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demo/glfw_opengl3 Remove global state

This commit is contained in:
Richard Gill 2020-04-30 15:17:24 +02:00
parent 9f0bca461b
commit fe01ff52eb
2 changed files with 99 additions and 92 deletions
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13
demo/glfw_opengl3/main.c
View File

@ -75,6 +75,7 @@ static void error_callback(int e, const char *d)
int main(void)
{
/* Platform */
struct nk_glfw glfw = {0};
static GLFWwindow *win;
int width = 0, height = 0;
struct nk_context *ctx;
@ -104,18 +105,18 @@ int main(void)
exit(1);
}
ctx = nk_glfw3_init(win, NK_GLFW3_INSTALL_CALLBACKS);
ctx = nk_glfw3_init(&glfw, win, NK_GLFW3_INSTALL_CALLBACKS);
/* Load Fonts: if none of these are loaded a default font will be used */
/* Load Cursor: if you uncomment cursor loading please hide the cursor */
{struct nk_font_atlas *atlas;
nk_glfw3_font_stash_begin(&atlas);
nk_glfw3_font_stash_begin(&glfw, &atlas);
/*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
/*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
/*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
/*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
/*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
/*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
nk_glfw3_font_stash_end();
nk_glfw3_font_stash_end(&glfw);
/*nk_style_load_all_cursors(ctx, atlas->cursors);*/
/*nk_style_set_font(ctx, &droid->handle);*/}
@ -131,7 +132,7 @@ int main(void)
{
/* Input */
glfwPollEvents();
nk_glfw3_new_frame();
nk_glfw3_new_frame(&glfw);
/* GUI */
if (nk_begin(ctx, "Demo", nk_rect(50, 50, 230, 250),
@ -190,10 +191,10 @@ int main(void)
* defaults everything back into a default state.
* Make sure to either a.) save and restore or b.) reset your own state after
* rendering the UI. */
nk_glfw3_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
nk_glfw3_render(&glfw, NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
glfwSwapBuffers(win);
}
nk_glfw3_shutdown();
nk_glfw3_shutdown(&glfw);
glfwTerminate();
return 0;
}

178
demo/glfw_opengl3/nuklear_glfw_gl3.h
View File

@ -20,15 +20,17 @@ enum nk_glfw_init_state{
NK_GLFW3_INSTALL_CALLBACKS
};
NK_API struct nk_context* nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state);
NK_API void nk_glfw3_shutdown(void);
NK_API void nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas);
NK_API void nk_glfw3_font_stash_end(void);
NK_API void nk_glfw3_new_frame(void);
NK_API void nk_glfw3_render(enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
struct nk_glfw;
NK_API void nk_glfw3_device_destroy(void);
NK_API void nk_glfw3_device_create(void);
NK_API struct nk_context* nk_glfw3_init(struct nk_glfw* glfw, GLFWwindow *win, enum nk_glfw_init_state);
NK_API void nk_glfw3_shutdown(struct nk_glfw* glfw);
NK_API void nk_glfw3_font_stash_begin(struct nk_glfw* glfw, struct nk_font_atlas **atlas);
NK_API void nk_glfw3_font_stash_end(struct nk_glfw* glfw);
NK_API void nk_glfw3_new_frame(struct nk_glfw* glfw);
NK_API void nk_glfw3_render(struct nk_glfw* glfw, enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
NK_API void nk_glfw3_device_destroy(struct nk_glfw* glfw);
NK_API void nk_glfw3_device_create(struct nk_glfw* glfw);
NK_API void nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint);
NK_API void nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff);
@ -75,7 +77,7 @@ struct nk_glfw_vertex {
nk_byte col[4];
};
static struct nk_glfw {
struct nk_glfw {
GLFWwindow *win;
int width, height;
int display_width, display_height;
@ -89,7 +91,7 @@ static struct nk_glfw {
