lua_math/mathrender_server.lua at master · quiret/lua_math · GitHub

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-- Created by The_GTA. If you use this please mention my name somewhere.
-- Script to create a render buffer out of a scene.
localstring=string;

localfunctionto_color_item(a, r, g, b)
returnstring.char(b) ..string.char(g) ..string.char(r) ..string.char(a);
end

localfunctioncolor_idx(x, y, width)
return ( ( y*width ) +x ) +1;
end

-- Creates a backbuffer which is a string of bytes that can have certain dimensions.
-- Can be merged using table.concat to be fed to texture engines.
localfunctioncreate_backbuffer( width, height, alphaClear, redClear, greenClear, blueClear )
localbbuf= {};
localitems= {};

localclear_color=to_color_item(alphaClear, redClear, greenClear, blueClear);

fory=0,height-1,1do
forx=0,width-1,1do
localcolor_idx=color_idx(x, y, width);

items[color_idx] =clear_color;
end
end

bbuf.width=width;
bbuf.height=height;
bbuf.items=items;

returnbbuf;
end

-- Sets the color of a single pixel on the backbuffer, if possible.
localfunctionset_pixel_on_bbuf(bbuf, xpos, ypos, alpha, red, green, blue)
localwidth=bbuf.width;
localheight=bbuf.height;

localypos_int=math.floor(ypos);

if ( ypos_int<1 ) or ( ypos_int>height ) then
returnfalse;
end

localxpos_int=math.floor(xpos);

if ( xpos_int<1 ) or ( xpos_int>width ) then
returnfalse;
end

localcidx=color_idx(xpos_int, ypos_int, width);

bbuf.items[cidx] =to_color_item(alpha, red, green, blue);
returntrue;
end

-- Draws a 2d plane, which resides in screen space, on the backbuffer.
-- The plane can be of any form, like a square or triangle.
localfunctiondraw_plane_on_bbuf(bbuf, plane, doDebug)
-- plane is expected to be in screen coordinates.
localscreenPlane=createPlane2D(0, 0, bbuf.width, 0, 0, bbuf.height);

-- Uncomment this to have triangle planes.
--plane.addSupremumPolynomeU( 1, -1 );

localu_inter, v_inter=plane.intersectPlane2D(screenPlane, doDebug);

ifnot ( u_inter ) then
returnfalse;
end

-- Go through each valid u coordinate and draw all the associated v coordinates.
localnum_drawn_pixels=0;
localnum_skipped_pixels=0;

form,ninipairs(u_inter) do
localmin_v=n.interval.min;
localmax_v=n.interval.max;
localmin_u=n.min_poly.minInterval(min_v, max_v);
localmax_u=n.max_poly.maxInterval(min_v, max_v);

localdiff_u= ( max_u-min_u );
localdiff_v= ( max_v-min_v );

localdiff_v_pixels=math.ceil(diff_v*bbuf.height);

localstart_x, start_y=screenPlane.transformPoint( min_u, min_v );
start_y=math.floor(start_y);

fory=0,diff_v_pixels-1,1do
localabs_y= ( start_y+y );
localabs_v= ( abs_y/bbuf.height );

-- Since we know the dimensions of the to-be-drawn surface we can process by scan-lines.
localblock_min_u=n.min_poly.evaluate( abs_v );
localblock_max_u=n.max_poly.evaluate( abs_v );

localblock_diff_u= ( block_max_u-block_min_u );

localblock_diff_u_pixels= ( block_diff_u*bbuf.width );

localblock_start_x=math.floor( block_min_u*bbuf.width );

forx=0,block_diff_u_pixels-1,1do
localabs_x= ( block_start_x+x );

localabs_u= ( abs_x/bbuf.width );

-- Idea: you could look up inside of a texture for each (abs_u, abs_v) tuple and load the real color.
-- This way we could draw real textured polygons.

set_pixel_on_bbuf(bbuf, abs_x, abs_y, 255, 100, 100, 100);

num_drawn_pixels=num_drawn_pixels+1;
end
end
end

returntrue, num_drawn_pixels, num_skipped_pixels;
end

-- It is actually undocumented, but plain pixels have two unsigned shorts that define the
-- size of the image at the tail.

localfunctionnum_to_ushort_bytes(num)
localinteger=math.floor(num);
locallower= ( integer%256 );
localupper=math.floor( integer/256 ) %256;

returnstring.char(lower, upper);
end

-- Some test planes that reside in screen space.
localtest_planes= {
createPlane2D(10, 10, 300, 10, 0, 50),
createPlane2D(400, 400, 100, 100, 100, -100),
createPlane2D(800, 800, -150, -100, 10, 50),
createPlane2D(0, 300, 150, 0, 0, 100)
};

-- Draws a backbuffer and sends it in "plain" format to all clients.
addCommandHandler("send_bbuf", function()
localbbuf=create_backbuffer(640, 480, 255, 255, 0, 50);

localdoDebug=false;

localtime_start=getTickCount();

form,ninipairs(test_planes) do
localgotToDraw, numDrawn, numSkipped=draw_plane_on_bbuf(bbuf, n, doDebug);

if ( gotToDraw ) and ( doDebug ) then
outputDebugString( "drawn " ..numDrawn.." pixels (skipped " ..numSkipped..")" );
end
end

localtime_end=getTickCount();
localms_diff= ( time_end-time_start );

outputDebugString( "render time: " ..ms_diff.."ms" );

localbbuf_width_ushort=num_to_ushort_bytes( bbuf.width );
localbbuf_height_ushort=num_to_ushort_bytes( bbuf.height );

localpixels_str=table.concat(bbuf.items);

localbbuf_string=
pixels_str..
 ( bbuf_width_ushort..
bbuf_height_ushort );

localplayers=getElementsByType("player");

form,ninipairs(players) do
triggerClientEvent(n, "onServerTransmitImage", root, bbuf_string);
end

outputDebugString("sent backbuffer to clients");
end
);