void CStatMeshInstance::Draw(unsigned flags)
{
guard(CStatMeshInstance::Draw);
int i;
if (!pMesh->Lods.Num()) return;
/*const*/ CStaticMeshLod& Mesh = pMesh->Lods[LodNum]; //?? not 'const' because of BuildTangents(); change this?
int NumSections = Mesh.Sections.Num();
if (!NumSections || !Mesh.NumVerts) return;
// if (!Mesh.HasNormals) Mesh.BuildNormals();
if (!Mesh.HasTangents) Mesh.BuildTangents();
// copy of CSkelMeshInstance::Draw sorting code
#if SORT_BY_OPACITY
// sort sections by material opacity
int SectionMap[MAX_MESHMATERIALS];
int secPlace = 0;
for (int opacity = 0; opacity < 2; opacity++)
{
for (i = 0; i < NumSections; i++)
{
UUnrealMaterial *Mat = Mesh.Sections[i].Material;
int op = 0; // sort value
if (Mat && Mat->IsTranslucent()) op = 1;
if (op == opacity) SectionMap[secPlace++] = i;
}
}
assert(secPlace == NumSections);
#endif // SORT_BY_OPACITY
// draw mesh
glEnable(GL_LIGHTING);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Position);
glNormalPointer(GL_FLOAT, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Normal);
glTexCoordPointer(2, GL_FLOAT, sizeof(CStaticMeshVertex), &Mesh.Verts[0].UV[UVIndex].U);
/*??
Can move tangent/binormal setup here too, but this will require to force shader to use fixed attribute locations
(use glBindAttribLocation before glLinkProgram instead of querying atttribute via glGetAtribLocation).
In this case:
- can remove GCurrentShader
- can eliminate hasTangent checks below and always bind attributes (when supports GL2.0)
- can share code between SkeletalMesh and StaticMesh:
- sort sections
- setup arrays; differences:
- position and normals are taken from different arrays in static and skeletal meshes
- ShowInfluences in SkeletalMeshInstance should disable material binding
- draw sections using glDrawElements()
- un-setup arrays
- use VAO+VBO for rendering
*/
for (i = 0; i < NumSections; i++)
{
#if SORT_BY_OPACITY
int MaterialIndex = SectionMap[i];
#else
int MaterialIndex = i;
#endif
const CMeshSection &Sec = Mesh.Sections[MaterialIndex];
if (!Sec.NumFaces) continue;
SetMaterial(Sec.Material, MaterialIndex);
// check tangent space
GLint aTangent = -1, aBinormal = -1;
bool hasTangent = false;
const CShader *Sh = GCurrentShader;
if (Sh)
{
aTangent = Sh->GetAttrib("tangent");
aBinormal = Sh->GetAttrib("binormal");
hasTangent = (aTangent >= 0 && aBinormal >= 0);
}
if (hasTangent)
{
glEnableVertexAttribArray(aTangent);
glEnableVertexAttribArray(aBinormal);
glVertexAttribPointer(aTangent, 3, GL_FLOAT, GL_FALSE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Tangent);
glVertexAttribPointer(aBinormal, 3, GL_FLOAT, GL_FALSE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Binormal);
}
// draw
//?? place this code into CIndexBuffer?
if (Mesh.Indices.Is32Bit())
glDrawElements(GL_TRIANGLES, Sec.NumFaces * 3, GL_UNSIGNED_INT, &Mesh.Indices.Indices32[Sec.FirstIndex]);
else
glDrawElements(GL_TRIANGLES, Sec.NumFaces * 3, GL_UNSIGNED_SHORT, &Mesh.Indices.Indices16[Sec.FirstIndex]);
// disable tangents
if (hasTangent)
{
glDisableVertexAttribArray(aTangent);
glDisableVertexAttribArray(aBinormal);
}
}
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisable(GL_LIGHTING);
BindDefaultMaterial(true);
// draw mesh normals
if (flags & DF_SHOW_NORMALS)
{
int NumVerts = Mesh.NumVerts;
glBegin(GL_LINES);
glColor3f(0.5, 1, 0);
for (i = 0; i < NumVerts; i++)
{
glVertex3fv(Mesh.Verts[i].Position.v);
CVec3 tmp;
VectorMA(Mesh.Verts[i].Position, 2, Mesh.Verts[i].Normal, tmp);
glVertex3fv(tmp.v);
}
#if SHOW_TANGENTS
glColor3f(0, 0.5f, 1);
for (i = 0; i < NumVerts; i++)
{
const CVec3 &v = Mesh.Verts[i].Position;
glVertex3fv(v.v);
CVec3 tmp;
VectorMA(v, 2, Mesh.Verts[i].Tangent, tmp);
glVertex3fv(tmp.v);
}
glColor3f(1, 0, 0.5f);
for (i = 0; i < NumVerts; i++)
{
const CVec3 &v = Mesh.Verts[i].Position;
glVertex3fv(v.v);
CVec3 tmp;
VectorMA(v, 2, Mesh.Verts[i].Binormal, tmp);
glVertex3fv(tmp.v);
}
#endif // SHOW_TANGENTS
glEnd();
}
unguard;
}
void CStatMeshInstance::Draw(unsigned flags)
{
guard(CStatMeshInstance::Draw);
int i;
if (!pMesh->Lods.Num()) return;
/*const*/ CStaticMeshLod& Mesh = pMesh->Lods[LodNum]; //?? not 'const' because of BuildTangents(); change this?
