void ShaderLibrary::loadPreferences()
{
QString defaultShader(Preferences::DefaultShader());
if (defaultShader.isEmpty()) defaultShader = NoShader;
QVariantMap defaultShaderParameters(Preferences::DefaultShaderParameters());
setUniformVariables(defaultShader, defaultShaderParameters);
bindShader(defaultShader);
}
void render(void) {
glUseProgram(meshObj->shaderProg()->getID());
setUniformVariables();
meshObj->render(GL_TRIANGLES);
glUseProgram(0);
checkError("render");
}
void ShaderLibrary::loadAllShaders()
{
s_shaders.insert(NoShader, 0);
QVariantMap defaultParameters;
defaultParameters.insert("Shininess", QVariant(0.5));
defaultParameters.insert("Highlights", QVariant(0.5));
setUniformVariables(NoShader, defaultParameters);
QDir dir(Preferences::ShaderDirectory());
if (!dir.exists() || !dir.isReadable()) {
QLOG_WARN() << "Could not access shader directory: " + dir.path();
return;
}
QDir::Filters filters(QDir::Files | QDir::Readable);
QStringList contents(dir.entryList(filters));
unsigned program;
QStringList::iterator iter;
for (iter = contents.begin(); iter != contents.end(); ++iter) {
QFileInfo vertex(dir, *iter);
if (vertex.suffix().contains("vert", Qt::CaseInsensitive)) {
QFileInfo fragment(dir, vertex.completeBaseName() + ".frag");
if (fragment.exists()) {
QString name(fragment.completeBaseName());
name = name.replace("_", " ");
program = createProgram(vertex.filePath(), fragment.filePath());
if (program > 0) {
QLOG_DEBUG() << "Shader compilation successful:" << name;
s_shaders.insert(name, program);
QVariantMap uniforms(parseUniformVariables(vertex.filePath()));
uniforms.unite(parseUniformVariables(fragment.filePath()));
setUniformVariables(name, uniforms);
}
}
}
}
}
void render(void) {
glUseProgram(shader_map1["id"]);
setUniformVariables();
setAttribPointers();
// glDrawArrays(mode, first, count)
glDrawArrays(GL_TRIANGLES, 0, numElements);
disableBufObjs();
glUseProgram(0);
checkError("render");
}
void render(void) {
glUseProgram(shader_map1["id"]);
setUniformVariables();
setAttribPointers();
// render the vertices to screen as triangles, start index 0
// glDrawArrays(mode, first, count)
//glDrawArrays(GL_TRIANGLES, 0, numElements);
// modified 26 Jan
// render the vertices to screen as triangles, from 6 vertices
// glDrawElements(mode, count, type, idxPtr)
glDrawElements(GL_TRIANGLES, sizeof(idxArr) / sizeof(GLuint),
GL_UNSIGNED_INT, 0);
disableBufObjs();
glUseProgram(0);
checkError("render");
}
void ShaderLibrary::setFilterVariables(QVariantMap const& map)
{
if (!filtersAvailable()) return;
bool aa(map.contains("Antialias") && map.value("Antialias").toBool());
bool bd(map.contains("Border") && map.value("Border").toBool());
bool ao(map.contains("AmbientOcclusion") && map.value("AmbientOcclusion").toBool());
m_filtersActive = aa || bd || ao;
// Let the shaders know whether or not the Mask texture is valid
QStringList shaders(availableShaders());
QStringList::const_iterator iter;
for (iter = shaders.begin(); iter != shaders.end(); ++iter) {
setUniformVariable(*iter, "FiltersAreValid", m_filtersActive);
}
// Ambient Occlusion parameters
if (ao) {
setUniformVariables("Filters", map);
}
}
int main(int argc, char *argv[])
{
// UI-related variables
int running = 0;
int mousebtn1, lastmousebtn1;
int mousex, mousey, lastmousex, lastmousey;
float posx, posy, zoom, rotx, rotz;
// Shader-related variables
GLuint textureID;
int texw = 0;
int texh = 0;
GLhandleARB programObj;
// Initialise GLFW
glfwInit();
// Open OpenGL window
if( !glfwOpenWindow( 512, 512, 0,0,0,0, 0,0, GLFW_WINDOW ) )
{
glfwTerminate();
return 0;
}
// Init user interface (mouse drag for pan/zoom/tilt/rotation)
posx = 0.0f;
posy = 0.0f;
zoom = 1.0f;
rotx = 0.0f;
rotz = 0.0f;
glfwGetMousePos(&mousex, &mousey); // Requires an open window
lastmousex = mousex;
lastmousey = mousey;
mousebtn1 = lastmousebtn1 = GLFW_RELEASE;
// Load OpenGL extensions (requires an open window)
loadExtensions();
// Load textures
glEnable(GL_TEXTURE_2D);
glGenTextures( 1, &textureID );
loadDistTexture(PATH "disttex.tga", textureID, &texw, &texh);
// Create, load and compile the shader programs
programObj = createShader(PATH "vertex.glsl", PATH "fragment1.glsl");
// Disable vertical sync (on cards that support
// it, and if current driver settings so permit)
glfwSwapInterval( 1 );
// Main loop
running = GL_TRUE;
while( running )
{
showFPS(texw, texh, zoom);
// Set the uniform shader variables
setUniformVariables(programObj, 0, (float)texw, (float)texh);
renderScene(programObj, posx, posy, zoom, rotx, rotz);
glfwSwapBuffers();
// Handle mouse pan (button 1 drag), zoom (shift-btn 1 drag up/down),
// tilt (ctrl-btn 1 drag up/down) and rotation (ctrl-btn 1 drag left/right)
lastmousebtn1 = mousebtn1;
mousebtn1 = glfwGetMouseButton(GLFW_MOUSE_BUTTON_1);
lastmousex = mousex;
lastmousey = mousey;
glfwGetMousePos(&mousex, &mousey);
if((mousebtn1 == GLFW_PRESS) && (lastmousebtn1 == GLFW_PRESS)) {
if(glfwGetKey(GLFW_KEY_LSHIFT)) {
zoom *= pow(1.01, (lastmousey - mousey));
if(zoom < 0.26f) zoom = 0.26f; // Do not go beyond 180 degrees FOV
}
else if (glfwGetKey(GLFW_KEY_LCTRL)) {
rotz -= (lastmousex - mousex) * 0.5;
rotx += (lastmousey - mousey) * 0.5;
if(rotx > 89.5f) rotx = 89.5f;
if(rotx < 0.0f) rotx = 0.0f;
}
else {
posx += (lastmousex - mousex) / zoom;
posy += (lastmousey - mousey) / zoom;
}
}
if(glfwGetKey('1')) {
programObj = createShader(PATH "vertex.glsl", PATH "fragment1.glsl");
}
if(glfwGetKey('2')) {
programObj = createShader(PATH "vertex.glsl", PATH "fragment2.glsl");
}
if(glfwGetKey('3')) {
programObj = createShader(PATH "vertex.glsl", PATH "fragment3.glsl");
}
if(glfwGetKey('4')) {
programObj = createShader(PATH "vertex.glsl", PATH "fragment4.glsl");
}
// Check if the ESC key is pressed or the window has been closed
running = !glfwGetKey( GLFW_KEY_ESC ) &&
glfwGetWindowParam( GLFW_OPENED );
}
// Close the window (if still open) and terminate GLFW
glfwTerminate();
return 0;
}