382 lines
14 KiB
C
382 lines
14 KiB
C
/*
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* Nuklear - v1.32.0 - public domain
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* no warrenty implied; use at your own risk.
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* authored from 2015-2017 by Micha Mettke
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*/
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/*
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* ==============================================================
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*
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* API
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*
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* ===============================================================
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*/
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#ifndef NK_GLFW_GL2_H_
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#define NK_GLFW_GL2_H_
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#include <GLFW/glfw3.h>
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enum nk_glfw_init_state{
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NK_GLFW3_DEFAULT = 0,
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NK_GLFW3_INSTALL_CALLBACKS
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};
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NK_API struct nk_context* nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state);
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NK_API void nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas);
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NK_API void nk_glfw3_font_stash_end(void);
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NK_API void nk_glfw3_new_frame(void);
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NK_API void nk_glfw3_render(enum nk_anti_aliasing);
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NK_API void nk_glfw3_shutdown(void);
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NK_API void nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint);
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NK_API void nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff);
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#endif
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/*
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* ==============================================================
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*
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* IMPLEMENTATION
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*
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* ===============================================================
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*/
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#ifdef NK_GLFW_GL2_IMPLEMENTATION
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#ifndef NK_GLFW_TEXT_MAX
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#define NK_GLFW_TEXT_MAX 256
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#endif
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#ifndef NK_GLFW_DOUBLE_CLICK_LO
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#define NK_GLFW_DOUBLE_CLICK_LO 0.02
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#endif
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#ifndef NK_GLFW_DOUBLE_CLICK_HI
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#define NK_GLFW_DOUBLE_CLICK_HI 0.2
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#endif
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struct nk_glfw_device {
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struct nk_buffer cmds;
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struct nk_draw_null_texture null;
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GLuint font_tex;
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};
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struct nk_glfw_vertex {
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float position[2];
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float uv[2];
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nk_byte col[4];
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};
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static struct nk_glfw {
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GLFWwindow *win;
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int width, height;
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int display_width, display_height;
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struct nk_glfw_device ogl;
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struct nk_context ctx;
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struct nk_font_atlas atlas;
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struct nk_vec2 fb_scale;
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unsigned int text[NK_GLFW_TEXT_MAX];
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int text_len;
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struct nk_vec2 scroll;
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double last_button_click;
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int is_double_click_down;
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struct nk_vec2 double_click_pos;
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} glfw;
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NK_INTERN void
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nk_glfw3_device_upload_atlas(const void *image, int width, int height)
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{
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struct nk_glfw_device *dev = &glfw.ogl;
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glGenTextures(1, &dev->font_tex);
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glBindTexture(GL_TEXTURE_2D, dev->font_tex);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image);
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}
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NK_API void
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nk_glfw3_render(enum nk_anti_aliasing AA)
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{
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/* setup global state */
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struct nk_glfw_device *dev = &glfw.ogl;
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glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT|GL_TRANSFORM_BIT);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_SCISSOR_TEST);
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glEnable(GL_BLEND);
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glEnable(GL_TEXTURE_2D);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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/* setup viewport/project */
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glViewport(0,0,(GLsizei)glfw.display_width,(GLsizei)glfw.display_height);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(0.0f, glfw.width, glfw.height, 0.0f, -1.0f, 1.0f);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glEnableClientState(GL_COLOR_ARRAY);
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{
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GLsizei vs = sizeof(struct nk_glfw_vertex);
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size_t vp = offsetof(struct nk_glfw_vertex, position);
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size_t vt = offsetof(struct nk_glfw_vertex, uv);
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size_t vc = offsetof(struct nk_glfw_vertex, col);
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/* convert from command queue into draw list and draw to screen */
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const struct nk_draw_command *cmd;
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const nk_draw_index *offset = NULL;
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struct nk_buffer vbuf, ebuf;
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/* fill convert configuration */
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struct nk_convert_config config;
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static const struct nk_draw_vertex_layout_element vertex_layout[] = {
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{NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, position)},
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{NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)},
