Image Texture::copyToImage() const
{
// Easy case: empty texture
if (!m_texture)
return Image();
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
// Create an array of pixels
std::vector<Uint8> pixels(m_size.x * m_size.y * 4);
if ((m_size == m_actualSize) && !m_pixelsFlipped)
{
// Texture is not padded nor flipped, we can use a direct copy
glCheck(glBindTexture(GL_TEXTURE_2D, m_texture));
glCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]));
}
else
{
// Texture is either padded or flipped, we have to use a slower algorithm
// All the pixels will first be copied to a temporary array
std::vector<Uint8> allPixels(m_actualSize.x * m_actualSize.y * 4);
glCheck(glBindTexture(GL_TEXTURE_2D, m_texture));
glCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &allPixels[0]));
// Then we copy the useful pixels from the temporary array to the final one
const Uint8* src = &allPixels[0];
Uint8* dst = &pixels[0];
int srcPitch = m_actualSize.x * 4;
int dstPitch = m_size.x * 4;
// Handle the case where source pixels are flipped vertically
if (m_pixelsFlipped)
{
src += srcPitch * (m_size.y - 1);
srcPitch = -srcPitch;
}
for (unsigned int i = 0; i < m_size.y; ++i)
{
std::memcpy(dst, src, dstPitch);
src += srcPitch;
dst += dstPitch;
}
}
// Create the image
Image image;
image.create(m_size.x, m_size.y, &pixels[0]);
return image;
}
Image Texture::CopyToImage() const
{
// Easy case: empty texture
if (!myTexture)
return Image();
EnsureGlContext();
// Create an array of pixels
std::vector<Uint8> pixels(myWidth * myHeight * 4);
if ((myWidth == myTextureWidth) && (myHeight == myTextureHeight) && !myPixelsFlipped)
{
// Texture is not padded nor flipped, we can use a direct copy
GLCheck(glBindTexture(GL_TEXTURE_2D, myTexture));
GLCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]));
}
else
{
// Texture is either padded or flipped, we have to use a slower algorithm
// All the pixels will first be copied to a temporary array
std::vector<Uint8> allPixels(myTextureWidth * myTextureHeight * 4);
GLCheck(glBindTexture(GL_TEXTURE_2D, myTexture));
GLCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &allPixels[0]));
// Then we copy the useful pixels from the temporary array to the final one
const Uint8* src = &allPixels[0];
Uint8* dst = &pixels[0];
int srcPitch = myTextureWidth * 4;
int dstPitch = myWidth * 4;
// Handle the case where source pixels are flipped vertically
if (myPixelsFlipped)
{
src += srcPitch * (myHeight - 1);
srcPitch = -srcPitch;
}
for (unsigned int i = 0; i < myHeight; ++i)
{
std::memcpy(dst, src, dstPitch);
src += srcPitch;
dst += dstPitch;
}
}
// Create the image
Image image;
image.Create(myWidth, myHeight, &pixels[0]);
return image;
}
Image Texture::copyToImage() const
{
// Easy case: empty texture
if (!m_texture)
return Image();
ensureGlContext();
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
// Create an array of pixels
std::vector<Uint8> pixels(m_size.x * m_size.y * 4);
#ifdef SFML_OPENGL_ES
// OpenGL ES doesn't have the glGetTexImage function, the only way to read
// from a texture is to bind it to a FBO and use glReadPixels
GLuint frameBuffer = 0;
glCheck(GLEXT_glGenFramebuffers(1, &frameBuffer));
if (frameBuffer)
{
GLint previousFrameBuffer;
glCheck(glGetIntegerv(GLEXT_GL_FRAMEBUFFER_BINDING, &previousFrameBuffer));
glCheck(GLEXT_glBindFramebuffer(GLEXT_GL_FRAMEBUFFER, frameBuffer));
glCheck(GLEXT_glFramebufferTexture2D(GLEXT_GL_FRAMEBUFFER, GLEXT_GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture, 0));
glCheck(glReadPixels(0, 0, m_size.x, m_size.y, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]));
glCheck(GLEXT_glDeleteFramebuffers(1, &frameBuffer));
glCheck(GLEXT_glBindFramebuffer(GLEXT_GL_FRAMEBUFFER, previousFrameBuffer));
}
#else
if ((m_size == m_actualSize) && !m_pixelsFlipped)
{
// Texture is not padded nor flipped, we can use a direct copy
glCheck(glBindTexture(GL_TEXTURE_2D, m_texture));
glCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]));
}
else
{
// Texture is either padded or flipped, we have to use a slower algorithm
// All the pixels will first be copied to a temporary array
std::vector<Uint8> allPixels(m_actualSize.x * m_actualSize.y * 4);
glCheck(glBindTexture(GL_TEXTURE_2D, m_texture));
glCheck(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &allPixels[0]));
// Then we copy the useful pixels from the temporary array to the final one
const Uint8* src = &allPixels[0];
Uint8* dst = &pixels[0];
int srcPitch = m_actualSize.x * 4;
int dstPitch = m_size.x * 4;
// Handle the case where source pixels are flipped vertically
if (m_pixelsFlipped)
{
src += srcPitch * (m_size.y - 1);
srcPitch = -srcPitch;
}
for (unsigned int i = 0; i < m_size.y; ++i)
{
std::memcpy(dst, src, dstPitch);
src += srcPitch;
dst += dstPitch;
}
}
#endif // SFML_OPENGL_ES
// Create the image
Image image;
image.create(m_size.x, m_size.y, &pixels[0]);
return image;
}
