bool next_frame()
{
png_structp png_ptr;
png_infop info_ptr;
struct archive_entry *ae;
int res;
read_data:
res = archive_read_next_header(this->archive, &ae);
if (res != ARCHIVE_OK || res == ARCHIVE_EOF) {
if (play_mode == LOOP) {
/* Go to the first archive entry and read it. */
close();
open();
goto read_data;
} else {
printf("Animation finished.\n");
return false;
}
} else if (res == ARCHIVE_FATAL || res == ARCHIVE_WARN || res == ARCHIVE_RETRY) {
printf("Failed to read next header.\n");
return false;
} else if (res == 0) {
/* At the end of the archive check the loop flag to see if we
* restart. */
if (read_png(&png_ptr, &info_ptr, this->archive) == 1) {
fprintf(stderr, "Problem reading PNG.\n");
return false;
}
/* Store the image data into the framebuffer. */
set_framebuffer(png_ptr, info_ptr, framebuffer);
png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
} else {
fprintf(stderr, "archive_read_next_header resulted in an unknown error.\n");
return false;
}
return true;
}
~preserve_fbo() { set_framebuffer(o,v); }
bool fbo::setup( GLint color_format, GLint depth_format, GLsizei w, GLsizei h)
{
ready = false;
_w = w, _h = h;
GLint o[1], v[4];
get_framebuffer(o, v);
$glGenFramebuffersEXT(1, &frame);
$glGenTextures (1, &color);
$glGenTextures (1, &depth);
// Initialize the color render buffer object.
$glBindTexture(GL_TEXTURE_2D, color);
$glTexImage2D (GL_TEXTURE_2D, 0, color_format, w, h, 0,GL_RGBA, GL_INT, NULL);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Initialize the depth render buffer object.
$glBindTexture(GL_TEXTURE_2D, depth);
$glTexImage2D (GL_TEXTURE_2D, 0, depth_format, w, h, 0,GL_DEPTH_COMPONENT, GL_INT, NULL);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
$glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
// Initialize the frame buffer object.
$glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, frame);
$glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_2D, color, 0);
$glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_DEPTH_ATTACHMENT_EXT,GL_TEXTURE_2D, depth, 0);
// Confirm the frame buffer object status.
auto result = glCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
;
switch( result )
{
case GL_FRAMEBUFFER_COMPLETE_EXT:
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
assert( !"Framebuffer incomplete attachment" );
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
assert( !"Framebuffer missing attachment" );
case GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
assert( !"Framebuffer duplicate attachment" );
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
assert( !"Framebuffer dimensions" );
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
assert( !"Framebuffer formats" );
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
assert( !"Framebuffer draw buffer" );
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
assert( !"Framebuffer read buffer" );
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
assert( !"Framebuffer unsupported" );
default:
assert( !"Framebuffer error" );
}
// Zero the buffer.
$glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
set_framebuffer(o, v);
ready = true;
return true;
}
