void sendDataToGL()
{
std::vector<float> lut;
int lutSize = mTable->GetNumberOfTuples();
int lutDataSize = lutSize * mTable->GetNumberOfComponents();
lut.resize(lutDataSize);
unsigned char* ptr = mTable->GetPointer(0);
for (int i = 0; i < lut.size(); ++i)
{
lut[i] = ((float) *ptr) / 255.0;
++ptr;
}
glBindTexture(GL_TEXTURE_1D, textureId);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
report_gl_error();
glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA,
lutSize, 0,
GL_RGBA, GL_FLOAT, &(*lut.begin()));
report_gl_error();
}
void ShaderCallback::addUniformfArray(vtkShaderProgram *program, std::string name, float value)
{
//Note: Set uniform will fail if the uniform is not present OR active (used inside the program).
report_gl_error();
//CX_LOG_DEBUG() << "Adding uniform called: " << name << " with value " << value;
if(!program->SetUniform1fv(name.c_str(), 1, &value))
{
CX_LOG_ERROR() << "Could not set uniform named " << name;
}
report_gl_error();
}
void ShaderCallback::test( unsigned long event, void *cbo)
{
std::cout << " START TEST" << std::endl;
if(event == vtkCommand::UpdateShaderEvent)
{
std::cout << "--- START UpdateShaderEvent" << std::endl;
vtkOpenGLHelper *cellBO = reinterpret_cast<vtkOpenGLHelper*>(cbo);
report_gl_error();
if(cellBO && cellBO->VAO)
{
report_gl_error();
vtkShaderProgram *program = cellBO->Program;
vtkOpenGLVertexArrayObject *vao = cellBO->VAO;
std::cout << "Program is compiled? " << program->GetCompiled() << std::endl;
std::cout << "Program is bound? " << program->isBound() << std::endl;
std::cout << "IBO index count " << cellBO->IBO->IndexCount << std::endl;
report_gl_error();
GLint color_frag_out_index = glGetFragDataLocation(cellBO->Program->GetHandle(), "color");
std::cout << "color index " << color_frag_out_index << std::endl;
glBindFragDataLocation(cellBO->Program->GetHandle(), color_frag_out_index, "color"); //setting output of fragment shader
std::cout << "ADDING ATTRIBUTE ARRAY" << std::endl;
/*
vao->Bind();
if (!vao->AddAttributeArray(program, vbo.Get(), "vertexMC", 0, sizeof(float)*3, VTK_FLOAT, 3, false))
{
vtkGenericWarningMacro(<< "Error setting 'vertexMC' in shader VAO.");
}
*/
vao->Bind();
//Input color
int vec_size = 3;
if (!vao->AddAttributeArray(
program, //vtkShaderProgram
mColorBufferObject.Get(), //vtkOpenGLBufferObject
"COLOR_VSIN", //std::string
0, //int (offset) where to start reading g_color_buffer_data, offset != 0 == discard some of the first values
sizeof(float)*3, //size_t (stride) If stride is 0, the generic vertex attributes are understood to be tightly packed in the array.
VTK_FLOAT, //int (elementType) Specifies the data type of each component in the array
vec_size, //int (elementTupleSize) Specifies the number of components per generic vertex attribute. Must be 1, 2, 3, 4.
false //bool (normalize)
))
{
vtkGenericWarningMacro(<< "Error setting 'COLOR' in shader VAO.");
}
virtual void bind(int textureUnitIndex)
{
this->updateTexture();
if (!mAllocated)
{
std::cout << "error: called bind() on unallocated lut buffer" << std::endl;
return;
}
glActiveTexture(getGLTextureForLut(textureUnitIndex));
this->bindDataToGL();
report_gl_error();
}
virtual void updateTexture()
{
if (mMTime == mTable->GetMTime())
{
return;
}
mMTime = mTable->GetMTime();
glActiveTexture(GL_TEXTURE6);
this->sendDataToGL();
report_gl_error();
}
/**Activate and bind the volume and lut buffers inside the texture units
* GL_TEXTURE<2X> and GL_TEXTURE<2X+1>.