double last_button_click;
int is_double_click_down;
struct nk_vec2 double_click_pos;
} glfw;
};
#ifdef __APPLE__
#define NK_SHADER_VERSION "#version 150\n"
@ -98,7 +100,7 @@ static struct nk_glfw {
#endif
NK_API void
nk_glfw3_device_create(void)
nk_glfw3_device_create(struct nk_glfw* glfw)
{
GLint status;
static const GLchar *vertex_shader =
@ -125,7 +127,7 @@ nk_glfw3_device_create(void)
" Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
"}\n";
struct nk_glfw_device *dev = &glfw.ogl;
struct nk_glfw_device *dev = &glfw->ogl;
nk_buffer_init_default(&dev->cmds);
dev->prog = glCreateProgram();
dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
@ -181,9 +183,9 @@ nk_glfw3_device_create(void)
}
NK_INTERN void
nk_glfw3_device_upload_atlas(const void *image, int width, int height)
nk_glfw3_device_upload_atlas(struct nk_glfw* glfw, const void *image, int width, int height)
{
struct nk_glfw_device *dev = &glfw.ogl;
struct nk_glfw_device *dev = &glfw->ogl;
glGenTextures(1, &dev->font_tex);
glBindTexture(GL_TEXTURE_2D, dev->font_tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@ -193,9 +195,9 @@ nk_glfw3_device_upload_atlas(const void *image, int width, int height)
}
NK_API void
nk_glfw3_device_destroy(void)
nk_glfw3_device_destroy(struct nk_glfw* glfw)
{
struct nk_glfw_device *dev = &glfw.ogl;
struct nk_glfw_device *dev = &glfw->ogl;
glDetachShader(dev->prog, dev->vert_shdr);
glDetachShader(dev->prog, dev->frag_shdr);
glDeleteShader(dev->vert_shdr);
@ -208,9 +210,9 @@ nk_glfw3_device_destroy(void)
}
NK_API void
nk_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
nk_glfw3_render(struct nk_glfw* glfw, enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
{
struct nk_glfw_device *dev = &glfw.ogl;
struct nk_glfw_device *dev = &glfw->ogl;
struct nk_buffer vbuf, ebuf;
GLfloat ortho[4][4] = {
{2.0f, 0.0f, 0.0f, 0.0f},
@ -218,8 +220,8 @@ nk_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element
{0.0f, 0.0f,-1.0f, 0.0f},
{-1.0f,1.0f, 0.0f, 1.0f},
};
ortho[0][0] /= (GLfloat)glfw.width;
ortho[1][1] /= (GLfloat)glfw.height;
ortho[0][0] /= (GLfloat)glfw->width;
ortho[1][1] /= (GLfloat)glfw->height;
/* setup global state */
glEnable(GL_BLEND);
@ -234,7 +236,7 @@ nk_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element
glUseProgram(dev->prog);
glUniform1i(dev->uniform_tex, 0);
glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
glViewport(0,0,(GLsizei)glfw.display_width,(GLsizei)glfw.display_height);
glViewport(0,0,(GLsizei)glfw->display_width,(GLsizei)glfw->display_height);
{
/* convert from command queue into draw list and draw to screen */
const struct nk_draw_command *cmd;
@ -276,25 +278,25 @@ nk_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element
/* setup buffers to load vertices and elements */
nk_buffer_init_fixed(&vbuf, vertices, (size_t)max_vertex_buffer);
nk_buffer_init_fixed(&ebuf, elements, (size_t)max_element_buffer);
nk_convert(&glfw.ctx, &dev->cmds, &vbuf, &ebuf, &config);
nk_convert(&glfw->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, &glfw.ctx, &dev->cmds)
nk_draw_foreach(cmd, &glfw->ctx, &dev->cmds)
{
if (!cmd->elem_count) continue;
glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
glScissor(
(GLint)(cmd->clip_rect.x * glfw.fb_scale.x),
(GLint)((glfw.height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * glfw.fb_scale.y),
(GLint)(cmd->clip_rect.w * glfw.fb_scale.x),
(GLint)(cmd->clip_rect.h * glfw.fb_scale.y));
(GLint)(cmd->clip_rect.x * glfw->fb_scale.x),
(GLint)((glfw->height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * glfw->fb_scale.y),
