(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

{$IF GLunit = GL}{$DEFINE GLunit:=GL,GLext}{$ENDIF}

unit uRender;

interface

procedure DrawSprite            (Sprite: TSprite; X, Y, Frame: LongInt);

procedure DrawSprite            (Sprite: TSprite; X, Y, FrameX, FrameY: LongInt);

procedure DrawSpriteFromRect    (Sprite: TSprite; r: TSDL_Rect; X, Y, Height, Position: LongInt); inline;

procedure DrawSpriteClipped     (Sprite: TSprite; X, Y, TopY, RightX, BottomY, LeftX: LongInt);

procedure DrawSpriteRotated     (Sprite: TSprite; X, Y, Dir: LongInt; Angle: real);

procedure DrawSpriteRotatedF    (Sprite: TSprite; X, Y, Frame, Dir: LongInt; Angle: real);

procedure DrawTexture           (X, Y: LongInt; Texture: PTexture); inline;

procedure DrawTexture           (X, Y: LongInt; Texture: PTexture; Scale: GLfloat);

procedure DrawTexture2          (X, Y: LongInt; Texture: PTexture; Scale, Overlap: GLfloat);

procedure DrawTextureFromRect   (X, Y: LongInt; r: PSDL_Rect; SourceTexture: PTexture); inline;

procedure DrawTextureFromRect   (X, Y, W, H: LongInt; r: PSDL_Rect; SourceTexture: PTexture); inline;

procedure DrawTextureFromRectDir(X, Y, W, H: LongInt; r: PSDL_Rect; SourceTexture: PTexture; Dir: LongInt);

procedure DrawTextureCentered   (X, Top: LongInt; Source: PTexture);

procedure DrawTextureF          (Texture: PTexture; Scale: GLfloat; X, Y, Frame, Dir, w, h: LongInt);

procedure DrawTextureRotated    (Texture: PTexture; hw, hh, X, Y, Dir: LongInt; Angle: real);

procedure DrawTextureRotatedF   (Texture: PTexture; Scale, OffsetX, OffsetY: GLfloat; X, Y, Frame, Dir, w, h: LongInt; Angle: real);

procedure DrawCircle            (X, Y, Radius, Width: LongInt);

procedure DrawCircle            (X, Y, Radius, Width: LongInt; r, g, b, a: Byte);

procedure DrawLine              (X0, Y0, X1, Y1, Width: Single; color: LongWord); inline;

procedure DrawLine              (X0, Y0, X1, Y1, Width: Single; r, g, b, a: Byte);

procedure DrawFillRect          (r: TSDL_Rect);

procedure DrawHedgehog          (X, Y: LongInt; Dir: LongInt; Pos, Step: LongWord; Angle: real);

procedure DrawScreenWidget      (widget: POnScreenWidget);

procedure DrawWaterBody         (pVertexBuffer: Pointer);

procedure Tint                  (r, g, b, a: Byte); inline;

procedure Tint                  (c: Longword); inline;

procedure untint(); inline;

procedure setTintAdd            (f: boolean); inline;

function isAreaOffscreen(X, Y, Width, Height: LongInt): boolean; inline;

// 0 => not offscreen, <0 => left/top of screen >0 => right/below of screen

function isDxAreaOffscreen(X, Width: LongInt): LongInt; inline;

function isDyAreaOffscreen(Y, Height: LongInt): LongInt; inline;

procedure openglTranslProjMatrix(X, Y, Z: GLFloat); inline;

procedure openglPushMatrix      (); inline;

procedure openglPopMatrix       (); inline;

procedure openglTranslatef      (X, Y, Z: GLfloat); inline;

procedure openglScalef          (ScaleX, ScaleY, ScaleZ: GLfloat); inline;

procedure openglRotatef         (RotX, RotY, RotZ: GLfloat; dir: LongInt); inline;

procedure openglTint            (r, g, b, a: Byte); inline;

implementation

uses uVariables;

{$IFDEF USE_TOUCH_INTERFACE}

const

    FADE_ANIM_TIME = 500;

    MOVE_ANIM_TIME = 500;

{$ENDIF}

var LastTint: LongWord = 0;

function isAreaOffscreen(X, Y, Width, Height: LongInt): boolean; inline;

begin

    isAreaOffscreen:= (isDxAreaOffscreen(X, Width) <> 0) or (isDyAreaOffscreen(Y, Height) <> 0);

end;

function isDxAreaOffscreen(X, Width: LongInt): LongInt; inline;

begin

    if X > ViewRightX then exit(1);

    if X + Width < ViewLeftX then exit(-1);

    isDxAreaOffscreen:= 0;

end;

function isDyAreaOffscreen(Y, Height: LongInt): LongInt; inline;

begin

    if Y > ViewBottomY then exit(1);

    if Y + Height < ViewTopY then exit(-1);

    isDyAreaOffscreen:= 0;

end;

procedure openglTranslProjMatrix(X, Y, Z: GLfloat); inline;

begin

{$IFDEF GL2}

    hglMatrixMode(MATRIX_PROJECTION);

    hglTranslatef(X, Y, Z);

    hglMatrixMode(MATRIX_MODELVIEW);

