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372 lines
13 KiB
372 lines
13 KiB
/* |
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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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} 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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nk_input_button(&glfw.ctx, NK_BUTTON_DOUBLE, (int)x, (int)y, nk_true); |
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glfw.last_button_click = glfwGetTime(); |
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} else nk_input_button(&glfw.ctx, NK_BUTTON_DOUBLE, (int)x, (int)y, 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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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, ctx->input.mouse.prev.x, 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_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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