private void DisableVertexAttribArray(uint index)
{
// TODO: GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.
VertexArrayObject vao = this.currentVertexArrayObject;
if (vao == null)
{
SetLastError(ErrorCode.InvalidOperation); return;
}
VertexAttribDesc desc = null;
if (vao.LocVertexAttribDict.TryGetValue(index, out desc))
{
desc.enabled = false;
}
}
private void VertexAttribLPointer(uint index, int size, VertexAttribLType type, int stride, IntPtr pointer)
{
// TODO: GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.
if (size != 1 && size != 2 && size != 3 && size != 4)
{
SetLastError(ErrorCode.InvalidValue); return;
}
if (!Enum.IsDefined(typeof(VertexAttribLType), type))
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if (stride < 0)
{
SetLastError(ErrorCode.InvalidValue); return;
}
VertexArrayObject vao = this.currentVertexArrayObject;
if (vao == null)
{
SetLastError(ErrorCode.InvalidOperation); return;
}
GLBuffer buffer = this.currentBufferDict[BindBufferTarget.ArrayBuffer];
// GL_INVALID_OPERATION is generated if zero is bound to the GL_ARRAY_BUFFER buffer object binding point and the pointer argument is not NULL.
// TODO: why only when "pointer argument is not NULL"?
if (buffer == null)
{
SetLastError(ErrorCode.InvalidOperation); return;
}
VertexAttribDesc desc = null;
if (!vao.LocVertexAttribDict.TryGetValue(index, out desc))
{
desc = new VertexAttribDesc();
vao.LocVertexAttribDict.Add(index, desc);
}
desc.inLocation = index;
desc.vbo = buffer;
desc.dataSize = size;
desc.dataType = (uint)type;
//desc.normalize = false; // not needed.
desc.startPos = (uint)pointer.ToInt32();
desc.stride = (uint)stride;
}
private unsafe PassBuffer[] VertexShaderStage(int count, DrawElementsType type, IntPtr indices, VertexArrayObject vao, ShaderProgram program, GLBuffer indexBuffer)
{
PassBuffer[] passBuffers = null;
VertexShader vs = program.VertexShader; if (vs == null)
{
return(passBuffers);
}
// init pass-buffers to record output from vertex shader.
FieldInfo[] outFieldInfos = (from item in vs.outVariableDict select item.Value.fieldInfo).ToArray();
uint vertexCount = GetVertexCount(vao, indexBuffer, type);
//int vertexSize = GetVertexSize(outFieldInfos);
passBuffers = new PassBuffer[1 + outFieldInfos.Length];
void *[] pointers = new void *[1 + outFieldInfos.Length];
{
// the first pass-buffer stores gl_Position.
var passBuffer = new PassBuffer(PassType.Vec4, (int)vertexCount);
pointers[0] = (void *)passBuffer.Mapbuffer();
passBuffers[0] = passBuffer;
}
for (int i = 1; i < passBuffers.Length; i++)
{
var outField = outFieldInfos[i - 1];
PassType passType = outField.FieldType.GetPassType();
var passBuffer = new PassBuffer(passType, (int)vertexCount);
pointers[i] = (void *)passBuffer.Mapbuffer();
passBuffers[i] = passBuffer;
}
// execute vertex shader for each vertex.
byte[] indexData = indexBuffer.Data;
int indexLength = indexData.Length / ByteLength(type);
GCHandle pin = GCHandle.Alloc(indexData, GCHandleType.Pinned);
IntPtr pointer = pin.AddrOfPinnedObject();
var gl_VertexIDList = new List <uint>();
for (int indexID = indices.ToInt32() / ByteLength(type), c = 0; c < count && indexID < indexLength; indexID++, c++)
{
uint gl_VertexID = GetVertexID(pointer, type, indexID);
if (gl_VertexIDList.Contains(gl_VertexID))
{
continue;
}
else
{
gl_VertexIDList.Add(gl_VertexID);
}
var instance = vs.CreateCodeInstance() as VertexCodeBase; // an executable vertex shader.
instance.gl_VertexID = (int)gl_VertexID; // setup gl_VertexID.
// setup "in SomeType varName;" vertex attributes.
Dictionary <uint, VertexAttribDesc> locVertexAttribDict = vao.LocVertexAttribDict;
foreach (InVariable inVar in vs.inVariableDict.Values) // Dictionary<string, InVariable>.Values
{
VertexAttribDesc desc = null;
if (locVertexAttribDict.TryGetValue(inVar.location, out desc))
{
byte[] dataStore = desc.vbo.Data;
int byteIndex = desc.GetDataIndex(gl_VertexID);
VertexAttribType vertexAttribType = (VertexAttribType)desc.dataType;
object value = dataStore.ToStruct(inVar.fieldInfo.FieldType, byteIndex);
inVar.fieldInfo.SetValue(instance, value);
}
}
// setup "uniform SomeType varName;" in vertex shader.
Dictionary <string, UniformValue> nameUniformDict = program.nameUniformDict;
foreach (UniformVariable uniformVar in vs.UniformVariableDict.Values)
{
string name = uniformVar.fieldInfo.Name;
UniformValue obj = null;
if (nameUniformDict.TryGetValue(name, out obj))
{
if (obj.value != null)
{
uniformVar.fieldInfo.SetValue(instance, obj.value);
}
}
}
instance.main(); // execute vertex shader code.
// copy data to pass-buffer.
{
PassBuffer passBuffer = passBuffers[0];
var array = (vec4 *)pointers[0];
array[gl_VertexID] = instance.gl_Position;
}
for (int i = 1; i < passBuffers.Length; i++)
{
var outField = outFieldInfos[i - 1];
var obj = outField.GetValue(instance);
switch (outField.FieldType.GetPassType())
{
case PassType.Float: { var array = (float *)pointers[i]; array[gl_VertexID] = (float)obj; } break;
case PassType.Vec2: { var array = (vec2 *)pointers[i]; array[gl_VertexID] = (vec2)obj; } break;
case PassType.Vec3: { var array = (vec3 *)pointers[i]; array[gl_VertexID] = (vec3)obj; } break;
case PassType.Vec4: { var array = (vec4 *)pointers[i]; array[gl_VertexID] = (vec4)obj; } break;
case PassType.Mat2: { var array = (mat2 *)pointers[i]; array[gl_VertexID] = (mat2)obj; } break;
case PassType.Mat3: { var array = (mat3 *)pointers[i]; array[gl_VertexID] = (mat3)obj; } break;
case PassType.Mat4: { var array = (mat4 *)pointers[i]; array[gl_VertexID] = (mat4)obj; } break;
default:
throw new NotImplementedException();
}
// a general way to do this:
//var obj = outField.GetValue(instance);
//byte[] bytes = obj.ToBytes();
//PassBuffer passBuffer = passBuffers[i];
//var array = (byte*)passBuffer.AddrOfPinnedObject();
//for (int t = 0; t < bytes.Length; t++)
//{
// array[gl_VertexID * vertexSize + t] = bytes[t];
//}
}
}
pin.Free();
for (int i = 0; i < passBuffers.Length; i++)
{
passBuffers[i].Unmapbuffer();
}
return(passBuffers);
}
