void replaceIncludes(string &src, string &dest, const string &directive,
string &alreadyIncluded, bool onlyOnce)
{
int start = 0;
while (true) {
int includeIndex = (int)src.find("#include", start);
if (includeIndex < 0) {
dest += src.substr(start);
break;
}
if (includeIndex > 0 && !isspace(src[includeIndex - 1])) continue;
dest += src.substr(start, includeIndex - 1);
//
int quoteStart = (int)src.find("\"", start + 8);
int quoteEnd = (int)src.find("\"", quoteStart + 1);
start = quoteEnd + 1;
if (quoteStart >= quoteEnd) {
ERROR_MSG("could not replace includes");
break;
}
string includeFileName = src.substr(quoteStart + 1, (quoteEnd - quoteStart - 1));
if ((int)alreadyIncluded.find(includeFileName) < 0) {
if (onlyOnce) {
alreadyIncluded.append("|");
alreadyIncluded.append(includeFileName);
}
string subSource;
loadFileAsString(includeFileName, subSource);
replaceIncludes(subSource, dest, directive, alreadyIncluded, onlyOnce);
}
}
}
GLuint loadShader(const string &fileName, GLuint shaderType)
{
// load the shader as a file
string mainCode;
if (!loadFileAsString(fileName, mainCode)) {
ERROR_MSG("Could not load file '" + fileName + "'", false);
return NULL_HANDLE;
}
string shaderCode;
string alreadyIncluded = fileName;
replaceIncludes(mainCode, shaderCode, "#include", alreadyIncluded, true);
// print the shader code
#ifdef _DEBUG
//cout << "\n----------------------------------------------- SHADER CODE:\n";
//cout << shaderCode << endl;
//cout << "--------------------------------------------------------------\n";
#endif
// transfer shader code to card and compile
GLuint shaderHandle = glCreateShader(shaderType); // create handle for the shader
const char* source = shaderCode.c_str(); // get C style string for shader code
glShaderSource(shaderHandle, 1, &source, NULL); // pass the shader code to the card
glCompileShader(shaderHandle); // attempt to compile the shader
// check to see if compilation worked
// If the compilation did not work, print an error message and return NULL handle
int status;
glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
ERROR_MSG("compiling shader '" + fileName + "'", false);
GLint msgLength = 0;
glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &msgLength);
std::vector<char> msg(msgLength);
glGetShaderInfoLog(shaderHandle, msgLength, &msgLength, &msg[0]);
printf("%s\n", &msg[0]);
glDeleteShader(shaderHandle);
exit(0);
return NULL_HANDLE;
}
return shaderHandle;
}
Effect* Effect::createFromSource(const char* vshPath, const char* vshSource, const char* fshPath, const char* fshSource, const char* defines)
{
GP_ASSERT(vshSource);
GP_ASSERT(fshSource);
const unsigned int SHADER_SOURCE_LENGTH = 3;
const GLchar* shaderSource[SHADER_SOURCE_LENGTH];
char* infoLog = NULL;
GLuint vertexShader;
GLuint fragmentShader;
GLuint program;
GLint length;
GLint success;
// Replace all comma separated definitions with #define prefix and \n suffix
std::string definesStr = "";
replaceDefines(defines, definesStr);
shaderSource[0] = definesStr.c_str();
shaderSource[1] = "\n";
std::string vshSourceStr = "";
if (vshPath)
{
// Replace the #include "xxxxx.xxx" with the sources that come from file paths
replaceIncludes(vshPath, vshSource, vshSourceStr);
if (vshSource && strlen(vshSource) != 0)
vshSourceStr += "\n";
}
shaderSource[2] = vshPath ? vshSourceStr.c_str() : vshSource;
GL_ASSERT( vertexShader = glCreateShader(GL_VERTEX_SHADER) );
GL_ASSERT( glShaderSource(vertexShader, SHADER_SOURCE_LENGTH, shaderSource, NULL) );
GL_ASSERT( glCompileShader(vertexShader) );
GL_ASSERT( glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success) );
if (success != GL_TRUE)
{
GL_ASSERT( glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &length) );
if (length == 0)
{
length = 4096;
}
if (length > 0)
{
infoLog = new char[length];
GL_ASSERT( glGetShaderInfoLog(vertexShader, length, NULL, infoLog) );
infoLog[length-1] = '\0';
}
// Write out the expanded shader file.
if (vshPath)
writeShaderToErrorFile(vshPath, shaderSource[2]);
GP_ERROR("Compile failed for vertex shader '%s' with error '%s'.", vshPath == NULL ? vshSource : vshPath, infoLog == NULL ? "" : infoLog);
SAFE_DELETE_ARRAY(infoLog);
// Clean up.
