trying to port tajs trinnity example

[ninogenio]

hey all im trying to port tajs trinnity 1k example to fb but im having trouble converting these two lines.

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// the vertex shader where most of the work is done...
const GLchar *vsh="\
varying vec4 c;\
void main(){\
gl_Position=gl_Vertex+\
vec4(gl_Normal,1)*\
abs(dot(sin((gl_Vertex+ftransform())*9.9),vec4(4)));\
c=cos(gl_Position*0.04)*length(gl_Position*0.04);\
}";

// the fragment shader - do as litte as possible here...
// take c and interpolate and ssign to the ouput fragcolor...
const GLchar *fsh="\
varying vec4 c;\
void main(){\
gl_FragColor=c;\
}";


and heres where ive got to

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Dim Shared As GLchar Ptr Vsh = " varying vec4 c; void main(){ gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertexftransform())*9.9),vec4(4))); c=cos(gl_Position*0.04)*length(gl_Position*0.04); }"

' the fragment shader - do as litte as possible here...
' take c and interpolate and ssign to the ouput fragcolor...
Dim Shared As GLchar Ptr Fsh = " varying vec4 c; void main(){ gl_FragColor=c; }"


i know this isnt right but i cant get it figured it out.

[Jim]

Best I can do is this

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defint a-z
option explicit

#include "gl/gl.bi"
#include "gl/glext.bi"

Dim shared Vsh As wstring * 169 => "varying vec4 c;void main(){gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertexftransform())*9.9),vec4(4)));c=cos(gl_Position*0.04)*length(gl_Position*0.04);}"

print len(Vsh)
print "|";
print Vsh;
print "|"

169 is the length of the string+1.

Which means you'll have to cast Vsh to GLchar Ptr when you use it.
I can't get FB to initialise anything except a built-in string type from a string.

Jim

[Jim]

Actually, it's going to be better if it's a zstring

Code Select Expand


Dim shared Vsh As zstring * 169 => "varying vec4 c;void main(){gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertexftransform())*9.9),vec4(4)));c=cos(gl_Position*0.04)*length(gl_Position*0.04);}"




Jim

[ninogenio]

cool thank you jim!

[ninogenio]

right ive got the whole trinity example ported with help from jim to fb here we go

Code Select Expand



' sek the intro fairy...
' use and abuse but a credit is a wonderful thing
' t2 sek would do.

' modifiyed for fb by nino

#include "windows.bi"
#include "GL/gl.bi"
#include "GL/glu.bi"
#include "GL/glext.bi"

Dim shared Vsh As zstring * 169 => "varying vec4 c;void main(){gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertexftransform())*9.9),vec4(4)));c=cos(gl_Position*0.04)*length(gl_Position*0.04);}"

' the fragment shader - do as litte as possible here...
' take c and interpolate and ssign to the ouput fragcolor...
Dim Shared Fsh As Zstring * 47 => "varying vec4 c; void main(){ gl_FragColor=c; }"

Type GenFP As Sub () Ptr
Dim Shared As GenFP glFP(7)

Dim Shared As String glnames(7)
glnames(0) = "glCreateShader"
glnames(1) = "glShaderSource"
glnames(2) = "glCompileShader"
glnames(3) = "glCreateProgram"
glnames(4) = "glAttachShader"
glnames(5) = "glLinkProgram"
glnames(6) = "glUseProgram"

Dim As GLuint V , F , P

Sub setShaders()

         Dim As Integer i
         Dim T As Zstring Ptr

         For i = 0 To 6
                 glFP( I ) = Cast( GenFP , wglGetProcAddress( glnames( I ) ) )
         Next

         V = Cast( PFNGLCREATESHADERPROC , glFP( 0 ) ) ( GL_VERTEX_SHADER )
         F = Cast( PFNGLCREATESHADERPROC , glFP( 0 ) ) ( GL_FRAGMENT_SHADER )
         P = Cast( PFNGLCREATEPROGRAMPROC , glFP( 3 ) ) ( )

         T = @vsh
         Cast( PFNGLSHADERSOURCEPROC , glFP(1) ) ( v , 1 , Cast( Byte Ptr Ptr , @T ) , NULL )
         Cast( PFNGLCOMPILESHADERPROC , glFP(2) ) ( v )

         T = @Fsh
         Cast( PFNGLSHADERSOURCEPROC , glFP(1) ) ( f , 1 , Cast( Byte Ptr Ptr , @T ) , NULL )
         Cast( PFNGLCOMPILESHADERPROC , glFP(2) ) ( f )

