nehe 10 with picking

BlitzMax Forums/OpenGL Module/nehe 10 with picking

Chris C (Posted 2005) [#1]

a modified version of the nehe 10 "move around a world" demo, with polygon picking and mouse movement You will need a texture (file name specified in last function) and the world.txt file from nehe 10 tut. mouse to look lmb forwards tris in pick list red, nearest green space bar toggles poly flashing Enjoy Strict Global ScreenWidth:Float=800 Global ScreenHeight:Float=600 Global ScreenDepth:Int=32 'Global Checkimage:Byte[256,256,3] Global Texname Type VERTEX ' 3D Coordinates Field x:Float, y:Float, z:Float ' Texture Coordinates Field u:Float, v:Float End Type Global numtriangles:Int ' Number Of Triangles In Sector Global mytriangles:VERTEX[] ' Array Of Triangles Global hilight:Int[] Global state:Int[] Global lastspace Global dist:Int[] Global worldfile:String="world.txt" Global light:Int ' Lighting ON/OFF Global blend:Int ' Blending ON/OFF Global xrot:Float ' X Rotation Global yrot:Float ' Y Rotation Global walkbias:Float Global walkbiasangle:Float Global lookupdown:Float=0.0 Global heading:Float=0.0 Global xpos:Float=0.0 Global zpos:Float=0.0 Global filter:Int=0 ' Which Filter To Use Global LightAmbient:Float[]=[0.5, 0.5, 0.5, 1.0] ' Ambient Light Global LightDiffuse:Float[]=[1.0, 1.0, 1.0, 1.0] ' Diffuse Light Global LightPosition:Float[]=[0.0, 0.0, 2.0, 1.0] ' Light Position Global m:Int,fc Global s:String="" HideMouse bglCreateContext(ScreenWidth,ScreenHeight,ScreenDepth,0,BGL_BACKBUFFER | BGL_DEPTHBUFFER | BGL_FULLSCREEN) bglSetSwapInterval(1) InitGl() SetupWorld() ShowMouse Global selectbuffer:Int[512],hits Local Framecounter_counter:Int,Framecounter_time,Framecounter_framerate Global viewport:Int[4] While Not KeyHit( KEY_ESCAPE ) glenable(GL_TEXTURE_2D) nehe10() glDisable(GL_TEXTURE_2D) glcolor3f 1.0,1.0,1.0 bglDrawText("Nehe lesson 10",10,24) bglDrawText("hits "+hits,10,34) Local y=44 s:+"#" Local f=Instr(s,"#",1) Repeat Local l:String= Left(s,f-1) s= Right(s,Len(s)-f) bglDrawText(l,10,y) y:+12 f=Instr(s,"#",1) Until f=0 FlushMem bglSwapBuffers fc:+1 Wend End Function InitGl() LoadGlTextures() glEnable GL_TEXTURE_2D glBlendFunc GL_SRC_ALPHA, GL_ONE glClearColor(0.0, 0.0, 0.0, 0.0) glClearDepth 1.0 glDepthFunc GL_LESS glEnable GL_DEPTH_TEST glShadeModel(GL_SMOOTH) glViewport(0,0,ScreenWidth,ScreenHeight) glMatrixMode(GL_PROJECTION) glLoadIdentity() gluPerspective(45.0,Float(ScreenWidth)/Float(ScreenHeight),0.1,100.0) glMatrixMode(GL_MODELVIEW) glLightfv GL_LIGHT0, GL_AMBIENT, Float Ptr LightAmbient glLightfv GL_LIGHT0, GL_DIFFUSE, Float Ptr LightDiffuse glLightfv GL_LIGHT0, GL_POSITION, Float Ptr LightPosition glEnable GL_LIGHT0 End Function Function nehe10() Local x_m:Float; Local y_m:Float; Local z_m:Float; Local u_m:Float ; Local v_m:Float Local xtrans:Float; Local ztrans:Float; Local ytrans:Float Local sceneroty:Float Local loop_m:Int If KeyHit(KEY_B) Then blend = Not blend EndIf If blend = 0 Then glDisable GL_BLEND glEnable GL_DEPTH_TEST Else glEnable GL_BLEND ' glDisable