Hi Forum,
is there any way to create uniform buffer with OF as follows:
glGenBuffers(1, &rain_buffer);
glBindBuffer(GL_UNIFORM_BUFFER, rain_buffer);
glBufferData(GL_UNIFORM_BUFFER, 256 * sizeof(vmath::vec4), NULL, GL_DYNAMIC_DRAW);
I guess that i have edit the ofVbo class to arrange this. Any suggestion from the community ?
Thanks
Hi ,
I tried to run all the examples that came along with the plugin and all of them failed. The first one is example_BasicUsage and i get the following compilation error:
Ubo/src/ofxUbo.cpp
../../../addons/ofxUbo/src/ofxUbo.cpp: In static member function ‘static GLuint ofxUboSingeltons::findFirstAvaliableBindingSpot()’:
../../../addons/ofxUbo/src/ofxUbo.cpp:189:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < bindingPointSlots.size(); i++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp: In function ‘std::ostream& operator<<(std::ostream&, const ofxUboLayout&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:203:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < layout.uniformData.size(); i++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp: In copy constructor ‘ofxUboShader::ofxUboShader(const ofxUboShader&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:231:10: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:15: error: ‘it’ does not name a type
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:34: error: expected ‘;’ before ‘it’
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:34: error: ‘it’ was not declared in this scope
../../../addons/ofxUbo/src/ofxUbo.cpp: In member function ‘ofxUboShader& ofxUboShader::operator=(const ofxUboShader&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:243:10: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:15: error: ‘it’ does not name a type
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:34: error: expected ‘;’ before ‘it’
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:34: error: ‘it’ was not declared in this scope
../../../addons/ofxUbo/src/ofxUbo.cpp: In member function ‘ofxUboLayout ofxUboShader::getLayout(const string&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:295:20: warning: unused variable ‘index’ [-Wunused-variable]
int actualLen, index, uniType,uniSize, uniMatStride, uniArrayStride, uniOffset;
^
make[1]: *** [../../../addons/obj/linux/Release/ofxUbo/src/ofxUbo.o] Error 1
make[1]: Leaving directory `/home/sajjad/Downloads/openFrameworks/master/openFrameworks-master/examples/addons/example_BasicUsage'
make: *** [Release] Error 2
And the next one is example_lights. I got the similar error:
src/ofxUbo.o -c ../../../addons/ofxUbo/src/ofxUbo.cpp
../../../addons/ofxUbo/src/ofxUbo.cpp: In static member function ‘static GLuint ofxUboSingeltons::findFirstAvaliableBindingSpot()’:
../../../addons/ofxUbo/src/ofxUbo.cpp:189:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < bindingPointSlots.size(); i++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp: In function ‘std::ostream& operator<<(std::ostream&, const ofxUboLayout&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:203:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < layout.uniformData.size(); i++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp: In copy constructor ‘ofxUboShader::ofxUboShader(const ofxUboShader&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:231:10: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:15: error: ‘it’ does not name a type
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:34: error: expected ‘;’ before ‘it’
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:231:34: error: ‘it’ was not declared in this scope
../../../addons/ofxUbo/src/ofxUbo.cpp: In member function ‘ofxUboShader& ofxUboShader::operator=(const ofxUboShader&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:243:10: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:15: error: ‘it’ does not name a type
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:34: error: expected ‘;’ before ‘it’
for (auto it = ubos.begin(); it!=ubos.end(); it++) {
^
../../../addons/ofxUbo/src/ofxUbo.cpp:243:34: error: ‘it’ was not declared in this scope
../../../addons/ofxUbo/src/ofxUbo.cpp: In member function ‘ofxUboLayout ofxUboShader::getLayout(const string&)’:
../../../addons/ofxUbo/src/ofxUbo.cpp:295:20: warning: unused variable ‘index’ [-Wunused-variable]
int actualLen, index, uniType,uniSize, uniMatStride, uniArrayStride, uniOffset;
^
make[1]: *** [../../../addons/obj/linux/Release/ofxUbo/src/ofxUbo.o] Error 1
make[1]: Leaving directory `/home/sajjad/Downloads/openFrameworks/master/openFrameworks-master/examples/addons/example_lights'
make: *** [Release] Error 2
Where should i look into now ?
