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+---- Thread: OpenGL - GPU based rendering (GLList) (/showthread.php?tid=4009)
OpenGL - GPU based rendering (GLList) - Unseen Machine - 10-19-2025
Yo gang...
From MasterGy's question in another thread GPU based rendering is now a thing im really looking into/learning about but still no working (modern GL) versions to show yet! In the meantime...though very old and considered outdated GLLists does work!
Using it for animated models is not suggested but for anything static in your game, i.e, terrain, sky sphere/boxes, trees, rocks, etc...it's really useful
The main joy is you can make lists that call lists! This way rather than have separate lists for a skysphere and terrain, you can have ONE for the whole world! You can then easily extended this to adding trees, buildings, etc...
The second joy is you can also easily combine the loading of assets and list creation into one function...
Base Function :
Code: (Select All)
FUNCTION Make_List~&
'// Load things here
TmpList~& = _GLGENLISTS(1) '// Generate a temp handle for a single list
_GLNEWLIST TmpList~&, _GL_COMPILE '// Start making the list
'// YOU RENDER HERE
'// Draw everything thats static once and make a GPU procompiled list!
'// Then use glcalllist to draw it all...it renders much faster this way
_GLENDLIST '// Finihsed everything so stop making the lists
'// Return the GLList handle as _unsigned long (Remeber to chnage to match your actual function name)
Make_List~& = TmpList~&
END FUNCTIONYou will off course need to change the function name for each thing you want to make as a list in your program, remember to change the return value at the end of the function to match!
DEMO : in my dev program this modded version of that function returns a handle (as _unsigned long) for a world (sky and terrain)
Code: (Select All)
FUNCTION GDK_GL_Make_World_List~&
goodmap% = GDK_GL_Terrain_Load(Terrain, "Hill_HMap.png", "Hill_Texture.png", 90, 3900)
Terrain.Position.X = (Terrain.Width / 2) * Terrain.Scale.X
Terrain.Position.Z = (Terrain.Height / 2) * Terrain.Scale.Z
Terrain.Position.Y = -4200 ' Adjust terrain base position
TList~& = GDK_GL_Terrain_Make_List(Terrain)
Sky& = GDK_GL_Load_Texture("Sky.png")
SkyList~& = GDK_GL_CreateSphereList(15000, 200, 200, Sky&)
TmpList~& = _GLGENLISTS(1)
_GLNEWLIST TmpList~&, _GL_COMPILE
' === RENDER TERRAIN ===
_GLPUSHMATRIX
_GLLOADIDENTITY
_GLTRANSLATEF 0, Terrain.Position.Y, 0
_GLCALLLIST TList~&
_GLPOPMATRIX
'=== Render Sky sphere ===
_GLPUSHMATRIX
_GLLOADIDENTITY
_GLROTATEF 180, 1, 0, 0
_GLCALLLIST SkyList~&
_GLPOPMATRIX
_GLENDLIST '// Finihsed everything so stop making the lists
GDK_GL_Make_World_List~& = TmpList~&
END FUNCTION
to create it : World~& = GDK_GL_Make_World_List~& '// Sky and terrain are created once and stored as a single list
to render it : _GLCALLLIST World~& '// Draw the terrain and the sky
As you'll see it calls two other variants of the MAke_List function for the terrain and sphere...(as i said, lists inside lists!)
Anyway, hope you guys find it useful or at least informative.
Unseen