/////////////////////////////////////////////////////////////////
// Load a pair of shaders, compile, and link together. Specify the complete
// file path for each shader. Note, there is no support for
// just loading say a vertex program... you have to do both.
GLuint gltLoadShaderPair(const char *szVertexProg, const char *szFragmentProg)
{
// Temporary Shader objects
GLuint hVertexShader;
GLuint hFragmentShader;
GLuint hReturn = 0;
GLint testVal;
// Create shader objects
hVertexShader = glCreateShader(GL_VERTEX_SHADER);
hFragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
// Load them. If fail clean up and return null
if(gltLoadShaderFile(szVertexProg, hVertexShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
if(gltLoadShaderFile(szFragmentProg, hFragmentShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
// Compile them
glCompileShader(hVertexShader);
glCompileShader(hFragmentShader);
// Check for errors
glGetShaderiv(hVertexShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
glGetShaderiv(hFragmentShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
// Link them - assuming it works...
hReturn = glCreateProgram();
glAttachShader(hReturn, hVertexShader);
glAttachShader(hReturn, hFragmentShader);
glLinkProgram(hReturn);
// These are no longer needed
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
// Make sure link worked too
glGetProgramiv(hReturn, GL_LINK_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteProgram(hReturn);
return (GLuint)NULL;
}
return hReturn;
}
///////////////////////////////////////////////////////////////////////////////////////////////
// Load the shader file, with the supplied named attributes
GLuint GLShaderManager::LoadShaderPairWithAttributes(const char *szVertexProgFileName, const char *szFragmentProgFileName, ...)
{
// Check for duplicate
GLuint uiShader = LookupShader(szVertexProgFileName, szFragmentProgFileName);
if(uiShader != 0)
return uiShader;
SHADERLOOKUPETRY shaderEntry;
// Temporary Shader objects
GLuint hVertexShader;
GLuint hFragmentShader;
GLint testVal;
// Create shader objects
hVertexShader = glCreateShader(GL_VERTEX_SHADER);
hFragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
// Load them. If fail clean up and return null
if(gltLoadShaderFile(szVertexProgFileName, hVertexShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return 0;
}
if(gltLoadShaderFile(szFragmentProgFileName, hFragmentShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return 0;
}
// Compile them
glCompileShader(hVertexShader);
glCompileShader(hFragmentShader);
// Check for errors
glGetShaderiv(hVertexShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return 0;
}
glGetShaderiv(hFragmentShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return 0;
}
// Link them - assuming it works...
shaderEntry.uiShaderID = glCreateProgram();
glAttachShader(shaderEntry.uiShaderID, hVertexShader);
glAttachShader(shaderEntry.uiShaderID, hFragmentShader);
// List of attributes
va_list attributeList;
va_start(attributeList, szFragmentProgFileName);
char *szNextArg;
int iArgCount = va_arg(attributeList, int); // Number of attributes
for(int i = 0; i < iArgCount; i++)
{
int index = va_arg(attributeList, int);
szNextArg = va_arg(attributeList, char*);
glBindAttribLocation(shaderEntry.uiShaderID, index, szNextArg);
}
va_end(attributeList);
glLinkProgram(shaderEntry.uiShaderID);
// These are no longer needed
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
// Make sure link worked too
glGetProgramiv(shaderEntry.uiShaderID, GL_LINK_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteProgram(shaderEntry.uiShaderID);
return 0;
}
// Add it...
strncpy_s(shaderEntry.szVertexShaderName, MAX_SHADER_NAME_LENGTH, szVertexProgFileName, MAX_SHADER_NAME_LENGTH);
strncpy_s(shaderEntry.szFragShaderName, MAX_SHADER_NAME_LENGTH, szFragmentProgFileName, MAX_SHADER_NAME_LENGTH);
// shaderTable.push_back(shaderEntry);
return shaderEntry.uiShaderID;
}
/////////////////////////////////////////////////////////////////
// Load a pair of shaders, compile, and link together. Specify the complete
// source text for each shader. After the shader names, specify the number
// of attributes, followed by the index and attribute name of each attribute
GLuint gltLoadShaderPairWithAttributes(const char *szVertexProg, const char *szFragmentProg, ...)
