Texture::Texture(int width, int height, GLuint target, int flag)
: target(target)
{
extractParams(flag);
genTexture();
glTexImage2D(target, 0, internalFormat, width, height, 0, format, type, NULL);
texParameter(GL_TEXTURE_MAG_FILTER, magFilter);
texParameter(GL_TEXTURE_MIN_FILTER, minFilter);
}
GLuint loadTextureFromPNGData(png_byte* image_data, int &width, int &height)
{
if (image_data == NULL) LOGE("loadTextureFromPNGData:Image data == NULL");
GLuint texture = genTexture();
bindTexture2D(texture);
texImage2D(width, height, static_cast<GLvoid*>(image_data));
texParameter(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
texParameter(GL_TEXTURE_MAG_FILTER, GL_NEAREST);
return texture;
}
Texture::Texture(const char *filename, GLuint target, int flag)
: name(filename), target(target)
{
flag |= UNSIGNED_BYTE|RGB; //RGB avoid an exception in extractParams
extractParams(flag);
genTexture();
if(target == TEXTURE_CUBE_MAP)
loadCubemap(flag);
else if(target == TEXTURE_2D)
loadTexture2D(name, target, flag);
texParameter(GL_TEXTURE_MAG_FILTER, magFilter);
texParameter(GL_TEXTURE_MIN_FILTER, minFilter);
}
GLuint loadTextureFromPNG(const ResourcePtr& pngData, int &width, int &height)
{
//Now generate the OpenGL texture object
GLuint texture = genTexture();
bindTexture2D(texture);
png_byte* image_data = loadImageFromPNG(pngData, width, height);
// got this logic from android_source/frameworks/base/cmds/bootanimation/BootAnimation.cpp,
// but it doesn't seem to work right. The odd-sized texture loads, but it is squished. I could probably fix
// that, but I'm not going to worry about it for now.
// int tw = 1 << (31 - __builtin_clz(width));
// int th = 1 << (31 - __builtin_clz(height));
// if (tw < width) tw <<= 1;
// if (th < height) th <<= 1;
//
// if (tw != width || th != height)
// {
// GLint crop[4] = { 0, height, width, -height };
// texImage2D(tw, th, 0);
// glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, static_cast<GLvoid*>(image_data));
// checkGLError("glTexSubImage2D");
// glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, crop);
// checkGLError("glTexParameteriv");
// }
// else
// {
texImage2D(width, height, static_cast<GLvoid*>(image_data));
// }
texParameter(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
texParameter(GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// I thought these might help with random black pixels on the edge of a rotated texture, but they didn't.
// texParameter(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
// texParameter(GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
//clean up memory and close stuff
//png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
//delete[] image_data;
//delete[] row_pointers;
delete[] image_data;
return texture;
}
GLuint loadTextureFromPKM(const ResourcePtr& pkmData, int &width, int &height)
{
#ifdef GL_ETC1_RGB8_OES
const unsigned ETC_PKM_HEADER_SIZE = 16;
if (pkmData->data().size() <= ETC_PKM_HEADER_SIZE)
{
LOGE("pkmData is not the right size. expected > %u, is: %zu", ETC_PKM_HEADER_SIZE, pkmData->data().size());
return TEXTURE_LOAD_ERROR;
}
etc1_byte* header = &pkmData->data()[0];
if (!etc1_pkm_is_valid(header))
return TEXTURE_LOAD_ERROR;
width = etc1_pkm_get_width(header);
height = etc1_pkm_get_height(header);
size_t encodedDataSize = etc1_get_encoded_data_size(width, height);
if (pkmData->data().size() != ETC_PKM_HEADER_SIZE + encodedDataSize)
{
LOGE("pkmData is not the right size. expected: %zu, is: %zu", ETC_PKM_HEADER_SIZE + encodedDataSize, pkmData->data().size());
return TEXTURE_LOAD_ERROR;
}
//Now generate the OpenGL texture object
GLuint texture = genTexture();
bindTexture2D(texture);
compressedTexImage2D(GL_ETC1_RGB8_OES, width, height, encodedDataSize, static_cast<GLvoid*> (&pkmData->data()[ETC_PKM_HEADER_SIZE]));
texParameter(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
texParameter(GL_TEXTURE_MAG_FILTER, GL_NEAREST);
return texture;
#else
LOGE("PKM texture format not supported by this platform");
return TEXTURE_LOAD_ERROR;
#endif
}