         Cast( PFNGLATTACHSHADERPROC , glFP(4) ) ( p , v )
         Cast( PFNGLATTACHSHADERPROC , glFP(4) ) ( p , f )

         Cast( PFNGLLINKPROGRAMPROC , glFP(5) ) ( p )
         Cast( PFNGLUSEPROGRAMPROC , glFP(6) ) ( p )

End Sub


Dim Shared As PIXELFORMATDESCRIPTOR pfd
Function WinMainCRTStartup() As Integer

   ' minimal windows setup code for opengl
   pfd.cColorBits = pfd.cDepthBits = 32
   pfd.dwFlags    = PFD_SUPPORT_OPENGL Or PFD_DOUBLEBUFFER

   Dim As HDC hDC
   hDC = GetDC ( CreateWindow("edit", 0, WS_POPUP Or WS_VISIBLE Or WS_CLIPSIBLINGS Or WS_CLIPCHILDREN Or WS_MAXIMIZE , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ) )
   SetPixelFormat ( hDC, ChoosePixelFormat ( hDC, @pfd) , @pfd )
   wglMakeCurrent ( hDC, wglCreateContext(hDC) )

   setShaders()
   ShowCursor(FALSE)

   do
         ' we draw 3 spheres using the same shader which is *very* senesitive to radius
         ' so we see a 3 fold effect ... a trinity
         glRotatef(3,3,3,3)
         gluSphere( gluNewQuadric() , 1.6 , 200 , 200 )
         gluSphere(gluNewQuadric(),1.04,200,200)
         gluSphere(gluNewQuadric(),0.4,200,200)
       SwapBuffers ( hDC )
   Loop while ( GetAsyncKeyState(VK_ESCAPE) = 0 )

   Return 0

End Function


End WinMainCRTStartup()


but there is a problem it doesnt look like its setting up the shaders? could some of you guys test it on your comps to let me know if it works ok.

ive not went through the tiny afying process yet because it isnt working right.

[Shockwave]

Ah, unfortunately it doesn't compile at all here.
What version of FB are you using mate?

[ninogenio]

im using v0.16b what errors do you get during the build.

here is the exe.

[Shockwave]

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Command executed:
"C:\FreeBasic\fbc.exe"  "C:\FreeBasic\FBIDETEMP.bas"

Compiler output:
C:\FreeBasic\inc\GL/glu.bi(192) : error 6: Expected '(', found: 'max'
declare function gluBuild1DMipmapLevels alias "gluBuild1DMipmapLevels" (byval target as GLenum, byval internalFormat as GLint, byval width as GLsizei, byval format as GLenum, byval type as GLenum, byval level as GLint, byval base as GLint, byval max as GLint, byval data as any ptr) as GLint
                                                                                                                                                                                                                                                          ^

Results:
Compilation failed

System:
FBIde: 0.4.6
fbc:   FreeBASIC Compiler - Version 0.15 for win32 (target:win32)
OS:    Windows XP (build 2600, Service Pack 2)


The exe you posted there runs but it is mashed up. I get a flickering white circle here.

[Shockwave]

(fails in glu.bi)

[ninogenio]

right i think your glu is conflicting with your windows header, what version of freebasic have you got? try changing max in your glu.h to smax might not work but it might.

and the results you see from the exe are the same as mine so there is something went wrong.

cheers for testing it.

[Jim]

Two bugs Nino.
First, you've lost a + somewhere in the vertex shader.  Should read

Code Select Expand


Dim shared Vsh As zstring * 170 => "varying vec4 c;void main(){gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertex+ftransform())*9.9),vec4(4)));c=cos(gl_Position*0.04)*length(gl_Position*0.04);}"



Second, V,F,P should be shared

Code Select Expand

Dim shared As GLuint V , F , P
After that it works fine with 0.16b and 0.17b

Jim

[ninogenio]

ahh thanks jim i really need to start yousing option explicit and i never even noticed i had lost a + there i went over it a good few times.

now im going to start the process of making it tiny to see if this one comes under 1k.

[Jim]

Yeah, option explicit helps, but then when you move to 0.17b it won't compile because it uses explicit by default and option explicit becomes an error (duh! it should just be ignored).

Jim

[ninogenio]

right heres where its at tonight the exe works and after making it tiny it goes to 1028 bytes.

Code Select Expand


' sek the intro fairy...
' use and abuse but a credit is a wonderful thing
' t2 sek would do.

