1 | unit UMethodOpenGL;
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2 |
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3 | {$mode delphi}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, SysUtils, UDrawMethod, UFastBitmap
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9 | {$IFDEF OPENGL}, GL, GLExt, OpenGLContext{$ENDIF};
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10 |
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11 | {$IFDEF OPENGL}
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12 | type
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13 | { TMethodOpenGL }
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14 |
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15 | TMethodOpenGL = class(TDrawMethodOpenGL)
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16 | constructor Create; override;
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17 | destructor Destroy; override;
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18 | procedure DrawFrame(FastBitmap: TFastBitmap); override;
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19 | end;
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20 | {$ENDIF}
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21 |
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22 |
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23 | implementation
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24 |
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25 | {$IFDEF OPENGL}
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26 | { TMethodOpenGL }
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27 |
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28 | constructor TMethodOpenGL.Create;
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29 | begin
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30 | inherited Create;
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31 | Caption := 'OpenGL';
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32 | PaintObject := poOpenGL;
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33 | Description.Add('This method use OpenGL 3D acceleration with simple one 2D orthogonal plane covering all visible area.' +
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34 | 'Texture data is loaded from bitmap.');
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35 | end;
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36 |
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37 | destructor TMethodOpenGL.Destroy;
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38 | begin
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39 | inherited Destroy;
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40 | end;
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41 |
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42 | procedure TMethodOpenGL.DrawFrame(FastBitmap: TFastBitmap);
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43 | var
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44 | X, Y: Integer;
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45 | P: PCardinal;
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46 | R: PCardinal;
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47 | const
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48 | GL_CLAMP_TO_EDGE = $812F;
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49 | begin
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50 | glLoadIdentity;
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51 | glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
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52 | //glLoadIdentity; { clear the matrix }
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53 | //glTranslatef(0.0, 0.0, -3.0); // -2.5); { viewing transformation }
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54 |
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55 | P := OpenGLBitmap;
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56 | with FastBitmap do
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57 | for Y := 0 to Size.Y - 1 do begin
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58 | R := P;
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59 | for X := 0 to Size.X - 1 do begin
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60 | //R^ := Round($ff * (Y / Size.Y)) or $ff000000;
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61 | R^ := NoSwapBRComponent(Pixels[X, Y]) or $ff000000;
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62 | Inc(R);
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63 | end;
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64 | Inc(P, Size.X);
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65 | end;
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66 |
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67 | //glRotatef(30.0, 0, 0, 1.0);
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68 | glTranslatef(-OpenGLControl.Width div 2, -OpenGLControl.Height div 2, 0.0);
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69 |
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70 | glEnable(GL_TEXTURE_2D);
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71 | glBindTexture(GL_TEXTURE_2D, TextureId);
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72 | //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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73 | //glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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74 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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75 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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76 | glTexImage2D(GL_TEXTURE_2D, 0, 4, OpenGLControl.Width, OpenGLControl.Height,
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77 | 0, GL_RGBA, GL_UNSIGNED_BYTE, OpenGLBitmap);
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78 | //glTexImage2D(GL_TEXTURE_2D, 0, 4, 512, 256,
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79 | //0, GL_RGBA, GL_UNSIGNED_BYTE, OpenGLBitmap);
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80 |
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81 | //Define how alpha blending will work and enable alpha blending.
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82 | //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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83 | //glEnable(GL_BLEND);
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84 |
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85 | glBegin(GL_QUADS);
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86 | //glBegin(GL_POLYGON);
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87 | glColor3ub(255, 255, 255);
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88 | glTexCoord2f(0, 0);
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89 | glVertex3f(0, 0, 0);
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90 | glTexCoord2f(OpenGLControl.Width div 2, 0);
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91 | glVertex3f(OpenGLControl.Width, 0, 0);
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92 | glTexCoord2f(OpenGLControl.Width div 2, OpenGLControl.Height div 2);
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93 | glVertex3f(OpenGLControl.Width, OpenGLControl.Height, 0);
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94 | glTexCoord2f(0, OpenGLControl.Height div 2);
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95 | glVertex3f(0, OpenGLControl.Height, 0);
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96 | glEnd();
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97 |
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98 | OpenGLControl.SwapBuffers;
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99 | end;
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100 |
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101 | {$ENDIF}
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102 |
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103 | end.
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104 |
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