//========================================================================
int main( ){
// ofSetupOpenGL(1024,768,OF_WINDOW); // <-------- setup the GL context
ofGLWindowSettings settings;
settings.setGLVersion(3, 2); // Programmable pipeline
settings.width = 1024;
settings.height = 768;
ofCreateWindow(settings);
if(!ofGLCheckExtension("GL_ARB_geometry_shader4") && !ofGLCheckExtension("GL_EXT_geometry_shader4") && !ofIsGLProgrammableRenderer()){
ofLogFatalError() << "geometry shaders not supported on this graphics card";
return 1;
}
GLint major;
GLint minor;
glGetIntegerv(GL_MAJOR_VERSION, &major);
glGetIntegerv(GL_MINOR_VERSION, &minor);
ofLogNotice() << "opengl: " << major << "." << minor;
// this kicks off the running of my app
// can be OF_WINDOW or OF_FULLSCREEN
// pass in width and height too:
ofRunApp(new ofApp());
}
//--------------------------------------------------------------
bool ofFbo::checkGLSupport() {
#ifndef TARGET_OPENGLES
if (!ofIsGLProgrammableRenderer()){
if(ofGLCheckExtension("GL_EXT_framebuffer_object")){
ofLogVerbose("ofFbo") << "GL frame buffer object supported";
}else{
ofLogError("ofFbo") << "GL frame buffer object not supported by this graphics card";
return false;
}
}
glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &_maxColorAttachments);
glGetIntegerv(GL_MAX_DRAW_BUFFERS, &_maxDrawBuffers);
glGetIntegerv(GL_MAX_SAMPLES, &_maxSamples);
ofLogVerbose("ofFbo") << "checkGLSupport(): "
<< "maxColorAttachments: " << _maxColorAttachments << ", "
<< "maxDrawBuffers: " << _maxDrawBuffers << ", "
<< "maxSamples: " << _maxSamples;
#else
if(ofIsGLProgrammableRenderer() || ofGLCheckExtension("GL_OES_framebuffer_object")){
ofLogVerbose("ofFbo") << "GL frame buffer object supported";
}else{
ofLogError("ofFbo") << "GL frame buffer object not supported by this graphics card";
return false;
}
#endif
return true;
}
//========================================================================
int main( ){
ofSetupOpenGL(1024,768, OF_WINDOW); // <-------- setup the GL context
if(!ofGLCheckExtension("GL_ARB_geometry_shader4") && !ofGLCheckExtension("GL_EXT_geometry_shader4") && !ofIsGLProgrammableRenderer()){
ofLogFatalError() << "geometry shaders not supported on this graphics card";
return 1;
}
// this kicks off the running of my app
// can be OF_WINDOW or OF_FULLSCREEN
// pass in width and height too:
ofRunApp( new testApp());
}
ofBufferObject::Data::Data()
:id(0)
,size(0)
,lastTarget(GL_ARRAY_BUFFER)
,useDSA(false){
// tig: glGenBuffers does not actually create a buffer, it just
// returns the next available name, and only a subsequent
// call to bind() will actualy initialize the buffer in
// memory.
//
// This is why, for direct state access, we need to call
// glCreateBuffers(), so that the buffer is initialized
// when we pin data to it using setData()
//
// see also: https://www.opengl.org/registry/specs/ARB/direct_state_access.txt
#ifdef GLEW_ARB_direct_state_access
if (ofGLCheckExtension("GL_ARB_direct_state_access")) {
useDSA = true;
// the above condition is only true if GLEW can provide us
// with direct state access methods. we use this to test
// whether the driver is OpenGL 4.5 ready.
glCreateBuffers(1,&id);
return;
}
#endif
glGenBuffers(1,&id);
}
//----------------------------------------------------------
void ofTexture::generateMipmap(){
// Generate mipmaps using hardware-accelerated core GL methods.
// 1. Check whether the current OpenGL version supports mipmap generation:
// glGenerateMipmap() was introduced to OpenGL core in 3.0, and
// OpenGLES core in 2.0 but earlier versions may support it if they
// support extension GL_EXT_framebuffer_object
bool isGlGenerateMipmapAvailable = false;
if(ofIsGLProgrammableRenderer()){
isGlGenerateMipmapAvailable = true;
}
if (!isGlGenerateMipmapAvailable && !ofGLCheckExtension("GL_EXT_framebuffer_object")) {
static bool versionWarningIssued = false;
if (!versionWarningIssued) ofLogWarning() << "Your current OpenGL version does not support mipmap generation via glGenerateMipmap().";
versionWarningIssued = true;
texData.hasMipmap = false;
return;
}
// 2. Check whether the texture's texture target supports mipmap generation.
switch (texData.textureTarget) {
/// OpenGL ES only supports mipmap for the following two texture targets:
case GL_TEXTURE_2D:
case GL_TEXTURE_CUBE_MAP:
#ifndef TARGET_OPENGLES
/// OpenGL supports mipmaps for additional texture targets:
case GL_TEXTURE_1D:
case GL_TEXTURE_3D:
case GL_TEXTURE_1D_ARRAY:
case GL_TEXTURE_2D_ARRAY:
#endif
{
// All good, this particular texture target supports mipmaps.
// glEnable(texData.textureTarget); /// < uncomment this hack if you are unlucky enough to run an older ATI card.
// See also: https://www.opengl.org/wiki/Common_Mistakes#Automatic_mipmap_generation
glBindTexture(texData.textureTarget, (GLuint) texData.textureID);
glGenerateMipmap(texData.textureTarget);
glBindTexture(texData.textureTarget, 0);
texData.hasMipmap = true;
break;
}
default:
{
// This particular texture target does not support mipmaps.
static bool warningIssuedAlready = false;
if (!warningIssuedAlready){
ofLogWarning() << "Mipmaps are not supported for textureTarget 0x" << hex << texData.textureTarget << endl
<< "Most probably you are trying to create mipmaps from a GL_TEXTURE_RECTANGLE texture." << endl
<< "Try ofDisableArbTex() before loading this texture.";
warningIssuedAlready = true;
}
texData.hasMipmap = false;
break;
}
} // end switch(texData.textureTarget)
}
void ofDisableGLDebugLog(){
if(ofGLCheckExtension("GL_KHR_debug") && ofGLCheckExtension("GL_ARB_debug_output")){
glDisable(GL_DEBUG_OUTPUT);
}
}
void ofEnableGLDebugLog(){
if(ofGLCheckExtension("GL_KHR_debug") && ofGLCheckExtension("GL_ARB_debug_output")){
glEnable(GL_DEBUG_OUTPUT);
glDebugMessageCallback((GLDEBUGPROC)gl_debug_callback, nullptr);
}
}