* Use during RenderInternal()
*/
virtual void bind(int textureUnitIndex)
{
this->updateTexture();
if (!mAllocated)
{
std::cout << "error: called bind() on unallocated volume buffer" << std::endl;
return;
}
glActiveTexture(getGLTextureForVolume(textureUnitIndex));
glBindTexture(GL_TEXTURE_3D, textureId);
report_gl_error();
}
/**
* @brief ShaderCallback::addArrayToAttributeArray
* In the vertex shader there is an in array of vec3 which will contain texture coordinates per uploaded texture. This function populates this array.
* @param program The shader program to work with.
* @param buffer The buffer containing the texture coordinates.
* @param name The name of the array variable in the vertex shader which will point to the texture coordinates.
* @param vector_index The place in the
*/
void ShaderCallback::addArrayToAttributeArray(vtkShaderProgram *program, vtkOpenGLBufferObjectPtr buffer, std::string name, int vector_index)
{
//--------
//This is information about how the texture coordinates are uploaded.
int offset = 0;
int vec_size = 3;
size_t stride = sizeof(float)*vec_size; //is this correct? was *3;
int elementType = GL_FLOAT; //VTK_FLOAT
bool normalize = false;
//CX_LOG_DEBUG() << "Adding attribute called: " << name << " to vector_index: " << vector_index;
//--------
const GLchar *namePtr = static_cast<const GLchar *>(name.c_str());
GLint start_of_vector_index = glGetAttribLocation(program->GetHandle(), namePtr);
report_gl_error();
if(start_of_vector_index != -1)
{
GLint position_in_vector_index = start_of_vector_index + vector_index;
buffer->Bind();
glEnableVertexAttribArray(position_in_vector_index);
glVertexAttribPointer(position_in_vector_index,
vec_size,
elementType,
normalize,
static_cast<GLsizei>(stride),
((char *)NULL + (offset))
);
report_gl_error();
}
else
{
CX_LOG_ERROR() << "Error setting attribute " << name << " with vector_index " << vector_index;
}
}
/**
* @name core_check_gl_error
* @brief check's for a gl error and reports it to the platform
* @retval NONE
*/
void core_check_gl_error() {
// check the gl error and send it to java to be logged
int error_code = glGetError();
if (error_code != 0) {
LOG("{core} WARNING: OpenGL error %d", error_code);
//check if we should report the error, return early if not.
if (error_code == GL_ERROR_OUT_OF_MEMORY) {
//does not matter if it is already in the hash, report as unrecoverable and respond
report_gl_error(error_code, &gl_errors_hash, true);
//use halfsized textures for lower memory footprint
set_halfsized_textures(true);
} else {
//check if error is in the hash, if it is, leave
gl_error *error = NULL;
HASH_FIND_INT(gl_errors_hash, &error_code, error);
if (!error) {
report_gl_error(error_code, &gl_errors_hash, false);
}
}
}
}
void ShaderCallback::printDebugInfo(vtkOpenGLHelper *OpenGLHelper)
{
if(!OpenGLHelper)
{
return;
}
vtkShaderProgram *program = OpenGLHelper->Program;
std::cout << "Program is compiled? " << program->GetCompiled() << std::endl;
std::cout << "Program is bound? " << program->isBound() << std::endl;
std::cout << "IBO index count " << OpenGLHelper->IBO->IndexCount << std::endl;
std::string vertexshader = program->GetVertexShader()->GetSource();
std::cout << "Vertexshader:\n " << vertexshader << std::endl;
std::string fragmentshader = program->GetFragmentShader()->GetSource();
std::cout << "Fragmentshader:\n " << fragmentshader << std::endl;
report_gl_error();
}
void ShaderCallback::Execute(vtkObject *, unsigned long eventId, void *cbo)
{
report_gl_error();
vtkOpenGLHelper *OpenGLHelper = reinterpret_cast<vtkOpenGLHelper*>(cbo);
if(!OpenGLHelper || !OpenGLHelper->VAO || !OpenGLHelper->Program)
{
return;
}
if(eventId == vtkCommand::UpdateShaderEvent)
{
report_gl_error();
int textures_to_add = this->getNumberOfUploadedTextures();
