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Skinning (samples/gu/skinning)

 
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soywiz



Joined: 26 Feb 2008
Posts: 2
PostPosted: Tue Feb 26, 2008 1:44 am    Post subject: Skinning (samples/gu/skinning) Reply with quote
I have been working about a couple of weeks in a psp emulator with an integrated debugger. The aim of the project is be able to debug psp applications and games.
I based the project in the great work of pspplayer and pspsdk.

Currently I'm trying to implement more complicated GE stuff like Skinning. But skinning is broken at this moment:


Without morphing (emulator):


With morphing (emulator) (bad implemented):


With morphing (psp):



I'm using opengl shaders to implement GE rendering.

Vertex shader:
Code:

// Transform2D flag
uniform bool transform2D;
uniform mat4 boneMatrix;
uniform vec2 boneOffset;

// Sprites
uniform vec4 spriteCenter;
attribute int spriteCorner;

// Morphing
uniform mat4 BoneMatrix[8];
uniform int morphCount;
attribute float morphWeight[8];

void doSkinning(inout vec4 vertex) {
   vec4 pos = vec4(0, 0, 0, 0);
   
   for (int n = 0; n < morphCount; n++) {
      pos += (morphWeight[n] * vertex) * (transpose(BoneMatrix[n]) * morphWeight[n]);
   }
   
   vertex = pos;
}

void main() {
   vec4 pos = gl_Vertex;

   gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
   //lightDir = normalize(vec3(gl_LightSource[0].position));
   gl_FrontColor = gl_Color;

   if (transform2D) {
      gl_Position = ftransform();
      return;
   }
   
   if (morphCount) {
      doSkinning(pos);
   }
   
   gl_Position = gl_ModelViewProjectionMatrix * pos;
}


Fragment shader:
Code:

// Color LookUp Table
uniform sampler1D clut;
uniform bool clutUse;
uniform int clutOffset;
uniform bool textureUse;

// Texture
uniform sampler2D tex;

void main() {
   vec4 color;
   
   // If there is clut
   if (clutUse) {
      // tex must have GL_NEAR
      color = texture2D(tex, gl_TexCoord[0].st);
      color = texture1D(clut, color.r + clutOffset);
   } else {
      if (textureUse) {
         color = gl_Color * texture2D(tex, gl_TexCoord[0].st);
      } else {
         color = gl_Color;
      }
   }
   
   gl_FragColor = color;
}


I pass weights per vertex and bone matrixes, to vertex shader.
But it's obviusly bad implemented:

Code:

void doSkinning(inout vec4 vertex) {
   vec4 pos = vec4(0, 0, 0, 0);
   
   for (int n = 0; n < morphCount; n++) {
      pos += (morphWeight[n] * vertex) * (transpose(BoneMatrix[n]) * morphWeight[n]);
   }
   
   vertex = pos;
}


I found this url: http://graphics.ucsd.edu/courses/cse169_w05/3-Skin.htm
but I'm a completly newbie in skinning.

Someone can help me with that?

(Sorry about my bad english)

Thanks in advance,

Last edited by soywiz on Wed Feb 27, 2008 1:00 am; edited 1 time in total
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soywiz



Joined: 26 Feb 2008
Posts: 2
PostPosted: Tue Feb 26, 2008 2:46 am    Post subject: Re: Skinning (samples/gu/skinning) Reply with quote
woops, I quoted message instead of editing (and I can't delete it). Well, there is the url of the emu:
http://www.soywiz.com/d/pspemulator/

Source code is a mess, but I'll improve it when I know how to focus some things. It's only a sketch so I don't want to make it public yet.
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ReJ



Joined: 04 Apr 2004
Posts: 25
Location: Lithuania, Vilnius
PostPosted: Thu Feb 28, 2008 9:14 pm    Post subject: Reply with quote
You skinning code should look more like that:

Code:
void doSkinning(inout vec4 vertex, in float boneWeight[]) {
   vec4 pos = vec4(0, 0, 0, 0);
   
   for (int n = 0; n < weightCount; n++) {
      pos += (BoneMatrix[n] * vertex) * boneWeight[n];
   }
   
   vertex = pos;
}


Btw, it seems that you are using "skinning" and "morphing" terms interchangeably - but they are different things. PSP can do both, bone skinning and geometry morphing, even more they can be combined (as in gu/morphskin sample).
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noxa



Joined: 05 Aug 2006
Posts: 39
PostPosted: Tue Mar 11, 2008 12:08 am    Post subject: Reply with quote
wow someone else working on an emulator - nice!

not sure if that makes me want to work harder on mine, or sit back and watch you finish yours :)
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