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Nuklear/example/node_editor.c
vurtun b2c87ed7c0 Release Version 1.0 
This is the first release version of nuklear (previously: zahnrad).
As for those who no the old version will notice: a lot has changed.

Most obvious should be the two biggest changes. First the name change
because I got critique that the name is hard to comprehend and
remember (understandable for non-germans) and the second is the
transistion from four files (zahnrad.h, zahnrad.c, stb_truetype
and stb_rect_pack) to one single header library file nuklear.h.
I am not 100% convinced that using a single header library is the
right choice here but so far I haven't encountered any problems.

Noticable should be as well that nuklear now directly embeds three
stb libraries: stb_truetype, stb_rect_pack and stb_textedit. Like
in previous versions the first two are optional and the library
can be compiled without. stb_textedit on the other hand powers
the text edit implementation for single as well as multiline
text manipulation. The text edit implementation is still relative
new and untested so you can expect some bugs I have not found yet.

In the demo department a lot changed as well. All platform demos
now don't compile one big demo but instead contain a simple
demo and small abstraction layer over the platform. Main benefit is
better understandablity improved ease of use. The old demo
is now split up and transfered into the example folder while each part
is self contained and compileable. (All examples use glfw I don't now
if this is the best platform but it is at least the simplest.
I also removed the apple demo because I don't have an apple system
and cannot make sure the new version runs with the old version.

Finally a lot of small bugs have been fixed as well as bugs found by
clang analyzer and coverity.
2016-04-14 16:26:15 +02:00

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/* nuklear - v1.00 - public domain */
/* This is a simple node editor just to show a simple implementation and that
* it is possible to achieve it with this library. While all nodes inside this
* example use a simple color modifier as content you could change them
* to have your custom content depending on the node time.
* Biggest difference to most usual implementation is that this example does
* not has connectors on the right position of the property that it links.
* This is mainly done out of lazyness and could be implemented as well but
* requires calculating the position of all rows and add connectors.
* In addition adding and removing nodes is quite limited at the
* moment since it is based on a simple fixed array. If this is to be converted
* into something more serious it is probably best to extend it.*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include <limits.h>
#include <GL/glew.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GLFW/glfw3.h>
#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"
/* macros */
#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600
#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])
/* ===============================================================
*
* NODE EDITOR
*
* ===============================================================*/
struct node {
int ID;
char name[32];
struct nk_rect bounds;
float value;
struct nk_color color;
int input_count;
int output_count;
struct node *next;
struct node *prev;
};
struct node_link {
int input_id;
int input_slot;
int output_id;
int output_slot;
struct nk_vec2 in;
struct nk_vec2 out;
};
struct node_linking {
int active;
struct node *node;
int input_id;
int input_slot;
};
struct node_editor {
struct node node_buf[32];
struct node_link links[64];
struct node *begin;
struct node *end;
int node_count;
int link_count;
struct nk_rect bounds;
struct node *selected;
int show_grid;
struct nk_vec2 scrolling;
struct node_linking linking;
};
static void
node_editor_push(struct node_editor *editor, struct node *node)
{
if (!editor->begin) {
node->next = NULL;
node->prev = NULL;
editor->begin = node;