(GLint)(cmd->clip_rect.w * glfw->fb_scale.x),
(GLint)(cmd->clip_rect.h * glfw->fb_scale.y));
glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
offset += cmd->elem_count;
}
nk_clear(&glfw.ctx);
nk_clear(&glfw->ctx);
nk_buffer_clear(&dev->cmds);
}
@ -310,39 +312,42 @@ nk_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element
NK_API void
nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint)
{
(void)win;
if (glfw.text_len < NK_GLFW_TEXT_MAX)
glfw.text[glfw.text_len++] = codepoint;
struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
if (glfw->text_len < NK_GLFW_TEXT_MAX)
glfw->text[glfw->text_len++] = codepoint;
}
NK_API void
nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff)
{
(void)win; (void)xoff;
glfw.scroll.x += (float)xoff;
glfw.scroll.y += (float)yoff;
struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
(void)xoff;
glfw->scroll.x += (float)xoff;
glfw->scroll.y += (float)yoff;
}
NK_API void
nk_glfw3_mouse_button_callback(GLFWwindow* window, int button, int action, int mods)
nk_glfw3_mouse_button_callback(GLFWwindow* win, int button, int action, int mods)
{
double x, y;
if (button != GLFW_MOUSE_BUTTON_LEFT) return;
glfwGetCursorPos(window, &x, &y);
struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
glfwGetCursorPos(win, &x, &y);
if (action == GLFW_PRESS) {
double dt = glfwGetTime() - glfw.last_button_click;
double dt = glfwGetTime() - glfw->last_button_click;
if (dt > NK_GLFW_DOUBLE_CLICK_LO && dt < NK_GLFW_DOUBLE_CLICK_HI) {
glfw.is_double_click_down = nk_true;
glfw.double_click_pos = nk_vec2((float)x, (float)y);
glfw->is_double_click_down = nk_true;
glfw->double_click_pos = nk_vec2((float)x, (float)y);
}
glfw.last_button_click = glfwGetTime();
} else glfw.is_double_click_down = nk_false;
glfw->last_button_click = glfwGetTime();
} else glfw->is_double_click_down = nk_false;
}
NK_INTERN void
nk_glfw3_clipboard_paste(nk_handle usr, struct nk_text_edit *edit)
{
const char *text = glfwGetClipboardString(glfw.win);
struct nk_glfw* glfw = usr.ptr;
const char *text = glfwGetClipboardString(glfw->win);
if (text) nk_textedit_paste(edit, text, nk_strlen(text));
(void)usr;
}
@ -351,80 +356,81 @@ NK_INTERN void
nk_glfw3_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';
glfwSetClipboardString(glfw.win, str);
struct nk_glfw* glfw = usr.ptr;
glfwSetClipboardString(glfw->win, str);
free(str);
}
NK_API struct nk_context*
nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state init_state)
nk_glfw3_init(struct nk_glfw* glfw, GLFWwindow *win, enum nk_glfw_init_state init_state)
{
glfw.win = win;
glfwSetWindowUserPointer(win, glfw);
glfw->win = win;
if (init_state == NK_GLFW3_INSTALL_CALLBACKS) {
glfwSetScrollCallback(win, nk_gflw3_scroll_callback);
glfwSetCharCallback(win, nk_glfw3_char_callback);
glfwSetMouseButtonCallback(win, nk_glfw3_mouse_button_callback);
}
nk_init_default(&glfw.ctx, 0);
glfw.ctx.clip.copy = nk_glfw3_clipboard_copy;
glfw.ctx.clip.paste = nk_glfw3_clipboard_paste;
glfw.ctx.clip.userdata = nk_handle_ptr(0);
glfw.last_button_click = 0;
nk_glfw3_device_create();
nk_init_default(&glfw->ctx, 0);
glfw->ctx.clip.copy = nk_glfw3_clipboard_copy;
glfw->ctx.clip.paste = nk_glfw3_clipboard_paste;
glfw->ctx.clip.userdata = nk_handle_ptr(0);
glfw->last_button_click = 0;
nk_glfw3_device_create(glfw);
glfw.is_double_click_down = nk_false;
glfw.double_click_pos = nk_vec2(0, 0);
glfw->is_double_click_down = nk_false;
glfw->double_click_pos = nk_vec2(0, 0);
return &glfw.ctx;
return &glfw->ctx;
}
NK_API void
nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas)
