public static void Set(this IAttachable attachable, int x, int y, PassBuffer passbuffer)
{
if (attachable == null || passbuffer == null || passbuffer.array == null)
{
return;
}
byte[] data = passbuffer.ConvertTo(attachable.Format);
byte[] dataStore = attachable.DataStore;
int width = attachable.Width;
int height = attachable.Height;
int singleElementByteLength = dataStore.Length / width / height;
if (singleElementByteLength != data.Length)
{
for (int i = 0; i < singleElementByteLength && i < data.Length; i++)
{
attachable.DataStore[(width * y + x) * singleElementByteLength + i] = data[i];
}
}
else
{
for (int i = 0; i < singleElementByteLength; i++)
{
attachable.DataStore[(width * y + x) * singleElementByteLength + i] = data[i];
}
}
}
private unsafe void ClipSpace2NormalDeviceSpace(PassBuffer passBuffer)
{
if (passBuffer.elementType != PassType.Vec4)
{
throw new Exception(String.Format("This pass-buffer must be of vec4 type!"));
}
var array = (vec4 *)passBuffer.Mapbuffer();
int length = passBuffer.Length();
for (int i = 0; i < length; i++)
{
vec4 gl_Position = array[i];
float w = gl_Position.w;
if (w != 0)
{
gl_Position.x = gl_Position.x / w;
gl_Position.y = gl_Position.y / w;
gl_Position.z = gl_Position.z / w;
gl_Position.w = 1;
}
array[i] = gl_Position;
}
passBuffer.Unmapbuffer();
}
/// <summary>
/// Convert data in bytes to data in specified <paramref name="internalFormat"/>.
/// </summary>
/// <param name="passbuffer">source data and its type.</param>
/// <param name="internalFormat">type of target result.</param>
/// <returns>target result.</returns>
public static byte[] ConvertTo(this PassBuffer passbuffer, uint internalFormat)
{
GCHandle pin = GCHandle.Alloc(passbuffer.array, GCHandleType.Pinned);
IntPtr address = Marshal.UnsafeAddrOfPinnedArrayElement(passbuffer.array, 0);
byte[] result = ConvertTo(address, passbuffer.elementType, internalFormat);
pin.Free();
return(result);
}
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);
}
/// <summary>
/// Find fragments in the specified triangle.
/// </summary>
/// <param name="fragCoord0"></param>
/// <param name="fragCoord1"></param>
/// <param name="fragCoord2"></param>
/// <param name="pointers"></param>
/// <param name="group"></param>
/// <param name="passBuffers"></param>
/// <param name="result"></param>
unsafe private static void FindFragmentsInTriangle(vec3 fragCoord0, vec3 fragCoord1, vec3 fragCoord2, void *[] pointers, LinearInterpolationInfoGroup group, PassBuffer[] passBuffers, List <Fragment> result)
{
int attributeCount = passBuffers.Length - 1;
var pixelList = new List <vec3>();
FindPixelsAtTriangle(fragCoord0, fragCoord1, fragCoord2, pixelList);
//OnSamePlane(fragCoord0, fragCoord1, fragCoord2, pixelList);
for (int i = 0; i < pixelList.Count; i++) // for each pixel at this line..
{
vec3 pixel = pixelList[i];
var fragment = new Fragment(pixel, attributeCount);
float p0, p1, p2;
LinearInterpolationTriangle(pixel, fragCoord0, fragCoord1, fragCoord2, out p0, out p1, out p2);
for (int t = 0; t < attributeCount; t++) // new pass-buffer objects.
{
PassType passType = passBuffers[t + 1].elementType;
fragment.attributes[t] = new PassBuffer(passType, 1); // only one element.
}
for (int attrIndex = 0; attrIndex < attributeCount; attrIndex++) // fill data in pass-buffer.
{
PassBuffer attribute = fragment.attributes[attrIndex];
void * fragmentAttribute = attribute.Mapbuffer().ToPointer();
switch (attribute.elementType)
{
case PassType.Float:
{
var fAttr = (float *)fragmentAttribute; var array = (float *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Vec2:
{
var fAttr = (vec2 *)fragmentAttribute; var array = (vec2 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Vec3:
{
var fAttr = (vec3 *)fragmentAttribute; var array = (vec3 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Vec4:
{
var fAttr = (vec4 *)fragmentAttribute; var array = (vec4 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Mat2:
{
var fAttr = (mat2 *)fragmentAttribute; var array = (mat2 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Mat3:
{
var fAttr = (mat3 *)fragmentAttribute; var array = (mat3 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
case PassType.Mat4:
{
var fAttr = (mat4 *)fragmentAttribute; var array = (mat4 *)pointers[attrIndex];
fAttr[0] = array[group.array[0].gl_VertexID] * p0 + array[group.array[1].gl_VertexID] * p1 + array[group.array[2].gl_VertexID] * p2;
} break;
default:
throw new NotDealWithNewEnumItemException(typeof(PassType));
}
attribute.Unmapbuffer();
}
result.Add(fragment);
}
}
private unsafe void FragmentShaderStage(ShaderProgram program, List <Fragment> fragmentList)
{
FragmentShader fs = program.FragmentShader; if (fs == null)
{
return;
}
foreach (var fragment in fragmentList)
{
var instance = fs.CreateCodeInstance() as FragmentCodeBase; // an executable fragment shader.
instance.gl_FragCoord = fragment.gl_FragCoord; // setup fragmen coordinatein window/screen space.