editor->end = node;
} else {
node->prev = editor->end;
if (editor->end)
editor->end->next = node;
node->next = NULL;
editor->end = node;
}
}
static void
node_editor_pop(struct node_editor *editor, struct node *node)
{
if (node->next)
node->next->prev = node->prev;
if (node->prev)
node->prev->next = node->next;
if (editor->end == node)
editor->end = node->prev;
if (editor->begin == node)
editor->begin = node->next;
node->next = NULL;
node->prev = NULL;
}
static struct node*
node_editor_find(struct node_editor *editor, int ID)
{
struct node *iter = editor->begin;
while (iter) {
if (iter->ID == ID)
return iter;
iter = iter->next;
}
return NULL;
}
static void
node_editor_add(struct node_editor *editor, const char *name, struct nk_rect bounds,
struct nk_color col, int in_count, int out_count)
{
static int IDs = 0;
struct node *node;
assert((nk_size)editor->node_count < LEN(editor->node_buf));
node = &editor->node_buf[editor->node_count++];
node->ID = IDs++;
node->value = 0;
node->color = nk_rgb(255, 0, 0);
node->input_count = in_count;
node->output_count = out_count;
node->color = col;
node->bounds = bounds;
strcpy(node->name, name);
node_editor_push(editor, node);
}
static void
node_editor_link(struct node_editor *editor, int in_id, int in_slot,
int out_id, int out_slot)
{
struct node_link *link;
assert((nk_size)editor->link_count < LEN(editor->links));
link = &editor->links[editor->link_count++];
link->input_id = in_id;
link->input_slot = in_slot;
link->output_id = out_id;
link->output_slot = out_slot;
}
static void
node_editor_init(struct node_editor *editor)
{
memset(editor, 0, sizeof(*editor));
editor->begin = NULL;
editor->end = NULL;
node_editor_add(editor, "Source", nk_rect(-40, 10, 180, 220), nk_rgb(255, 0, 0), 0, 1);
node_editor_add(editor, "Source", nk_rect(-40, 260, 180, 220), nk_rgb(0, 255, 0), 0, 1);
node_editor_add(editor, "Combine", nk_rect(400, 100, 180, 220), nk_rgb(0,0,255), 2, 2);
node_editor_link(editor, 0, 0, 2, 0);
node_editor_link(editor, 1, 0, 2, 1);
editor->show_grid = nk_true;
}
static int
node_editor_run(struct node_editor *nodedit, struct nk_context *ctx)
{
int n = 0;
struct nk_rect total_space;
const struct nk_input *in = &ctx->input;
struct nk_command_buffer *canvas;
struct node *updated = 0;
struct nk_panel layout;
if (nk_begin(ctx, &layout, "Node Editor", nk_rect(50, 50, WINDOW_WIDTH, WINDOW_HEIGHT),
NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_MOVABLE))
{
/* allocate complete window space */
canvas = nk_window_get_canvas(ctx);
total_space = nk_window_get_content_region(ctx);
nk_layout_space_begin(ctx, NK_STATIC, total_space.h, nodedit->node_count);
{
struct nk_panel node, menu;
struct node *it = nodedit->begin;
struct nk_rect size = nk_layout_space_bounds(ctx);
if (nodedit->show_grid) {
/* display grid */
float x, y;
const float grid_size = 32.0f;
const struct nk_color grid_color = nk_rgb(50, 50, 50);
for (x = (float)fmod(size.x - nodedit->scrolling.x, grid_size); x < size.w; x += grid_size)
nk_stroke_line(canvas, x+size.x, size.y, x+size.x, size.y+size.h, 1.0f, grid_color);
for (y = (float)fmod(size.y - nodedit->scrolling.y, grid_size); y < size.h; y += grid_size)
nk_stroke_line(canvas, size.x, y+size.y, size.x+size.w, y+size.y, 1.0f, grid_color);
}
/* execute each node as a moveable group */
while (it) {
/* calculate scrolled node window position and size */
nk_layout_space_push(ctx, nk_rect(it->bounds.x - nodedit->scrolling.x,
it->bounds.y - nodedit->scrolling.y, it->bounds.w, it->bounds.h));
/* execute node window */
if (nk_group_begin(ctx, &node, it->name, NK_WINDOW_MOVABLE|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER|NK_WINDOW_TITLE))
{
/* always have last selected node on top */
if (nk_input_mouse_clicked(in, NK_BUTTON_LEFT, node.bounds) &&
(!(it->prev && nk_input_mouse_clicked(in, NK_BUTTON_LEFT,
nk_layout_space_rect_to_screen(ctx, node.bounds)))) &&
nodedit->end != it)
{
updated = it;
}
/* ================= NODE CONTENT =====================*/
nk_layout_row_dynamic(ctx, 25, 1);
nk_button_color(ctx, it->color, NK_BUTTON_DEFAULT);
