From patchwork Fri Aug 24 14:21:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yordan Karadzhov X-Patchwork-Id: 10759149 Return-Path: Received: from mail-wm0-f65.google.com ([74.125.82.65]:55248 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726360AbeHXR4i (ORCPT ); Fri, 24 Aug 2018 13:56:38 -0400 Received: by mail-wm0-f65.google.com with SMTP id c14-v6so1765422wmb.4 for ; Fri, 24 Aug 2018 07:21:44 -0700 (PDT) From: "Yordan Karadzhov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org, "Yordan Karadzhov (VMware)" Subject: [PATCH v2 2/4] kernel-shark-qt: Add basic instruments for OpenGL plotting. Date: Fri, 24 Aug 2018 17:21:14 +0300 Message-Id: <20180824142116.21339-3-y.karadz@gmail.com> In-Reply-To: <20180824142116.21339-1-y.karadz@gmail.com> References: <20180824142116.21339-1-y.karadz@gmail.com> Sender: linux-trace-devel-owner@vger.kernel.org List-ID: Content-Length: 8607 This patch introduces tools for initializing OpenGL and for drawing the three basic geometrical primitives (point, line and polygon) used when plotting KernelShark's graphs. Signed-off-by: Yordan Karadzhov (VMware) --- kernel-shark-qt/src/CMakeLists.txt | 13 ++ kernel-shark-qt/src/libkshark-plot.c | 212 +++++++++++++++++++++++++++ kernel-shark-qt/src/libkshark-plot.h | 69 +++++++++ 3 files changed, 294 insertions(+) create mode 100644 kernel-shark-qt/src/libkshark-plot.c create mode 100644 kernel-shark-qt/src/libkshark-plot.h diff --git a/kernel-shark-qt/src/CMakeLists.txt b/kernel-shark-qt/src/CMakeLists.txt index a762da1..9c74bc0 100644 --- a/kernel-shark-qt/src/CMakeLists.txt +++ b/kernel-shark-qt/src/CMakeLists.txt @@ -13,5 +13,18 @@ target_link_libraries(kshark ${CMAKE_DL_LIBS} set_target_properties(kshark PROPERTIES SUFFIX ".so.${KS_VERSION_STRING}") +if (OPENGL_FOUND AND GLUT_FOUND) + + message(STATUS "libkshark-plot") + add_library(kshark-plot SHARED libkshark-plot.c) + + target_link_libraries(kshark-plot kshark + ${OPENGL_LIBRARIES} + ${GLUT_LIBRARY}) + + set_target_properties(kshark-plot PROPERTIES SUFFIX ".so.${KS_VERSION_STRING}") + +endif (OPENGL_FOUND AND GLUT_FOUND) + configure_file( ${KS_DIR}/build/deff.h.cmake ${KS_DIR}/src/KsDeff.h) diff --git a/kernel-shark-qt/src/libkshark-plot.c b/kernel-shark-qt/src/libkshark-plot.c new file mode 100644 index 0000000..17d3b90 --- /dev/null +++ b/kernel-shark-qt/src/libkshark-plot.c @@ -0,0 +1,212 @@ +/* SPDX-License-Identifier: LGPL-2.1 */ + +/* + * Copyright (C) 2018 VMware Inc, Yordan Karadzhov + */ + + /** + * @file libkshark-plot.c + * @brief Basic tools for OpenGL plotting. + */ + +// OpenGL +#include +#include + +// KernelShark +#include "libkshark-plot.h" + +/** + * @brief Create an empty scene for drawing. + * + * @param width: Width of the screen window in pixels. + * @param height: Height of the screen window in pixels. + */ +void ksplot_make_scene(int width, int height) +{ + /* Set Display mode. */ + glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); + + /* Prevent the program from exiting when a window is closed. */ + glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, + GLUT_ACTION_GLUTMAINLOOP_RETURNS); + + /* Set window size. */ + glutInitWindowSize(width, height); + + /* Set window position on screen. */ + glutInitWindowPosition(50, 50); + + /* Open the screen window. */ + glutCreateWindow("KernelShark Plot"); + + /* + * Set the origin of the coordinate system to be the top left corner. + * The "Y" coordinate is inverted. + */ + gluOrtho2D(0, width, height, 0); + glViewport(0, 0, width, height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); +} + +/** + * @brief Initialize OpenGL. + * + * @param dpr: Device Pixel Ratio. + */ +void ksplot_init_opengl(int dpr) +{ + glDisable(GL_TEXTURE_2D); + glDisable(GL_DEPTH_TEST); + glDisable(GL_COLOR_MATERIAL); + glEnable(GL_BLEND); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glEnable(GL_POLYGON_SMOOTH); + glLineWidth(1.5 * dpr); + glPointSize(2.5 * dpr); + glClearColor(1, 1, 1, 1); +} + +/** + * @brief To be called whenever the OpenGL window has been resized. + * + * @param width: Width of the screen window in pixels. + * @param height: Height of the screen window in pixels. + */ +void ksplot_resize_opengl(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + + /* + * Set the origin of the coordinate system to be the top left corner. + * The "Y" coordinate is inverted. + */ + gluOrtho2D(0, width, height, 0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +/** + * @brief Draw a point. + * + * @param p: Input location for the