//[-------------------------------------------------------]
//[ Public methods ]
//[-------------------------------------------------------]
TextureBufferDsa::TextureBufferDsa(OpenGLRenderer &openGLRenderer, uint32_t numberOfBytes, Renderer::TextureFormat::Enum textureFormat, const void *data, Renderer::BufferUsage bufferUsage) :
TextureBuffer(openGLRenderer)
{
if (openGLRenderer.getExtensions().isGL_ARB_direct_state_access())
{
{ // Buffer part
// Create the OpenGL texture buffer
glCreateBuffers(1, &mOpenGLTextureBuffer);
// Upload the data
// -> Usage: These constants directly map to "GL_ARB_vertex_buffer_object" and OpenGL ES 2 constants, do not change them
glNamedBufferData(mOpenGLTextureBuffer, static_cast<GLsizeiptr>(numberOfBytes), data, static_cast<GLenum>(bufferUsage));
}
{ // Texture part
// Create the OpenGL texture instance
glCreateTextures(GL_TEXTURE_BUFFER_ARB, 1, &mOpenGLTexture);
// Attach the storage for the buffer object to the buffer texture
glTextureBuffer(mOpenGLTexture, Mapping::getOpenGLInternalFormat(textureFormat), mOpenGLTextureBuffer);
}
}
else
{
// Create the OpenGL texture buffer
glGenBuffersARB(1, &mOpenGLTextureBuffer);
// Create the OpenGL texture instance
glGenTextures(1, &mOpenGLTexture);
// Buffer part
// -> Upload the data
// -> Usage: These constants directly map to "GL_ARB_vertex_buffer_object" and OpenGL ES 2 constants, do not change them
glNamedBufferDataEXT(mOpenGLTextureBuffer, static_cast<GLsizeiptr>(numberOfBytes), data, static_cast<GLenum>(bufferUsage));
{ // Texture part
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Backup the currently bound OpenGL texture
GLint openGLTextureBackup = 0;
glGetIntegerv(GL_TEXTURE_BINDING_BUFFER_ARB, &openGLTextureBackup);
#endif
// Make this OpenGL texture instance to the currently used one
glBindTexture(GL_TEXTURE_BUFFER_ARB, mOpenGLTexture);
// Attaches the storage for the buffer object to the active buffer texture
// -> Sadly, there's no direct state access (DSA) function defined for this in "GL_EXT_direct_state_access"
glTexBufferARB(GL_TEXTURE_BUFFER_ARB, Mapping::getOpenGLInternalFormat(textureFormat), mOpenGLTextureBuffer);
#ifndef OPENGLRENDERER_NO_STATE_CLEANUP
// Be polite and restore the previous bound OpenGL texture
glBindTexture(GL_TEXTURE_BUFFER_ARB, static_cast<GLuint>(openGLTextureBackup));
#endif
}
}
}
void bind(
InternalFormat internalformat,
gl::NamedBuffer buffer
){
glTextureBuffer(
texture_,
GLenum(internalformat),
GLuint(buffer)
);
}
void BufferTexture::setBufferImplementationDSA(const BufferTextureFormat internalFormat, Buffer& buffer) {
glTextureBuffer(id(), GLenum(internalFormat), buffer.id());
}