it->color.r = (nk_byte)nk_propertyi(ctx, "#R:", 0, it->color.r, 255, 1,1);
it->color.g = (nk_byte)nk_propertyi(ctx, "#G:", 0, it->color.g, 255, 1,1);
it->color.b = (nk_byte)nk_propertyi(ctx, "#B:", 0, it->color.b, 255, 1,1);
it->color.a = (nk_byte)nk_propertyi(ctx, "#A:", 0, it->color.a, 255, 1,1);
/* ====================================================*/
nk_group_end(ctx);
}
{
/* node connector and linking */
float space;
struct nk_rect bounds;
bounds = nk_layout_space_rect_to_local(ctx, node.bounds);
bounds.x += nodedit->scrolling.x - ctx->style.window.border;
bounds.y += nodedit->scrolling.y - ctx->style.window.border;
bounds.w += 2*ctx->style.window.border;
bounds.h += 2*ctx->style.window.border;
it->bounds = bounds;
/* output connector */
space = node.bounds.h / (float)((it->output_count) + 1);
for (n = 0; n < it->output_count; ++n) {
struct nk_rect circle;
circle.x = node.bounds.x + node.bounds.w-4;
circle.y = node.bounds.y + space * (float)(n+1);
circle.w = 8; circle.h = 8;
nk_fill_circle(canvas, circle, nk_rgb(100, 100, 100));
/* start linking process */
if (nk_input_has_mouse_click_down_in_rect(in, NK_BUTTON_LEFT, circle, nk_true)) {
nodedit->linking.active = nk_true;
nodedit->linking.node = it;
nodedit->linking.input_id = it->ID;
nodedit->linking.input_slot = n;
}
/* draw curve from linked node slot to mouse position */
if (nodedit->linking.active && nodedit->linking.node == it &&
nodedit->linking.input_slot == n) {
struct nk_vec2 l0 = nk_vec2(circle.x + 3, circle.y + 3);
struct nk_vec2 l1 = in->mouse.pos;
nk_stroke_curve(canvas, l0.x, l0.y, l0.x + 50.0f, l0.y,
l1.x - 50.0f, l1.y, l1.x, l1.y, 1.0f, nk_rgb(100, 100, 100));
}
}
/* input connector */
space = node.bounds.h / (float)((it->input_count) + 1);
for (n = 0; n < it->input_count; ++n) {
struct nk_rect circle;
circle.x = node.bounds.x-4;
circle.y = node.bounds.y + space * (float)(n+1);
circle.w = 8; circle.h = 8;
nk_fill_circle(canvas, circle, nk_rgb(100, 100, 100));
if (nk_input_is_mouse_released(in, NK_BUTTON_LEFT) &&
nk_input_is_mouse_hovering_rect(in, circle) &&
nodedit->linking.active && nodedit->linking.node != it) {
nodedit->linking.active = nk_false;
node_editor_link(nodedit, nodedit->linking.input_id,
nodedit->linking.input_slot, it->ID, n);
}
}
}
it = it->next;
}
/* reset linking connection */
if (nodedit->linking.active && nk_input_is_mouse_released(in, NK_BUTTON_LEFT)) {
nodedit->linking.active = nk_false;
nodedit->linking.node = NULL;
fprintf(stdout, "linking failed\n");
}
/* draw each link */
for (n = 0; n < nodedit->link_count; ++n) {
struct node_link *link = &nodedit->links[n];
struct node *ni = node_editor_find(nodedit, link->input_id);
struct node *no = node_editor_find(nodedit, link->output_id);
float spacei = node.bounds.h / (float)((ni->output_count) + 1);
float spaceo = node.bounds.h / (float)((no->input_count) + 1);
struct nk_vec2 l0 = nk_layout_space_to_screen(ctx,
nk_vec2(ni->bounds.x + ni->bounds.w, 3.0f + ni->bounds.y + spacei * (float)(link->input_slot+1)));
struct nk_vec2 l1 = nk_layout_space_to_screen(ctx,
nk_vec2(no->bounds.x, 3.0f + no->bounds.y + spaceo * (float)(link->output_slot+1)));
l0.x -= nodedit->scrolling.x;
l0.y -= nodedit->scrolling.y;
l1.x -= nodedit->scrolling.x;
l1.y -= nodedit->scrolling.y;
nk_stroke_curve(canvas, l0.x, l0.y, l0.x + 50.0f, l0.y,
l1.x - 50.0f, l1.y, l1.x, l1.y, 1.0f, nk_rgb(100, 100, 100));
}
if (updated) {
/* reshuffle nodes to have least recently selected node on top */
node_editor_pop(nodedit, updated);
node_editor_push(nodedit, updated);
}
/* node selection */
if (nk_input_mouse_clicked(in, NK_BUTTON_LEFT, nk_layout_space_bounds(ctx))) {
it = nodedit->begin;
nodedit->selected = NULL;
nodedit->bounds = nk_rect(in->mouse.pos.x, in->mouse.pos.y, 100, 200);
while (it) {
struct nk_rect b = nk_layout_space_rect_to_screen(ctx, it->bounds);
b.x -= nodedit->scrolling.x;
b.y -= nodedit->scrolling.y;
if (nk_input_is_mouse_hovering_rect(in, b))
nodedit->selected = it;
it = it->next;
}
}
/* contextual menu */
