static void
DoSync(void)
{
CRMessage *in, out;
out.header.type = CR_MESSAGE_OOB;
if (render_spu.is_swap_master)
{
int a;
for (a = 0; a < render_spu.num_swap_clients; a++)
{
crNetGetMessage( render_spu.swap_conns[a], &in );
crNetFree( render_spu.swap_conns[a], in);
}
for (a = 0; a < render_spu.num_swap_clients; a++)
crNetSend( render_spu.swap_conns[a], NULL, &out, sizeof(CRMessage));
}
else
{
crNetSend( render_spu.swap_conns[0], NULL, &out, sizeof(CRMessage));
crNetGetMessage( render_spu.swap_conns[0], &in );
crNetFree( render_spu.swap_conns[0], in);
}
}
/**
* This is the guts of the binaryswap operation. Here, we call glReadPixels
* to read a region of the color and depth buffers from the parent (render
* SPU) window. We then begin the process of composition using binary swap.
* Each node does a glReadPixels and sends its swap region to its swap
* partner. Once we receive our partner's frame region, we use draw pixels to
* composite against our frame. This repeats for all swap partners. Once we
* have all of the regions composited against the one we are responsible for,
* we issue another read and send our region to final display by glDrawPixels
* (and some other GL functions) on the child/downstream SPU to send our region
* to the final display node.
* Input: window - the window we're processing
* startx, starty - glReadPixels start coordinates
* endx, endy - glReadPixels ending coordinates
*/
static void
CompositeNode(WindowInfo * window, int startx, int starty, int endx, int endy)
{
int i = 0;
int read_start_x = 0, read_start_y = 0;
int read_width = 0, read_height = 0;
CRMessage *incoming_msg = NULL;
GLubyte *incoming_color = NULL;
GLuint *incoming_depth = NULL;
BinarySwapMsg *render_info = NULL;
int draw_x = 0, draw_y = 0;
int draw_width = 0, draw_height = 0;
float other_depth = 0.0;
int recalc_end_x = 0, recalc_end_y = 0;
int recalc_start_x = 0, recalc_start_y = 0;
int recalc_temp;
CRASSERT(window->width > 0);
CRASSERT(window->height > 0);
/* figure out our portion for each stage */
for (i = 0; i < binaryswap_spu.stages; i++)
{
BinarySwapMsg *msg = (BinarySwapMsg *) window->msgBuffer;
/* set up message header */
msg->start_x = window->read_x[i];
msg->start_y = window->read_y[i];
msg->width = window->read_width[i];
msg->height = window->read_height[i];
msg->depth = binaryswap_spu.depth;
if (startx < window->read_x[i])
msg->clipped_x = window->read_x[i];
else
msg->clipped_x = startx;
if (starty < window->read_y[i])
msg->clipped_y = window->read_y[i];
else
msg->clipped_y = starty;
if (endx > (window->read_x[i] + window->read_width[i]))
msg->clipped_width =
(window->read_x[i] + window->read_width[i]) - msg->clipped_x;
else
msg->clipped_width = endx - msg->clipped_x;
if (endy > (window->read_y[i] + window->read_height[i]))
msg->clipped_height =
(window->read_y[i] + window->read_height[i]) - msg->clipped_y;
else
msg->clipped_height = endy - msg->clipped_y;
if (msg->clipped_width < 0)
msg->clipped_width = 0;
if (msg->clipped_height < 0)
msg->clipped_height = 0;
read_start_x = msg->clipped_x;
read_start_y = msg->clipped_y;
read_width = msg->clipped_width;
read_height = msg->clipped_height;
/* read our portion for this pass */
/* figure out which mode to use, depth or alpha */
if (binaryswap_spu.alpha_composite)
{
if (read_width > 0 && read_height > 0)
binaryswap_spu.super.ReadPixels(read_start_x, read_start_y,
read_width, read_height,
GL_RGBA, GL_UNSIGNED_BYTE,
(GLubyte *) window->msgBuffer +
binaryswap_spu.offset);
if (binaryswap_spu.highlow[i])
{
/* lower of pair => recv,send */
crNetGetMessage(binaryswap_spu.peer_recv[i], &incoming_msg);
crNetSend(binaryswap_spu.peer_send[i], NULL, window->msgBuffer,
(read_width * read_height * 4) + binaryswap_spu.offset);
}
else
{
/* higher of pair => send,recv */
crNetSend(binaryswap_spu.peer_send[i], NULL, window->msgBuffer,
(read_width * read_height * 4) + binaryswap_spu.offset);
