You are at least not setting the required texture parameters which will make the texture incomplete. You typically need to set the textures wrap and min/mag filters at least once:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); btw, I would think the "Scene Graph - Rendering FBOs" example I added for 5.1 is a good starting place for implementing what you are trying to do here: http://doc-snapshot.qt-project.org/qt5-stable/qtquick/scenegraph-textureinsgnode.html cheers, Gunnar On May 2, 2013, at 12:31 PM, BOUCARD Olivier <boucard_oliv...@yahoo.fr> wrote: > Hi guys, > > I'm trying to display some "native" OpenGL inside a custom QML item using > Qt 5.0.2 on a Linux x86_64 with a Nvidia 9600M GT (driver v295.40). > I have a custom QQuickPaintedItem with a overloaded paint where I use > painter->beginNativePainting() and a shader program: > > Vertex shader: > > uniform highp mat4 projectionMatrix; > uniform highp mat4 modelViewMatrix; > > void main(void) > { > gl_Position = projectionMatrix * modelViewMatrix * gl_Vertex; > gl_FrontColor = gl_Color; > gl_TexCoord[0] = gl_MultiTexCoord0; > } > > > > Fragment shader: > > uniform highp sampler2D diffuseTexture; > > void main(void) > { > gl_FragColor = texture2D(diffuseTexture, gl_TexCoord[0].st); > //gl_FragColor = gl_Color; // Display the mesh in white -> OK > > //gl_FragColor = vec4(gl_TexCoord[0].st, 0.0, 1.0); // Display the correct > coord -> OK > } > > > > I have a mesh class used to load a mesh using Assimp. At the moment I only > load a simple cube.obj. > The rendering code is the following: > > void Mesh::render() > { > if(mData->hasDiffuse) > { > glActiveTexture(GL_TEXTURE0); > glBindTexture(GL_TEXTURE_2D, mData->diffuse); > } > > glEnableVertexAttribArray(SimpleGameEngine::sAttrLocVertex); > glEnableVertexAttribArray(SimpleGameEngine::sAttrLocTex0); > glBindBuffer(GL_ARRAY_BUFFER, mData->vertexBuffer); > glVertexAttribPointer(SimpleGameEngine::sAttrLocVertex, 3, GL_FLOAT, > GL_FALSE, 0, NULL); > > glBindBuffer(GL_ARRAY_BUFFER, mData->texBuffer); > glVertexAttribPointer(SimpleGameEngine::sAttrLocTex0, 2, GL_FLOAT, > GL_FALSE, 0, NULL); > > glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mData->faceBuffer); > glDrawElements(GL_TRIANGLES, mData->faceNum * 3,GL_UNSIGNED_INT, 0); > > glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); > glBindBuffer(GL_ARRAY_BUFFER, 0); > glDisableVertexAttribArray(SimpleGameEngine::sAttrLocTex0); > glDisableVertexAttribArray(SimpleGameEngine::sAttrLocVertex); > > if(mData->hasDiffuse) > { > glBindTexture(GL_TEXTURE_2D, 0); > glActiveTexture(GL_TEXTURE0); > } > } > > My texture is loaded using the following code: > > void Mesh::setDiffuseTexture(const QImage &image) > { > if(image.isNull()) qFatal("Invalid image"); > > QImage texture = QGLWidget::convertToGLFormat(image); > > if(texture.isNull()) qFatal("Invalid texture"); > > glGenTextures(1, &mData->diffuse); > > glBindTexture(GL_TEXTURE_2D, mData->diffuse); > > glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, texture.width(), texture.height(), > 0, GL_RGBA, GL_UNSIGNED_BYTE, texture.bits()); > > glBindTexture(GL_TEXTURE_2D, 0); > > mData->hasDiffuse = true; > } > > Everything works. But as soon as I add the texture my cube turns black. > I already try with a procedural 4x4 checker texture and it didn't work either. > > > Any help will be appreciated. > Olivier. > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