{$ELSE}

    glMatrixMode(GL_PROJECTION);

    glTranslatef(X, Y, Z);

    glMatrixMode(GL_MODELVIEW);

{$ENDIF}

end;

procedure openglPushMatrix(); inline;

begin

{$IFDEF GL2}

    hglPushMatrix();

{$ELSE}

    glPushMatrix();

{$ENDIF}

end;

procedure openglPopMatrix(); inline;

begin

{$IFDEF GL2}

    hglPopMatrix();

{$ELSE}

    glPopMatrix();

{$ENDIF}

end;

procedure openglTranslatef(X, Y, Z: GLfloat); inline;

begin

{$IFDEF GL2}

    hglTranslatef(X, Y, Z);

{$ELSE}

    glTranslatef(X, Y, Z);

{$ENDIF}

end;

procedure openglScalef(ScaleX, ScaleY, ScaleZ: GLfloat); inline;

begin

{$IFDEF GL2}

    hglScalef(ScaleX, ScaleY, ScaleZ);

{$ELSE}

    glScalef(ScaleX, ScaleY, ScaleZ);

{$ENDIF}

end;

procedure openglRotatef(RotX, RotY, RotZ: GLfloat; dir: LongInt); inline;

begin

{$IFDEF GL2}

    hglRotatef(RotX, RotY, RotZ, dir);

{$ELSE}

    glRotatef(RotX, RotY, RotZ, dir);

{$ENDIF}

end;

procedure openglUseColorOnly(b :boolean); inline;

begin

    if b then

        begin

        {$IFDEF GL2}

        glDisableVertexAttribArray(aTexCoord);

        glEnableVertexAttribArray(aColor);

        {$ELSE}

        glDisableClientState(GL_TEXTURE_COORD_ARRAY);

        glEnableClientState(GL_COLOR_ARRAY);

        {$ENDIF}

        end

    else

        begin

        {$IFDEF GL2}

        glDisableVertexAttribArray(aColor);

        glEnableVertexAttribArray(aTexCoord);

        {$ELSE}

        glDisableClientState(GL_COLOR_ARRAY);

        glEnableClientState(GL_TEXTURE_COORD_ARRAY);

        {$ENDIF}

        end;

end;

procedure DrawSpriteFromRect(Sprite: TSprite; r: TSDL_Rect; X, Y, Height, Position: LongInt); inline;

begin

r.y:= r.y + Height * Position;

r.h:= Height;

DrawTextureFromRect(X, Y, @r, SpritesData[Sprite].Texture)

end;

procedure DrawTextureFromRect(X, Y: LongInt; r: PSDL_Rect; SourceTexture: PTexture); inline;

begin

DrawTextureFromRectDir(X, Y, r^.w, r^.h, r, SourceTexture, 1)

end;

procedure DrawTextureFromRect(X, Y, W, H: LongInt; r: PSDL_Rect; SourceTexture: PTexture); inline;

begin

DrawTextureFromRectDir(X, Y, W, H, r, SourceTexture, 1)

end;

procedure DrawTextureFromRectDir(X, Y, W, H: LongInt; r: PSDL_Rect; SourceTexture: PTexture; Dir: LongInt);

var rr: TSDL_Rect;

    _l, _r, _t, _b: real;

    VertexBuffer, TextureBuffer: array [0..3] of TVertex2f;

begin

if (SourceTexture^.h = 0) or (SourceTexture^.w = 0) then

    exit;

// do not draw anything outside the visible screen space (first check fixes some sprite drawing, e.g. hedgehogs)

if (abs(X) > W) and ((abs(X + W / 2) - W / 2) > cScreenWidth / cScaleFactor) then

    exit;

if (abs(Y) > H) and ((abs(Y + H / 2 - (0.5 * cScreenHeight)) - H / 2) > cScreenHeight / cScaleFactor) then

    exit;

rr.x:= X;

rr.y:= Y;

rr.w:= W;

rr.h:= H;

_l:= r^.x / SourceTexture^.w * SourceTexture^.rx;

_r:= (r^.x + r^.w) / SourceTexture^.w * SourceTexture^.rx;

_t:= r^.y / SourceTexture^.h * SourceTexture^.ry;

_b:= (r^.y + r^.h) / SourceTexture^.h * SourceTexture^.ry;

glBindTexture(GL_TEXTURE_2D, SourceTexture^.id);

if Dir < 0 then

    begin

    VertexBuffer[0].X:= X + rr.w/2;

    VertexBuffer[0].Y:= Y;

    VertexBuffer[1].X:= X - rr.w/2;

    VertexBuffer[1].Y:= Y;

    VertexBuffer[2].X:= X - rr.w/2;

    VertexBuffer[2].Y:= rr.h + Y;

    VertexBuffer[3].X:= X + rr.w/2;

    VertexBuffer[3].Y:= rr.h + Y;

    end

else

    begin

    VertexBuffer[0].X:= X;

