+/* gltest - small OpenGL tearing test program
+ * Copyright (C) 2012-2013 Ralf Jung <post@ralfj.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
// stdlib includes
#include <time.h>
#include <stdio.h>
#include "glwindow.h"
#if defined(USE_GLX)
#include "glxbackend.h"
-GLBackend *createGLBackend()
+static GLBackend *createGLBackend()
{
return new GLXBackend();
}
#elif defined(USE_EGL)
#include "eglbackend.h"
-GLBackend *createGLBackend()
+static GLBackend *createGLBackend()
{
return new EGLBackend();
}
#endif
// configuration
-const GLfloat boxWidth = 0.045f;
-const GLfloat boxSpeed = 1.25f; // per second
+static const GLfloat boxWidth = 0.045f;
+static const GLfloat boxSpeed = 1.25f; // per second
// profiler
-const int numProfilerStates = 5;
-const char *profilerStateNames[numProfilerStates] = { "Pre-Render", "Drawing", "Swapping", "Post-Render", "Outside renderer"};
+enum ProfilerState { StatePreRender, StateClear, StateDraw, StatePresent, StatePostRender, StateOutsideRender, NumProfilerStates };
+static const char *profilerStateNames[NumProfilerStates] = { "Pre-Render", "Clearing", "Drawing", "Presenting", "Post-Render", "Outside renderer"};
// utility functions
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 rectQuad(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() : GLWindow(XOpenDisplay(0), createGLBackend()), 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) {
// initailize profiler
framect = 0;
memset(stateTime, 0, sizeof(stateTime));
- curState = -1;
+ curState = NumProfilerStates;
lastDisplay = lastProfile = getTime();
}
virtual void resizeGL(unsigned int width, unsigned int height)
{
- /* prevent divide-by-zero */
- if (height == 0)
- height = 1;
+ // prevent divide-by-zero
+ if (height == 0)
+ height = 1;
glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
glOrtho (0, 1, 1, 0, 0, 1);
- glMatrixMode(GL_MODELVIEW);
- glClear(GL_COLOR_BUFFER_BIT);
+ glMatrixMode(GL_MODELVIEW);
+ glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+ glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}
- void profilerTick(int nextState)
+ void profilerTick(ProfilerState nextState)
{
- assert (nextState >= 0 && nextState < numProfilerStates);
+ assert (nextState >= 0 && nextState < NumProfilerStates);
double time = getTime();
- if (curState >= 0)
+ if (curState >= 0 && curState < NumProfilerStates)
stateTime[curState] += time-lastProfile;
curState = nextState;
lastProfile = time;
const double elapsed = time-lastDisplay;
if (elapsed >= 3) {
printf("%.1f fps, time spent: ", framect/elapsed);
- for (int i = 0; i < numProfilerStates; ++i) {
+ for (int i = 0; i < NumProfilerStates; ++i) {
if (i != 0) printf(", ");
printf("%s %.1f%%", profilerStateNames[i], stateTime[i]/elapsed*100);
}
}
void renderGL()
- {
- profilerTick(0);
+ {
+ //////////////////////////////////////////////
+ profilerTick(StatePreRender);
double time = getTime();
// anim
double passedTime = time-lastFrame;
}
}
lastFrame = time;
- // draw
- //glFlush();
- profilerTick(1);
- //glClear(GL_COLOR_BUFFER_BIT);
+ //////////////////////////////////////////////
+ profilerTick(StateClear);
+ if (overdraw) {
+ // clear manually
+ glBegin(GL_QUADS);
+ glColor3f(0.0f, 0.0f, 0.0f);
+ rectQuad(0, 0, 1, 1);
+ glEnd();
+ }
+ else {
+ glClear(GL_COLOR_BUFFER_BIT);
+ }
+ //////////////////////////////////////////////
+ profilerTick(StateDraw);
glBegin(GL_QUADS);
- // clear manually
- glColor3f(0.0f, 0.0f, 0.0f);
- drawRect(0, 0, 1, 1);
glColor3f(0.8f, 1.0f, 0.75f);
- drawRect(boxPos, 0, boxPos+boxWidth, 1);
+ rectQuad(boxPos, 0, boxPos+boxWidth, 1);
glEnd();
- usleep(20*1000);
- profilerTick(2);
- getBackend()->swapBuffers();
-// glDrawBuffer(GL_FRONT);
-// int xpos = 0;
-// int ypos = 0;
- //foreach (const QRect &r, region.rects()) {
- // convert to OpenGL coordinates
- //int y = displayHeight() - 0 - r.height();
-// glBitmap(0, 0, 0, 0, 0 - xpos, 0 - ypos, NULL); // not glRasterPos2f, see glxbackend.cpp
-// xpos = 0;
-// ypos = 0;
-// glCopyPixels(0, 0, getWidth(), getHeight(), GL_COLOR);
- //}
-// glBitmap(0, 0, 0, 0, -xpos, -ypos, NULL); // move position back to 0,0
-// glDrawBuffer(GL_BACK);
- profilerTick(3);
+ usleep(sleep_time*1000);
+ //////////////////////////////////////////////
+ profilerTick(StatePresent);
+ if (copy) {
+ glDrawBuffer(GL_FRONT);
+ glCopyPixels(0, 0, getWidth(), getHeight(), GL_COLOR);
+ glDrawBuffer(GL_BACK);
+ }
+ else {
+ getBackend()->swapBuffers();
+ }
+ //////////////////////////////////////////////
+ profilerTick(StatePostRender);
glFlush();
++framect;
- profilerTick(4);
+ //////////////////////////////////////////////
+ profilerTick(StateOutsideRender);
}
virtual void handleKeyPress(KeySym key)
}
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];
+ int framect;
+ ProfilerState curState;
+ double stateTime[NumProfilerStates];
};
-
-
int main(int argc, char ** argv)
{
// program options handling
desc.add_options()
("help,h", "produce help message")
("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);
}
// actual program
- TearTestWindow w;
+ 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>());
projects / gltest.git / blobdiff