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{NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)},
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{NK_VERTEX_LAYOUT_END}
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};
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NK_MEMSET(&config, 0, sizeof(config));
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config.vertex_layout = vertex_layout;
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config.vertex_size = sizeof(struct nk_glfw_vertex);
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config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_vertex);
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config.null = dev->null;
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config.circle_segment_count = 22;
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config.curve_segment_count = 22;
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config.arc_segment_count = 22;
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config.global_alpha = 1.0f;
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config.shape_AA = AA;
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config.line_AA = AA;
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/* convert shapes into vertexes */
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nk_buffer_init_default(&vbuf);
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nk_buffer_init_default(&ebuf);
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nk_convert(&glfw.ctx, &dev->cmds, &vbuf, &ebuf, &config);
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/* setup vertex buffer pointer */
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{const void *vertices = nk_buffer_memory_const(&vbuf);
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glVertexPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vp));
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glTexCoordPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vt));
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glColorPointer(4, GL_UNSIGNED_BYTE, vs, (const void*)((const nk_byte*)vertices + vc));}
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/* iterate over and execute each draw command */
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offset = (const nk_draw_index*)nk_buffer_memory_const(&ebuf);
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nk_draw_foreach(cmd, &glfw.ctx, &dev->cmds)
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{
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if (!cmd->elem_count) continue;
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glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
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glScissor(
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(GLint)(cmd->clip_rect.x * glfw.fb_scale.x),
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(GLint)((glfw.height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * glfw.fb_scale.y),
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(GLint)(cmd->clip_rect.w * glfw.fb_scale.x),
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(GLint)(cmd->clip_rect.h * glfw.fb_scale.y));
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glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
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offset += cmd->elem_count;
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}
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nk_clear(&glfw.ctx);
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nk_buffer_free(&vbuf);
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nk_buffer_free(&ebuf);
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}
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/* default OpenGL state */
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glDisableClientState(GL_VERTEX_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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glDisableClientState(GL_COLOR_ARRAY);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_SCISSOR_TEST);
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glDisable(GL_BLEND);
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glDisable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, 0);
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glPopAttrib();
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}
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NK_API void
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nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint)
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{
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(void)win;
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if (glfw.text_len < NK_GLFW_TEXT_MAX)
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glfw.text[glfw.text_len++] = codepoint;
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}
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NK_API void
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nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff)
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{
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(void)win; (void)xoff;
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glfw.scroll.x += (float)xoff;
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glfw.scroll.y += (float)yoff;
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}
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NK_API void
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nk_glfw3_mouse_button_callback(GLFWwindow* window, int button, int action, int mods)
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{
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double x, y;
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if (button != GLFW_MOUSE_BUTTON_LEFT) return;
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glfwGetCursorPos(window, &x, &y);
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if (action == GLFW_PRESS) {
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double dt = glfwGetTime() - glfw.last_button_click;
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if (dt > NK_GLFW_DOUBLE_CLICK_LO && dt < NK_GLFW_DOUBLE_CLICK_HI) {
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glfw.is_double_click_down = nk_true;
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glfw.double_click_pos = nk_vec2((float)x, (float)y);
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}
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glfw.last_button_click = glfwGetTime();
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} else glfw.is_double_click_down = nk_false;
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}
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NK_INTERN void
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nk_glfw3_clipbard_paste(nk_handle usr, struct nk_text_edit *edit)
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{
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const char *text = glfwGetClipboardString(glfw.win);
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if (text) nk_textedit_paste(edit, text, nk_strlen(text));
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(void)usr;
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}
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NK_INTERN void
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nk_glfw3_clipbard_copy(nk_handle usr, const char *text, int len)
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{
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char *str = 0;
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(void)usr;
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if (!len) return;
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str = (char*)malloc((size_t)len+1);
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if (!str) return;
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NK_MEMCPY(str, text, (size_t)len);
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str[len] = '\0';
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glfwSetClipboardString(glfw.win, str);
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free(str);
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}
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NK_API struct nk_context*
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nk_glfw3_init(GLFWwindow *win, enum nk_glfw_init_state init_state)
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{
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glfw.win = win;
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if (init_state == NK_GLFW3_INSTALL_CALLBACKS) {
