add option to slep some time during each frame

diff --git a/gltest.cpp b/gltest.cpp
index ff413afbd20a5c9665400f8ba12806d20b94d0b7..fbe79a852a9611318cbee4ccb0d533400a66e4dd 100644 (file)
--- a/gltest.cpp
+++ b/gltest.cpp
@@ -45,15 +45,19 @@ static double getTime()
        return tp.tv_sec + 1e-9 * tp.tv_nsec;
 }
 
-static void drawRect(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
+static void rectVertices(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2)
 {
-       glVertex2f(x1, y1); glVertex2f(x2, y1); glVertex2f(x2, y2); glVertex2f(x1, y2);
+       glVertex2f(x1, y1);
+       glVertex2f(x2, y1);
+       glVertex2f(x2, y2);
+       glVertex2f(x1, y2);
 }
 
 // the window
 class TearTestWindow : public GLWindow {
 public:
-       TearTestWindow(bool overdraw, bool copy) : GLWindow(XOpenDisplay(0), createGLBackend()), overdraw(overdraw), copy(copy), boxPos(0), boxDirection(1)
+       TearTestWindow(bool overdraw, bool copy, int sleep_time) : GLWindow(XOpenDisplay(0), createGLBackend()),
+               overdraw(overdraw), copy(copy), sleep_time(sleep_time), boxPos(0), boxDirection(1)
        {}
 
        void setSwapInterval(int i) {
@@ -137,7 +141,7 @@ protected:
                        // clear manually
                        glBegin(GL_QUADS);
                        glColor3f(0.0f, 0.0f, 0.0f);
-                       drawRect(0, 0, 1, 1);
+                       rectVertices(0, 0, 1, 1);
                        glEnd();
                }
                else {
@@ -147,8 +151,9 @@ protected:
                profilerTick(stateDraw);
                glBegin(GL_QUADS);
                glColor3f(0.8f, 1.0f, 0.75f);
-               drawRect(boxPos, 0, boxPos+boxWidth, 1);
+               rectVertices(boxPos, 0, boxPos+boxWidth, 1);
                glEnd();
+               usleep(sleep_time*1000);
                //////////////////////////////////////////////
                profilerTick(statePresent);
                if (copy) {
@@ -178,9 +183,11 @@ protected:
 
 private:
        bool overdraw, copy;
+       int sleep_time;
+       // animation control
        double lastFrame;
        GLfloat boxPos, boxDirection;
-       // FPS
+       // FPS, profiler
        double lastDisplay, lastProfile;                 
        int framect, curState;
        double stateTime[numProfilerStates];
@@ -195,6 +202,7 @@ int main(int argc, char ** argv)
                ("swap-interval,i", po::value<int>(), "set swap interval")
                ("copy,c", "copy to front buffer (instead of performing a buffer swap)")
                ("overdraw,o", "overdraw previous image (instead of calling glClear)")
+               ("sleep,s", po::value<int>()->default_value(0), "Number of milliseconds to sleap in each frame (in the drawing phase)")
        ;
        po::variables_map vm;
        po::store(po::parse_command_line(argc, argv, desc), vm);
@@ -206,7 +214,7 @@ int main(int argc, char ** argv)
        }
 
        // actual program
-       TearTestWindow w(vm.count("overdraw"), vm.count("copy"));
+       TearTestWindow w(vm.count("overdraw"), vm.count("copy"), vm["sleep"].as<int>());
        w.open(800, 600);
        if (vm.count("swap-interval"))
                w.setSwapInterval(vm["swap-interval"].as<int>());