460 lines
17 KiB
C
460 lines
17 KiB
C
/*
|
|
* Nuklear - 1.32.0 - public domain
|
|
* no warrenty implied; use at your own risk.
|
|
* authored from 2015-2016 by Micha Mettke
|
|
*/
|
|
/*
|
|
* ==============================================================
|
|
*
|
|
* API
|
|
*
|
|
* ===============================================================
|
|
*/
|
|
#ifndef NK_SDL_GL3_H_
|
|
#define NK_SDL_GL3_H_
|
|
|
|
#include <SDL2/SDL.h>
|
|
#include <SDL2/SDL_opengl.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);
|
|
NK_API void nk_sdl_device_destroy(void);
|
|
NK_API void nk_sdl_device_create(void);
|
|
|
|
#endif
|
|
|
|
/*
|
|
* ==============================================================
|
|
*
|
|
* IMPLEMENTATION
|
|
*
|
|
* ===============================================================
|
|
*/
|
|
#ifdef NK_SDL_GL3_IMPLEMENTATION
|
|
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
struct nk_sdl_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_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;
|
|
|
|
#ifdef __APPLE__
|
|
#define NK_SHADER_VERSION "#version 150\n"
|
|
#else
|
|
#define NK_SHADER_VERSION "#version 300 es\n"
|
|
#endif
|
|
NK_API void
|
|
nk_sdl_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_sdl_device *dev = &sdl.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_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);
|
|
|
|
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_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_device_destroy(void)
|
|
{
|
|
struct nk_sdl_device *dev = &sdl.ogl;
|
|
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);
|
|
}
|
|
|
|
NK_API void
|
|
nk_sdl_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
|
|
{
|
|
struct nk_sdl_device *dev = &sdl.ogl;
|
|
int width, height;
|
|
int display_width, display_height;
|
|
struct nk_vec2 scale;
|
|
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},
|
|
};
|
|
SDL_GetWindowSize(sdl.win, &width, &height);
|
|
SDL_GL_GetDrawableSize(sdl.win, &display_width, &display_height);
|
|
ortho[0][0] /= (GLfloat)width;
|
|
ortho[1][1] /= (GLfloat)height;
|
|
|
|
scale.x = (float)display_width/(float)width;
|
|
scale.y = (float)display_height/(float)height;
|
|
|
|
/* setup global state */
|
|
glViewport(0,0,display_width,display_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;
|
|
struct nk_buffer vbuf, ebuf;
|
|
|
|
/* 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_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}
|
|
};
|
|
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.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 */
|
|
nk_buffer_init_fixed(&vbuf, vertices, (nk_size)max_vertex_buffer);
|
|
nk_buffer_init_fixed(&ebuf, elements, (nk_size)max_element_buffer);
|
|
nk_convert(&sdl.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, &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_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_sdl_clipboard_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_clipboard_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_clipboard_copy;
|
|
sdl.ctx.clip.paste = nk_sdl_clipboard_paste;
|
|
sdl.ctx.clip.userdata = nk_handle_ptr(0);
|
|
nk_sdl_device_create();
|
|
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.tex_null);
|
|
if (sdl.atlas.default_font)
|
|
nk_style_set_font(&sdl.ctx, &sdl.atlas.default_font->handle);
|
|
|
|
}
|
|
|
|
NK_API void
|
|
nk_sdl_handle_grab(void)
|
|
{
|
|
struct nk_context *ctx = &sdl.ctx;
|
|
if (ctx->input.mouse.grab) {
|
|
SDL_SetRelativeMouseMode(SDL_TRUE);
|
|
} else if (ctx->input.mouse.ungrab) {
|
|
/* better support for older SDL by setting mode first; causes an extra mouse motion event */