{
// Temporary Shader objects
GLuint hVertexShader;
GLuint hFragmentShader;
GLuint hReturn = 0;
GLint testVal;
// Create shader objects
hVertexShader = glCreateShader(GL_VERTEX_SHADER);
hFragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
// Load them. If fail clean up and return null
// Vertex Program
if(gltLoadShaderFile(szVertexProg, hVertexShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
fprintf(stderr, "The shader at %s could ot be found.\n", szVertexProg);
return (GLuint)NULL;
}
// Fragment Program
if(gltLoadShaderFile(szFragmentProg, hFragmentShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
fprintf(stderr,"The shader at %s could not be found.\n", szFragmentProg);
return (GLuint)NULL;
}
// Compile them both
glCompileShader(hVertexShader);
glCompileShader(hFragmentShader);
// Check for errors in vertex shader
glGetShaderiv(hVertexShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
char infoLog[1024];
glGetShaderInfoLog(hVertexShader, 1024, NULL, infoLog);
fprintf(stderr, "The shader at %s failed to compile with the following error:\n%s\n", szVertexProg, infoLog);
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
// Check for errors in fragment shader
glGetShaderiv(hFragmentShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
char infoLog[1024];
glGetShaderInfoLog(hFragmentShader, 1024, NULL, infoLog);
fprintf(stderr, "The shader at %s failed to compile with the following error:\n%s\n", szFragmentProg, infoLog);
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
// Create the final program object, and attach the shaders
hReturn = glCreateProgram();
glAttachShader(hReturn, hVertexShader);
glAttachShader(hReturn, hFragmentShader);
// Now, we need to bind the attribute names to their specific locations
// List of attributes
va_list attributeList;
va_start(attributeList, szFragmentProg);
// Iterate over this argument list
char *szNextArg;
int iArgCount = va_arg(attributeList, int); // Number of attributes
for(int i = 0; i < iArgCount; i++)
{
int index = va_arg(attributeList, int);
szNextArg = va_arg(attributeList, char*);
glBindAttribLocation(hReturn, index, szNextArg);
}
va_end(attributeList);
// Attempt to link
glLinkProgram(hReturn);
// These are no longer needed
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
// Make sure link worked too
glGetProgramiv(hReturn, GL_LINK_STATUS, &testVal);
if(testVal == GL_FALSE)
{
char infoLog[1024];
glGetProgramInfoLog(hReturn, 1024, NULL, infoLog);
fprintf(stderr,"The programs %s and %s failed to link with the following errors:\n%s\n",
szVertexProg, szFragmentProg, infoLog);
glDeleteProgram(hReturn);
return (GLuint)NULL;
}
// All done, return our ready to use shader program
return hReturn;
}
/////////////////////////////////////////////////////////////////
// Load a pair of shaders, compile, and link together. Specify the complete
// file path for each shader. Note, there is no support for
// just loading say a vertex program... you have to do both.
GLuint gltLoadShaderPair(const char *szVertexProg, const char *szFragmentProg, bool loadFromFile)
{
// Temporary Shader objects
GLuint hVertexShader;
GLuint hFragmentShader;
GLuint hReturn = 0;
GLint testVal;
// Create shader objects
hVertexShader = glCreateShader(GL_VERTEX_SHADER);
hFragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
if (loadFromFile)
{
if(gltLoadShaderFile(szVertexProg, hVertexShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
if(gltLoadShaderFile(szFragmentProg, hFragmentShader) == false)
{
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
} else
{
gltLoadShaderSrc(vertexShader, hVertexShader);
gltLoadShaderSrc(fragmentShader, hFragmentShader);
}
// Compile them
glCompileShader(hVertexShader);
glCompileShader(hFragmentShader);
// Check for errors
glGetShaderiv(hVertexShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
char temp[256] = "";
glGetShaderInfoLog( hVertexShader, 256, NULL, temp);
fprintf( stderr, "Compile failed:\n%s\n", temp);
assert(0);
exit(0);
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
glGetShaderiv(hFragmentShader, GL_COMPILE_STATUS, &testVal);
if(testVal == GL_FALSE)
{
char temp[256] = "";
glGetShaderInfoLog( hFragmentShader, 256, NULL, temp);
fprintf( stderr, "Compile failed:\n%s\n", temp);
assert(0);
exit(0);
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
return (GLuint)NULL;
}
// Link them - assuming it works...
hReturn = glCreateProgram();
glAttachShader(hReturn, hVertexShader);
glAttachShader(hReturn, hFragmentShader);
glLinkProgram(hReturn);
// These are no longer needed
glDeleteShader(hVertexShader);
glDeleteShader(hFragmentShader);
// Make sure link worked too
glGetProgramiv(hReturn, GL_LINK_STATUS, &testVal);
if(testVal == GL_FALSE)
{
glDeleteProgram(hReturn);
return (GLuint)NULL;
}
return hReturn;
}
