I wrote simple program to test TCL and NO-TCL on my r200 and DRI CVS.
It draws board with BoardSize*BoardSize textured tiles.
framerates:
TCL NO-TCL
#define Far 1000.0 137 160
#define BoardSize 100.0
#define Far 1000.0 44 51
#define BoardSize 200.0
#define Far 100.0 44 79
#define BoardSize 200.0
#define Far 50.0 44 85
#define BoardSize 200.0
#define Far 50.0 20 40
#define BoardSize 300.0
Looks like TCL driver calculates things even, when they should be clipped out.
Maybe that's the reason for worse performance in TCL mode?
And now fun with textures:
max texture size:2048
#define TextureSize 1024 - texture is visible
#define TextureSize 2048 - texture is sometimes visible, sometimes not
(single color)
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#include <GL/gl.h>
#include <GL/glu.h>
#include <SDL.h>
#include <cmath>
#include <iostream>
#define ScreenX 800
#define ScreenY 600
#define ScreenBPP 24
#define ViewAngle 45.0
#define Near 0.1
#define Height -15.0
#define Distance -40.0
#define TextureSize 1024
#define Far 1000.0
#define BoardSize 100.0
int main()
{
GLfloat *picture;
int i,j,k;
GLfloat color[4];
GLuint id; // texture
int t,t0; // times
int fps;
int max;
SDL_SetVideoMode (ScreenX, ScreenY, ScreenBPP, SDL_OPENGL);
glViewport (0, 0, ScreenX, ScreenY);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective(ViewAngle,(float)ScreenX/ScreenY,Near,Far);
glMatrixMode (GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&max);
cout <<"max texture size:"<<max<<"\n";
picture=new GLfloat[4*TextureSize*TextureSize];
for (i=0;i<TextureSize;i++)
for (j=0;j<TextureSize;j++)
{
color[0]=(float)i/TextureSize;
color[1]=(float)j/TextureSize;
color[2]=0;
color[3]=1.0;
for (k=0;k<4;k++)
picture[(TextureSize*j+i)*4+k]=color[k];
}
glGenTextures(1,&id);
glBindTexture(GL_TEXTURE_2D,id);
gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGBA,TextureSize,TextureSize,GL_RGBA,GL_FLOAT,picture);
delete [] picture;
fps=0;
t0=SDL_GetTicks();
do
{
SDL_PumpEvents();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-BoardSize/2,Height,Distance-BoardSize);
glBegin(GL_QUADS);
for (i=0;i<BoardSize;i++)
for (j=0;j<BoardSize;j++)
{
glTexCoord2f(0,0);
glVertex3f(i,0,j);
glTexCoord2f(1,0);
glVertex3f(i+1,0,j);
glTexCoord2f(1,1);
glVertex3f(i+1,0,j+1);
glTexCoord2f(0,1);
glVertex3f(i,0,j+1);
}
glEnd();
SDL_GL_SwapBuffers();
fps++;
t=SDL_GetTicks();
if (t>t0+1000)
{
t0+=1000;
cout <<"fps="<<fps<<"\n";
fps=0;
}
}
while (SDL_GetKeyState(NULL)[SDLK_ESCAPE]!=SDL_PRESSED);
}
big_textures: big_textures.cc
g++ -o big_textures big_textures.cc `sdl-config --cflags --libs` -lm -lGL
-lGLU