nk_glfw3_font_stash_begin(struct nk_glfw* glfw, struct nk_font_atlas **atlas)
{
nk_font_atlas_init_default(&glfw.atlas);
nk_font_atlas_begin(&glfw.atlas);
*atlas = &glfw.atlas;
nk_font_atlas_init_default(&glfw->atlas);
nk_font_atlas_begin(&glfw->atlas);
*atlas = &glfw->atlas;
}
NK_API void
nk_glfw3_font_stash_end(void)
nk_glfw3_font_stash_end(struct nk_glfw* glfw)
{
const void *image; int w, h;
image = nk_font_atlas_bake(&glfw.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
nk_glfw3_device_upload_atlas(image, w, h);
nk_font_atlas_end(&glfw.atlas, nk_handle_id((int)glfw.ogl.font_tex), &glfw.ogl.null);
if (glfw.atlas.default_font)
nk_style_set_font(&glfw.ctx, &glfw.atlas.default_font->handle);
image = nk_font_atlas_bake(&glfw->atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
nk_glfw3_device_upload_atlas(glfw, image, w, h);
nk_font_atlas_end(&glfw->atlas, nk_handle_id((int)glfw->ogl.font_tex), &glfw->ogl.null);
if (glfw->atlas.default_font)
nk_style_set_font(&glfw->ctx, &glfw->atlas.default_font->handle);
}
NK_API void
nk_glfw3_new_frame(void)
nk_glfw3_new_frame(struct nk_glfw* glfw)
{
int i;
double x, y;
struct nk_context *ctx = &glfw.ctx;
struct GLFWwindow *win = glfw.win;
struct nk_context *ctx = &glfw->ctx;
struct GLFWwindow *win = glfw->win;
glfwGetWindowSize(win, &glfw.width, &glfw.height);
glfwGetFramebufferSize(win, &glfw.display_width, &glfw.display_height);
glfw.fb_scale.x = (float)glfw.display_width/(float)glfw.width;
glfw.fb_scale.y = (float)glfw.display_height/(float)glfw.height;
glfwGetWindowSize(win, &glfw->width, &glfw->height);
glfwGetFramebufferSize(win, &glfw->display_width, &glfw->display_height);
glfw->fb_scale.x = (float)glfw->display_width/(float)glfw->width;
glfw->fb_scale.y = (float)glfw->display_height/(float)glfw->height;
nk_input_begin(ctx);
for (i = 0; i < glfw.text_len; ++i)
nk_input_unicode(ctx, glfw.text[i]);
for (i = 0; i < glfw->text_len; ++i)
nk_input_unicode(ctx, glfw->text[i]);
#ifdef NK_GLFW_GL3_MOUSE_GRABBING
/* optional grabbing behavior */
if (ctx->input.mouse.grab)
glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
else if (ctx->input.mouse.ungrab)
glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
glfwSetInputMode(glfw->win, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
#endif
nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
@ -466,7 +472,7 @@ nk_glfw3_new_frame(void)
nk_input_motion(ctx, (int)x, (int)y);
#ifdef NK_GLFW_GL3_MOUSE_GRABBING
if (ctx->input.mouse.grabbed) {
glfwSetCursorPos(glfw.win, ctx->input.mouse.prev.x, ctx->input.mouse.prev.y);
glfwSetCursorPos(glfw->win, ctx->input.mouse.prev.x, ctx->input.mouse.prev.y);
ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
}
@ -474,20 +480,20 @@ nk_glfw3_new_frame(void)
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_button(ctx, NK_BUTTON_DOUBLE, (int)glfw.double_click_pos.x, (int)glfw.double_click_pos.y, glfw.is_double_click_down);
nk_input_scroll(ctx, glfw.scroll);
nk_input_end(&glfw.ctx);
glfw.text_len = 0;
glfw.scroll = nk_vec2(0,0);
nk_input_button(ctx, NK_BUTTON_DOUBLE, (int)glfw->double_click_pos.x, (int)glfw->double_click_pos.y, glfw->is_double_click_down);
nk_input_scroll(ctx, glfw->scroll);
nk_input_end(&glfw->ctx);
glfw->text_len = 0;
glfw->scroll = nk_vec2(0,0);
}
NK_API
void nk_glfw3_shutdown(void)
void nk_glfw3_shutdown(struct nk_glfw* glfw)
{
nk_font_atlas_clear(&glfw.atlas);
nk_free(&glfw.ctx);
nk_glfw3_device_destroy();
memset(&glfw, 0, sizeof(glfw));
nk_font_atlas_clear(&glfw->atlas);
nk_free(&glfw->ctx);
nk_glfw3_device_destroy(glfw);
memset(glfw, 0, sizeof(glfw));
}
#endif