static IceTImage drawInvokeStrategy(void)
{
IceTImage image;
IceTVoid *value;
IceTEnum strategy;
IceTInt display_tile;
IceTInt valid_tile;
icetGetPointerv(ICET_DRAW_FUNCTION, &value);
if (value == NULL) {
icetRaiseError("Drawing function not set. Call icetDrawCallback.",
ICET_INVALID_OPERATION);
return icetImageNull();
}
icetRaiseDebug("Calling strategy");
icetStateSetBoolean(ICET_IS_DRAWING_FRAME, 1);
icetGetEnumv(ICET_STRATEGY, &strategy);
image = icetInvokeStrategy(strategy);
icetStateSetBoolean(ICET_IS_DRAWING_FRAME, 0);
/* Ensure that the returned image is the expected size. */
icetGetIntegerv(ICET_VALID_PIXELS_TILE, &valid_tile);
icetGetIntegerv(ICET_TILE_DISPLAYED, &display_tile);
if ((valid_tile != display_tile) && icetIsEnabled(ICET_COLLECT_IMAGES)) {
icetRaiseDebug2("Display tile: %d, valid tile: %d",
display_tile, valid_tile);
icetRaiseError("Got unexpected tile from strategy.",
ICET_SANITY_CHECK_FAIL);
}
if (valid_tile >= 0) {
const IceTInt *valid_tile_viewport
= icetUnsafeStateGetInteger(ICET_TILE_VIEWPORTS) + 4*valid_tile;
if ( (valid_tile_viewport[2] != icetImageGetWidth(image))
|| (valid_tile_viewport[3] != icetImageGetHeight(image)) ) {
IceTInt valid_offset;
IceTInt valid_num;
icetRaiseDebug1("Tile returned from strategy: %d\n", valid_tile);
icetRaiseDebug4("Expected size: %d %d. Returned size: %d %d",
valid_tile_viewport[2], valid_tile_viewport[3],
(int)icetImageGetWidth(image),
(int)icetImageGetHeight(image));
icetGetIntegerv(ICET_VALID_PIXELS_OFFSET, &valid_offset);
icetGetIntegerv(ICET_VALID_PIXELS_NUM, &valid_num);
icetRaiseDebug2("Reported pixel offset: %d. Reported pixel count: %d",
valid_offset, valid_num);
icetRaiseError("Got unexpected image size from strategy.",
ICET_SANITY_CHECK_FAIL);
}
}
icetStateCheckMemory();
return image;
}
static void callDestructor(IceTEnum dtor_variable)
{
IceTVoid *void_dtor_pointer;
void (*dtor_function)(void);
icetGetPointerv(dtor_variable, &void_dtor_pointer);
dtor_function = (void (*)(void))void_dtor_pointer;
if (dtor_function) {
(*dtor_function)();
}
}
void icetGLDrawCallbackFunction(const IceTDouble *projection_matrix,
const IceTDouble *modelview_matrix,
const IceTFloat *background_color,
const IceTInt *readback_viewport,
IceTImage result)
{
IceTSizeType width = icetImageGetWidth(result);
IceTSizeType height = icetImageGetHeight(result);
GLint gl_viewport[4];
glGetIntegerv(GL_VIEWPORT, gl_viewport);
/* Check OpenGL state. */
{
if ((gl_viewport[2] != width) || (gl_viewport[3] != height)) {
icetRaiseError("OpenGL viewport different than expected."
" Was it changed?", ICET_SANITY_CHECK_FAIL);
}
}
/* Set up OpenGL. */
{
/* Load the matrices. */
glMatrixMode(GL_PROJECTION);
glLoadMatrixd(projection_matrix);
glMatrixMode(GL_MODELVIEW);
glLoadMatrixd(modelview_matrix);
/* Set the clear color as the background IceT currently wants. */
glClearColor(background_color[0], background_color[1],
background_color[2], background_color[3]);
}
/* Call the rendering callback. */
{
IceTVoid *value;
IceTGLDrawCallbackType callback;
icetRaiseDebug("Calling OpenGL draw function.");
icetGetPointerv(ICET_GL_DRAW_FUNCTION, &value);
callback = (IceTGLDrawCallbackType)value;
(*callback)();
}
/* Temporarily stop render time while reading back buffer. */
icetTimingRenderEnd();
icetTimingBufferReadBegin();
/* Read the OpenGL buffers. */
{
IceTEnum color_format = icetImageGetColorFormat(result);
IceTEnum depth_format = icetImageGetDepthFormat(result);
IceTEnum readbuffer;
IceTSizeType x_offset = gl_viewport[0] + readback_viewport[0];
IceTSizeType y_offset = gl_viewport[1] + readback_viewport[1];
glPixelStorei(GL_PACK_ROW_LENGTH, (GLint)icetImageGetWidth(result));
/* These pixel store parameters are not working on one of the platforms
* I am testing on (thank you Mac). Instead of using these, just offset
* the buffers we read in from. */
/* glPixelStorei(GL_PACK_SKIP_PIXELS, readback_viewport[0]); */
/* glPixelStorei(GL_PACK_SKIP_ROWS, readback_viewport[1]); */
icetGetEnumv(ICET_GL_READ_BUFFER, &readbuffer);
glReadBuffer(readbuffer);
if (color_format == ICET_IMAGE_COLOR_RGBA_UBYTE) {
IceTUInt *colorBuffer = icetImageGetColorui(result);
glReadPixels((GLint)x_offset,
(GLint)y_offset,
(GLsizei)readback_viewport[2],
(GLsizei)readback_viewport[3],
GL_RGBA,
GL_UNSIGNED_BYTE,
colorBuffer + ( readback_viewport[0]
+ width*readback_viewport[1]));
} else if (color_format == ICET_IMAGE_COLOR_RGBA_FLOAT) {
IceTFloat *colorBuffer = icetImageGetColorf(result);
glReadPixels((GLint)x_offset,
(GLint)y_offset,
(GLsizei)readback_viewport[2],
(GLsizei)readback_viewport[3],
GL_RGBA,
GL_FLOAT,
colorBuffer + 4*( readback_viewport[0]
+ width*readback_viewport[1]));
} else if (color_format != ICET_IMAGE_COLOR_NONE) {
icetRaiseError("Invalid color format.", ICET_SANITY_CHECK_FAIL);
}
if (depth_format == ICET_IMAGE_DEPTH_FLOAT) {
IceTFloat *depthBuffer = icetImageGetDepthf(result);;
glReadPixels((GLint)x_offset,
(GLint)y_offset,
(GLsizei)readback_viewport[2],
(GLsizei)readback_viewport[3],
GL_DEPTH_COMPONENT,
GL_FLOAT,
depthBuffer + ( readback_viewport[0]
+ width*readback_viewport[1]));
} else if (depth_format != ICET_IMAGE_DEPTH_NONE) {
icetRaiseError("Invalid depth format.", ICET_SANITY_CHECK_FAIL);
}
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
/* glPixelStorei(GL_PACK_SKIP_PIXELS, 0); */
/* glPixelStorei(GL_PACK_SKIP_ROWS, 0); */
}
icetTimingBufferReadEnd();
/* Start render timer again. It's going to be shut off immediately on
return anyway, but the calling function expects it to be running. */
icetTimingRenderBegin();
}