point object. + * @param col: The color of the point. + * @param size: The size of the point. + */ +void ksplot_draw_point(const struct ksplot_point *p, + const struct ksplot_color *col, + float size) +{ + if (!p || !col || size < .5f) + return; + + glPointSize(size); + glBegin(GL_POINTS); + glColor3ub(col->red, col->green, col->blue); + glVertex2i(p->x, p->y); + glEnd(); +} + +/** + * @brief Draw a line. + * + * @param a: Input location for the first finishing point of the line. + * @param b: Input location for the second finishing point of the line. + * @param col: The color of the line. + * @param size: The size of the line. + */ +void ksplot_draw_line(const struct ksplot_point *a, + const struct ksplot_point *b, + const struct ksplot_color *col, + float size) +{ + if (!a || !b || !col || size < .5f) + return; + + glLineWidth(size); + glBegin(GL_LINES); + glColor3ub(col->red, col->green, col->blue); + glVertex2i(a->x, a->y); + glVertex2i(b->x, b->y); + glEnd(); +} + +/** + * @brief Draw a polygon. + * + * @param points: Input location for the array of points defining the polygon. + * @param n_points: The size of the array of points. + * @param col: The color of the polygon. + * @param size: The size of the polygon. + */ +void ksplot_draw_polygon(const struct ksplot_point *points, + size_t n_points, + const struct ksplot_color *col, + float size) +{ + if (!points || !n_points || !col || size < .5f) + return; + + if (n_points == 1) { + ksplot_draw_point(points, col, size); + return; + } + + if (n_points == 2) { + ksplot_draw_line(points, points + 1, col, size); + return; + } + + /* Obtain a point inside the surface of the polygon. */ + struct ksplot_point in_point; + in_point.x = (points[0].x + points[2].x) / 2; + in_point.y = (points[0].y + points[2].y) / 2; + + /* + * Draw a Triangle Fan using the internal point as a central + * vertex. + */ + glBegin(GL_TRIANGLE_FAN); + glColor3ub(col->red, col->green, col->blue); + glVertex2i(in_point.x, in_point.y); + for (size_t i = 0; i < n_points; ++i) + glVertex2i(points[i].x, points[i].y); + + glVertex2i(points[0].x, points[0].y); + glEnd(); +} + +/** + * @brief Draw the contour of a polygon. + * + * @param points: Input location for the array of points defining the polygon. + * @param n_points: The size of the array of points. + * @param col: The color of the polygon. + * @param size: The size of the polygon. + */ +void ksplot_draw_polygon_contour(const struct ksplot_point *points, + size_t n_points, + const struct ksplot_color *col, + float size) +{ + if (!points || !n_points || !col || size < .5f) + return; + + /* Loop over the points of the polygon and draw connecting lines. */ + for(size_t i = 1; i < n_points; ++i) + ksplot_draw_line(&points[i - 1], + &points[i], + col, + size); + + /* Close the contour. */ + ksplot_draw_line(&points[0], + &points[n_points - 1], + col, + size); +} diff --git a/kernel-shark-qt/src/libkshark-plot.h b/kernel-shark-qt/src/libkshark-plot.h new file mode 100644 index 0000000..9a4dbc0 --- /dev/null +++ b/kernel-shark-qt/src/libkshark-plot.h @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: LGPL-2.1 */ + +/* + * Copyright (C) 2018 VMware Inc, Yordan Karadzhov + */ + + /** + * @file libkshark-plot.h + * @brief Basic tools for OpenGL plotting. + */ + +#ifndef _LIB_KSHARK_PLOT_H +#define _LIB_KSHARK_PLOT_H + +#ifdef __cplusplus +extern "C" { +#endif + +/** Structure defining a RGB color. */ +struct ksplot_color { + /** The Red component of the color. */ + uint8_t red; + + /** The Green component of the color. */ + uint8_t green; + + /** The Blue component of the color. */ + uint8_t blue; +}; + +/** Structure defining a 2D point. */ +struct ksplot_point { + /** The horizontal coordinate of the point in pixels. */ + int x; + + /** The vertical coordinate of the pointin in pixels. */ + int y; +}; + +void ksplot_make_scene(int width, int height); + +void ksplot_init_opengl(int dpr); + +void ksplot_resize_opengl(int width, int height); + +void ksplot_draw_point(const struct ksplot_point *p, + const struct ksplot_color *col, + float size); + +void ksplot_draw_line(const struct ksplot_point *a, + const struct ksplot_point *b, + const struct ksplot_color *col, + float size); + +void ksplot_draw_polygon(const struct ksplot_point *points, + size_t n_points, + const struct ksplot_color *col, + float size); + +void ksplot_draw_polygon_contour(const struct ksplot_point *points, + size_t n_points, + const struct ksplot_color *col, + float size); + +#ifdef __cplusplus +} +#endif + +#endif