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unit TextGL;
interface
uses gl, SDL, UTexture, Classes, ULog;
procedure BuildFont; // Build Our Bitmap Font
procedure KillFont; // Delete The Font
function glTextWidth(text: pchar): real; // Returns Text Width
procedure glPrintDone(text: pchar; Done: real; ColR, ColG, ColB, Alpha: real);
procedure glPrintLetter(letter: char);
procedure glPrintLetterCut(letter: char; Start, Finish: real);
procedure glPrint(text: pchar); // Custom GL "Print" Routine
procedure glPrintCut(text: pchar; Alpha: real);
procedure SetFontPos(X, Y: real); // Sets X And Y
procedure SetFontSize(Size: real);
procedure SetFontStyle(Style: integer); // sets active font style (normal, bold, etc)
procedure SetFontItalic(Enable: boolean); // sets italic type letter (works for all fonts)
procedure SetFontAspectW(Aspect: real);
type
TTextGL = record
X: real;
Y: real;
Text: string;
Size: real;
ColR: real;
ColG: real;
ColB: real;
end;
TFont = record
Tex: TTexture;
Width: array[0..255] of byte;
AspectW: real;
Centered: boolean;
Done: real;
Outline: real;
Italic: boolean;
end;
var
base: GLuint; // Base Display List For The Font Set
Fonts: array of TFont;
ActFont: integer;
PColR: real; // temps for glPrintDone
PColG: real;
PColB: real;
implementation
uses UMain, Windows, SysUtils, UGraphic;
procedure BuildFont; // Build Our Bitmap Font
var
Rejestr: TResourceStream;
Pet: integer;
begin
ActFont := 0;
SetLength(Fonts, 5);
Fonts[0].Tex := Texture.LoadTexture(true, 'Font', 'PNG', 'Font', 0);
Fonts[0].Tex.H := 30;
Fonts[0].AspectW := 0.9;
Fonts[0].Done := -1;
Fonts[0].Outline := 0;
Fonts[1].Tex := Texture.LoadTexture(true, 'FontB', 'PNG', 'Font', 0);
Fonts[1].Tex.H := 30;
Fonts[1].AspectW := 1;
Fonts[1].Done := -1;
Fonts[1].Outline := 0;
Fonts[2].Tex := Texture.LoadTexture(true, 'FontO', 'PNG', 'Font Outline', 0);
Fonts[2].Tex.H := 30;
Fonts[2].AspectW := 0.95;
Fonts[2].Done := -1;
Fonts[2].Outline := 5;
Fonts[3].Tex := Texture.LoadTexture(true, 'FontO2', 'PNG', 'Font Outline 2', 0);
Fonts[3].Tex.H := 30;
Fonts[3].AspectW := 0.95;
Fonts[3].Done := -1;
Fonts[3].Outline := 4;
{ Fonts[4].Tex := Texture.LoadTexture('FontO', 'BMP', 'Arrow', 0); // for score screen
Fonts[4].Tex.H := 30;
Fonts[4].AspectW := 0.95;
Fonts[4].Done := -1;
Fonts[4].Outline := 5;}
Rejestr := TResourceStream.Create(HInstance, 'Font', 'FNT');
Rejestr.Read(Fonts[0].Width, 256);
Rejestr.Free;
Rejestr := TResourceStream.Create(HInstance, 'FontB', 'FNT');
Rejestr.Read(Fonts[1].Width, 256);
Rejestr.Free;
Rejestr := TResourceStream.Create(HInstance, 'FontO', 'FNT');
Rejestr.Read(Fonts[2].Width, 256);
Rejestr.Free;
Rejestr := TResourceStream.Create(HInstance, 'FontO2', 'FNT');
Rejestr.Read(Fonts[3].Width, 256);
Rejestr.Free;
{ Rejestr := TResourceStream.Create(HInstance, 'FontO', 'FNT');
Rejestr.Read(Fonts[4].Width, 256);
Rejestr.Free;}
for Pet := 0 to 255 do
Fonts[1].Width[Pet] := Fonts[1].Width[Pet] div 2;
for Pet := 0 to 255 do
Fonts[2].Width[Pet] := Fonts[2].Width[Pet] div 2 + 2;
for Pet := 0 to 255 do
Fonts[3].Width[Pet] := Fonts[3].Width[Pet] + 1;
{ for Pet := 0 to 255 do
Fonts[4].Width[Pet] := Fonts[4].Width[Pet] div 2 + 2;}
end;
procedure KillFont; // Delete The Font
begin
// glDeleteLists(base, 256); // Delete All 96 Characters
end;
function glTextWidth(text: pchar): real;
var
Letter: char;
begin
// Log.LogStatus(Text, 'glTextWidth');
Result := 0;
while (length(text) > 0) do begin
Letter := Text[0];
text := pchar(Copy(text, 2, Length(text)-1));
Result := Result + Fonts[ActFont].Width[Ord(Letter)] * Fonts[ActFont].Tex.H / 30 * Fonts[ActFont].AspectW;
end; // while
end;
procedure glPrintDone(text: pchar; Done: real; ColR, ColG, ColB, Alpha: real);
begin
Fonts[ActFont].Done := Done;
PColR := ColR;
PColG := ColG;
PColB := ColB;
glPrintCut(text, Alpha);
Fonts[ActFont].Done := -1;
end;
procedure glPrintLetter(Letter: char);
var
TexX, TexY: real;
TexR, TexB: real;
FWidth: real;
PL, PT: real;
PR, PB: real;
XItal: real; // X shift for italic type letter
begin
with Fonts[ActFont].Tex do begin
