bool WebGLTexture::canGenerateMipmaps()
{
if (isNPOT())
return false;
const LevelInfo& first = m_info[0][0];
for (size_t ii = 0; ii < m_info.size(); ++ii) {
const LevelInfo& info = m_info[ii][0];
if (!info.valid
|| info.width != first.width || info.height != first.height
|| info.internalFormat != first.internalFormat || info.type != first.type)
return false;
}
return true;
}
void WebGLTexture::update()
{
m_isNPOT = false;
for (size_t ii = 0; ii < m_info.size(); ++ii) {
if (isNPOT(m_info[ii][0].width, m_info[ii][0].height)) {
m_isNPOT = true;
break;
}
}
m_isComplete = true;
const LevelInfo& first = m_info[0][0];
int levelCount = computeLevelCount(first.width, first.height);
if (levelCount < 1)
m_isComplete = false;
else {
for (size_t ii = 0; ii < m_info.size() && m_isComplete; ++ii) {
const LevelInfo& info0 = m_info[ii][0];
if (!info0.valid
|| info0.width != first.width || info0.height != first.height
|| info0.internalFormat != first.internalFormat || info0.type != first.type) {
m_isComplete = false;
break;
}
int width = info0.width;
int height = info0.height;
for (int level = 1; level < levelCount; ++level) {
width = std::max(1, width >> 1);
height = std::max(1, height >> 1);
const LevelInfo& info = m_info[ii][level];
if (!info.valid
|| info.width != width || info.height != height
|| info.internalFormat != info0.internalFormat || info.type != info0.type) {
m_isComplete = false;
break;
}
}
}
}
m_needToUseBlackTexture = false;
// NPOT
if (m_isNPOT && ((m_minFilter != GraphicsContext3D::NEAREST && m_minFilter != GraphicsContext3D::LINEAR)
|| m_wrapS != GraphicsContext3D::CLAMP_TO_EDGE || m_wrapT != GraphicsContext3D::CLAMP_TO_EDGE))
m_needToUseBlackTexture = true;
// Completeness
if (!m_isComplete && m_minFilter != GraphicsContext3D::NEAREST && m_minFilter != GraphicsContext3D::LINEAR)
m_needToUseBlackTexture = true;
}
void WebGLTexture::updateNPOTStates()
{
int numTargets = 0;
if (m_target == GraphicsContext3D::TEXTURE_2D)
numTargets = 1;
else if (m_target == GraphicsContext3D::TEXTURE_CUBE_MAP)
numTargets = 6;
m_isNPOT = false;
unsigned w0 = m_width[0], h0 = m_height[0];
for (int ii = 0; ii < numTargets; ++ii) {
if (ii && (!m_width[ii] || !m_height[ii] || m_width[ii] != w0 || m_height[ii] != h0)) {
// We only set NPOT for complete cube map textures.
m_isNPOT = false;
break;
}
if (isNPOT(m_width[ii], m_height[ii]))
m_isNPOT = true;
}
m_needToUseBlackTexture = false;
if (m_isNPOT && ((m_minFilter != GraphicsContext3D::NEAREST && m_minFilter != GraphicsContext3D::LINEAR)
|| m_wrapS != GraphicsContext3D::CLAMP_TO_EDGE || m_wrapT != GraphicsContext3D::CLAMP_TO_EDGE))
m_needToUseBlackTexture = true;
}