Thanks
This seems to be the defining line. Compile with c++11 support. This support can be enabled with the -std=c++11 or -std=gnu++11 compiler options. Or replace auto with the correct iterator type.
Best, V
Thanks,
The issue is solved. Now i have going through another one while using ofxUbo to develop a small app.
Please check the following snippet:
struct BlobSettings
{
ofVec4f InnerColor;
ofVec4f OuterColor;
float RadiusInner;
float RadiusOuter;
};
Then i declare a class as follows:
class ofApp : public ofBaseApp
{
public:
void setup();
void update();
void draw();
void keyPressed(int key);
void keyReleased(int key);
void mouseMoved(int x, int y );
void mouseDragged(int x, int y, int button);
void mousePressed(int x, int y, int button);
void mouseReleased(int x, int y, int button);
void windowResized(int w, int h);
void dragEvent(ofDragInfo dragInfo);
void gotMessage(ofMessage msg);
private:
ofxUboShader shader;
ofVbo vbo;
BlobSettings blob;
};
Now lets take a look inside the class definition.
void ofApp::setup()
{
//load the shaders
//load the programmable shaders
if(ofIsGLProgrammableRenderer())
{
shader.load("shaders/uniformblock");
}
else
{
std::cout << "Programmable Shading is not supported. " << std::endl;
exit();
}
//position data
float positionData[] =
{
-0.8f, -0.8f, 0.0f,1.0f,
0.8f, -0.8f, 0.0f,1.0f,
0.8f, 0.8f, 0.0f,1.0f,
-0.8f, -0.8f, 0.0f,1.0f,
0.8f, 0.8f, 0.0f,1.0f,
-0.8f, 0.8f, 0.0f,1.0f
};
float tcData[] =
{
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
//set the vertex and texture data for the vertex buffer object
vbo.setVertexData(&positionData[0],6,24,GL_STATIC_DRAW);
vbo.setTexCoordData(&tcData[0],12,GL_STATIC_DRAW);
//pull out the current renderer
ofPtr<ofBaseRenderer> renderer = ofGetCurrentRenderer();
//set the blend mode with the current renderer
renderer->setBlendMode(OF_BLENDMODE_ALPHA);
//print the layouts for the uniform buffer
shader.printLayout("BlobSettings");
//setup the blob value
blob.InnerColor = ofVec4f(0.0f,0.0f,0.0f,0.0f);
blob.OuterColor = ofVec4f(1.0f,1.0f,0.75f,1.0f);
blob.RadiusInner = 0.25f;
blob.RadiusOuter = 0.45f;
}
At last the draw function:
void ofApp::draw()
{
shader.begin();
shader.setUniformBuffer("BlobSettings", blob);
//just draw the blob
vbo.draw(GL_TRIANGLES,0,6);
shader.end();
}
I am having blank screen - probably one of the most common problem anyone encounter when start with something based on OpenGL. Now let get inside the shader:
#version 430 core
in vec4 position;
in vec2 texcoord;
uniform mat4 modelViewProjectionMatrix;
out vec2 TexCoord;
void main()
{
TexCoord = texcoord;
gl_Position = modelViewProjectionMatrix * position;
}
And the fragment shader:
#version 430 core
in vec2 TexCoord;
out vec4 outputColor;
uniform BlobSettings
{
vec4 InnerColor;
vec4 OuterColor;
float RadiusInner;
float RadiusOuter;
};
void main()
{
float dx = TexCoord.x - 0.5;
float dy = TexCoord.y - 0.5;
float dist = sqrt(dx * dx + dy * dy);
outputColor =
mix( InnerColor, OuterColor,
smoothstep( RadiusInner, RadiusOuter, dist )
);
}
What am i missing folks? Some hint will help me to debug this type of issue.
Thanks
setVetrexData and setTexCoordData are wrong, should be
vbo.setVertexData(&positionData[0], 4, 6, GL_STATIC_DRAW,sizeof(ofVec4f));
vbo.setTexCoordData(&tcData[0],6,GL_STATIC_DRAW,sizeof(ofVec2f));
Also you did not change the Projection Matrix to represent your coordinate system. So in in the shader you probably want this, Dont multiply by anything.
gl_Position = position;