/* compile shaders and return their ids in a 2-vector */
glm::ivec2 loadShaders(std::string vertFile, std::string fragFile)
{
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
/* read shader files into strings */
std::ifstream vfile(vertFile.c_str());
std::ifstream ffile(fragFile.c_str());
std::ostringstream vbuffer, fbuffer;
vbuffer << vfile.rdbuf();
fbuffer << ffile.rdbuf();
std::string vertexString(vbuffer.str());
std::string fragmentString(fbuffer.str());
/* convert strings to c_strings and set as shader source */
char *vertexCString, *fragmentCString;
vertexCString = new char[vertexString.length() + 1];
fragmentCString = new char[fragmentString.length() + 1];
strcpy(vertexCString, vertexString.c_str());
strcpy(fragmentCString, fragmentString.c_str());
glShaderSource(vertexShader, 1, (const char**)&vertexCString, 0);
glShaderSource(fragmentShader, 1, (const char**)&fragmentCString, 0);
delete vertexCString;
delete fragmentCString;
/* compile shaders and check for errors */
GLint status;
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
if(status != GL_TRUE)
{
char log[2048];
int len;
glGetShaderInfoLog(vertexShader, 2048, (GLsizei*)&len, log);
fprintf(stderr, "Vertex Shader: %s", log);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
exit(1);
}
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &status);
if(status != GL_TRUE)
{
char log[2048];
int len;
glGetShaderInfoLog(fragmentShader, 2048, (GLsizei*)&len, log);
fprintf(stderr, "Fragment Shader: %s", log);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
exit(1);
}
return glm::ivec2(vertexShader, fragmentShader);
}
static inline void dumpTextBoxes(Vector<SVGInlineTextBox*>& boxes)
{
unsigned boxCount = boxes.size();
fprintf(stderr, "Dumping all text fragments in text sub tree, %i boxes\n", boxCount);
for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) {
SVGInlineTextBox* textBox = boxes.at(boxPosition);
Vector<SVGTextFragment>& fragments = textBox->textFragments();
fprintf(stderr, "-> Box %i: Dumping text fragments for SVGInlineTextBox, textBox=%p, textRenderer=%p\n", boxPosition, textBox, textBox->textRenderer());
fprintf(stderr, " textBox properties, start=%i, len=%i, box direction=%i\n", textBox->start(), textBox->len(), textBox->direction());
fprintf(stderr, " textRenderer properties, textLength=%i\n", textBox->textRenderer()->textLength());
const UChar* characters = textBox->textRenderer()->characters();
unsigned fragmentCount = fragments.size();
for (unsigned i = 0; i < fragmentCount; ++i) {
SVGTextFragment& fragment = fragments.at(i);
String fragmentString(characters + fragment.characterOffset, fragment.length);
fprintf(stderr, " -> Fragment %i, x=%lf, y=%lf, width=%lf, height=%lf, characterOffset=%i, length=%i, characters='%s'\n"
, i, fragment.x, fragment.y, fragment.width, fragment.height, fragment.characterOffset, fragment.length, fragmentString.utf8().data());
}
}
}
GLuint engine::loadshaders(std::string vertfile, std::string fragfile,
std::vector<std::string> in_attributes,
std::vector<std::string> out_attributes)
{
/* init glew and load compiled shaders */
glewInit();
if(!glewIsSupported("GL_VERSION_2_0 GL_ARB_multitexture GL_EXT_framebuffer_object"))
{
fprintf(stderr, "Required OpenGL extensions missing\n");
return -1;
}
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
/* read shader files into strings */
std::ifstream vfile(vertfile.c_str());
std::ifstream ffile(fragfile.c_str());
if(!vfile)
{
std::cout << vertfile << " does not exist!\n";
exit(1);
}
if(!ffile)
{
std::cout << fragfile << " does not exist!\n";
exit(1);
}
std::ostringstream vbuffer, fbuffer;
vbuffer << vfile.rdbuf();
fbuffer << ffile.rdbuf();
std::string vertexString(vbuffer.str());
std::string fragmentString(fbuffer.str());
/* convert strings to c_strings and set as shader source */
char *vertexCString, *fragmentCString;
vertexCString = new char[vertexString.length() + 1];
fragmentCString = new char[fragmentString.length() + 1];
strcpy(vertexCString, vertexString.c_str());
strcpy(fragmentCString, fragmentString.c_str());
glShaderSource(vertexShader, 1, (const char**)&vertexCString, 0);
glShaderSource(fragmentShader, 1, (const char**)&fragmentCString, 0);
delete vertexCString;
delete fragmentCString;
/* compile shaders and check for errors */
GLint status;
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
if(status != GL_TRUE)
{
char log[2048];
int len;
glGetShaderInfoLog(vertexShader, 2048, (GLsizei*)&len, log);
fprintf(stderr, "Vertex Shader: %s", log);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
exit(1);
}
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &status);
if(status != GL_TRUE)
{
char log[2048];
int len;
glGetShaderInfoLog(fragmentShader, 2048, (GLsizei*)&len, log);
fprintf(stderr, "Fragment Shader: %s", log);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
exit(1);
}
/* create program, bind attributes, and link program */
int program = glCreateProgram();
glAttachShader(program, vertexShader);
glAttachShader(program, fragmentShader);
int num_in_attributes = in_attributes.size();
for(int i = 0; i < num_in_attributes; i++)
{
glBindAttribLocation(program, i, in_attributes.at(i).c_str());
}
int num_out_attributes = out_attributes.size();
for(int i = 0; i < num_out_attributes; i++)
{
glBindFragDataLocation(program, i, out_attributes.at(i).c_str());
}
glLinkProgram(program);
GLint pstatus;
glGetProgramiv(program, GL_LINK_STATUS, &pstatus);
if(pstatus != GL_TRUE)
{
char log[2048];
int len;
glGetProgramInfoLog(program, 2048, (GLsizei*)&len, log);
fprintf(stderr, "%s", log);
glDeleteProgram(program);
return -1;
}
return program;
}