FWidth := Fonts[ActFont].Width[Ord(Letter)];
W := FWidth * (H/30) * Fonts[ActFont].AspectW;
// H := 30;
// set texture positions
TexX := (ord(Letter) mod 16) * 1/16 + 1/32 - FWidth/1024 - Fonts[ActFont].Outline/1024;
TexY := (ord(Letter) div 16) * 1/16 + 2/1024; // 2/1024
TexR := (ord(Letter) mod 16) * 1/16 + 1/32 + FWidth/1024 + Fonts[ActFont].Outline/1024;
TexB := (1 + ord(Letter) div 16) * 1/16 - 2/1024;
// set vector positions
PL := X - Fonts[ActFont].Outline * (H/30) * Fonts[ActFont].AspectW /2;
PT := Y;
PR := PL + W + Fonts[ActFont].Outline * (H/30) * Fonts[ActFont].AspectW;
PB := PT + H;
if Fonts[ActFont].Italic = false then
XItal := 0
else
XItal := 12;
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, TexNum);
glBegin(GL_QUADS);
glTexCoord2f(TexX, TexY); glVertex2f(PL+XItal, PT);
glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
glTexCoord2f(TexR, TexY); glVertex2f(PR+XItal, PT);
glEnd;
X := X + W;
glDisable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
end; // with
end;
procedure glPrintLetterCut(letter: char; Start, Finish: real);
var
TexX, TexY: real;
TexR, TexB: real;
TexTemp: real;
FWidth: real;
PL, PT: real;
PR, PB: real;
OutTemp: real;
XItal: real;
begin
with Fonts[ActFont].Tex do begin
FWidth := Fonts[ActFont].Width[Ord(Letter)];
W := FWidth * (H/30) * Fonts[ActFont].AspectW;
// H := 30;
OutTemp := Fonts[ActFont].Outline * (H/30) * Fonts[ActFont].AspectW;
// set texture positions
TexX := (ord(Letter) mod 16) * 1/16 + 1/32 - FWidth/1024 - Fonts[ActFont].Outline/1024;
TexY := (ord(Letter) div 16) * 1/16 + 2/1024; // 2/1024
TexR := (ord(Letter) mod 16) * 1/16 + 1/32 + FWidth/1024 + Fonts[ActFont].Outline/1024;
TexB := (1 + ord(Letter) div 16) * 1/16 - 2/1024;
TexTemp := TexX + Start * (TexR - TexX);
TexR := TexX + Finish * (TexR - TexX);
TexX := TexTemp;
// set vector positions
PL := X - OutTemp / 2 + OutTemp * Start;
PT := Y;
PR := PL + (W + OutTemp) * (Finish - Start);
PB := PT + H;
if Fonts[ActFont].Italic = false then
XItal := 0
else
XItal := 12;
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, TexNum);
glBegin(GL_QUADS);
glTexCoord2f(TexX, TexY); glVertex2f(PL+XItal, PT);
glTexCoord2f(TexX, TexB); glVertex2f(PL, PB);
glTexCoord2f(TexR, TexB); glVertex2f(PR, PB);
glTexCoord2f(TexR, TexY); glVertex2f(PR+XItal, PT); // not tested with XItal
glEnd;
X := X + W * (Finish - Start);
glDisable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
end; // with
end;
procedure glPrint(text: pchar); // Custom GL "Print" Routine
var
Letter: char;
begin
if (Text = '') then // If There's No Text
Exit; // Do Nothing
while (length(text) > 0) do begin
// cut
Letter := Text[0];
Text := pchar(Copy(Text, 2, Length(Text)-1));
// print
glPrintLetter(Letter);
end; // while
end;
procedure glPrintCut(text: pchar; Alpha: real);
var
Letter: char;
PToDo: real;
PTotWidth: real;
PDoingNow: real;
S: string;
begin
if (Text = '') then // If There's No Text
Exit; // Do Nothing
PTotWidth := glTextWidth(Text);
PToDo := Fonts[ActFont].Done;
while (length(text) > 0) do begin
// cut
Letter := Text[0];
Text := pchar(Copy(Text, 2, Length(Text)-1));
// analyze
S := Letter;
PDoingNow := glTextWidth(pchar(S)) / PTotWidth;
// drawing
if (PToDo > 0) and (PDoingNow <= PToDo) then
glPrintLetter(Letter);
if (PToDo > 0) and (PDoingNow > PToDo) then begin
glPrintLetterCut(Letter, 0, PToDo / PDoingNow);
glColor4f(PColR, PColG, PColB, Alpha);
glPrintLetterCut(Letter, PToDo / PDoingNow, 1);
end;
if (PToDo <= 0) then
glPrintLetter(Letter);
PToDo := PToDo - PDoingNow;
end; // while
end;
procedure SetFontPos(X, Y: real);
begin
Fonts[ActFont].Tex.X := X;
Fonts[ActFont].Tex.Y := Y;
end;
procedure SetFontSize(Size: real);
begin
Fonts[ActFont].Tex.H := 30 * (Size/10);
end;
procedure SetFontStyle(Style: integer);
begin
ActFont := Style;
end;
procedure SetFontItalic(Enable: boolean);
begin
Fonts[ActFont].Italic := Enable;
end;
procedure SetFontAspectW(Aspect: real);
begin
Fonts[ActFont].AspectW := Aspect;
end;
end.
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