// setup "in SomeType varName;" vertex attributes.
InVariable[] inVariables = fs.inVariableDict.Values.ToArray();
if (inVariables.Length != fragment.attributes.Length)
{
throw new Exception("This should not happen!");
}
for (int index = 0; index < inVariables.Length; index++)
{
InVariable inVar = inVariables[index];
PassBuffer attribute = fragment.attributes[index];
var pointer = attribute.Mapbuffer().ToPointer();
switch (attribute.elementType)
{
case PassType.Float: inVar.fieldInfo.SetValue(instance, ((float *)pointer)[0]); break;
case PassType.Vec2: inVar.fieldInfo.SetValue(instance, ((vec2 *)pointer)[0]); break;
case PassType.Vec3: inVar.fieldInfo.SetValue(instance, ((vec3 *)pointer)[0]); break;
case PassType.Vec4: inVar.fieldInfo.SetValue(instance, ((vec4 *)pointer)[0]); break;
case PassType.Mat2: inVar.fieldInfo.SetValue(instance, ((mat2 *)pointer)[0]); break;
case PassType.Mat3: inVar.fieldInfo.SetValue(instance, ((mat3 *)pointer)[0]); break;
case PassType.Mat4: inVar.fieldInfo.SetValue(instance, ((mat4 *)pointer)[0]); break;
default: throw new NotDealWithNewEnumItemException(typeof(PassType));
}
attribute.Unmapbuffer();
}
// setup "uniform SomeType varName;" in fragment shader.
Dictionary <string, UniformValue> nameUniformDict = program.nameUniformDict;
foreach (UniformVariable uniformVar in fs.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 fragment shader code.
fragment.discard = instance.discard;
if (!instance.discard) // if this fragment is not discarded.
{
OutVariable[] outVariables = fs.outVariableDict.Values.ToArray();
var outBuffers = new PassBuffer[outVariables.Length];
for (int index = 0; index < outVariables.Length; index++)
{
OutVariable outVar = outVariables[index];
var outBuffer = new PassBuffer(outVar.fieldInfo.FieldType.GetPassType(), 1);
var pointer = outBuffer.Mapbuffer().ToPointer();
switch (outBuffer.elementType)
{
case PassType.Float: ((float *)pointer)[0] = (float)outVar.fieldInfo.GetValue(instance); break;
case PassType.Vec2: ((vec2 *)pointer)[0] = (vec2)outVar.fieldInfo.GetValue(instance); break;
case PassType.Vec3: ((vec3 *)pointer)[0] = (vec3)outVar.fieldInfo.GetValue(instance); break;
case PassType.Vec4: ((vec4 *)pointer)[0] = (vec4)outVar.fieldInfo.GetValue(instance); break;
case PassType.Mat2: ((mat2 *)pointer)[0] = (mat2)outVar.fieldInfo.GetValue(instance); break;
case PassType.Mat3: ((mat3 *)pointer)[0] = (mat3)outVar.fieldInfo.GetValue(instance); break;
case PassType.Mat4: ((mat4 *)pointer)[0] = (mat4)outVar.fieldInfo.GetValue(instance); break;
default: throw new NotDealWithNewEnumItemException(typeof(PassType));
}
outBuffer.Unmapbuffer();
outBuffers[index] = outBuffer;
}
fragment.outVariables = outBuffers;
}
}
}
private unsafe List <Fragment> LinearInterpolationPoints(int count, DrawElementsType type, IntPtr indices, VertexArrayObject vao, ShaderProgram program, GLBuffer indexBuffer, PassBuffer[] passBuffers)
{
var result = new List <Fragment>();
int attributeCount = passBuffers.Length - 1;
var gl_PositionArray = (vec4 *)passBuffers[0].Mapbuffer().ToPointer();
var pointers = new void *[passBuffers.Length - 1];
for (int i = 0; i < pointers.Length; i++)
{
pointers[i] = passBuffers[i + 1].Mapbuffer().ToPointer();
}
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>();
ivec4 viewport = this.viewport;
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);
}
vec3 fragCoord = new vec3((gl_PositionArray[gl_VertexID].x + 1) / 2.0f * viewport.z + viewport.x,
(gl_PositionArray[gl_VertexID].y + 1) / 2.0f * viewport.w + viewport.y,
(gl_PositionArray[gl_VertexID].z + 1) / 2.0f * (float)(this.depthRangeFar - this.depthRangeNear) + (float)this.depthRangeNear);
var fragment = new Fragment(fragCoord, attributeCount);
for (int i = 0; i < attributeCount; i++) // new pass-buffer objects.
