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|
void BSP::Draw()
{
UpdateDrawing();
glFrontFace(GL_CW);
//enable vertex arrays
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
//loop through faces
for(int i=0; i<numTotalFaces; ++i)
{
//if this face is to be drawn, draw it
if(facesToDraw.IsSet(i))
DrawFace(i);
}
//disable vertex arrays
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glFrontFace(GL_CCW);
}
//Draw a face
void BSP::DrawFace(int faceNumber)
{
//look this face up in the face directory
if(faceDirectory[faceNumber].faceType==0)
return;
if(faceDirectory[faceNumber].faceType==bspPolygonFace)
DrawPolygonFace(faceDirectory[faceNumber].typeFaceNumber);
if(faceDirectory[faceNumber].faceType==bspMeshFace)
DrawMeshFace(faceDirectory[faceNumber].typeFaceNumber);
if(faceDirectory[faceNumber].faceType==bspPatch)
DrawPatch(faceDirectory[faceNumber].typeFaceNumber);
}
//Draw a polygon face
void BSP::DrawPolygonFace(int polygonFaceNumber)
{
//skip this face if its texture was not loaded
if(isTextureLoaded[polygonFaces[polygonFaceNumber].textureIndex]==false)
return;
//set array pointers
glVertexPointer( 3, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].position);
//Unit 0 - decal textures
glTexCoordPointer( 2, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].decalS);
//Unit 1 - Lightmaps
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glTexCoordPointer(2, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].lightmapS);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
//bind textures
//unit 0 - decal texture
glBindTexture(GL_TEXTURE_2D, decalTextures[polygonFaces[polygonFaceNumber].textureIndex]);
//unit 1 - lightmap
glActiveTextureARB(GL_TEXTURE1_ARB);
if(polygonFaces[polygonFaceNumber].lightmapIndex>=0) //only bind a lightmap if one exists
glBindTexture( GL_TEXTURE_2D,
lightmapTextures[polygonFaces[polygonFaceNumber].lightmapIndex]);
else
glBindTexture(GL_TEXTURE_2D, whiteTexture);
glActiveTextureARB(GL_TEXTURE0_ARB);
//Draw face
glDrawArrays( GL_TRIANGLE_FAN, polygonFaces[polygonFaceNumber].firstVertexIndex,
polygonFaces[polygonFaceNumber].numVertices);
}
//Draw a mesh face
void BSP::DrawMeshFace(int meshFaceNumber)
{
//skip this face if its texture was not loaded
if(isTextureLoaded[meshFaces[meshFaceNumber].textureIndex]==false)
return;
//set array pointers
glVertexPointer( 3, GL_FLOAT, sizeof(BSP_VERTEX),
&vertices[meshFaces[meshFaceNumber].firstVertexIndex].position);
glTexCoordPointer( 2, GL_FLOAT, sizeof(BSP_VERTEX),
&vertices[meshFaces[meshFaceNumber].firstVertexIndex].decalS);
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glTexCoordPointer( 2, GL_FLOAT, sizeof(BSP_VERTEX),
&vertices[meshFaces[meshFaceNumber].firstVertexIndex].lightmapS);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
//bind textures
//unit 0 - decal texture
glBindTexture(GL_TEXTURE_2D, decalTextures[meshFaces[meshFaceNumber].textureIndex]);
//unit 1 - lightmap
glActiveTextureARB(GL_TEXTURE1_ARB);
if(meshFaces[meshFaceNumber].lightmapIndex>=0) //only bind a lightmap if one exists
glBindTexture(GL_TEXTURE_2D, lightmapTextures[meshFaces[meshFaceNumber].lightmapIndex]);
else
glBindTexture(GL_TEXTURE_2D, whiteTexture);
glActiveTextureARB(GL_TEXTURE0_ARB);
//draw the face, using meshIndices
if(!EXT_draw_range_elements_supported)
{
glDrawElements( GL_TRIANGLES, meshFaces[meshFaceNumber].numMeshIndices, GL_UNSIGNED_INT,
&meshIndices[meshFaces[meshFaceNumber].firstMeshIndex]);
}
else
{
glDrawRangeElementsEXT( GL_TRIANGLES, 0, meshFaces[meshFaceNumber].numVertices,
meshFaces[meshFaceNumber].numMeshIndices, GL_UNSIGNED_INT,
&meshIndices[meshFaces[meshFaceNumber].firstMeshIndex]);
}
}
//Draw a patch
void BSP::DrawPatch(int patchNumber)
{
//skip this patch if its texture was not loaded
if(isTextureLoaded[patches[patchNumber].textureIndex]==false)
return;
//bind textures
//unit 0 - decal texture
glBindTexture(GL_TEXTURE_2D, decalTextures[patches[patchNumber].textureIndex]);