|
|
SDL_SetRelativeMouseMode(SDL_FALSE);
|
|
SDL_WarpMouseInWindow(sdl.win, (int)ctx->input.mouse.prev.x, (int)ctx->input.mouse.prev.y);
|
|
} else if (ctx->input.mouse.grabbed) {
|
|
ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
|
|
ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
|
|
}
|
|
}
|
|
|
|
NK_API int
|
|
nk_sdl_handle_event(SDL_Event *evt)
|
|
{
|
|
struct nk_context *ctx = &sdl.ctx;
|
|
|
|
switch(evt->type)
|
|
{
|
|
case SDL_KEYUP: /* KEYUP & KEYDOWN share same routine */
|
|
case SDL_KEYDOWN:
|
|
{
|
|
int down = evt->type == SDL_KEYDOWN;
|
|
const Uint8* state = SDL_GetKeyboardState(0);
|
|
switch(evt->key.keysym.sym)
|
|
{
|
|
case SDLK_RSHIFT: /* RSHIFT & LSHIFT share same routine */
|
|
case SDLK_LSHIFT: nk_input_key(ctx, NK_KEY_SHIFT, down); break;
|
|
case SDLK_DELETE: nk_input_key(ctx, NK_KEY_DEL, down); break;
|
|
case SDLK_RETURN: nk_input_key(ctx, NK_KEY_ENTER, down); break;
|
|
case SDLK_TAB: nk_input_key(ctx, NK_KEY_TAB, down); break;
|
|
case SDLK_BACKSPACE: nk_input_key(ctx, NK_KEY_BACKSPACE, down); break;
|
|
case SDLK_HOME: nk_input_key(ctx, NK_KEY_TEXT_START, down);
|
|
nk_input_key(ctx, NK_KEY_SCROLL_START, down); break;
|
|
case SDLK_END: nk_input_key(ctx, NK_KEY_TEXT_END, down);
|
|
nk_input_key(ctx, NK_KEY_SCROLL_END, down); break;
|
|
case SDLK_PAGEDOWN: nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down); break;
|
|
case SDLK_PAGEUP: nk_input_key(ctx, NK_KEY_SCROLL_UP, down); break;
|
|
case SDLK_z: nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_r: nk_input_key(ctx, NK_KEY_TEXT_REDO, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_c: nk_input_key(ctx, NK_KEY_COPY, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_v: nk_input_key(ctx, NK_KEY_PASTE, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_x: nk_input_key(ctx, NK_KEY_CUT, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_b: nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_e: nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && state[SDL_SCANCODE_LCTRL]); break;
|
|
case SDLK_UP: nk_input_key(ctx, NK_KEY_UP, down); break;
|
|
case SDLK_DOWN: nk_input_key(ctx, NK_KEY_DOWN, down); break;
|
|
case 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);
|
|
break;
|
|
case 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);
|
|
break;
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
case SDL_MOUSEBUTTONUP: /* MOUSEBUTTONUP & MOUSEBUTTONDOWN share same routine */
|
|
case SDL_MOUSEBUTTONDOWN:
|
|
{
|
|
int down = evt->type == SDL_MOUSEBUTTONDOWN;
|
|
const int x = evt->button.x, y = evt->button.y;
|
|
switch(evt->button.button)
|
|
{
|
|
case SDL_BUTTON_LEFT:
|
|
if (evt->button.clicks > 1)
|
|
nk_input_button(ctx, NK_BUTTON_DOUBLE, x, y, down);
|
|
nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down); break;
|
|
case SDL_BUTTON_MIDDLE: nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down); break;
|
|
case SDL_BUTTON_RIGHT: nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down); break;
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
case 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;
|
|
|
|
case SDL_TEXTINPUT:
|
|
{
|
|
nk_glyph glyph;
|
|
memcpy(glyph, evt->text.text, NK_UTF_SIZE);
|
|
nk_input_glyph(ctx, glyph);
|
|
}
|
|
return 1;
|
|
|
|
case SDL_MOUSEWHEEL:
|
|
nk_input_scroll(ctx,nk_vec2((float)evt->wheel.x,(float)evt->wheel.y));
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
NK_API
|
|
void nk_sdl_shutdown(void)
|
|
{
|
|
nk_font_atlas_clear(&sdl.atlas);
|
|
nk_free(&sdl.ctx);
|
|
nk_sdl_device_destroy();
|
|
memset(&sdl, 0, sizeof(sdl));
|
|
}
|
|
|
|
#endif
|