/* nuklear - v1.05 - public domain */ #include #include #include #include #include #include #include #include #include #include #include #define NK_PRIVATE #define NK_INCLUDE_FIXED_TYPES #define NK_INCLUDE_STANDARD_IO #define NK_INCLUDE_DEFAULT_ALLOCATOR #define NK_INCLUDE_VERTEX_BUFFER_OUTPUT #define NK_INCLUDE_FONT_BAKING #define NK_INCLUDE_DEFAULT_FONT #define NK_IMPLEMENTATION #include "../nuklear.h" #define STB_IMAGE_IMPLEMENTATION #include "stb_image.h" /* macros */ #define WINDOW_WIDTH 1200 #define WINDOW_HEIGHT 800 #define MAX_VERTEX_MEMORY 512 * 1024 #define MAX_ELEMENT_MEMORY 128 * 1024 #define UNUSED(a) (void)a #define MIN(a,b) ((a) < (b) ? (a) : (b)) #define MAX(a,b) ((a) < (b) ? (b) : (a)) #define LEN(a) (sizeof(a)/sizeof(a)[0]) #define NK_SHADER_VERSION "#version 150\n" /* =============================================================== * * DEVICE * * ===============================================================*/ struct nk_glfw_vertex { float position[2]; float uv[2]; nk_byte col[4]; }; struct 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; }; /* function icon_load () is not used to build this file but might still be useful :) */ /* static void die(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fputs("\n", stderr); exit(EXIT_FAILURE); } static struct nk_image icon_load(const char *filename) { int x,y,n; GLuint tex; unsigned char *data = stbi_load(filename, &x, &y, &n, 0); if (!data) die("[SDL]: failed to load image: %s", filename); glGenTextures(1, &tex); glBindTexture(GL_TEXTURE_2D, tex); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); glGenerateMipmap(GL_TEXTURE_2D); stbi_image_free(data); return nk_image_id((int)tex); } */ static void device_init(struct device *dev) { 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"; 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_glfw_vertex); size_t vp = offsetof(struct nk_glfw_vertex, position); size_t vt = offsetof(struct nk_glfw_vertex, uv); size_t vc = offsetof(struct nk_glfw_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); } static void device_upload_atlas(struct device *dev, const void *image, int width, int height) { 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); } static void device_shutdown(struct device *dev) { glDetachShader(dev->prog, dev->vert_shdr); glDetachShader(dev->prog, dev->frag_shdr); glDeleteShader(dev->vert_shdr); glDeleteShader(dev->frag_shdr); glDeleteProgram(dev->prog); glDeleteTextures(1, &dev->font_tex); glDeleteBuffers(1, &dev->vbo); glDeleteBuffers(1, &dev->ebo); nk_buffer_free(&dev->cmds); } static void device_draw(struct device *dev, struct nk_context *ctx, int width, int height, enum nk_anti_aliasing AA) { 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}, }; ortho[0][0] /= (GLfloat)width; ortho[1][1] /= (GLfloat)height; /* setup global state */ 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_MEMORY, NULL, GL_STREAM_DRAW); glBufferData(GL_ELEMENT_ARRAY_BUFFER, MAX_ELEMENT_MEMORY, NULL, GL_STREAM_DRAW); /* load draw 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_glfw_vertex, position)}, {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)}, {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)}, {NK_VERTEX_LAYOUT_END} }; NK_MEMSET(&config, 0, sizeof(config)); config.vertex_layout = vertex_layout; config.vertex_size = sizeof(struct nk_glfw_vertex); config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_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, MAX_VERTEX_MEMORY); nk_buffer_init_fixed(&ebuf, elements, MAX_ELEMENT_MEMORY); nk_convert(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, 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(ctx); nk_buffer_clear(&dev->cmds); } /* default OpenGL state */ glUseProgram(0); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glBindVertexArray(0); glDisable(GL_BLEND); glDisable(GL_SCISSOR_TEST); } /* glfw callbacks (I don't know if there is a easier way to access text and scroll )*/ static void error_callback(int e, const char *d){printf("Error %d: %s\n", e, d);} static void text_input(GLFWwindow *win, unsigned int codepoint) {nk_input_unicode((struct nk_context*)glfwGetWindowUserPointer(win), codepoint);} static void scroll_input(GLFWwindow *win, double _, double yoff) {UNUSED(_);nk_input_scroll((struct nk_context*)glfwGetWindowUserPointer(win), nk_vec2(0, (float)yoff));} static void pump_input(struct nk_context *ctx, GLFWwindow *win) { double x, y; nk_input_begin(ctx); glfwPollEvents(); nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS); if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS || glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS) { nk_input_key(ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_P) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS); nk_input_key(ctx, NK_KEY_SHIFT, 1); } else { nk_input_key(ctx, NK_KEY_COPY, 0); nk_input_key(ctx, NK_KEY_PASTE, 0); nk_input_key(ctx, NK_KEY_CUT, 0); nk_input_key(ctx, NK_KEY_SHIFT, 