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(*
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* Hedgewars, a free turn based strategy game
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* Copyright (c) 2009 Andrey Korotaev <unC0Rr@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*)
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unit uLandTexture;
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interface
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uses SDLh;
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procedure UpdateLandTexture(X, Width, Y, Height: LongInt);
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procedure DrawLand(dX, dY: LongInt);
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procedure FreeLand;
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implementation
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uses uMisc, uLand, uStore, GL, uConsts;
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const TEXSIZE = 256;
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LANDTEXARW = LAND_WIDTH div TEXSIZE;
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LANDTEXARH = LAND_HEIGHT div TEXSIZE;
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var
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LandTextures: array[0..LANDTEXARW - 1, 0..LANDTEXARH - 1] of
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record
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shouldUpdate: boolean;
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tex: PTexture;
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end;
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tmpPixels: array [0..TEXSIZE - 1, 0..TEXSIZE - 1] of LongWord;
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function Pixels(x, y: Longword): Pointer;
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var ty: Longword;
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begin
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for ty:= 0 to TEXSIZE - 1 do
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Move(LandPixels[y * TEXSIZE + ty, x * TEXSIZE], tmpPixels[ty, 0], sizeof(Longword) * TEXSIZE);
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Pixels:= @tmpPixels
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end;
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procedure UpdateLandTexture(X, Width, Y, Height: LongInt);
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var tx, ty: Longword;
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begin
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TryDo((X >= 0) and (X < LAND_WIDTH), 'UpdateLandTexture: wrong X parameter', true);
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TryDo(X + Width <= LAND_WIDTH, 'UpdateLandTexture: wrong Width parameter', true);
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TryDo((Y >= 0) and (Y < LAND_HEIGHT), 'UpdateLandTexture: wrong Y parameter', true);
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TryDo(Y + Height <= LAND_HEIGHT, 'UpdateLandTexture: wrong Height parameter', true);
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for ty:= Y div TEXSIZE to (Y + Height - 1) div TEXSIZE do
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for tx:= X div TEXSIZE to (X + Width - 1) div TEXSIZE do
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LandTextures[tx, ty].shouldUpdate:= true
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end;
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procedure RealLandTexUpdate;
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var x, y: LongWord;
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begin
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if LandTextures[0, 0].tex = nil then
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for x:= 0 to LANDTEXARW -1 do
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for y:= 0 to LANDTEXARH - 1 do
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with LandTextures[x, y] do
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tex:= NewTexture(TEXSIZE, TEXSIZE, Pixels(x, y))
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else
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for x:= 0 to LANDTEXARW -1 do
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for y:= 0 to LANDTEXARH - 1 do
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with LandTextures[x, y] do
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if shouldUpdate then
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begin
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glBindTexture(GL_TEXTURE_2D, tex^.id);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TEXSIZE, TEXSIZE, GL_RGBA, GL_UNSIGNED_BYTE, Pixels(x, y));
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end
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end;
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procedure DrawLand(dX, dY: LongInt);
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var x, y: LongInt;
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begin
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RealLandTexUpdate;
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for x:= 0 to LANDTEXARW -1 do
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for y:= 0 to LANDTEXARH - 1 do
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with LandTextures[x, y] do
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DrawTexture(dX + x * TEXSIZE, dY + y * TEXSIZE, tex)
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end;
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procedure FreeLand;
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var x, y: LongInt;
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begin
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for x:= 0 to LANDTEXARW -1 do
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for y:= 0 to LANDTEXARH - 1 do
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with LandTextures[x, y] do
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FreeTexture(tex)
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end;
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end.
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