int
openexr_dd_open(const char *name, int width, int height,
int bits, RtToken component, const char *format)
{
#if HAVE_OPENEXR
int i;
ImfHeader *header;
(void)bits;
if (strcmp(format, "float") != 0 ) {
ri_log(LOG_ERROR, "currently openexr output supports float format");
return 0;
}
if (strcmp(component, RI_RGB) != 0) {
ri_log(LOG_WARN, "currently only supports rgb component");
}
header = ImfNewHeader();
ImfHeaderSetDisplayWindow(header, 0, 0, width - 1 , height - 1);
ImfHeaderSetDataWindow(header, 0, 0, width - 1, height - 1);
ImfHeaderSetScreenWindowWidth(header, width);
ImfHeaderSetStringAttribute(header, "owner", "lucille");
gfp = ImfOpenOutputFile(name, header, IMF_WRITE_RGBA);
if (!gfp) {
printf("[error] Can't open file [ %s ] for save.\n", name);
return 0;
}
ImfDeleteHeader(header);
gbuf = (ImfRgba *)ri_mem_alloc(width * height * sizeof(ImfRgba));
for (i = 0; i < width * height; i++) {
ImfFloatToHalf(0.0f, &gbuf[i].r);
ImfFloatToHalf(0.0f, &gbuf[i].g);
ImfFloatToHalf(0.0f, &gbuf[i].b);
ImfFloatToHalf(1.0f, &gbuf[i].a);
}
ImfOutputSetFrameBuffer(gfp,
gbuf, /* pointer to pixels */
1, /* xstride */
width); /* ystride */
gwidth = width;
gheight = height;
#endif
return 1;
}
int main()
{
const char *software = "microexr";
const char *comment = "a simple test case for the microexr library";
ImfHeader *header = ImfNewHeader();
ImfHeaderSetType(header, IMF_DEEPSCANLINE);
ImfHeaderSetCompression(header, IMF_ZIPS_COMPRESSION );
ImfHeaderSetStringAttribute( header, "software", software );
ImfHeaderSetStringAttribute( header, "comment", comment );
ImfHeaderSetDataWindow( header, 0, 0, XRES-1, YRES-1 );
ImfHeaderSetDisplayWindow( header, 0, 0, XRES-1, YRES-1 );
ImfHeaderSetPixelAspectRatio( header, 1.0f );
ImfHeaderSetScreenWindowCenter(header, 0.0, 0.0);
ImfHeaderSetScreenWindowWidth(header, 1.0);
ImfHeaderSetLineOrder( header, IMF_INCREASING_Y );
ImfOutputFile *exr =
ImfOpenOutputFile( "deepgradient.exr", header, IMF_WRITE_RGBAZZB );
if( !exr )
{
perror( "gradient: unable to open 'gradient.exr' for writing" );
exit( 1 );
}
/* Write a simple gradient in a framebuffer. */
void **fb = new void*[XRES*6];
/* Fast access to half and float samples of the framebuffer */
ImfHalf **half_fb = (ImfHalf **)fb;
float **float_fb = (float **)fb;
unsigned int *samples = new unsigned int[XRES];
for(unsigned i=0; i<XRES; i++)
{
samples[i]=1;
fb[i*6 + 0] = new ImfHalf[samples[i]];
fb[i*6 + 1] = new ImfHalf[samples[i]];
fb[i*6 + 2] = new ImfHalf[samples[i]];
fb[i*6 + 3] = new ImfHalf[samples[i]];
fb[i*6 + 4] = new float[samples[i]];
fb[i*6 + 5] = new float[samples[i]];
}
for( unsigned j=0; j<YRES; j++ )
{
float g = float(j) / float(YRES-1);
assert( g<=1.0f );
for( unsigned i=0; i<XRES; i++ )
{
float r = float(i) / float(XRES-1);
for(unsigned s=0; s<samples[i]; s++)
{
ImfFloatToHalf( r, half_fb[i*6 + 0]+s );
ImfFloatToHalf( g, half_fb[i*6 + 1]+s );
ImfFloatToHalf(0.5f, half_fb[i*6 + 2]+s );
ImfFloatToHalf(0.9f, half_fb[i*6 + 3]+s );
float z = (g-0.5)*(g-0.5) + (r-0.5)*(r-0.5);
z = 10*sqrt(z);
z = 10-z;
float_fb[i*6 + 4][s] = z;
float_fb[i*6 + 5][s] = z+0.01;
}
}
ImfOutputSetDeepFrameBuffer(
exr, samples, (const char **)fb, 6*sizeof(fb), 0, sizeof(fb) );
ImfOutputWritePixels( exr, 1 );
}
ImfCloseOutputFile( exr );
ImfDeleteHeader( header );
delete [] samples;
for(unsigned i=0; i<XRES; i++)
{
delete half_fb[i*6 + 0];
delete half_fb[i*6 + 1];
delete half_fb[i*6 + 2];
delete half_fb[i*6 + 3];
delete float_fb[i*6 + 4];
delete float_fb[i*6 + 5];
}
delete [] fb;
exit( 0 );
}