    VertexBuffer[0].Y:= Y;

    VertexBuffer[1].X:= rr.w + X;

    VertexBuffer[1].Y:= Y;

    VertexBuffer[2].X:= rr.w + X;

    VertexBuffer[2].Y:= rr.h + Y;

    VertexBuffer[3].X:= X;

    VertexBuffer[3].Y:= rr.h + Y;

    end;

TextureBuffer[0].X:= _l;

TextureBuffer[0].Y:= _t;

TextureBuffer[1].X:= _r;

TextureBuffer[1].Y:= _t;

TextureBuffer[2].X:= _r;

TextureBuffer[2].Y:= _b;

TextureBuffer[3].X:= _l;

TextureBuffer[3].Y:= _b;

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);

glTexCoordPointer(2, GL_FLOAT, 0, @TextureBuffer[0]);

glDrawArrays(GL_TRIANGLE_FAN, 0, High(VertexBuffer) - Low(VertexBuffer) + 1);

end;

procedure DrawTexture(X, Y: LongInt; Texture: PTexture); inline;

begin

    DrawTexture(X, Y, Texture, 1.0);

end;

procedure DrawTexture(X, Y: LongInt; Texture: PTexture; Scale: GLfloat);

begin

openglPushMatrix;

openglTranslatef(X, Y, 0);

openglScalef(Scale, Scale, 1);

glBindTexture(GL_TEXTURE_2D, Texture^.id);

SetVertexPointer(@Texture^.vb, Length(Texture^.vb));

SetTexCoordPointer(@Texture^.tb, Length(Texture^.vb));

{$IFDEF GL2}

UpdateModelviewProjection;

{$ENDIF}

glDrawArrays(GL_TRIANGLE_FAN, 0, Length(Texture^.vb));

openglPopMatrix;

end;

{ this contains tweaks in order to avoid land tile borders in blurry land mode }

procedure DrawTexture2(X, Y: LongInt; Texture: PTexture; Scale, Overlap: GLfloat);

var

    TextureBuffer: array [0..3] of TVertex2f;

begin

openglPushMatrix;

openglTranslatef(X, Y, 0);

openglScalef(Scale, Scale, 1);

glBindTexture(GL_TEXTURE_2D, Texture^.id);

TextureBuffer[0].X:= Texture^.tb[0].X + Overlap;

TextureBuffer[0].Y:= Texture^.tb[0].Y + Overlap;

TextureBuffer[1].X:= Texture^.tb[1].X - Overlap;

TextureBuffer[1].Y:= Texture^.tb[1].Y + Overlap;

TextureBuffer[2].X:= Texture^.tb[2].X - Overlap;

TextureBuffer[2].Y:= Texture^.tb[2].Y - Overlap;

TextureBuffer[3].X:= Texture^.tb[3].X + Overlap;

TextureBuffer[3].Y:= Texture^.tb[3].Y - Overlap;

SetVertexPointer(@Texture^.vb, Length(Texture^.vb));

SetTexCoordPointer(@TextureBuffer, Length(Texture^.vb));

UpdateModelviewProjection;

glDrawArrays(GL_TRIANGLE_FAN, 0, Length(Texture^.vb));

openglPopMatrix;

end;

procedure DrawTextureF(Texture: PTexture; Scale: GLfloat; X, Y, Frame, Dir, w, h: LongInt);

begin

    DrawTextureRotatedF(Texture, Scale, 0, 0, X, Y, Frame, Dir, w, h, 0)

end;

procedure DrawTextureRotatedF(Texture: PTexture; Scale, OffsetX, OffsetY: GLfloat; X, Y, Frame, Dir, w, h: LongInt; Angle: real);

var ft, fb, fl, fr: GLfloat;

    hw, hh, nx, ny: LongInt;

    VertexBuffer, TextureBuffer: array [0..3] of TVertex2f;

begin

// do not draw anything outside the visible screen space (first check fixes some sprite drawing, e.g. hedgehogs)

if (abs(X) > W) and ((abs(X + dir * OffsetX) - W / 2) * cScaleFactor > cScreenWidth) then

    exit;

if (abs(Y) > H) and ((abs(Y + OffsetY - (0.5 * cScreenHeight)) - W / 2) * cScaleFactor > cScreenHeight) then

    exit;

openglPushMatrix;

openglTranslatef(X, Y, 0);

if Dir = 0 then Dir:= 1;

if Angle <> 0 then

    openglRotatef(Angle, 0, 0, Dir);

if (OffsetX <> 0) or (OffsetY <> 0) then

    openglTranslatef(Dir*OffsetX, OffsetY, 0);

if Scale <> 1.0 then

    openglScalef(Scale, Scale, 1);

// Any reason for this call? And why only in t direction, not s?

//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

if Dir > 0 then

    hw:=  w div 2

else

    hw:= -w div 2;

hh:= h div 2;

nx:= Texture^.w div w; // number of horizontal frames

ny:= Texture^.h div h; // number of vertical frames

ft:= (Frame mod ny) * Texture^.ry / ny;