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Nuklear/demo/sfml_opengl2/nuklear_sfml_gl2.h

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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_GL2_H_
#define NK_SFML_GL2_H_
#include <SFML/Window.hpp>
#include <SFML/System/Clock.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);
NK_API void nk_sfml_shutdown(void);
#endif
/*
* ==============================================================
*
* IMPLEMENTATION
*
* ===============================================================
*/
#ifdef NK_SFML_GL2_IMPLEMENTATION
#include <cstdlib>
#include <cstring>
struct nk_sfml_device {
struct nk_buffer cmds;
struct nk_draw_null_texture tex_null;
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;
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)
{
/* setup global state */
struct nk_sfml_device* dev = &sfml.ogl;
int window_width = sfml.window->getSize().x;
int window_height = sfml.window->getSize().y;
sfml.ctx.delta_time_seconds = (float)((double)sfml.frame_delta_clock->getElapsedTime().asMicroseconds() / 1000000);
sfml.frame_delta_clock->restart();
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);
glViewport(0, 0, (GLsizei)window_width, (GLsizei)window_height);
glMatrixMode(GL_TEXTURE);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0f, window_width, window_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_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);
/* 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_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;
/* convert shapes into vertices */
nk_buffer_init_default(&vbuf);
nk_buffer_init_default(&ebuf);
nk_convert(&sfml.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, &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);
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_TEXTURE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
}
static void
nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
{
#if 0
/* Not Implemented in SFML */
sf::Clipboard clipboard(sfml.window);
const char* text = clipboard.getText();
if(text)
nk_textedit_paste(edit, text, nk_strlen(text));
(void)usr;
#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_buffer_init_default(&sfml.ogl.cmds);
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()
{
int w, h;
const void* img;
img = nk_font_atlas_bake(&sfml.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
nk_sfml_device_upload_atlas(img, 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::Return)
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;
ctx->input.mouse.pos.x = x;
ctx->input.mouse.pos.y = 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) {
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(void)
{
struct nk_sfml_device* dev = &sfml.ogl;
nk_font_atlas_clear(&sfml.atlas);
nk_free(&sfml.ctx);
glDeleteTextures(1, &dev->font_tex);
nk_buffer_free(&dev->cmds);
delete sfml.frame_delta_clock;
memset(&sfml, 0, sizeof(sfml));
}
#endif
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