if (nk_contextual_begin(ctx, &menu, 0, nk_vec2(100, 220), nk_window_get_bounds(ctx))) {
const char *grid_option[] = {"Show Grid", "Hide Grid"};
nk_layout_row_dynamic(ctx, 25, 1);
if (nk_contextual_item_label(ctx, "New", NK_TEXT_CENTERED))
node_editor_add(nodedit, "New", nk_rect(400, 260, 180, 220),
nk_rgb(255, 255, 255), 1, 2);
if (nk_contextual_item_label(ctx, grid_option[nodedit->show_grid],NK_TEXT_CENTERED))
nodedit->show_grid = !nodedit->show_grid;
nk_contextual_end(ctx);
}
}
nk_layout_space_end(ctx);
/* window content scrolling */
if (nk_input_is_mouse_hovering_rect(in, nk_window_get_bounds(ctx)) &&
nk_input_is_mouse_down(in, NK_BUTTON_MIDDLE)) {
nodedit->scrolling.x += in->mouse.delta.x;
nodedit->scrolling.y += in->mouse.delta.y;
}
}
nk_end(ctx);
return !nk_window_is_closed(ctx, "Node Editor");
}
/* ===============================================================
*
* DEVICE
*
* ===============================================================*/
struct device {
struct nk_buffer cmds;
struct nk_draw_null_texture 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;
};
static void
device_init(struct device *dev)
{
GLint status;
static const GLchar *vertex_shader =
"#version 300 es\n"
"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 =
"#version 300 es\n"
"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_draw_vertex);
size_t vp = offsetof(struct nk_draw_vertex, position);
size_t vt = offsetof(struct nk_draw_vertex, uv);
size_t vc = offsetof(struct nk_draw_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)
{
GLint last_prog, last_tex;
GLint last_ebo, last_vbo, last_vao;
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;
/* save previous opengl state */
glGetIntegerv(GL_CURRENT_PROGRAM, &last_prog);
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_tex);
glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_vao);
glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_ebo);
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vbo);
/* 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 converting configuration */
struct nk_convert_config config;
memset(&config, 0, sizeof(config));
config.global_alpha = 1.0f;
config.shape_AA = AA;
config.line_AA = AA;
config.circle_segment_count = 22;
config.curve_segment_count = 22;
config.arc_segment_count = 22;
config.null = dev->null;
/* 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,
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);
}
/* restore old state */
glUseProgram((GLuint)last_prog);
glBindTexture(GL_TEXTURE_2D, (GLuint)last_tex);
glBindBuffer(GL_ARRAY_BUFFER, (GLuint)last_vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, (GLuint)last_ebo);
glBindVertexArray((GLuint)last_vao);
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), (float)yoff);}
int main(int argc, char *argv[])
{
/* Platform */
static GLFWwindow *win;
int width = 0, height = 0;
/* GUI */
struct device device;
struct nk_context ctx;
struct nk_font *font;
struct nk_font_atlas atlas;
struct node_editor node;
/* 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);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL);
glfwMakeContextCurrent(win);
glfwSetWindowUserPointer(win, &ctx);
glfwSetCharCallback(win, text_input);
glfwSetScrollCallback(win, scroll_input);
/* 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;
const char *font_path = (argc > 1) ? argv[1]: 0;
nk_font_atlas_init_default(&atlas);
nk_font_atlas_begin(&atlas);
if (font_path) font = nk_font_atlas_add_from_file(&atlas, font_path, 14.0f, NULL);
else font = nk_font_atlas_add_default(&atlas, 14.0f, NULL);
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.null);}
nk_init_default(&ctx, &font->handle);}
node_editor_init(&node);
while (!glfwWindowShouldClose(win))
{
/* Input */
{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)) {
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);}
/* GUI */
if (!node_editor_run(&node, &ctx)) break;
/* Draw */
glfwGetWindowSize(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;
}
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