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У меня проблема при попытке загрузить изображение с помощью библиотек GDAL и реализует его (изображение) в OpenGL Control. Проблема заключается в цвете, как вы можете видеть на picture.Загрузить изображение с библиотеками GDAL (VC++)
И это функция для генерации текстуры с картинки:
GLuint COpenGLControl::ReadGDALData(CString filename)
{
BYTE* tempReturn;
GLuint texture;
GDALDataset *poDataset;
GDALAllRegister();
poDataset = (GDALDataset *) GDALOpen((const char *)(CStringA)filename, GA_ReadOnly);
int Height = poDataset->GetRasterXSize(), Width = poDataset->GetRasterYSize();
LONG LineBytes = (Width*8+31)/32*4;
BYTE * pData = (BYTE *)new char[ LineBytes * Height * 3];
if (poDataset == NULL)
{
AfxMessageBox("Couldn't open selected file!");
return NULL;
}
nBands = poDataset->GetRasterCount();
GDALRasterBand **poBand;
poBand = new GDALRasterBand *[nBands];
if (poBand == NULL)
{
AfxMessageBox("Couldn't open the bands!", MB_ICONWARNING);
return NULL;
}
for (int i=0; i<nBands; i++)
{
poBand[i] = poDataset->GetRasterBand(i+1);
if (poBand[i] == NULL)
{
AfxMessageBox("Couldn't open selected bands", MB_ICONWARNING);
return NULL;
}
}
int BandChoice = 2;
nXsize = poBand[BandChoice]->GetXSize();
nYsize = poBand[BandChoice]->GetYSize();
if (BandChoice == 1)
{
poBandBlock_Gray = (BYTE*)CPLMalloc(sizeof(BYTE)*(nXsize*nYsize));
poBand[BandChoice]->RasterIO(GF_Read, 0, 0, nXsize, nYsize, poBandBlock_Gray, nXsize, nYsize, poBand[BandChoice]->GetRasterDataType(), 0, 0);
}
else
{
int nXsize_R, nXsize_G, nXsize_B;
int nYsize_R, nYsize_G, nYsize_B;
int BandChoiceR = 0;
int BandChoiceG = 1;
int BandChoiceB = 2;
nXsize_R = poBand[BandChoiceR]->GetXSize();
nXsize_G = poBand[BandChoiceG]->GetXSize();
nXsize_B = poBand[BandChoiceB]->GetXSize();
nYsize_R = poBand[BandChoiceR]->GetYSize();
nYsize_G = poBand[BandChoiceG]->GetYSize();
nYsize_B = poBand[BandChoiceB]->GetYSize();
nXsize = nXsize_R;
nYsize = nYsize_R;
poBandBlock_R = (BYTE*)CPLMalloc(sizeof(BYTE)*(nXsize_R*nYsize_R));
poBandBlock_G = (BYTE*)CPLMalloc(sizeof(BYTE)*(nXsize_G*nYsize_G));
poBandBlock_B = (BYTE*)CPLMalloc(sizeof(BYTE)*(nXsize_B*nYsize_B));
poBand[BandChoiceR]->RasterIO(GF_Read, 0, 0, nXsize_R, nYsize_R, poBandBlock_R, nXsize_R, nYsize_R, poBand[BandChoiceR]->GetRasterDataType(), 0, 0);
poBand[BandChoiceG]->RasterIO(GF_Read, 0, 0, nXsize_G, nYsize_G, poBandBlock_G, nXsize_G, nYsize_G, poBand[BandChoiceG]->GetRasterDataType(), 0, 0);
poBand[BandChoiceB]->RasterIO(GF_Read, 0, 0, nXsize_B, nYsize_B, poBandBlock_B, nXsize_B, nYsize_B, poBand[BandChoiceB]->GetRasterDataType(), 0, 0);
delete poDataset;
}
if (BandChoice == 1)
{
for (int i=0; i < Height; i++)
{
for (int j=0; j < Width; j++)
{
pData[(Height-i-1) * LineBytes + j] = poBandBlock_Gray[i*Width + j];
}
}
CPLFree(poBandBlock_Gray);
}
else
{
int j2 ;
for (int i=0; i<Height; i++)
{
for (int j=0, j2=0; j < Width, j2 < 3 * Width; j++, j2+=3)
{
pData[(Height-i-1)*LineBytes + j2+2] = poBandBlock_R[i*Width + j];
pData[(Height-i-1)*LineBytes + j2+1] = poBandBlock_G[i*Width + j];
pData[(Height-i-1)*LineBytes + j2] = poBandBlock_B[i*Width + j];
}
}
CPLFree(poBandBlock_B);
CPLFree(poBandBlock_R);
CPLFree(poBandBlock_G);
}
// allocate a texture name
glGenTextures(1, &texture);
// select our current texture
glBindTexture(GL_TEXTURE_2D, texture);
// select modulate to mix texture with color for shading
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
// when texture area is small, bilinear filter the closest mipmap
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_NEAREST);
// when texture area is large, bilinear filter the first mipmap
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// if wrap is true, the texture wraps over at the edges (repeat)
// ... false, the texture ends at the edges (clamp)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, FALSE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, FALSE);
// build our texture mipmaps
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, Width, Height, GL_RGB, GL_UNSIGNED_BYTE, pData);
// free buffer
free(pData);
return texture;
}
Это функция Draw:
void COpenGLControl::OnDraw(CDC *pDC)
{
// TODO: Camera controls
wglMakeCurrent(hdc,hrc);
// Set color to use when clearing the background.
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
// Turn on backface culling
glFrontFace(GL_CCW);
glCullFace(GL_FRONT_AND_BACK);
// Turn on depth testing
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear all objects
glEnable(GL_TEXTURE_2D); // enable texture for 2 dimensions
glPushMatrix();
if (filename.IsEmpty() == false)
{
imgData = ReadGDALData(filename);
glBindTexture(GL_TEXTURE_2D, imgData);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear all objects
glLoadIdentity();
gluLookAt (0,0,1,0,0,0,0,1,0);
glTranslatef (m_fPosX, m_fPosY, 0.0f);
glScalef (m_fZoom,m_fZoom,1.0);
glBegin(GL_QUADS); // apply loaded texture to viewport
glTexCoord2d(0.0,0.0); glVertex2d(-1.0,-1.0);
glTexCoord2d(1.0,0.0); glVertex2d(+1.0,-1.0);
glTexCoord2d(1.0,1.0); glVertex2d(+1.0,+1.0);
glTexCoord2d(0.0,1.0); glVertex2d(-1.0,+1.0);
glEnd();
}
glPopMatrix();
glDisable(GL_TEXTURE_2D);
glFlush();
// Swap buffers
SwapBuffers(hdc);
wglMakeCurrent(NULL, NULL);
}