GL_ASSERT( glDeleteShader(vertexShader) );
return NULL;
}
// Compile the fragment shader.
std::string fshSourceStr;
if (fshPath)
{
// Replace the #include "xxxxx.xxx" with the sources that come from file paths
replaceIncludes(fshPath, fshSource, fshSourceStr);
if (fshSource && strlen(fshSource) != 0)
fshSourceStr += "\n";
}
shaderSource[2] = fshPath ? fshSourceStr.c_str() : fshSource;
GL_ASSERT( fragmentShader = glCreateShader(GL_FRAGMENT_SHADER) );
GL_ASSERT( glShaderSource(fragmentShader, SHADER_SOURCE_LENGTH, shaderSource, NULL) );
GL_ASSERT( glCompileShader(fragmentShader) );
GL_ASSERT( glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success) );
if (success != GL_TRUE)
{
GL_ASSERT( glGetShaderiv(fragmentShader, GL_INFO_LOG_LENGTH, &length) );
if (length == 0)
{
length = 4096;
}
if (length > 0)
{
infoLog = new char[length];
GL_ASSERT( glGetShaderInfoLog(fragmentShader, length, NULL, infoLog) );
infoLog[length-1] = '\0';
}
// Write out the expanded shader file.
if (fshPath)
writeShaderToErrorFile(fshPath, shaderSource[2]);
GP_ERROR("Compile failed for fragment shader (%s): %s", fshPath == NULL ? fshSource : fshPath, infoLog == NULL ? "" : infoLog);
SAFE_DELETE_ARRAY(infoLog);
// Clean up.
GL_ASSERT( glDeleteShader(vertexShader) );
GL_ASSERT( glDeleteShader(fragmentShader) );
return NULL;
}
// Link program.
GL_ASSERT( program = glCreateProgram() );
GL_ASSERT( glAttachShader(program, vertexShader) );
GL_ASSERT( glAttachShader(program, fragmentShader) );
GL_ASSERT( glLinkProgram(program) );
GL_ASSERT( glGetProgramiv(program, GL_LINK_STATUS, &success) );
// Delete shaders after linking.
GL_ASSERT( glDeleteShader(vertexShader) );
GL_ASSERT( glDeleteShader(fragmentShader) );
// Check link status.
if (success != GL_TRUE)
{
GL_ASSERT( glGetProgramiv(program, GL_INFO_LOG_LENGTH, &length) );
if (length == 0)
{
length = 4096;
}
if (length > 0)
{
infoLog = new char[length];
GL_ASSERT( glGetProgramInfoLog(program, length, NULL, infoLog) );
infoLog[length-1] = '\0';
}
GP_ERROR("Linking program failed (%s,%s): %s", vshPath == NULL ? "NULL" : vshPath, fshPath == NULL ? "NULL" : fshPath, infoLog == NULL ? "" : infoLog);
SAFE_DELETE_ARRAY(infoLog);
// Clean up.
GL_ASSERT( glDeleteProgram(program) );
return NULL;
}
// Create and return the new Effect.
Effect* effect = new Effect();
effect->_program = program;
// Query and store vertex attribute meta-data from the program.
// NOTE: Rather than using glBindAttribLocation to explicitly specify our own
// preferred attribute locations, we're going to query the locations that were
// automatically bound by the GPU. While it can sometimes be convenient to use
// glBindAttribLocation, some vendors actually reserve certain attribute indices
// and therefore using this function can create compatibility issues between
// different hardware vendors.
GLint activeAttributes;
GL_ASSERT( glGetProgramiv(program, GL_ACTIVE_ATTRIBUTES, &activeAttributes) );
if (activeAttributes > 0)
{
GL_ASSERT( glGetProgramiv(program, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &length) );
if (length > 0)
{
GLchar* attribName = new GLchar[length + 1];
GLint attribSize;
GLenum attribType;
GLint attribLocation;
for (int i = 0; i < activeAttributes; ++i)
{
// Query attribute info.
