&sfml.ctx, 0);
- sfml.ctx.clip.copy = nk_sfml_clipboard_copy;
- sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
- sfml.ctx.clip.userdata = nk_handle_ptr(0);
- nk_sfml_device_create();
- sfml.frame_delta_clock = new sf::Clock();
- return &sfml.ctx;
- }
- NK_API void
- nk_sfml_font_stash_begin(struct nk_font_atlas** atlas)
- {
- nk_font_atlas_init_default(&sfml.atlas);
- nk_font_atlas_begin(&sfml.atlas);
- *atlas = &sfml.atlas;
- }
- NK_API void
- nk_sfml_font_stash_end()
- {
- const void* image;
- int w, h;
- image = nk_font_atlas_bake(&sfml.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
- nk_sfml_device_upload_atlas(image, w, h);
- nk_font_atlas_end(&sfml.atlas, nk_handle_id((int)sfml.ogl.font_tex), &sfml.ogl.tex_null);
- if(sfml.atlas.default_font)
- nk_style_set_font(&sfml.ctx, &sfml.atlas.default_font->handle);
- }
- NK_API int
- nk_sfml_handle_event(sf::Event* evt)
- {
- struct nk_context* ctx = &sfml.ctx;
- /* optional grabbing behavior */
- if(ctx->input.mouse.grab)
- ctx->input.mouse.grab = 0;
- else if(ctx->input.mouse.ungrab) {
- int x = (int)ctx->input.mouse.prev.x;
- int y = (int)ctx->input.mouse.prev.y;
- sf::Mouse::setPosition(sf::Vector2i(x, y), *sfml.window);
- ctx->input.mouse.ungrab = 0;
- }
- if(evt->type == sf::Event::KeyReleased || evt->type == sf::Event::KeyPressed)
- {
- int down = evt->type == sf::Event::KeyPressed;
- sf::Keyboard::Key key = evt->key.code;
- if(key == sf::Keyboard::RShift || key == sf::Keyboard::LShift)
- nk_input_key(ctx, NK_KEY_SHIFT, down);
- else if(key == sf::Keyboard::Delete)
- nk_input_key(ctx, NK_KEY_DEL, down);
- else if(key == sf::Keyboard::Enter)
- nk_input_key(ctx, NK_KEY_ENTER, down);
- else if(key == sf::Keyboard::Tab)
- nk_input_key(ctx, NK_KEY_TAB, down);
- else if(key == sf::Keyboard::BackSpace)
- nk_input_key(ctx, NK_KEY_BACKSPACE, down);
- else if(key == sf::Keyboard::Home) {
- nk_input_key(ctx, NK_KEY_TEXT_START, down);
- nk_input_key(ctx, NK_KEY_SCROLL_START, down);
- } else if(key == sf::Keyboard::End) {
- nk_input_key(ctx, NK_KEY_TEXT_END, down);
- nk_input_key(ctx, NK_KEY_SCROLL_END, down);
- } else if(key == sf::Keyboard::PageDown)
- nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
- else if(key == sf::Keyboard::PageUp)
- nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
- else if(key == sf::Keyboard::Z)
- nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::R)
- nk_input_key(ctx, NK_KEY_TEXT_REDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::C)
- nk_input_key(ctx, NK_KEY_COPY, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::V)
- nk_input_key(ctx, NK_KEY_PASTE, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::X)
- nk_input_key(ctx, NK_KEY_CUT, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::B)
- nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::E)
- nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
- else if(key == sf::Keyboard::Up)
- nk_input_key(ctx, NK_KEY_UP, down);
- else if(key == sf::Keyboard::Down)
- nk_input_key(ctx, NK_KEY_DOWN, down);
- else if(key == sf::Keyboard::Left) {
- if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
- nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
- else nk_input_key(ctx, NK_KEY_LEFT, down);
- } else if(key == sf::Keyboard::Right) {
- if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
- 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 == sf::Event::MouseButtonPressed || evt->type == sf::Event::MouseButtonReleased) {
- int down = evt->type == sf::Event::MouseButtonPressed;
- const int x = evt->mouseButton.x, y = evt->mouseButton.y;
- if(evt->mouseButton.button == sf::Mouse::Left)
- nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
- if(evt->mouseButton.button == sf::Mouse::Middle)
- nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
- if(evt->mouseButton.button == sf::Mouse::Right)
- nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
- else return 0;
- return 1;
- } else if(evt->type == sf::Event::MouseMoved) {
- nk_input_motion(ctx, evt->mouseMove.x, evt->mouseMove.y);
- return 1;
- } else if(evt->type == sf::Event::TouchBegan || evt->type == sf::Event::TouchEnded) {
- int down = evt->type == sf::Event::TouchBegan;
- const int x = evt->touch.x, y = evt->touch.y;
- nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
- return 1;
- } else if(evt->type == sf::Event::TouchMoved) {
- if(ctx->input.mouse.grabbed) {
- int x = (int)ctx->input.mouse.prev.x;
- int y = (int)ctx->input.mouse.prev.y;
- nk_input_motion(ctx, x + evt->touch.x, y + evt->touch.y);
- } else nk_input_motion(ctx, evt->touch.x, evt->touch.y);
- return 1;
- } else if(evt->type == sf::Event::TextEntered) {
- /* 8 ~ backspace */
- if (evt->text.unicode != 8) {
- nk_input_unicode(ctx, evt->text.unicode);
- }
- return 1;
- } else if(evt->type == sf::Event::MouseWheelScrolled) {
- nk_input_scroll(ctx, nk_vec2(0,evt->mouseWheelScroll.delta));
- return 1;
- }
- return 0;
- }
- NK_API
- void nk_sfml_shutdown()
- {
- nk_font_atlas_clear(&sfml.atlas);
- nk_free(&sfml.ctx);
- nk_sfml_device_destroy();
- delete sfml.frame_delta_clock;
- memset(&sfml, 0, sizeof(sfml));
- }
- #endif
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