void NLGLWidget::initializeTexture()
{
if (_texture >= 0) {
cleanupTexture();
}
// Create the texture for displaying the result:
GLuint gltex;
glGenTextures(1, &gltex);
_texture = gltex;
reportGLError("setupGLRendering() genTexture");
// Bind texture:
glBindTexture(GL_TEXTURE_2D, _texture);
reportGLError("setupGLRendering() bindTexture");
// Allocate texture:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, _img_width, _img_height, 0, GL_RGBA, GL_FLOAT, NULL);
reportGLError("setupGLRendering() texImage2D");
// Set texture parameters:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
reportGLError("setupGLRendering() glTexParameteri");
// Unbind texture:
glBindTexture(GL_TEXTURE_2D, 0);
reportGLError("setupGLRendering() bindTexture(0)");
// Register the buffer object:
checkCUDAError("Pre gl register");
cudaGraphicsGLRegisterImage(&_graphicsResource, _texture, GL_TEXTURE_2D, cudaGraphicsMapFlagsWriteDiscard);
checkCUDAError("Post gl register");
}
void loadTextures(tgaInfo *info, GLuint *texture)
{
GLsizei w, h;
int mode;
if (info->status != TGA_OK) {
fprintf(stderr, "error loading texture image: %d\n", info->status);
return;
}
mode = info->pixelDepth / 8; // will be 3 for rgb, 4 for rgba
glGenTextures(1, texture);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
// Upload the texture bitmap.
w = info->width;
h = info->height;
reportGLError("before uploading texture");
GLint format = (mode == 4) ? GL_RGBA : GL_RGB;
glTexImage2D(GL_TEXTURE_2D, 0, format, w, h, 0, format, GL_UNSIGNED_BYTE, info->imageData);
reportGLError("after uploading texture");
tgaDestroy(info);
}
void VertexBufferObject::bufferSubData(GLintptr offset, GLsizeiptr size, const GLvoid *data) {
try {
if(glIsBuffer(_buffer) == GL_FALSE)
throw std::runtime_error("Invalid buffer object");
glBufferSubData(_bufferTarget, offset, size, data);
reportGLError(__FILE__, __LINE__);
} catch(std::runtime_error &err) {
std::cerr << "Error: Failed to create buffer object data store " << std::endl;
std::cerr << "Reason: " << err.what () << std::endl;
}
}
void NLGLWidget::cleanupTexture()
{
if (_texture < 0)
return;
// Unregister the graphics resource:
cudaError_t error = cudaGraphicsUnregisterResource(_graphicsResource);
if (error != cudaSuccess) {
qCritical() << "ERROR! (cleanupGLRendering()) GraphicsUnregisterResource" << cudaGetErrorString(error);
}
// Delete texture:
GLuint gltex = _texture;
glDeleteTextures(1, &gltex);
_texture = -1;
if(_checkboardTexture < 0)
return;
gltex = _checkboardTexture;
glDeleteTextures(1, &gltex);
_checkboardTexture = -1;
reportGLError("OutputTexture cleanup");
}
