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// OpenGL glTexSubImage() test/benchmark prg (C) 2001. by A'rpi/ESP-team
#include <GL/glut.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <inttypes.h>
// pixel size: 3 or 4
#define BYTES_PP 3
// blit by lines (defined) or frames (not defined)
#define FAST_BLIT
static uint32_t image_width=720; // DVD size
static uint32_t image_height=576;
static uint32_t image_format;
static uint32_t image_bpp;
static uint32_t image_bytes;
static uint32_t texture_width=512;
static uint32_t texture_height=512;
static unsigned char *ImageData=NULL;
static GLvoid resize(int x,int y){
printf("Resize: %dx%d\n",x,y);
glViewport( 0, 0, x, y );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, image_width, image_height, 0, -1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
float akarmi=0;
int counter=0;
float gen_time=0;
float up_time=0;
float render_time=0;
unsigned char sintable[4096];
extern float GetRelativeTime();
static void redraw(void)
{
// glClear(GL_COLOR_BUFFER_BIT);
int x,y,i;
unsigned char *d=ImageData;
int dstride=BYTES_PP*image_width;
GetRelativeTime();
// generate some image:
for(y=0;y<image_height;y++){
int y1=2048*sin(akarmi*0.36725+y*0.0165);
int y2=2048*sin(akarmi*0.45621+y*0.02753);
int y3=2048*sin(akarmi*0.15643+y*0.03732);
for(x=0;x<image_width;x++){
d[0]=sintable[(y1+x*135)&4095];
d[1]=sintable[(y2+x*62)&4095];
d[2]=sintable[(y3+x*23)&4095];
d+=BYTES_PP;
}
}
gen_time+=GetRelativeTime();
#ifdef FAST_BLIT
// upload texture:
for(i=0;i<image_height;i++){
glTexSubImage2D( GL_TEXTURE_2D, // target
0, // level
0, // x offset
i, // y offset
image_width, // width
1, // height
(BYTES_PP==4)?GL_RGBA:GL_RGB, // format
GL_UNSIGNED_BYTE, // type
ImageData+i*dstride ); // *pixels
}
#else
glTexSubImage2D( GL_TEXTURE_2D, // target
0, // level
0, // x offset
0, // y offset
image_width, // width
image_height, // height
(BYTES_PP==4)?GL_RGBA:GL_RGB, // format
GL_UNSIGNED_BYTE, // type
ImageData ); // *pixels
#endif
up_time+=GetRelativeTime();
glColor3f(1,1,1);
glBegin(GL_QUADS);
glTexCoord2f(0,0);glVertex2i(0,0);
glTexCoord2f(0,1);glVertex2i(0,texture_height);
glTexCoord2f(1,1);glVertex2i(texture_width,texture_height);
glTexCoord2f(1,0);glVertex2i(texture_width,0);
glEnd();
glFinish();
glutSwapBuffers();
render_time+=GetRelativeTime();
++counter;
{ float total=gen_time+up_time+render_time;
if(total>2.0){
printf("%8.3f fps (gen: %2d%% upload: %2d%% render: %2d%%)\n",
(float)counter/total,
(int)(100.0*gen_time/total),
(int)(100.0*up_time/total),
(int)(100.0*render_time/total)
);
gen_time=up_time=render_time=0;
counter=0;
} }
}
static GLvoid IdleFunc(){
akarmi+=0.1;
glutPostRedisplay();
}
int
main(int argc, char **argv)
{
int i;
glutInit(&argc, argv);
glutInitWindowSize(640, 480);
glutInitDisplayMode(GLUT_DOUBLE);
(void) glutCreateWindow("csg");
glutDisplayFunc(redraw);
glutReshapeFunc(resize);
glutIdleFunc(IdleFunc);
texture_width=32;
while(texture_width<image_width) texture_width*=2;
while(texture_width<image_height) texture_width*=2;
texture_height=texture_width;
image_bpp=8*BYTES_PP;
image_bytes=BYTES_PP;
ImageData=malloc(texture_width*texture_height*image_bytes);
memset(ImageData,128,texture_width*texture_height*image_bytes);
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
glDisable(GL_CULL_FACE);
glEnable(GL_TEXTURE_2D);
printf("Creating %dx%d texture...\n",texture_width,texture_height);
#if 1
// glBindTexture(GL_TEXTURE_2D, texture_id);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
#ifdef TEXTUREFORMAT_32BPP
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, texture_width, texture_height, 0,
#else
glTexImage2D(GL_TEXTURE_2D, 0, BYTES_PP, texture_width, texture_height, 0,
#endif
(image_bytes==4)?GL_RGBA:GL_BGR, GL_UNSIGNED_BYTE, ImageData);
#endif
resize(640,480);
glClearColor( 1.0f,0.0f,1.0f,0.0f );
glClear( GL_COLOR_BUFFER_BIT );
for(i=0;i<4096;i++) sintable[i]=128+127*sin(2.0*3.14159265*i/4096.0);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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