0); } glfwGetCursorPos(win, &x, &y); nk_input_motion(ctx, (int)x, (int)y); nk_input_button(ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS); nk_input_button(ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS); nk_input_button(ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS); nk_input_end(ctx); } struct nk_canvas { struct nk_command_buffer *painter; struct nk_vec2 item_spacing; struct nk_vec2 panel_padding; struct nk_style_item window_background; }; static void canvas_begin(struct nk_context *ctx, struct nk_canvas *canvas, nk_flags flags, int x, int y, int width, int height, struct nk_color background_color) { /* save style properties which will be overwritten */ canvas->panel_padding = ctx->style.window.padding; canvas->item_spacing = ctx->style.window.spacing; canvas->window_background = ctx->style.window.fixed_background; /* use the complete window space and set background */ ctx->style.window.spacing = nk_vec2(0,0); ctx->style.window.padding = nk_vec2(0,0); ctx->style.window.fixed_background = nk_style_item_color(background_color); /* create/update window and set position + size */ flags = flags & ~NK_WINDOW_DYNAMIC; nk_window_set_bounds(ctx, "Window", nk_rect(x, y, width, height)); nk_begin(ctx, "Window", nk_rect(x, y, width, height), NK_WINDOW_NO_SCROLLBAR|flags); /* allocate the complete window space for drawing */ {struct nk_rect total_space; total_space = nk_window_get_content_region(ctx); nk_layout_row_dynamic(ctx, total_space.h, 1); nk_widget(&total_space, ctx); canvas->painter = nk_window_get_canvas(ctx);} } static void canvas_end(struct nk_context *ctx, struct nk_canvas *canvas) { nk_end(ctx); ctx->style.window.spacing = canvas->panel_padding; ctx->style.window.padding = canvas->item_spacing; ctx->style.window.fixed_background = canvas->window_background; } int main(int argc, char *argv[]) { /* Platform */ static GLFWwindow *win; int width = 0, height = 0; /* GUI */ struct device device; struct nk_font_atlas atlas; struct nk_context ctx; NK_UNUSED(argc); NK_UNUSED(argv); /* GLFW */ glfwSetErrorCallback(error_callback); if (!glfwInit()) { fprintf(stdout, "[GFLW] failed to init!\n"); exit(1); } glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL); glfwMakeContextCurrent(win); glfwSetWindowUserPointer(win, &ctx); glfwSetCharCallback(win, text_input); glfwSetScrollCallback(win, scroll_input); glfwGetWindowSize(win, &width, &height); /* OpenGL */ glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT); glewExperimental = 1; if (glewInit() != GLEW_OK) { fprintf(stderr, "Failed to setup GLEW\n"); exit(1); } /* GUI */ {device_init(&device); {const void *image; int w, h; struct nk_font *font; nk_font_atlas_init_default(&atlas); nk_font_atlas_begin(&atlas); font = nk_font_atlas_add_default(&atlas, 13, 0); image = nk_font_atlas_bake(&atlas, &w, &h, NK_FONT_ATLAS_RGBA32); device_upload_atlas(&device, image, w, h); nk_font_atlas_end(&atlas, nk_handle_id((int)device.font_tex), &device.tex_null); nk_init_default(&ctx, &font->handle); glEnable(GL_TEXTURE_2D); while (!glfwWindowShouldClose(win)) { /* input */ pump_input(&ctx, win); /* draw */ {struct nk_canvas canvas; canvas_begin(&ctx, &canvas, 0, 0, 0, width, height, nk_rgb(250,250,250)); { nk_fill_rect(canvas.painter, nk_rect(15,15,210,210), 5, nk_rgb(247, 230, 154)); nk_fill_rect(canvas.painter, nk_rect(20,20,200,200), 5, nk_rgb(188, 174, 118)); nk_draw_text(canvas.painter, nk_rect(30, 30, 150, 20), "Text to draw", 12, &font->handle, nk_rgb(188,174,118), nk_rgb(0,0,0)); nk_fill_rect(canvas.painter, nk_rect(250,20,100,100), 0, nk_rgb(0,0,255)); nk_fill_circle(canvas.painter, nk_rect(20,250,100,100), nk_rgb(255,0,0)); nk_fill_triangle(canvas.painter, 250, 250, 350, 250, 300, 350, nk_rgb(0,255,0)); nk_fill_arc(canvas.painter, 300, 180, 50, 0, 3.141592654f * 3.0f / 4.0f, nk_rgb(255,255,0)); {float points[12]; points[0] = 200; points[1] = 250; points[2] = 250; points[3] = 350; points[4] = 225; points[5] = 350; points[6] = 200; points[7] = 300; points[8] = 175; points[9] = 350; points[10] = 150; points[11] = 350; nk_fill_polygon(canvas.painter, points, 6, nk_rgb(0,0,0));} nk_stroke_line(canvas.painter, 15, 10, 200, 10, 2.0f, nk_rgb(189,45,75)); nk_stroke_rect(canvas.painter, nk_rect(370, 20, 100, 100), 10, 3, nk_rgb(0,0,255)); nk_stroke_curve(canvas.painter, 380, 200, 405, 270, 455, 120, 480, 200, 2, nk_rgb(0,150,220)); nk_stroke_circle(canvas.painter, nk_rect(20, 370, 100, 100), 5, nk_rgb(0,255,120)); nk_stroke_triangle(canvas.painter, 370, 250, 470, 250, 420, 350, 6, nk_rgb(255,0,143)); } canvas_end(&ctx, &canvas);} /* Draw */ /* Framebuffer size is used instead of window size because the window size is in screen coordinates instead of pixels. * See https://www.glfw.org/docs/latest/window_guide.html#window_size for more info */ glfwGetFramebufferSize(win, &width, &height); glViewport(0, 0, width, height); glClear(GL_COLOR_BUFFER_BIT); glClearColor(0.2f, 0.2f, 0.2f, 1.0f); device_draw(&device, &ctx, width, height, NK_ANTI_ALIASING_ON); glfwSwapBuffers(win); }}} nk_font_atlas_clear(&atlas); nk_free(&ctx); device_shutdown(&device); glfwTerminate(); return 0; }