std::string NodeOverlay::Shader::fragment_shader_source (const Displayable& object)
{
assert (object.colourmap == 5);
std::string source = object.declare_shader_variables () +
"uniform sampler3D tex;\n"
"in vec3 texcoord;\n"
"out vec4 color;\n"
"void main() {\n"
" if (texcoord.s < 0.0 || texcoord.s > 1.0 ||\n"
" texcoord.t < 0.0 || texcoord.t > 1.0 ||\n"
" texcoord.p < 0.0 || texcoord.p > 1.0) discard;\n"
" color = texture (tex, texcoord.stp);\n"
" color.a = color.a * alpha;\n";
source += " " + std::string (ColourMap::maps[object.colourmap].glsl_mapping);
source += "}\n";
return source;
}
std::string Slice::Shader::fragment_shader_source (const Displayable& object)
{
std::string source = object.declare_shader_variables () +
"uniform sampler3D tex;\n"
"in vec3 texcoord;\n"
"out vec4 color;\n";
source +=
"void main() {\n"
" if (texcoord.s < 0.0 || texcoord.s > 1.0 ||\n"
" texcoord.t < 0.0 || texcoord.t > 1.0 ||\n"
" texcoord.p < 0.0 || texcoord.p > 1.0) discard;\n"
" color = texture (tex, texcoord.stp);\n"
" float amplitude = " + std::string (ColourMap::maps[object.colourmap].amplitude) + ";\n"
" if (isnan(amplitude) || isinf(amplitude)) discard;\n";
if (object.use_discard_lower())
source += " if (amplitude < lower) discard;\n";
if (object.use_discard_upper())
source += " if (amplitude > upper) discard;\n";
if (object.use_transparency())
source += " if (amplitude < alpha_offset) discard;\n"
" color.a = clamp ((amplitude - alpha_offset) * alpha_scale, 0, alpha);\n";
if (!ColourMap::maps[object.colourmap].special) {
source += " amplitude = clamp (";
if (object.scale_inverted())
source += "1.0 -";
source += " scale * (amplitude - offset), 0.0, 1.0);\n ";
}
source += ColourMap::maps[object.colourmap].glsl_mapping;
source += "}\n";
return source;
}