//----------------------------------------------------------------------------//
void GLES2Texture::blitToMemory(void* targetData)
{
/* OpenGL ES 3.1 or below doesn't support
"glGetTexImage"/"glGetCompressedTexImage", so we need to emulate it
using "glReadPixels". */
GLint old_pack;
glGetIntegerv(GL_PACK_ALIGNMENT, &old_pack);
GLuint texture_framebuffer(0);
GLint framebuffer_old(0), pack_alignment_old(0);
glGenFramebuffers(1, &texture_framebuffer);
GLenum framebuffer_target(0), framebuffer_param(0);
framebuffer_param = GL_READ_FRAMEBUFFER_BINDING;
framebuffer_target = GL_READ_FRAMEBUFFER;
glGetIntegerv(framebuffer_param, &framebuffer_old);
glBindFramebuffer(framebuffer_target, texture_framebuffer);
glFramebufferTexture2D(framebuffer_target, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
d_ogltexture, 0);
GLint read_buffer_old(0), pixel_pack_buffer_old(0);
glGetIntegerv(GL_READ_BUFFER, &read_buffer_old);
glReadBuffer(GL_COLOR_ATTACHMENT0);
glGetIntegerv(GL_PIXEL_PACK_BUFFER_BINDING, &pixel_pack_buffer_old);
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
glGetIntegerv(GL_PACK_ALIGNMENT, &pack_alignment_old);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, static_cast<GLsizei>(d_dataSize.d_width),
static_cast<GLsizei>(d_dataSize.d_height), GL_RGBA, GL_UNSIGNED_BYTE,
targetData);
glPixelStorei(GL_PACK_ALIGNMENT, pack_alignment_old);
glBindBuffer(GL_PIXEL_PACK_BUFFER, pixel_pack_buffer_old);
glReadBuffer(read_buffer_old);
glBindFramebuffer(framebuffer_target, framebuffer_old);
glDeleteFramebuffers(1, &texture_framebuffer);
}
//----------------------------------------------------------------------------//
void OpenGL1Texture::blitToMemory(void* targetData)
{
if (OpenGLInfo::getSingleton().isUsingOpenglEs())
{
/* OpenGL ES 3.1 or below doesn't support
"glGetTexImage"/"glGetCompressedTexImage", so we need to emulate it
using "glReadPixels". */
GLint old_pack;
glGetIntegerv(GL_PACK_ALIGNMENT, &old_pack);
GLuint texture_framebuffer(0);
GLint framebuffer_old(0), pack_alignment_old(0);
glGenFramebuffers(1, &texture_framebuffer);
GLenum framebuffer_target(0), framebuffer_param(0);
if (OpenGLInfo::getSingleton()
.isSeperateReadAndDrawFramebufferSupported())
{
framebuffer_param = GL_READ_FRAMEBUFFER_BINDING;
framebuffer_target = GL_READ_FRAMEBUFFER;
}
else
{
framebuffer_param = GL_FRAMEBUFFER_BINDING;
framebuffer_target = GL_FRAMEBUFFER;
}
glGetIntegerv(framebuffer_param, &framebuffer_old);
glBindFramebuffer(framebuffer_target, texture_framebuffer);
glFramebufferTexture2D(framebuffer_target, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, d_ogltexture, 0);
GLint read_buffer_old(0), pixel_pack_buffer_old(0);
if (OpenGLInfo::getSingleton().isReadBufferSupported())
{
glGetIntegerv(GL_READ_BUFFER, &read_buffer_old);
glReadBuffer(GL_COLOR_ATTACHMENT0);
glGetIntegerv(GL_PIXEL_PACK_BUFFER_BINDING, &pixel_pack_buffer_old);
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
}
glGetIntegerv(GL_PACK_ALIGNMENT, &pack_alignment_old);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, static_cast<GLsizei>(d_dataSize.d_width),
static_cast<GLsizei>(d_dataSize.d_height), GL_RGBA, GL_UNSIGNED_BYTE, targetData);
glPixelStorei(GL_PACK_ALIGNMENT, pack_alignment_old);
if (OpenGLInfo::getSingleton().isReadBufferSupported())
{
glBindBuffer(GL_PIXEL_PACK_BUFFER, pixel_pack_buffer_old);
glReadBuffer(read_buffer_old);
}
glBindFramebuffer(framebuffer_target, framebuffer_old);
glDeleteFramebuffers(1, &texture_framebuffer);
}
else // Desktop OpenGL
{
// save existing config
GLuint old_tex;
glGetIntegerv(GL_TEXTURE_BINDING_2D, reinterpret_cast<GLint*>(&old_tex));
glBindTexture(GL_TEXTURE_2D, d_ogltexture);
if (d_isCompressed)
{
glGetCompressedTexImage(GL_TEXTURE_2D, 0, targetData);
}
else
{
GLint old_pack;
glGetIntegerv(GL_PACK_ALIGNMENT, &old_pack);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glGetTexImage(GL_TEXTURE_2D, 0, d_format, d_subpixelFormat, targetData);
glPixelStorei(GL_PACK_ALIGNMENT, old_pack);
}
// restore previous config.
glBindTexture(GL_TEXTURE_2D, old_tex);
}
}