GL_DEPTH_TEST End If If KeyHit(KEY_L) Then light = Not light EndIf If light=0 Then glDisable(GL_LIGHTING) Else glEnable(GL_LIGHTING) EndIf If KeyDown(KEY_PAGEUP) Then lookupdown = lookupdown - 0.1 End If If KeyDown(KEY_PAGEDOWN) Then lookupdown = lookupdown + 0.1 End If If KeyDown(KEY_UP) Or MouseDown(1) Then xpos = xpos - Float(Sin(heading)) * 0.1 zpos = zpos - Float(Cos(heading)) * 0.1 End If If KeyDown(KEY_DOWN) Or MouseDown(2) Then xpos = xpos + Float(Sin(heading)) * 0.1 zpos = zpos + Float(Cos(heading)) * 0.1 End If If KeyDown(KEY_RIGHT) Then heading = heading - 1 End If If KeyDown(KEY_LEFT) Then heading = heading + 1 End If yrot = heading xtrans=-xpos ztrans=-zpos ytrans= - 0.5 sceneroty = 360.0 - yrot glClear GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT lookupdown=lookupdown+(MouseY()-ScreenHeight/2.0)/8 heading=heading-(MouseX()-Screenwidth/2.0)/8 MoveMouse screenwidth/2,screenheight/2 '''''''''''''''''''''''''''''''''''''''''''''''picking glSelectBuffer(512,Varptr selectBuffer[0]); glRenderMode(GL_SELECT) glInitNames(); glGetIntegerv(GL_VIEWPORT, viewport); glMatrixMode(GL_PROJECTION); ' // Selects The Projection Matrix glPushMatrix(); ' // Push The Projection Matrix glLoadIdentity(); gluPickMatrix(ScreenWidth/2.0, ScreenHeight/2.0, 1, 1, viewport); gluPerspective(45.0,Float(ScreenWidth)/Float(ScreenHeight),0.1,100.0) glMatrixMode(GL_MODELVIEW); glLoadIdentity glRotatef lookupdown, 1.0, 0, 0 glRotatef sceneroty, 0, 1.0, 0 glTranslatef xtrans, ytrans, ztrans glBindTexture GL_TEXTURE_2D, Texname ' gldisable GL_DEPTH_TEST ' Process Each Triangle For loop_m = 0 To (numtriangles - 1)*3 Step 3 glPushName(loop_m/3); glBegin GL_TRIANGLES glNormal3f 0.0, 0.0, 1.0 x_m = mytriangles[loop_m+0].x y_m = mytriangles[loop_m+0].y z_m = mytriangles[loop_m+0].z u_m = mytriangles[loop_m+0].u v_m = mytriangles[loop_m+0].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m x_m = mytriangles[loop_m+1].x y_m = mytriangles[loop_m+1].y z_m = mytriangles[loop_m+1].z u_m = mytriangles[loop_m+1].u v_m = mytriangles[loop_m+1].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m x_m = mytriangles[loop_m+2].x y_m = mytriangles[loop_m+2].y z_m = mytriangles[loop_m+2].z u_m = mytriangles[loop_m+2].u v_m = mytriangles[loop_m+2].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m glEnd glpopname() Next glFlush(); ' // Select The Modelview Matrix hits=glRenderMode(GL_RENDER); glMatrixMode(GL_PROJECTION); ' // Select The Projection Matrix glPopMatrix(); ' // Pop The Projection Matrix glMatrixMode(GL_MODELVIEW); glcolor4f 1.0,1.0,1.0,1.0 glEnable GL_DEPTH_TEST If hits>0 Then processhits(hits,Varptr selectBuffer[0]) '''''''' '''''''''' end picking glLoadIdentity glRotatef lookupdown, 1.0, 0, 0 glRotatef sceneroty, 0, 1.0, 0 glTranslatef xtrans, ytrans, ztrans glBindTexture GL_TEXTURE_2D, Texname ' Process Each Triangle Local n:Int=0 For loop_m = 0 To (numtriangles - 1)*3 Step 3 glBegin GL_TRIANGLES If hilight[n]= 0 Then glcolor3f 1.0,1.0,1.0 If hilight[n]=1 Then glcolor3f 1.0,0.0,0.0 hilight[n]=0 EndIf If hilight[n]= 2 Then glcolor3f 0.0,1.0,0.0 hilight[n]=0 endif If state[n] And (fc Mod 60)>30 Then glcolor3f 0.5,0.5,1.0 End If n:+1 glNormal3f 0.0, 0.0, 1.0 x_m = mytriangles[loop_m+0].x y_m = mytriangles[loop_m+0].y z_m = mytriangles[loop_m+0].z u_m = mytriangles[loop_m+0].u v_m = mytriangles[loop_m+0].