{$INCLUDE "options.inc"}

unit uRender;

interface

uses SDLh, uTypes, GLunit;

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

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

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

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

procedure DrawSprite2(Sprite: TSprite; X, Y, FrameX, FrameY: LongInt);

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

procedure DrawTexture(X, Y: LongInt; Texture: PTexture; Scale: GLfloat = 1.0);

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

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

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

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

procedure DrawRotatedTex(Tex: PTexture; hw, hh, X, Y, Dir: LongInt; Angle: real);

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

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

procedure DrawFillRect(r: TSDL_Rect);

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

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

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

procedure Tint(c: Longword); inline;

var

    HHTexture: PTexture;

implementation

uses uVariables;

var

    lastTint: Longword;

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

begin

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

r.h:= Height;

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

end;

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

begin

DrawFromRect(X, Y, r^.w, r^.h, r, SourceTexture)

end;

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

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;

// don't 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);

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;

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, Length(VertexBuffer));

end;

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

begin

glPushMatrix;

glTranslatef(X, Y, 0);

glScalef(Scale, Scale, 1);

glBindTexture(GL_TEXTURE_2D, Texture^.id);

glVertexPointer(2, GL_FLOAT, 0, @Texture^.vb);

glTexCoordPointer(2, GL_FLOAT, 0, @Texture^.tb);

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

glPopMatrix

end;

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

begin

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

end;

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

var ft, fb, fl, fr: GLfloat;

    hw, nx, ny: LongInt;

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

begin

// don't 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;

glPushMatrix;

glTranslatef(X, Y, 0);

if Dir < 0 then

   glRotatef(Angle, 0, 0, -1)

else

   glRotatef(Angle, 0, 0,  1);

glTranslatef(Dir*OffsetX, OffsetY, 0);

glScalef(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;

nx:= round(Texture^.w / w); // number of horizontal frames

ny:= round(Texture^.h / h); // number of vertical frames

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

fb:= ((Frame mod ny) + 1) * Texture^.ry / ny;

fl:= (Frame div ny) * Texture^.rx / nx;

fr:= ((Frame div ny) + 1) * Texture^.rx / nx;

glBindTexture(GL_TEXTURE_2D, Texture^.id);

VertexBuffer[0].X:= -hw;

VertexBuffer[0].Y:= w / -2;

VertexBuffer[1].X:= hw;

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

VertexBuffer[2].X:= hw;

VertexBuffer[2].Y:= w / 2;

VertexBuffer[3].X:= -hw;

VertexBuffer[3].Y:= w / 2;

TextureBuffer[0].X:= fl;

TextureBuffer[0].Y:= ft;

TextureBuffer[1].X:= fr;

TextureBuffer[1].Y:= ft;

TextureBuffer[2].X:= fr;

TextureBuffer[2].Y:= fb;

TextureBuffer[3].X:= fl;

TextureBuffer[3].Y:= fb;

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

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

glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glPopMatrix

end;

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

begin

    DrawRotatedTex(SpritesData[Sprite].Texture,

        SpritesData[Sprite].Width,

        SpritesData[Sprite].Height,

        X, Y, Dir, Angle)

end;

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

begin

glPushMatrix;

glTranslatef(X, Y, 0);

if Dir < 0 then

   glRotatef(Angle, 0, 0, -1)

else

   glRotatef(Angle, 0, 0,  1);

if Dir < 0 then glScalef(-1.0, 1.0, 1.0);

DrawSprite(Sprite, -SpritesData[Sprite].Width div 2, -SpritesData[Sprite].Height div 2, Frame);

glPopMatrix

end;

procedure DrawRotatedTex(Tex: PTexture; hw, hh, X, Y, Dir: LongInt; Angle: real);

var VertexBuffer: array [0..3] of TVertex2f;

begin

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

if (abs(X) > 2 * hw) and ((abs(X) - hw) > cScreenWidth / cScaleFactor) then

    exit;

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

    exit;

glPushMatrix;

glTranslatef(X, Y, 0);

if Dir < 0 then

   begin

   hw:= - hw;

   glRotatef(Angle, 0, 0, -1);

   end else

   glRotatef(Angle, 0, 0,  1);

glBindTexture(GL_TEXTURE_2D, Tex^.id);

VertexBuffer[0].X:= -hw;

VertexBuffer[0].Y:= -hh;

VertexBuffer[1].X:= hw;

VertexBuffer[1].Y:= -hh;

VertexBuffer[2].X:= hw;

VertexBuffer[2].Y:= hh;

VertexBuffer[3].X:= -hw;

VertexBuffer[3].Y:= hh;

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

glTexCoordPointer(2, GL_FLOAT, 0, @Tex^.tb);

glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glPopMatrix

end;

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

var row, col, numFramesFirstCol: LongInt;

begin

numFramesFirstCol:= SpritesData[Sprite].imageHeight div SpritesData[Sprite].Height;

row:= Frame mod numFramesFirstCol;

col:= Frame div numFramesFirstCol;

DrawSprite2 (Sprite, X, Y, col, row);

end;