crNetGetMessage(binaryswap_spu.peer_recv[i], &incoming_msg);
}
if (binaryswap_spu.mtu > binaryswap_spu.peer_send[i]->mtu)
binaryswap_spu.mtu = binaryswap_spu.peer_send[i]->mtu;
/* get render info from other node */
render_info = (BinarySwapMsg *) incoming_msg;
draw_x = render_info->clipped_x;
draw_y = render_info->clipped_y;
draw_width = render_info->clipped_width;
draw_height = render_info->clipped_height;
other_depth = render_info->depth;
if (draw_width > 0 && draw_height > 0)
{
/* get incoming fb */
incoming_color =
(GLubyte *) ((GLubyte *) incoming_msg + binaryswap_spu.offset);
/* figure out blend function based on z */
binaryswap_spu.super.Enable(GL_BLEND);
/* Other image is on top of ours! */
if (binaryswap_spu.depth > other_depth)
{
/* over operator */
binaryswap_spu.super.BlendFuncSeparateEXT(GL_SRC_ALPHA,
GL_ONE_MINUS_SRC_ALPHA,
GL_ONE, GL_ONE);
binaryswap_spu.super.WindowPos2iARB(draw_x, draw_y);
binaryswap_spu.super.DrawPixels(draw_width, draw_height,
GL_RGBA, GL_UNSIGNED_BYTE,
incoming_color);
}
/* other image is under ours */
else if(binaryswap_spu.depth < other_depth)
{
/* under operator */
binaryswap_spu.super.BlendFuncSeparateEXT(GL_ONE_MINUS_DST_ALPHA,
GL_DST_ALPHA,
GL_ONE,
GL_ONE);
binaryswap_spu.super.WindowPos2iARB(draw_x, draw_y);
binaryswap_spu.super.DrawPixels(draw_width, draw_height,
GL_RGBA, GL_UNSIGNED_BYTE,
incoming_color);
}
else
{
if(binaryswap_spu.highlow[i])
{
/* over operator */
binaryswap_spu.super.BlendFuncSeparateEXT(GL_SRC_ALPHA,
GL_ONE_MINUS_SRC_ALPHA,
GL_ONE, GL_ONE);
binaryswap_spu.super.WindowPos2iARB(draw_x, draw_y);
binaryswap_spu.super.DrawPixels(draw_width, draw_height,
GL_RGBA, GL_UNSIGNED_BYTE,
incoming_color);
}
else
{
/* under operator */
binaryswap_spu.super.BlendFuncSeparateEXT(GL_ONE_MINUS_DST_ALPHA,
GL_DST_ALPHA,
GL_ONE,
GL_ONE);
binaryswap_spu.super.WindowPos2iARB(draw_x, draw_y);
binaryswap_spu.super.DrawPixels(draw_width, draw_height,
GL_RGBA, GL_UNSIGNED_BYTE,
incoming_color);
}
}
if (binaryswap_spu.depth > other_depth)
{
binaryswap_spu.depth = other_depth;
}
}
}
else
{
/* depth composite */
if (read_width > 0 && read_height > 0)
{
GLubyte *colors =
(GLubyte *) window->msgBuffer + binaryswap_spu.offset;
GLuint *depths =
(GLuint *) ((GLubyte *) window->msgBuffer + /* base address */
(read_width * read_height * 3) + /* color information */
binaryswap_spu.offset); /* message header */
binaryswap_spu.super.ReadPixels(read_start_x, read_start_y,
read_width, read_height,
GL_RGB, GL_UNSIGNED_BYTE,
colors);
binaryswap_spu.super.ReadPixels(read_start_x, read_start_y,
read_width, read_height,
GL_DEPTH_COMPONENT, GL_UNSIGNED_INT,
depths);
}
if (binaryswap_spu.highlow[i])
{
/* lower of pair => recv,send */
crNetGetMessage(binaryswap_spu.peer_recv[i], &incoming_msg);
crNetSend(binaryswap_spu.peer_send[i], NULL, window->msgBuffer,
read_width * read_height * (3 + 4) + binaryswap_spu.offset);
}
else
{
/* higher of pair => send,recv */
crNetSend(binaryswap_spu.peer_send[i], NULL, window->msgBuffer,
read_width * read_height * (3 + 4) + binaryswap_spu.offset);
crNetGetMessage(binaryswap_spu.peer_recv[i], &incoming_msg);
}
if (binaryswap_spu.mtu > binaryswap_spu.peer_send[i]->mtu)
binaryswap_spu.mtu = binaryswap_spu.peer_send[i]->mtu;
/* get render info from other node */
render_info = (BinarySwapMsg *) incoming_msg;
draw_x = render_info->clipped_x;
draw_y = render_info->clipped_y;
draw_width = render_info->clipped_width;
draw_height = render_info->clipped_height;
if (draw_width > 0 && draw_height > 0)
{
/* get incoming fb */
incoming_color =
(GLubyte *) ((GLubyte *) incoming_msg + binaryswap_spu.offset);
incoming_depth =
(GLuint *) (incoming_color + draw_width * draw_height * 3);
binaryswap_spu.super.WindowPos2iARB(draw_x, draw_y);
/* Draw the depth image into the depth buffer, setting the stencil
* to one wherever we pass the Z test, clearinging to zero where
* we fail.