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m x_m = mytriangles[loop_m+1].x y_m = mytriangles[loop_m+1].y z_m = mytriangles[loop_m+1].z u_m = mytriangles[loop_m+1].u v_m = mytriangles[loop_m+1].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m x_m = mytriangles[loop_m+2].x y_m = mytriangles[loop_m+2].y z_m = mytriangles[loop_m+2].z u_m = mytriangles[loop_m+2].u v_m = mytriangles[loop_m+2].v glTexCoord2f u_m,v_m ; glVertex3f x_m,y_m,z_m glEnd Next End Function Function processhits:string(hits:Int,sb:Int Ptr) s="hits="+hits Local low:Float low=Var (sb+1) Local ply:Int=Var (sb+3) For Local x=0 To hits-1 s=s+"#polys "+Var(sb) Local p=Var sb sb:+1 Local d1:Float=Var sb s:+" d1="+d1 sb:+1 Local d2:Float=Var sb s:+" d2="+d2 sb:+1 If ((d1+d2)/2) < low Then low=((d1+d2)/2) ply=Var sb End if s:+"#" For Local n=1 To p s:+" name=" + Var sb hilight[Var sb]=1 sb:+1 Next Next hilight[ply]=2 If KeyDown(key_space) And lastspace Then state[ply]=Not state[ply] lastspace=false endif If Not KeyDown(key_space) Then lastspace=true s:+"#low ply="+ply End Function Function SetupWorld() Local i:Int Local c:Int Local boom:Int Local vert:Int Local oneline:String Local sstring:String Local file=OpenFile(worldfile) Repeat oneline=ReadLine(file) If Left(oneline, 11) = "NUMPOLLIES " Then sstring=Mid(oneline, 12) numtriangles=sstring.ToInt() Exit End If Until Eof(file) mytriangles=mytriangles:VERTEX[..numtriangles*3] hilight=hilight:Int[..numtriangles] state=state:Int[..numtriangles] For c = 0 To numtriangles - 1 For vert = 0 To 2 boom = 0 Repeat oneline=ReadLine(file) oneline = Trim(oneline) If oneline <> "" Then If Left(oneline, 2) <> "//" Then mytriangles[c*3+vert]=New VERTEX mytriangles[c*3+vert].x = oneline.ToFloat() i = Instr(oneline, " ") oneline = Trim(Mid(oneline, i)) mytriangles[c*3+vert].y = oneline.ToFloat() i = Instr(oneline, " ") oneline = Trim(Mid(oneline, i)) mytriangles[c*3+vert].z = oneline.ToFloat() i = Instr(oneline, " ") oneline = Trim(Mid(oneline, i)) mytriangles[c*3+vert].u = oneline.ToFloat() i = Instr(oneline, " ") oneline = Trim(Mid(oneline, i)) mytriangles[c*3+vert].v = oneline.ToFloat() boom = 1 End If End If Until boom = 1 Next Next CloseStream file End Function Function LoadGlTextures() Local PointeurImg:Byte Ptr Local TexWidth Local TexHeight Local tex:TPixmap=LoadPixmap("metal.bmp") texname=bglTexFromPixmap(tex) ' Create MipMapped Texture glBindTexture GL_TEXTURE_2D, Texname glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR glTexParameteri GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST End Function

Clyde (Posted 2005) [#2]

Greatest, im now onto Lesson 10. However, I cant for the life of me find the media and text documents. anywhere. Where are they please?