' modifiyed for fb by nino

#include "windows.bi"
#include "GL/gl.bi"
#include "GL/glu.bi"
#include "GL/glext.bi"

declare Sub WinMainCRTStartup alias "WinMainCRTStartup"

Dim shared Vsh As zstring * 170 => "varying vec4 c;void main(){gl_Position=gl_Vertex+vec4(gl_Normal,1)*abs(dot(sin((gl_Vertex+ftransform())*9.9),vec4(4)));c=cos(gl_Position*0.04)*length(gl_Position*0.04);}"

' the fragment shader - do as litte as possible here...
' take c and interpolate and ssign to the ouput fragcolor...
Dim Shared Fsh As Zstring * 47 => "varying vec4 c; void main(){ gl_FragColor=c; }"

Type GenFP As Sub () Ptr
Dim Shared As GenFP glFP(7)

dim shared glnames(6) as zstring * 16 => {"glCreateShader", "glShaderSource", "glCompileShader", "glCreateProgram", "glAttachShader", "glLinkProgram", "glUseProgram"}


Dim Shared As GLuint V , F , P
Dim Shared As Integer i
Dim Shared Ts As Zstring Ptr
Dim Shared As PIXELFORMATDESCRIPTOR pfd
Dim Shared As HDC hDC

Sub WinMainCRTStartup()

   ' minimal windows setup code for opengl
   pfd.cColorBits = pfd.cDepthBits = 32
   pfd.dwFlags    = PFD_SUPPORT_OPENGL Or PFD_DOUBLEBUFFER

   hDC = GetDC ( CreateWindow("edit", 0, WS_POPUP Or WS_VISIBLE Or WS_CLIPSIBLINGS Or WS_CLIPCHILDREN Or WS_MAXIMIZE , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ) )
   SetPixelFormat ( hDC, ChoosePixelFormat( hDC, @pfd) , @pfd )
   wglMakeCurrent ( hDC, wglCreateContext(hDC) )

   For i = 0 To 6
           glFP( I ) = Cast( GenFP , wglGetProcAddress( glnames( I ) ) )
   Next

   V = Cast( PFNGLCREATESHADERPROC , glFP( 0 ) ) ( GL_VERTEX_SHADER )
   F = Cast( PFNGLCREATESHADERPROC , glFP( 0 ) ) ( GL_FRAGMENT_SHADER )
   P = Cast( PFNGLCREATEPROGRAMPROC , glFP( 3 ) ) ( )

   Ts = @vsh
   Cast( PFNGLSHADERSOURCEPROC , glFP(1) ) ( v , 1 , Cast( Byte Ptr Ptr , @Ts ) , NULL )
   Cast( PFNGLCOMPILESHADERPROC , glFP(2) ) ( v )

   Ts = @Fsh
   Cast( PFNGLSHADERSOURCEPROC , glFP(1) ) ( f , 1 , Cast( Byte Ptr Ptr , @Ts ) , NULL )
   Cast( PFNGLCOMPILESHADERPROC , glFP(2) ) ( f )

   Cast( PFNGLATTACHSHADERPROC , glFP(4) ) ( p , v )
   Cast( PFNGLATTACHSHADERPROC , glFP(4) ) ( p , f )

   Cast( PFNGLLINKPROGRAMPROC , glFP(5) ) ( p )
   Cast( PFNGLUSEPROGRAMPROC , glFP(6) ) ( p )

   ShowCursor(FALSE)

   do
         ' we draw 3 spheres using the same shader which is *very* senesitive to radius
         ' so we see a 3 fold effect ... a trinity
         glRotatef(3,3,3,3)
         gluSphere( gluNewQuadric() , 1.6 , 200 , 200 )
         gluSphere( gluNewQuadric() , 1.04 , 200 , 200 )
         gluSphere( gluNewQuadric() , 0.4 , 200 , 200 )
       SwapBuffers ( hDC )
   Loop while ( GetAsyncKeyState(VK_ESCAPE) = 0 )

End Sub


exe and project folder attached.

[Stonemonkey]

Verrry cool, I've only run it from the IDE.

[Jim]

Excellent, it should be easy to knock 4 bytes off for the magic 1Kb!

[ninogenio]

@fryer yeah it really is a cool demo and i just like to thank taj for giving his source to the forum.

@jim ive tried like mad to knock 4 bytes off but i cant figuare out how to get any more out of it any ideas?

[ninogenio]

done it!

i took out the spaces in the fragment program and reduced the string size and now its 1023 bytes yay 1k 

[Stonemonkey]

Do the spaces in this take up any room?

Dim Shared Fsh As Zstring * 47 => "varying vec4 c; void main(){ gl_FragColor=c; }"

edit: DOH!

Well done.

[ninogenio]

cheers fryer, it actually probably took me far longer to spot that than you