{
PassType passType = passBuffers[i].elementType;
fragment.attributes[i] = new PassBuffer(passType, 1); // only one element.
}
for (int attrIndex = 0; attrIndex < attributeCount; attrIndex++) // fill data in pass-buffer.
{
PassBuffer attribute = fragment.attributes[attrIndex];
void * fragmentAttribute = attribute.Mapbuffer().ToPointer();
switch (attribute.elementType)
{
case PassType.Float:
{
var fAttr = (float *)fragmentAttribute; var array = (float *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Vec2:
{
var fAttr = (vec2 *)fragmentAttribute; var array = (vec2 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Vec3:
{
var fAttr = (vec3 *)fragmentAttribute; var array = (vec3 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Vec4:
{
var fAttr = (vec4 *)fragmentAttribute; var array = (vec4 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Mat2:
{
var fAttr = (mat2 *)fragmentAttribute; var array = (mat2 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Mat3:
{
var fAttr = (mat3 *)fragmentAttribute; var array = (mat3 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
case PassType.Mat4:
{
var fAttr = (mat4 *)fragmentAttribute; var array = (mat4 *)pointers[attrIndex];
fAttr[0] = array[gl_VertexID];
} break;
default:
throw new NotDealWithNewEnumItemException(typeof(PassType));
}
attribute.Unmapbuffer();
}
result.Add(fragment);
}
for (int i = 0; i < passBuffers.Length; i++)
{
passBuffers[i].Unmapbuffer();
}
return(result);
}
private void DrawElements(DrawTarget mode, int count, DrawElementsType type, IntPtr indices)
{
if (!Enum.IsDefined(typeof(DrawTarget), mode) || !Enum.IsDefined(typeof(DrawElementsType), type))
{
SetLastError(ErrorCode.InvalidEnum); return;
}
if (count < 0)
{
SetLastError(ErrorCode.InvalidValue); return;
}
// TODO: GL_INVALID_OPERATION is generated if a geometry shader is active and mode is incompatible with the input primitive type of the geometry shader in the currently installed program object.
// TODO: GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to an enabled array or the element array and the buffer object's data store is currently mapped.
VertexArrayObject vao = this.currentVertexArrayObject; // data structure.
if (vao == null)
{
return;
}
ShaderProgram program = this.currentShaderProgram; // algorithm.
if (program == null)
{
return;
}
GLBuffer indexBuffer = this.currentBufferDict[BindBufferTarget.ElementArrayBuffer];
if (indexBuffer == null)
{
return;
}
// execute vertex shader for each vertex!
// This is a low effetient implementation.
// passBuffers is input for the next stage: linear interpolation.
// passBuffers[0] is gl_Position.
// passBuffers[others] are attributes of vertexes.
PassBuffer[] passBuffers = VertexShaderStage(count, type, indices, vao, program, indexBuffer);
if (passBuffers == null)
{
return;
} // this stage failed.
Framebuffer framebuffer = this.currentFramebuffer;
if (framebuffer == null)
{
throw new Exception("This should not happen!");
}
ClipSpace2NormalDeviceSpace(passBuffers[0]);
// linear interpolation.
List <Fragment> fragmentList = LinearInterpolation(mode, count, type, indices, vao, program, indexBuffer, passBuffers);
// execute fargment shader for each fragment!
// This is a low effetient implementation.
FragmentShaderStage(program, fragmentList);
{
int index = 0;
while (index < fragmentList.Count)
{
if (fragmentList[index].discard)
{
fragmentList.RemoveAt(index);
}
else
{
index++;
}
}
}
// Scissor test
// Multisampel fragment operations
// Stencil test
// Depth test
DepthTest(fragmentList);
//Blending
// Dithering
// Logical operations
// write fragments to framebuffer's colorbuffer attachment(s).
{
uint[] drawBufferIndexes = framebuffer.DrawBuffers.ToArray();
foreach (var fragment in fragmentList)
{
if (fragment.depthTestFailed)
{
continue;
}
for (int i = 0; i < fragment.outVariables.Length && i < drawBufferIndexes.Length; i++)
{
PassBuffer outVar = fragment.outVariables[i];
IAttachable attachment = framebuffer.ColorbufferAttachments[drawBufferIndexes[i].ToIndex()];
attachment.Set((int)fragment.gl_FragCoord.x, (int)fragment.gl_FragCoord.y, outVar);
}
}
}
}