GL_ASSERT( glGetActiveAttrib(program, i, length, NULL, &attribSize, &attribType, attribName) );
attribName[length] = '\0';
// Query the pre-assigned attribute location.
GL_ASSERT( attribLocation = glGetAttribLocation(program, attribName) );
// Assign the vertex attribute mapping for the effect.
effect->_vertexAttributes[attribName] = attribLocation;
}
SAFE_DELETE_ARRAY(attribName);
}
}
// Query and store uniforms from the program.
GLint activeUniforms;
GL_ASSERT( glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &activeUniforms) );
if (activeUniforms > 0)
{
GL_ASSERT( glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &length) );
if (length > 0)
{
GLchar* uniformName = new GLchar[length + 1];
GLint uniformSize;
GLenum uniformType;
GLint uniformLocation;
unsigned int samplerIndex = 0;
for (int i = 0; i < activeUniforms; ++i)
{
// Query uniform info.
GL_ASSERT( glGetActiveUniform(program, i, length, NULL, &uniformSize, &uniformType, uniformName) );
uniformName[length] = '\0'; // null terminate
if (length > 3)
{
// If this is an array uniform, strip array indexers off it since GL does not
// seem to be consistent across different drivers/implementations in how it returns
// array uniforms. On some systems it will return "u_matrixArray", while on others
// it will return "u_matrixArray[0]".
char* c = strrchr(uniformName, '[');
if (c)
{
*c = '\0';
}
}
// Query the pre-assigned uniform location.
GL_ASSERT( uniformLocation = glGetUniformLocation(program, uniformName) );
Uniform* uniform = new Uniform();
uniform->_effect = effect;
uniform->_name = uniformName;
uniform->_location = uniformLocation;
uniform->_type = uniformType;
if (uniformType == GL_SAMPLER_2D)
{
uniform->_index = samplerIndex;
samplerIndex += uniformSize;
}
else
{
uniform->_index = 0;
}
effect->_uniforms[uniformName] = uniform;
}
SAFE_DELETE_ARRAY(uniformName);
}
}
return effect;
}
static void replaceIncludes(const char* filepath, const char* source, std::string& out)
{
// Replace the #include "xxxx.xxx" with the sourced file contents of "filepath/xxxx.xxx"
std::string str = source;
size_t lastPos = 0;
size_t headPos = 0;
size_t fileLen = str.length();
size_t tailPos = fileLen;
while (headPos < fileLen)
{
lastPos = headPos;
if (headPos == 0)
{
// find the first "#include"
headPos = str.find("#include");
}
else
{
// find the next "#include"
headPos = str.find("#include", headPos + 1);
}
// If "#include" is found
if (headPos != std::string::npos)
{
// append from our last position for the legth (head - last position)
out.append(str.substr(lastPos, headPos - lastPos));
// find the start quote "
size_t startQuote = str.find("\"", headPos) + 1;
if (startQuote == std::string::npos)
{
// We have started an "#include" but missing the leading quote "
GP_ERROR("Compile failed for shader '%s' missing leading \".", filepath);
return;
}
// find the end quote "
size_t endQuote = str.find("\"", startQuote);
if (endQuote == std::string::npos)
{
// We have a start quote but missing the trailing quote "
GP_ERROR("Compile failed for shader '%s' missing trailing \".", filepath);
return;
}
// jump the head position past the end quote
headPos = endQuote + 1;
// File path to include and 'stitch' in the value in the quotes to the file path and source it.
std::string filepathStr = filepath;
std::string directoryPath = filepathStr.substr(0, filepathStr.rfind('/') + 1);
size_t len = endQuote - (startQuote);
std::string includeStr = str.substr(startQuote, len);
directoryPath.append(includeStr);
const char* includedSource = FileSystem::readAll(directoryPath.c_str());
if (includedSource == NULL)
{
GP_ERROR("Compile failed for shader '%s' invalid filepath.", filepathStr.c_str());
return;
}
else
{
// Valid file so lets attempt to see if we need to append anything to it too (recurse...)
replaceIncludes(directoryPath.c_str(), includedSource, out);
SAFE_DELETE_ARRAY(includedSource);
}
}
else
{
// Append the remaining
out.append(str.c_str(), lastPos, tailPos);
}
}
}