*/
binaryswap_spu.super.ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
binaryswap_spu.super.StencilOp(GL_KEEP, GL_ZERO, GL_REPLACE);
binaryswap_spu.super.StencilFunc(GL_ALWAYS, 1, ~0);
binaryswap_spu.super.Enable(GL_STENCIL_TEST);
binaryswap_spu.super.Enable(GL_DEPTH_TEST);
binaryswap_spu.super.DepthFunc(GL_LEQUAL);
binaryswap_spu.super.DrawPixels(draw_width, draw_height,
GL_DEPTH_COMPONENT,
GL_UNSIGNED_INT, incoming_depth);
/* Now draw the RGBA image, only where the stencil is one, reset
* stencil to zero as we go
* (to avoid calling glClear(STENCIL_BUFFER_BIT)).
*/
binaryswap_spu.super.Disable(GL_DEPTH_TEST);
binaryswap_spu.super.StencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
binaryswap_spu.super.StencilFunc(GL_EQUAL, 1, ~0);
binaryswap_spu.super.ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
binaryswap_spu.super.DrawPixels(draw_width, draw_height, GL_RGB,
GL_UNSIGNED_BYTE, incoming_color);
binaryswap_spu.super.Disable(GL_STENCIL_TEST);
}
}
/* make sure everything got drawn for next pass */
binaryswap_spu.super.Flush();
/* find optimal starting point for readback based on
this node's region and the partner's region */
recalc_start_x = render_info->start_x;
if (startx < render_info->clipped_x)
{
recalc_temp = startx;
}
else
{
recalc_temp = render_info->clipped_x;
if (render_info->clipped_width > 0 && render_info->clipped_height > 0)
startx = recalc_temp;
}
if (recalc_temp > recalc_start_x)
{
recalc_start_x = recalc_temp;
}
recalc_start_y = render_info->start_y;
if (starty < render_info->clipped_y)
{
recalc_temp = starty;
}
else
{
recalc_temp = render_info->clipped_y;
if (render_info->clipped_width > 0 && render_info->clipped_height > 0)
starty = recalc_temp;
}
if (recalc_temp > recalc_start_y)
{
recalc_start_y = recalc_temp;
}
/* find optimal ending point for readback based on
* this node's region and the partner's region
*/
recalc_end_x = render_info->start_x + render_info->width;
if (endx > (render_info->clipped_x + render_info->clipped_width))
{
recalc_temp = endx;
}
else
{
recalc_temp = (render_info->clipped_x + render_info->clipped_width);
if (render_info->clipped_width > 0 && render_info->clipped_height > 0)
endx = recalc_temp;
}
if (recalc_end_x > recalc_temp)
{
recalc_end_x = recalc_temp;
}
recalc_end_y = render_info->start_y + render_info->height;
if (endy > (render_info->clipped_y + render_info->clipped_height))
{
recalc_temp = endy;
}
else
{
recalc_temp = (render_info->clipped_y + render_info->clipped_height);
if (render_info->clipped_width > 0 && render_info->clipped_height > 0)
endy = recalc_temp;
}
if (recalc_end_y > recalc_temp)
{
recalc_end_y = recalc_temp;
}
/* clean up the memory allocated for the recv */
crNetFree(binaryswap_spu.peer_recv[i], incoming_msg);
}
draw_x = recalc_start_x;
draw_y = recalc_start_y;
draw_width = recalc_end_x - recalc_start_x;
draw_height = recalc_end_y - recalc_start_y;
if (draw_width > 0 && draw_height > 0)
{
/* send our final portion off to child */
binaryswap_spu.super.ReadPixels(draw_x, draw_y, draw_width, draw_height,
GL_RGB, GL_UNSIGNED_BYTE,
window->msgBuffer +
binaryswap_spu.offset);
/*
* Set the downstream viewport. If we don't do this, and the
* downstream window is resized, the glRasterPos command doesn't
* seem to be reliable. This is a problem both with Mesa and the
* NVIDIA drivers. Technically, this may not be a driver bug at
* all since we're doing funny stuff. Anyway, this fixes the problem.
* Note that the width and height are arbitrary since we only care
* about getting the origin right. glDrawPixels, glClear, etc don't
* care what the viewport size is. (BrianP)
*/
CRASSERT(window->width > 0);
CRASSERT(window->height > 0);
/* Begin critical region */
binaryswap_spu.child.SemaphorePCR(MUTEX_SEMAPHORE);
/* Update child window position, in case we're using the windowtracker
* and VNC SPUs.
*/
{
GLint pos[2];
binaryswap_spu.child.GetChromiumParametervCR(GL_WINDOW_POSITION_CR,
window->childWindow,
GL_INT, 2, pos);
if (pos[0] != window->child_xpos ||
pos[1] != window->child_ypos) {
binaryswap_spu.child.WindowPosition(window->childWindow,
pos[0], pos[1]);
window->child_xpos = pos[0];
window->child_ypos = pos[1];
}
}
binaryswap_spu.child.WindowPos2iARB(draw_x, draw_y);
binaryswap_spu.child.DrawPixels(draw_width, draw_height,
GL_RGB, GL_UNSIGNED_BYTE,
window->msgBuffer +
binaryswap_spu.offset);
/* end critical region */
binaryswap_spu.child.SemaphoreVCR(MUTEX_SEMAPHORE);
}
}