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glfwSetScrollCallback(win, nk_gflw3_scroll_callback);
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glfwSetCharCallback(win, nk_glfw3_char_callback);
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glfwSetMouseButtonCallback(win, nk_glfw3_mouse_button_callback);
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}
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nk_init_default(&glfw.ctx, 0);
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glfw.ctx.clip.copy = nk_glfw3_clipbard_copy;
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glfw.ctx.clip.paste = nk_glfw3_clipbard_paste;
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glfw.ctx.clip.userdata = nk_handle_ptr(0);
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nk_buffer_init_default(&glfw.ogl.cmds);
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glfw.is_double_click_down = nk_false;
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glfw.double_click_pos = nk_vec2(0, 0);
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return &glfw.ctx;
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}
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NK_API void
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nk_glfw3_font_stash_begin(struct nk_font_atlas **atlas)
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{
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nk_font_atlas_init_default(&glfw.atlas);
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nk_font_atlas_begin(&glfw.atlas);
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*atlas = &glfw.atlas;
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}
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NK_API void
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nk_glfw3_font_stash_end(void)
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{
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const void *image; int w, h;
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image = nk_font_atlas_bake(&glfw.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
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nk_glfw3_device_upload_atlas(image, w, h);
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nk_font_atlas_end(&glfw.atlas, nk_handle_id((int)glfw.ogl.font_tex), &glfw.ogl.null);
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if (glfw.atlas.default_font)
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nk_style_set_font(&glfw.ctx, &glfw.atlas.default_font->handle);
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}
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NK_API void
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nk_glfw3_new_frame(void)
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{
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int i;
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double x, y;
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struct nk_context *ctx = &glfw.ctx;
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struct GLFWwindow *win = glfw.win;
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glfwGetWindowSize(win, &glfw.width, &glfw.height);
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glfwGetFramebufferSize(win, &glfw.display_width, &glfw.display_height);
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glfw.fb_scale.x = (float)glfw.display_width/(float)glfw.width;
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glfw.fb_scale.y = (float)glfw.display_height/(float)glfw.height;
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nk_input_begin(ctx);
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for (i = 0; i < glfw.text_len; ++i)
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nk_input_unicode(ctx, glfw.text[i]);
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/* optional grabbing behavior */
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if (ctx->input.mouse.grab)
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glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
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else if (ctx->input.mouse.ungrab)
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glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
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nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_SCROLL_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_SCROLL_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_SCROLL_DOWN, glfwGetKey(win, GLFW_KEY_PAGE_DOWN) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_SCROLL_UP, glfwGetKey(win, GLFW_KEY_PAGE_UP) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_SHIFT, glfwGetKey(win, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS||
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glfwGetKey(win, GLFW_KEY_RIGHT_SHIFT) == GLFW_PRESS);
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if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS ||
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glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS) {
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nk_input_key(ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_V) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_UNDO, glfwGetKey(win, GLFW_KEY_Z) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_REDO, glfwGetKey(win, GLFW_KEY_R) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_LINE_START, glfwGetKey(win, GLFW_KEY_B) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_TEXT_LINE_END, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
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} else {
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nk_input_key(ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
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nk_input_key(ctx, NK_KEY_COPY, 0);
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nk_input_key(ctx, NK_KEY_PASTE, 0);
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nk_input_key(ctx, NK_KEY_CUT, 0);
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nk_input_key(ctx, NK_KEY_SHIFT, 0);
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}
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glfwGetCursorPos(win, &x, &y);
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nk_input_motion(ctx, (int)x, (int)y);
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if (ctx->input.mouse.grabbed) {
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glfwSetCursorPos(glfw.win, (double)ctx->input.mouse.prev.x, (double)ctx->input.mouse.prev.y);
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ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
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ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
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}
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nk_input_button(ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS);
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nk_input_button(ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS);
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nk_input_button(ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS);
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nk_input_button(ctx, NK_BUTTON_DOUBLE, (int)glfw.double_click_pos.x, (int)glfw.double_click_pos.y, glfw.is_double_click_down);
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nk_input_scroll(ctx, glfw.scroll);
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nk_input_end(&glfw.ctx);
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glfw.text_len = 0;
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glfw.scroll = nk_vec2(0,0);
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}
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NK_API
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void nk_glfw3_shutdown(void)
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{
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struct nk_glfw_device *dev = &glfw.ogl;
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nk_font_atlas_clear(&glfw.atlas);
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nk_free(&glfw.ctx);
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glDeleteTextures(1, &dev->font_tex);
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nk_buffer_free(&dev->cmds);
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NK_MEMSET(&glfw, 0, sizeof(glfw));
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}
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#endif
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