//Bind fragmentshader output variable
// (glsl: vec4)
if(textures_to_add != 0)
{
this->bindFSOutputVariable(OpenGLHelper->Program);
}
report_gl_error();
//Bind VAO (Vertext Array Object - aka saved input to the vertex shader)
OpenGLHelper->VAO->Bind();
report_gl_error();
for(int i=0; i< textures_to_add; ++i)
{
ShaderItemPtr shaderItem = mShaderItems.at(i);
// texture coordinates (glsl: vec3)
vtkOpenGLBufferObjectPtr texture_coordinates = shaderItem->mTextureCoordinates;
if(texture_coordinates)
{
if(!texture_coordinates->Bind())
{
CX_LOG_WARNING() << "Could not bind texture coordinates";
}
this->addArrayToAttributeArray(OpenGLHelper->Program, texture_coordinates, VS_In_Vec3_TextureCoordinate, i);
}
else
{
CX_LOG_WARNING() << "NO TEXTURE COORDINATES!";
}
report_gl_error();
// 3D texture pointer (glsl: sampler3D)
vtkTextureObjectPtr texture = shaderItem->mTexture;
if(texture)
{
texture->Activate();
this->addUniformiArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_3DTexture_Volume, i), texture->GetTextureUnit());
}
else
{
CX_LOG_WARNING() << "NO 3D TEXTURE!";
}
report_gl_error();
// 1D texture pointer (glsl: sampler1D)
vtkTextureObjectPtr lut = shaderItem->mLUT;
if(lut)
{
lut->Activate();
this->addUniformiArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_1DTexture_LUT, i), lut->GetTextureUnit());
}
else
{
CX_LOG_WARNING() << "NO 1D TEXTURE!";
}
report_gl_error();
this->addUniformfArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_Window,i), shaderItem->mWindow);
this->addUniformfArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_Level,i), shaderItem->mLevel);
this->addUniformfArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_LLR,i), shaderItem->mLLR);
this->addUniformfArray(OpenGLHelper->Program, getVectorNameFromName(FS_Uniform_Alpha,i), shaderItem->mAlpha);
}
}
report_gl_error();
}
virtual void updateTexture()
{
if (mMTime == mTexture->GetMTime())
{
return;
}
mMTime = mTexture->GetMTime();
//vtkgl::ActiveTexture(getGLTextureForVolume(textureUnitIndex)); //TODO is this OK?
GLenum size,internalType;
boost::uint32_t dimx = mTexture ->GetDimensions( )[0];
boost::uint32_t dimy = mTexture ->GetDimensions( )[1];
boost::uint32_t dimz = mTexture ->GetDimensions( )[2];
mMemorySize = dimx * dimy * dimz;
glEnable( GL_TEXTURE_3D );
glBindTexture(GL_TEXTURE_3D, textureId);
report_gl_error();
glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP );
glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP );
glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP );
glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
switch (mTexture->GetScalarType())
{
case VTK_UNSIGNED_CHAR:
{
size = GL_UNSIGNED_BYTE;
internalType = GL_LUMINANCE;
}
break; //8UI_EXT; break;
case VTK_UNSIGNED_SHORT:
{
size = GL_UNSIGNED_SHORT;
internalType = GL_LUMINANCE16;
mMemorySize *= 2;
}
break; //16UI_EXT; break;
default:
size = 0;
internalType = 0;
std::cout << "Bit size not supported!" << std::endl;
QString dataType(mTexture->GetScalarTypeAsString());
CX_LOG_ERROR() << QString("Attempt to update 3D GL texture from type %1 failed. Only unsigned types supported").arg(dataType);
break;
}
if (mTexture->GetNumberOfScalarComponents()==1)
{
void* data = mTexture->GetPointData()->GetScalars()->GetVoidPointer(0);
glTexImage3D(GL_TEXTURE_3D, 0, internalType, dimx, dimy, dimz, 0, GL_LUMINANCE, size, data);
}
else if (mTexture->GetNumberOfScalarComponents()==3)
{
internalType = GL_RGB;
void* data = mTexture->GetPointData()->GetScalars()->GetVoidPointer(0);
glTexImage3D(GL_TEXTURE_3D, 0, internalType, dimx, dimy, dimz, 0, GL_RGB, size, data);
mMemorySize *= 3;
}
else
{
std::cout << "unsupported number of image components" << std::endl;
}
glDisable(GL_TEXTURE_3D);
report_gl_error();
}