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

var r: TSDL_Rect;

begin

r.x:= 0;

r.y:= 0;

r.w:= SpritesData[Sprite].Width;

r.h:= SpritesData[Sprite].Height;

if (X < LeftX) then

    r.x:= LeftX - X;

if (Y < TopY) then

    r.y:= TopY - Y;

if (Y + SpritesData[Sprite].Height > BottomY) then

    r.h:= BottomY - Y + 1;

if (X + SpritesData[Sprite].Width > RightX) then

    r.w:= RightX - X + 1;

dec(r.h, r.y);

dec(r.w, r.x);

DrawFromRect(X + r.x, Y + r.y, @r, SpritesData[Sprite].Texture)

end;

procedure DrawSprite2(Sprite: TSprite; X, Y, FrameX, FrameY: LongInt);

var r: TSDL_Rect;

begin

    r.x:= FrameX * SpritesData[Sprite].Width;

    r.w:= SpritesData[Sprite].Width;

    r.y:= FrameY * SpritesData[Sprite].Height;

    r.h:= SpritesData[Sprite].Height;

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

end;

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

var scale: GLfloat;

begin

    if (Source^.w + 20) > cScreenWidth then

        scale:= cScreenWidth / (Source^.w + 20)

    else

        scale:= 1.0;

    DrawTexture(X - round(Source^.w * scale) div 2, Top, Source, scale)

end;

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

var VertexBuffer: array [0..3] of TVertex2f;

begin

    glDisable(GL_TEXTURE_2D);

    glEnable(GL_LINE_SMOOTH);

    glPushMatrix;

    glTranslatef(WorldDx, WorldDy, 0);

    glLineWidth(Width);

    Tint(r, g, b, a);

    VertexBuffer[0].X:= X0;

    VertexBuffer[0].Y:= Y0;

    VertexBuffer[1].X:= X1;

    VertexBuffer[1].Y:= Y1;

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

    glDrawArrays(GL_LINES, 0, Length(VertexBuffer));

    Tint($FF, $FF, $FF, $FF);

    glPopMatrix;

    glEnable(GL_TEXTURE_2D);

    glDisable(GL_LINE_SMOOTH);

end;

procedure DrawFillRect(r: TSDL_Rect);

var VertexBuffer: array [0..3] of TVertex2f;

begin

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

if (abs(r.x) > r.w) and ((abs(r.x + r.w / 2) - r.w / 2) * cScaleFactor > cScreenWidth) then

    exit;

if (abs(r.y) > r.h) and ((abs(r.y + r.h / 2 - (0.5 * cScreenHeight)) - r.h / 2) * cScaleFactor > cScreenHeight) then

    exit;

glDisable(GL_TEXTURE_2D);

Tint($00, $00, $00, $80);

VertexBuffer[0].X:= r.x;

VertexBuffer[0].Y:= r.y;

VertexBuffer[1].X:= r.x + r.w;

VertexBuffer[1].Y:= r.y;

VertexBuffer[2].X:= r.x + r.w;

VertexBuffer[2].Y:= r.y + r.h;

VertexBuffer[3].X:= r.x;

VertexBuffer[3].Y:= r.y + r.h;

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

glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

Tint($FF, $FF, $FF, $FF);

glEnable(GL_TEXTURE_2D)

end;

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

var

    i: LongInt;

    CircleVertex: array [0..359] of TVertex2f;

begin

    for i := 0 to 359 do begin

        CircleVertex[i].X := X + Radius*cos(i*pi/180);

        CircleVertex[i].Y := Y + Radius*sin(i*pi/180);

    end;

    glDisable(GL_TEXTURE_2D);

    glEnable(GL_LINE_SMOOTH);

    glPushMatrix;

    glLineWidth(Width);

    Tint(r, g, b, a);

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

    glDrawArrays(GL_LINE_LOOP, 0, 360);

    Tint($FF, $FF, $FF, $FF);

    glPopMatrix;

    glEnable(GL_TEXTURE_2D);

    glDisable(GL_LINE_SMOOTH);

end;

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

const VertexBuffer: array [0..3] of TVertex2f = (

        (x: -16; y: -16),

        (x:  16; y: -16),

        (x:  16; y:  16),

        (x: -16; y:  16));

var l, r, t, b: real;

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

begin

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

    if (abs(X) > 32) and ((abs(X) - 16) * cScaleFactor > cScreenWidth) then

        exit;

    if (abs(Y) > 32) and ((abs(Y - 0.5 * cScreenHeight) - 16) * cScaleFactor > cScreenHeight) then

        exit;

    t:= Pos * 32 / HHTexture^.h;

    b:= (Pos + 1) * 32 / HHTexture^.h;

    if Dir = -1 then

    begin

    l:= (Step + 1) * 32 / HHTexture^.w;

    r:= Step * 32 / HHTexture^.w

    end else

    begin

    l:= Step * 32 / HHTexture^.w;

    r:= (Step + 1) * 32 / HHTexture^.w

    end;

    glPushMatrix();

    glTranslatef(X, Y, 0);

    glRotatef(Angle, 0, 0, 1);

    glBindTexture(GL_TEXTURE_2D, HHTexture^.id);

    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, Length(VertexBuffer));

    glPopMatrix

end;

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

var nc: Longword;

begin

nc:= (a shl 24) or (b shl 16) or (g shl 8) or r;

if nc = lastTint then

    exit;

glColor4ub(r, g, b, a);

lastTint:= nc;

end;

procedure Tint(c: Longword); inline;

begin

Tint(((c shr 16) and $FF), ((c shr 8) and $FF), (c and $FF), $FF);

end;

end.