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VBSP 19(HL2) - Lightmaps

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Betreff des Beitrags: VBSP 19(HL2) - Lightmaps

Verfasst: Fr Sep 02, 2005 10:09

DGL Member

Registriert: Mi Jul 21, 2004 22:39
Beiträge: 360
Wohnort: UK, Scotland

Im having problems loading lightmaps... or converting the data.

Bild

As u can see from the pics the lightmaps unity makes (there is no colours or anything applyed other than a lightmap) are screwed.

Code:

for x := 0 to NumFaces-1 do
begin
If Faces[x].LightOffset < 0 then
begin
Lightmaps[x].TextureId := 0;
continue;
end;
 
Seek(f, Header.lumps[VBSP_LUMP_LIGHTMAPS].fileofs + Faces[x].LightOffset);
 
SetLength(ALightmap[0],(Faces[x].LightmapTextureSizeInLuxels[0]+1) * (Faces[x].LightmapTextureSizeInLuxels[1]+1));
 
BlockRead(F,ALightmap[0][0],(Faces[x].LightmapTextureSizeInLuxels[0]+1) * (Faces[x].LightmapTextureSizeInLuxels[1]+1)*SizeOf(TColorRGBExp32));
 
SetLength(Lightmaps[x].Data[0],(Faces[x].LightmapTextureSizeInLuxels[0]+1) * (Faces[x].LightmapTextureSizeInLuxels[1]+1));
 
for y := 0 to (Faces[x].LightmapTextureSizeInLuxels[0]+1) * (Faces[x].LightmapTextureSizeInLuxels[1]+1)-1 do
begin
Temp := Power(2,ALightmap[0][y].Exponent);
Lightmaps[x].Data[0][y] := SetVector(ALightmap[0][y].r*Temp,ALightmap[0][y].g*Temp,ALightmap[0][y].b*Temp);
end;
//Lightmaps[x].Data[0][y] := SetVector(Power(ALightmap[0][y].r,ALightmap[0][y].Exponent),Power(ALightmap[0][y].g,ALightmap[0][y].Exponent),Power(ALightmap[0][y].b,ALightmap[0][y].Exponent));
 
CreateLightmapTexture(Lightmaps[x].TextureId,Lightmaps[x],(Faces[x].LightmapTextureSizeInLuxels[0]),(Faces[x].LightmapTextureSizeInLuxels[1]));
WorkOutPercentage(TotalPer,x,CurrentPer,Percentage,Step);
end;
 
 
Procedure TVBSPMap.CreateLightmapTexture(var texture:GLUINT; pImageBits:TVBSPLightmap; width,height:integer);
begin
  // Generate a texture with the associative texture ID stored in the array
  glGenTextures(1, @texture);
  // This sets the alignment requirements for the start of each pixel row in memory.
  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  // Bind the texture to the texture arrays index and init the texture
  glBindTexture(GL_TEXTURE_2D, texture);
  // Change the lightmap gamma values by our desired gamma
 // ChangeGammaLightmap(pImageBits, width,height, Engine.Map.Gamma);
 
  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 
  //Assign the mip map levels
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 
  // Build Mipmaps (builds different versions of the picture for distances - looks better)
  gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, width, height, GL_RGB, GL_FLOAT, @pImageBits.data[0][0].X);
 
end;
 

Each colour is stored in the following

Code:

 
struct ColorRGBExp32
{
    byte r, g, b;
    signed char exponent;
};
 

Zitat:

Standard RGB format can be obtained from this by multiplying each colour component by 2^(exponent).

Code:

Temp := Power(2,ALightmap[0][y].Exponent);
Lightmaps[x].Data[0][y] := SetVector(ALightmap[0][y].r*Temp,ALightmap[0][y].g*Temp,ALightmap[0][y].b*Temp);

Im assuming the Power function acts like ^ in maths.

Currently im only loading one out of a possible 4 "styles" (each face can have what i guess to be 4 different lightmaps effecting it) but even if some have more styles, the colours im getting are a tad off for other styles to be the cause.

The offset seems to be correctly done

Zitat:

Each face gives a byte offset into the lighting lump in its lightofs member (if no lighting information is used for this face e.g. faces with skybox, nodraw and invisible textures, lightofs is -1.) There are (number of lightstyles)*(number of luxels) lightmap samples for each face, where each sample is a 4-byte ColorRGBExp32 structure

_________________
Free Map Editor - Game Requirements - Stucuk.Net
-Stu

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