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Diffstat (limited to 'nuklear/demo/glfw_opengl3/nuklear_glfw_gl3.h')
-rw-r--r--nuklear/demo/glfw_opengl3/nuklear_glfw_gl3.h456
1 files changed, 456 insertions, 0 deletions
diff --git a/nuklear/demo/glfw_opengl3/nuklear_glfw_gl3.h b/nuklear/demo/glfw_opengl3/nuklear_glfw_gl3.h
new file mode 100644
index 0000000..aabb365
--- /dev/null
+++ b/nuklear/demo/glfw_opengl3/nuklear_glfw_gl3.h
@@ -0,0 +1,456 @@
+/*
+ * Nuklear - v1.17 - public domain
+ * no warrenty implied; use at your own risk.
+ * authored from 2015-2016 by Micha Mettke
+ */
+/*
+ * ==============================================================
+ *
+ * API
+ *
+ * ===============================================================
+ */
+#ifndef NK_GLFW_GL3_H_
+#define NK_GLFW_GL3_H_
+
+#include <GLFW/glfw3.h>
+
+enum nk_glfw_init_state{
+ NK_GLFW3_DEFAULT=0,
+ 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);
+
+NK_API void nk_glfw3_device_destroy(void);
+NK_API void nk_glfw3_device_create(void);
+
+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);
+
+#endif
+/*
+ * ==============================================================
+ *
+ * IMPLEMENTATION
+ *
+ * ===============================================================
+ */
+#ifdef NK_GLFW_GL3_IMPLEMENTATION
+
+#ifndef NK_GLFW_TEXT_MAX
+#define NK_GLFW_TEXT_MAX 256
+#endif
+
+struct nk_glfw_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;
+};
+
+struct nk_glfw_vertex {
+ float position[2];
+ float uv[2];
+ nk_byte col[4];
+};
+
+static struct nk_glfw {
+ GLFWwindow *win;
+ int width, height;
+ int display_width, display_height;
+ struct nk_glfw_device ogl;
+ struct nk_context ctx;
+ struct nk_font_atlas atlas;
+ struct nk_vec2 fb_scale;
+ unsigned int text[NK_GLFW_TEXT_MAX];
+ int text_len;
+ float scroll;
+} glfw;
+
+#ifdef __APPLE__
+ #define NK_SHADER_VERSION "#version 150\n"
+#else
+ #define NK_SHADER_VERSION "#version 300 es\n"
+#endif
+
+NK_API void
+nk_glfw3_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_glfw_device *dev = &glfw.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_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);
+}
+
+NK_INTERN void
+nk_glfw3_device_upload_atlas(const void *image, int width, int height)
+{
+ 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);
+ 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_glfw3_device_destroy(void)
+{
+ struct nk_glfw_device *dev = &glfw.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_glfw3_render(enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
+{
+ struct nk_glfw_device *dev = &glfw.ogl;
+ 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)glfw.width;
+ ortho[1][1] /= (GLfloat)glfw.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]);
+ 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;
+ 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_buffer, NULL, GL_STREAM_DRAW);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, max_element_buffer, 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.null = dev->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, (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);}
+ }
+ glUnmapBuffer(GL_ARRAY_BUFFER);
+ glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
+
+ /* iterate over and execute each draw command */
+ 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));
+ glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
+ offset += cmd->elem_count;
+ }
+ nk_clear(&glfw.ctx);
+ }
+
+ /* 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);
+}
+
+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;
+}
+
+NK_API void
+nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff)
+{
+ (void)win; (void)xoff;
+ glfw.scroll += (float)yoff;
+}
+
+NK_INTERN void
+nk_glfw3_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
+{
+ const char *text = glfwGetClipboardString(glfw.win);
+ if (text) nk_textedit_paste(edit, text, nk_strlen(text));
+ (void)usr;
+}
+
+NK_INTERN void
+nk_glfw3_clipbard_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);
+ free(str);
+}
+
+NK_API struct nk_context*
+nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state init_state)
+{
+ glfw.win = win;
+ if (init_state == NK_GLFW3_INSTALL_CALLBACKS) {
+ glfwSetScrollCallback(win, nk_gflw3_scroll_callback);
+ glfwSetCharCallback(win, nk_glfw3_char_callback);
+ }
+
+ nk_init_default(&glfw.ctx, 0);
+ glfw.ctx.clip.copy = nk_glfw3_clipbard_copy;
+ glfw.ctx.clip.paste = nk_glfw3_clipbard_paste;
+ glfw.ctx.clip.userdata = nk_handle_ptr(0);
+ nk_glfw3_device_create();
+ return &glfw.ctx;
+}
+
+NK_API void
+nk_glfw3_font_stash_begin(struct nk_font_atlas **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)
+{
+ 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);
+}
+
+NK_API void
+nk_glfw3_new_frame(void)
+{
+ int i;
+ double x, y;
+ 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;
+
+ nk_input_begin(ctx);
+ for (i = 0; i < glfw.text_len; ++i)
+ nk_input_unicode(ctx, glfw.text[i]);
+
+ /* 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);
+
+ 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_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_SCROLL_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_SCROLL_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_SCROLL_DOWN, glfwGetKey(win, GLFW_KEY_PAGE_DOWN) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_SCROLL_UP, glfwGetKey(win, GLFW_KEY_PAGE_UP) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_SHIFT, glfwGetKey(win, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS||
+ glfwGetKey(win, GLFW_KEY_RIGHT_SHIFT) == 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_TEXT_UNDO, glfwGetKey(win, GLFW_KEY_Z) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_REDO, glfwGetKey(win, GLFW_KEY_R) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_LINE_START, glfwGetKey(win, GLFW_KEY_B) == GLFW_PRESS);
+ nk_input_key(ctx, NK_KEY_TEXT_LINE_END, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
+ } else {
+ 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_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);
+ if (ctx->input.mouse.grabbed) {
+ 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;
+ }
+
+ 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_scroll(ctx, glfw.scroll);
+ nk_input_end(&glfw.ctx);
+ glfw.text_len = 0;
+ glfw.scroll = 0;
+}
+
+NK_API
+void nk_glfw3_shutdown(void)
+{
+ nk_font_atlas_clear(&glfw.atlas);
+ nk_free(&glfw.ctx);
+ nk_glfw3_device_destroy();
+ memset(&glfw, 0, sizeof(glfw));
+}
+
+#endif