int NumSections = Mesh.Sections.Num();
if (!NumSections || !Mesh.NumVerts) return;
// if (!Mesh.HasNormals) Mesh.BuildNormals();
if (!Mesh.HasTangents) Mesh.BuildTangents();
// copy of CSkelMeshInstance::Draw sorting code
#if SORT_BY_OPACITY
// sort sections by material opacity
int SectionMap[MAX_MESHMATERIALS];
int secPlace = 0;
for (int opacity = 0; opacity < 2; opacity++)
{
for (i = 0; i < NumSections; i++)
{
UUnrealMaterial *Mat = Mesh.Sections[i].Material;
int op = 0; // sort value
if (Mat && Mat->IsTranslucent()) op = 1;
if (op == opacity) SectionMap[secPlace++] = i;
}
}
assert(secPlace == NumSections);
#endif // SORT_BY_OPACITY
// draw mesh
glEnable(GL_LIGHTING);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Position);
glNormalPointer(GL_BYTE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Normal);
if (UVIndex == 0)
{
glTexCoordPointer(2, GL_FLOAT, sizeof(CStaticMeshVertex), &Mesh.Verts[0].UV.U);
}
else
{
glTexCoordPointer(2, GL_FLOAT, sizeof(CMeshUVFloat), &Mesh.ExtraUV[UVIndex-1][0].U);
}
/*??
Can move tangent/binormal setup here too, but this will require to force shader to use fixed attribute locations
(use glBindAttribLocation before glLinkProgram instead of querying atttribute via glGetAtribLocation).
In this case:
- can remove GCurrentShader
- can eliminate hasTangent checks below and always bind attributes (when supports GL2.0)
- can share code between SkeletalMesh and StaticMesh:
- sort sections
- setup arrays; differences:
- position and normals are taken from different arrays in static and skeletal meshes
- ShowInfluences in SkeletalMeshInstance should disable material binding
- draw sections using glDrawElements()
- un-setup arrays
- use VAO+VBO for rendering
*/
for (i = 0; i < NumSections; i++)
{
#if SORT_BY_OPACITY
int MaterialIndex = SectionMap[i];
#else
int MaterialIndex = i;
#endif
const CMeshSection &Sec = Mesh.Sections[MaterialIndex];
if (!Sec.NumFaces) continue;
SetMaterial(Sec.Material, MaterialIndex);
// check tangent space
GLint aNormal = -1;
GLint aTangent = -1;
// GLint aBinormal = -1;
const CShader *Sh = GCurrentShader;
if (Sh)
{
aNormal = Sh->GetAttrib("normal");
aTangent = Sh->GetAttrib("tangent");
// aBinormal = Sh->GetAttrib("binormal");
}
if (aNormal >= 0)
{
glEnableVertexAttribArray(aNormal);
// send 4 components to decode binormal in shader
glVertexAttribPointer(aNormal, 4, GL_BYTE, GL_FALSE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Normal);
}
if (aTangent >= 0)
{
glEnableVertexAttribArray(aTangent);
glVertexAttribPointer(aTangent, 3, GL_BYTE, GL_FALSE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Tangent);
}
/* if (aBinormal >= 0)
{
glEnableVertexAttribArray(aBinormal);
glVertexAttribPointer(aBinormal, 3, GL_BYTE, GL_FALSE, sizeof(CStaticMeshVertex), &Mesh.Verts[0].Binormal);
} */
// draw
//?? place this code into CIndexBuffer?
if (Mesh.Indices.Is32Bit())
glDrawElements(GL_TRIANGLES, Sec.NumFaces * 3, GL_UNSIGNED_INT, &Mesh.Indices.Indices32[Sec.FirstIndex]);
else
glDrawElements(GL_TRIANGLES, Sec.NumFaces * 3, GL_UNSIGNED_SHORT, &Mesh.Indices.Indices16[Sec.FirstIndex]);
// disable tangents
if (aNormal >= 0)
glDisableVertexAttribArray(aNormal);
if (aTangent >= 0)
glDisableVertexAttribArray(aTangent);
// if (aBinormal >= 0)
// glDisableVertexAttribArray(aBinormal);
}
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisable(GL_LIGHTING);
BindDefaultMaterial(true);
// draw mesh normals
if (flags & DF_SHOW_NORMALS)
{
//!! TODO: performance issues when displaying a large mesh (1M+ triangles) with normals/tangents.
//!! Possible solution:
//!! 1. use vertex buffer for normals, use single draw call
//!! 2. cache normal data between render frames
//!! 3. DecodeTangents() will do Unpack() for normal and tangent too, so this work is duplicated here
int NumVerts = Mesh.NumVerts;
glBegin(GL_LINES);
glColor3f(0.5, 1, 0);
CVecT tmp, unpacked;
const float VisualLength = 2.0f;
for (i = 0; i < NumVerts; i++)
{
glVertex3fv(Mesh.Verts[i].Position.v);
Unpack(unpacked, Mesh.Verts[i].Normal);
VectorMA(Mesh.Verts[i].Position, VisualLength, unpacked, tmp);
glVertex3fv(tmp.v);
}
#if SHOW_TANGENTS
glColor3f(0, 0.5f, 1);
for (i = 0; i < NumVerts; i++)
{
const CVec3 &v = Mesh.Verts[i].Position;
glVertex3fv(v.v);
Unpack(unpacked, Mesh.Verts[i].Tangent);
VectorMA(v, VisualLength, unpacked, tmp);
glVertex3fv(tmp.v);
}
glColor3f(1, 0, 0.5f);
for (i = 0; i < NumVerts; i++)
{
const CMeshVertex& vert = Mesh.Verts[i];
// decode binormal
CVecT normal, tangent, binormal;
vert.DecodeTangents(normal, tangent, binormal);
// render
const CVecT &v = vert.Position;
glVertex3fv(v.v);
VectorMA(v, VisualLength, binormal, tmp);
glVertex3fv(tmp.v);
}
#endif // SHOW_TANGENTS
glEnd();
}
unguard;
}