Sorry for lack of response. Illness and loss of internet connection. This
conversation is modem powered.
As I mentioned a little while ago, I wanted to benchmark the speed at
which an OpenGL rendering into a buffer can be moved out of video memory,
into the system memory and then back into an Evas Image and rendered to
the screen.
Would anybody be surprised if I said that it really isn't fast... ahem.
Just had to try. Pseudo code of a main loop:
1) Render frame to a PBuffer
2) Get the data using glReadPixels
3) Put the frame back into an image using evas_object_image_data_set
Compile as a C++ program:
gcc bench_gl_evas.cpp -o bench_gl_evas `ecore-config --libs --cflags`
`evas-config --libs --cflags` -lGL -lGLU -lstdc++
Regards Rene Jensen
------ bench_gl_evas.cpp -----------------------
#include <iostream>
#include <fstream>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <Evas.h>
static const int PBUFFER_WIDTH = 512;
static const int PBUFFER_HEIGHT = 512;
struct Vertex
{
float tu, tv;
float x, y, z;
};
Vertex g_cubeVertices[] =
{
{ 0.0f,0.0f, -1.0f,-1.0f, 1.0f },
{ 1.0f,0.0f, 1.0f,-1.0f, 1.0f },
{ 1.0f,1.0f, 1.0f, 1.0f, 1.0f },
{ 0.0f,1.0f, -1.0f, 1.0f, 1.0f },
{ 1.0f,0.0f, -1.0f,-1.0f,-1.0f },
{ 1.0f,1.0f, -1.0f, 1.0f,-1.0f },
{ 0.0f,1.0f, 1.0f, 1.0f,-1.0f },
{ 0.0f,0.0f, 1.0f,-1.0f,-1.0f },
{ 0.0f,1.0f, -1.0f, 1.0f,-1.0f },
{ 0.0f,0.0f, -1.0f, 1.0f, 1.0f },
{ 1.0f,0.0f, 1.0f, 1.0f, 1.0f },
{ 1.0f,1.0f, 1.0f, 1.0f,-1.0f },
{ 1.0f,1.0f, -1.0f,-1.0f,-1.0f },
{ 0.0f,1.0f, 1.0f,-1.0f,-1.0f },
{ 0.0f,0.0f, 1.0f,-1.0f, 1.0f },
{ 1.0f,0.0f, -1.0f,-1.0f, 1.0f },
{ 1.0f,0.0f, 1.0f,-1.0f,-1.0f },
{ 1.0f,1.0f, 1.0f, 1.0f,-1.0f },
{ 0.0f,1.0f, 1.0f, 1.0f, 1.0f },
{ 0.0f,0.0f, 1.0f,-1.0f, 1.0f },
{ 0.0f,0.0f, -1.0f,-1.0f,-1.0f },
{ 1.0f,0.0f, -1.0f,-1.0f, 1.0f },
{ 1.0f,1.0f, -1.0f, 1.0f, 1.0f },
{ 0.0f,1.0f, -1.0f, 1.0f,-1.0f }
};
// This class is simply a fancy way of rendering a scene and getting it
// as an ARGB array of integers
//
class RenderNode
{
public:
unsigned long* data;
Display* display;
GLXPbuffer pbuffer;
GLXContext pbufferContext;
void init ()
{
// Open the X display
display = XOpenDisplay(0);
if (! display)
throw "Can't open X display";
int nItems;
int attrib[] =
{
GLX_DOUBLEBUFFER, False,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DEPTH_SIZE, 1,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT | GLX_WINDOW_BIT,
None
};
int pbufAttrib[] =
{
GLX_PBUFFER_WIDTH, PBUFFER_WIDTH,
GLX_PBUFFER_HEIGHT, PBUFFER_HEIGHT,
GLX_LARGEST_PBUFFER, False,
None
};
GLXFBConfig *fbconfig = glXChooseFBConfig (
display, DefaultScreen(display),
attrib, &nItems);
if (fbconfig == 0)
throw "Can't choose fbconfig";
pbuffer = glXCreatePbuffer (
display, fbconfig[0], pbufAttrib);
XVisualInfo* visinfo = glXGetVisualFromFBConfig(
display, fbconfig[0] );
if (! visinfo)
throw "Error: init - Couldn't get wanted visual";
pbufferContext = glXCreateNewContext(display, fbconfig[0],
GLX_RGBA_TYPE, NULL, GL_TRUE);
if (! pbufferContext)
throw "Can't make pbuffer context";
XFree( fbconfig );
XFree( visinfo );
data = new unsigned long[PBUFFER_WIDTH*PBUFFER_HEIGHT];
}
void render ()
{
if (! glXMakeContextCurrent(
display, pbuffer, pbuffer, pbufferContext))
throw "Can't make context current";
static float time = 20.0;
time += 0.1;
glClearColor( 0,0,0, 1.0f );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 45.0f,
PBUFFER_WIDTH / PBUFFER_HEIGHT, 0.1f, 10.0f );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0f, 0.0f, -5.0f );
glRotatef( time, 1.0f, 0.0f, 0.0f );
glRotatef( time, 0.0f, 1.0f, 0.0f );
glInterleavedArrays( GL_T2F_V3F, 0, g_cubeVertices );
glDrawArrays( GL_QUADS, 0, 24 );
glFlush();
glReadPixels (0,0, PBUFFER_WIDTH, PBUFFER_HEIGHT,
GL_BGRA, GL_UNSIGNED_BYTE, data);
}
};
Ecore_Evas *ee;
Evas *evas;
Evas_Object *bg;
RenderNode* renderNode;
// This timer callback will transfer the data in the renderNode to
// an image and then refresh the Evas to make the changed image visible.
int timer_cb (void *data)
{
renderNode->render();
evas_object_image_data_set (
(Evas_Object*)bg, renderNode->data);
evas_object_image_data_update_add (bg, 0,0,
PBUFFER_WIDTH, PBUFFER_HEIGHT);
return 1;
}
int main(int argc, const char** argv)
{
renderNode = new RenderNode();
renderNode->init();
ecore_init();
ecore_app_args_set(argc, argv);
if (!ecore_evas_init()) return -1;
ee = ecore_evas_software_x11_new(NULL, 0, 0, 0,
PBUFFER_WIDTH, PBUFFER_HEIGHT);
if (!ee) return -1;
ecore_evas_title_set(ee, "EE Test");
ecore_evas_show(ee);
evas = ecore_evas_get(ee);
bg = evas_object_image_add(evas);
evas_object_image_size_set (bg, PBUFFER_WIDTH,PBUFFER_HEIGHT);
evas_object_move(bg, 0, 0);
evas_object_resize(bg, PBUFFER_WIDTH, PBUFFER_HEIGHT);
evas_object_layer_set(bg, 0);
evas_object_color_set(bg, 255, 255, 220, 255);
evas_object_show(bg);
evas_object_image_data_set (bg, renderNode->data);
evas_object_image_size_set (bg, PBUFFER_WIDTH,PBUFFER_HEIGHT);
evas_object_image_fill_set (bg, 0,0,PBUFFER_WIDTH, PBUFFER_HEIGHT);
ecore_timer_add(0.01, timer_cb, bg);
ecore_main_loop_begin();
//while (true)
//{
//ecore_main_loop_iterate();
//renderNode->render();
//evas_object_image_data_set (bg, renderNode->data);
//evas_object_image_data_update_add (
// bg, 0,0,PBUFFER_WIDTH, PBUFFER_HEIGHT);
//}
return 0;
}
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