//unit 1 - lightmap
glActiveTextureARB(GL_TEXTURE1_ARB);
if(patches[patchNumber].lightmapIndex>=0) //only bind a lightmap if one exists
glBindTexture(GL_TEXTURE_2D, lightmapTextures[patches[patchNumber].lightmapIndex]);
else
glBindTexture(GL_TEXTURE_2D, whiteTexture);
glActiveTextureARB(GL_TEXTURE0_ARB);
for(int i=0; i<patches[patchNumber].numQuadraticPatches; ++i)
patches[patchNumber].quadraticPatches[i].Draw();
}
//Tesselate a biquadratic patch
bool BSP_BIQUADRATIC_PATCH::Tesselate(int newTesselation)
{
int row=0;
tesselation=newTesselation;
float px, py;
BSP_VERTEX temp[3];
vertices=new BSP_VERTEX[(tesselation+1)*(tesselation+1)];
for(int v=0; v<=tesselation; ++v)
{
px=(float)v/tesselation;
vertices[v]=controlPoints[0]*((1.0f-px)*(1.0f-px))+
controlPoints[3]*((1.0f-px)*px*2)+
controlPoints[6]*(px*px);
}
for(int u=1; u<=tesselation; ++u)
{
py=(float)u/tesselation;
temp[0]=controlPoints[0]*((1.0f-py)*(1.0f-py))+
controlPoints[1]*((1.0f-py)*py*2)+
controlPoints[2]*(py*py);
temp[1]=controlPoints[3]*((1.0f-py)*(1.0f-py))+
controlPoints[4]*((1.0f-py)*py*2)+
controlPoints[5]*(py*py);
temp[2]=controlPoints[6]*((1.0f-py)*(1.0f-py))+
controlPoints[7]*((1.0f-py)*py*2)+
controlPoints[8]*(py*py);
for(int v=0; v<=tesselation; ++v)
{
px=(float)v/tesselation;
vertices[u*(tesselation+1)+v]= temp[0]*((1.0f-px)*(1.0f-px))+
temp[1]*((1.0f-px)*px*2)+
temp[2]*(px*px);
}
}
//Create indices
indices=new GLuint[tesselation*(tesselation+1)*2];
if(!indices)
{
cerr << "Unable to allocate memory for surface indices" << endl;
return false;
}
for(row=0; row<tesselation; ++row)
{
for(int point=0; point<=tesselation; ++point)
{
//calculate indices
//reverse them to reverse winding
indices[(row*(tesselation+1)+point)*2+1]=row*(tesselation+1)+point;
indices[(row*(tesselation+1)+point)*2]=(row+1)*(tesselation+1)+point;
}
}
//Fill in the arrays for multi_draw_arrays
trianglesPerRow=new int[tesselation];
rowIndexPointers=new unsigned int *[tesselation];
if(!trianglesPerRow || !rowIndexPointers)
{
cerr << "Unable to allocate memory for indices for multi_draw_arrays" << endl;
return false;
}
for(row=0; row<tesselation; ++row)
{
trianglesPerRow[row]=2*(tesselation+1);
rowIndexPointers[row]=&indices[row*2*(tesselation+1)];
}
return true;
}
//Draw a biquadratic patch
void BSP_BIQUADRATIC_PATCH::Draw()
{
//set array pointers
glVertexPointer(3, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].position);
glTexCoordPointer(2, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].decalS);
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glTexCoordPointer(2, GL_FLOAT, sizeof(BSP_VERTEX), &vertices[0].lightmapS);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
//Draw a triangle strip for each row
if(!EXT_multi_draw_arrays_supported)
{
for(int row=0; row<tesselation; ++row)
{
glDrawElements( GL_TRIANGLE_STRIP, 2*(tesselation+1), GL_UNSIGNED_INT,
&indices[row*2*(tesselation+1)]);
}
}
else
{
glMultiDrawElementsEXT( GL_TRIANGLE_STRIP, trianglesPerRow,
GL_UNSIGNED_INT, (const void **)rowIndexPointers,
tesselation);
}
}
void BSP::UpdateDrawing(void)
{
frustum.Update();
glPushAttrib(GL_ALL_ATTRIB_BITS);
//Set states for drawing map
//Set up texture units
//Unit 0 - replace with decal textures
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
//Unit 1
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_EXT, GL_PREVIOUS_EXT);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_EXT, GL_SRC_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_MODULATE);
glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_EXT, GL_TEXTURE);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_EXT, GL_SRC_COLOR);
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 2.0f);
/*CamPos.x=GSECamera->GetPositionX();
CamPos.y=GSECamera->GetPositionY();
CamPos.z=GSECamera->GetPositionZ();*/
CalculateVisibleFaces(CamPos, frustum);
} |
Problem d'affichage avec le multitexturing
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